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0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <dirent.h>
0003 #include <errno.h>
0004 #include <stdlib.h>
0005 #include <stdio.h>
0006 #include <string.h>
0007 #include <linux/capability.h>
0008 #include <linux/kernel.h>
0009 #include <linux/mman.h>
0010 #include <linux/string.h>
0011 #include <linux/time64.h>
0012 #include <sys/types.h>
0013 #include <sys/stat.h>
0014 #include <sys/param.h>
0015 #include <fcntl.h>
0016 #include <unistd.h>
0017 #include <inttypes.h>
0018 #include "annotate.h"
0019 #include "build-id.h"
0020 #include "cap.h"
0021 #include "dso.h"
0022 #include "util.h" // lsdir()
0023 #include "debug.h"
0024 #include "event.h"
0025 #include "machine.h"
0026 #include "map.h"
0027 #include "symbol.h"
0028 #include "map_symbol.h"
0029 #include "mem-events.h"
0030 #include "symsrc.h"
0031 #include "strlist.h"
0032 #include "intlist.h"
0033 #include "namespaces.h"
0034 #include "header.h"
0035 #include "path.h"
0036 #include <linux/ctype.h>
0037 #include <linux/zalloc.h>
0038 
0039 #include <elf.h>
0040 #include <limits.h>
0041 #include <symbol/kallsyms.h>
0042 #include <sys/utsname.h>
0043 
0044 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
0045 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
0046 static bool symbol__is_idle(const char *name);
0047 
0048 int vmlinux_path__nr_entries;
0049 char **vmlinux_path;
0050 
0051 struct symbol_conf symbol_conf = {
0052     .nanosecs       = false,
0053     .use_modules        = true,
0054     .try_vmlinux_path   = true,
0055     .demangle       = true,
0056     .demangle_kernel    = false,
0057     .cumulate_callchain = true,
0058     .time_quantum       = 100 * NSEC_PER_MSEC, /* 100ms */
0059     .show_hist_headers  = true,
0060     .symfs          = "",
0061     .event_group        = true,
0062     .inline_name        = true,
0063     .res_sample     = 0,
0064 };
0065 
0066 static enum dso_binary_type binary_type_symtab[] = {
0067     DSO_BINARY_TYPE__KALLSYMS,
0068     DSO_BINARY_TYPE__GUEST_KALLSYMS,
0069     DSO_BINARY_TYPE__JAVA_JIT,
0070     DSO_BINARY_TYPE__DEBUGLINK,
0071     DSO_BINARY_TYPE__BUILD_ID_CACHE,
0072     DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
0073     DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
0074     DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
0075     DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
0076     DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
0077     DSO_BINARY_TYPE__GUEST_KMODULE,
0078     DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
0079     DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
0080     DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
0081     DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
0082     DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
0083     DSO_BINARY_TYPE__NOT_FOUND,
0084 };
0085 
0086 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
0087 
0088 static bool symbol_type__filter(char symbol_type)
0089 {
0090     symbol_type = toupper(symbol_type);
0091     return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
0092 }
0093 
0094 static int prefix_underscores_count(const char *str)
0095 {
0096     const char *tail = str;
0097 
0098     while (*tail == '_')
0099         tail++;
0100 
0101     return tail - str;
0102 }
0103 
0104 const char * __weak arch__normalize_symbol_name(const char *name)
0105 {
0106     return name;
0107 }
0108 
0109 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
0110 {
0111     return strcmp(namea, nameb);
0112 }
0113 
0114 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
0115                     unsigned int n)
0116 {
0117     return strncmp(namea, nameb, n);
0118 }
0119 
0120 int __weak arch__choose_best_symbol(struct symbol *syma,
0121                     struct symbol *symb __maybe_unused)
0122 {
0123     /* Avoid "SyS" kernel syscall aliases */
0124     if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
0125         return SYMBOL_B;
0126     if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
0127         return SYMBOL_B;
0128 
0129     return SYMBOL_A;
0130 }
0131 
0132 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
0133 {
0134     s64 a;
0135     s64 b;
0136     size_t na, nb;
0137 
0138     /* Prefer a symbol with non zero length */
0139     a = syma->end - syma->start;
0140     b = symb->end - symb->start;
0141     if ((b == 0) && (a > 0))
0142         return SYMBOL_A;
0143     else if ((a == 0) && (b > 0))
0144         return SYMBOL_B;
0145 
0146     /* Prefer a non weak symbol over a weak one */
0147     a = syma->binding == STB_WEAK;
0148     b = symb->binding == STB_WEAK;
0149     if (b && !a)
0150         return SYMBOL_A;
0151     if (a && !b)
0152         return SYMBOL_B;
0153 
0154     /* Prefer a global symbol over a non global one */
0155     a = syma->binding == STB_GLOBAL;
0156     b = symb->binding == STB_GLOBAL;
0157     if (a && !b)
0158         return SYMBOL_A;
0159     if (b && !a)
0160         return SYMBOL_B;
0161 
0162     /* Prefer a symbol with less underscores */
0163     a = prefix_underscores_count(syma->name);
0164     b = prefix_underscores_count(symb->name);
0165     if (b > a)
0166         return SYMBOL_A;
0167     else if (a > b)
0168         return SYMBOL_B;
0169 
0170     /* Choose the symbol with the longest name */
0171     na = strlen(syma->name);
0172     nb = strlen(symb->name);
0173     if (na > nb)
0174         return SYMBOL_A;
0175     else if (na < nb)
0176         return SYMBOL_B;
0177 
0178     return arch__choose_best_symbol(syma, symb);
0179 }
0180 
0181 void symbols__fixup_duplicate(struct rb_root_cached *symbols)
0182 {
0183     struct rb_node *nd;
0184     struct symbol *curr, *next;
0185 
0186     if (symbol_conf.allow_aliases)
0187         return;
0188 
0189     nd = rb_first_cached(symbols);
0190 
0191     while (nd) {
0192         curr = rb_entry(nd, struct symbol, rb_node);
0193 again:
0194         nd = rb_next(&curr->rb_node);
0195         next = rb_entry(nd, struct symbol, rb_node);
0196 
0197         if (!nd)
0198             break;
0199 
0200         if (curr->start != next->start)
0201             continue;
0202 
0203         if (choose_best_symbol(curr, next) == SYMBOL_A) {
0204             rb_erase_cached(&next->rb_node, symbols);
0205             symbol__delete(next);
0206             goto again;
0207         } else {
0208             nd = rb_next(&curr->rb_node);
0209             rb_erase_cached(&curr->rb_node, symbols);
0210             symbol__delete(curr);
0211         }
0212     }
0213 }
0214 
0215 /* Update zero-sized symbols using the address of the next symbol */
0216 void symbols__fixup_end(struct rb_root_cached *symbols, bool is_kallsyms)
0217 {
0218     struct rb_node *nd, *prevnd = rb_first_cached(symbols);
0219     struct symbol *curr, *prev;
0220 
0221     if (prevnd == NULL)
0222         return;
0223 
0224     curr = rb_entry(prevnd, struct symbol, rb_node);
0225 
0226     for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
0227         prev = curr;
0228         curr = rb_entry(nd, struct symbol, rb_node);
0229 
0230         /*
0231          * On some architecture kernel text segment start is located at
0232          * some low memory address, while modules are located at high
0233          * memory addresses (or vice versa).  The gap between end of
0234          * kernel text segment and beginning of first module's text
0235          * segment is very big.  Therefore do not fill this gap and do
0236          * not assign it to the kernel dso map (kallsyms).
0237          *
0238          * In kallsyms, it determines module symbols using '[' character
0239          * like in:
0240          *   ffffffffc1937000 T hdmi_driver_init  [snd_hda_codec_hdmi]
0241          */
0242         if (prev->end == prev->start) {
0243             /* Last kernel/module symbol mapped to end of page */
0244             if (is_kallsyms && (!strchr(prev->name, '[') !=
0245                         !strchr(curr->name, '[')))
0246                 prev->end = roundup(prev->end + 4096, 4096);
0247             else
0248                 prev->end = curr->start;
0249 
0250             pr_debug4("%s sym:%s end:%#" PRIx64 "\n",
0251                   __func__, prev->name, prev->end);
0252         }
0253     }
0254 
0255     /* Last entry */
0256     if (curr->end == curr->start)
0257         curr->end = roundup(curr->start, 4096) + 4096;
0258 }
0259 
0260 void maps__fixup_end(struct maps *maps)
0261 {
0262     struct map *prev = NULL, *curr;
0263 
0264     down_write(&maps->lock);
0265 
0266     maps__for_each_entry(maps, curr) {
0267         if (prev != NULL && !prev->end)
0268             prev->end = curr->start;
0269 
0270         prev = curr;
0271     }
0272 
0273     /*
0274      * We still haven't the actual symbols, so guess the
0275      * last map final address.
0276      */
0277     if (curr && !curr->end)
0278         curr->end = ~0ULL;
0279 
0280     up_write(&maps->lock);
0281 }
0282 
0283 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
0284 {
0285     size_t namelen = strlen(name) + 1;
0286     struct symbol *sym = calloc(1, (symbol_conf.priv_size +
0287                     sizeof(*sym) + namelen));
0288     if (sym == NULL)
0289         return NULL;
0290 
0291     if (symbol_conf.priv_size) {
0292         if (symbol_conf.init_annotation) {
0293             struct annotation *notes = (void *)sym;
0294             annotation__init(notes);
0295         }
0296         sym = ((void *)sym) + symbol_conf.priv_size;
0297     }
0298 
0299     sym->start   = start;
0300     sym->end     = len ? start + len : start;
0301     sym->type    = type;
0302     sym->binding = binding;
0303     sym->namelen = namelen - 1;
0304 
0305     pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
0306           __func__, name, start, sym->end);
0307     memcpy(sym->name, name, namelen);
0308 
0309     return sym;
0310 }
0311 
0312 void symbol__delete(struct symbol *sym)
0313 {
0314     if (symbol_conf.priv_size) {
0315         if (symbol_conf.init_annotation) {
0316             struct annotation *notes = symbol__annotation(sym);
0317 
0318             annotation__exit(notes);
0319         }
0320     }
0321     free(((void *)sym) - symbol_conf.priv_size);
0322 }
0323 
0324 void symbols__delete(struct rb_root_cached *symbols)
0325 {
0326     struct symbol *pos;
0327     struct rb_node *next = rb_first_cached(symbols);
0328 
0329     while (next) {
0330         pos = rb_entry(next, struct symbol, rb_node);
0331         next = rb_next(&pos->rb_node);
0332         rb_erase_cached(&pos->rb_node, symbols);
0333         symbol__delete(pos);
0334     }
0335 }
0336 
0337 void __symbols__insert(struct rb_root_cached *symbols,
0338                struct symbol *sym, bool kernel)
0339 {
0340     struct rb_node **p = &symbols->rb_root.rb_node;
0341     struct rb_node *parent = NULL;
0342     const u64 ip = sym->start;
0343     struct symbol *s;
0344     bool leftmost = true;
0345 
0346     if (kernel) {
0347         const char *name = sym->name;
0348         /*
0349          * ppc64 uses function descriptors and appends a '.' to the
0350          * start of every instruction address. Remove it.
0351          */
0352         if (name[0] == '.')
0353             name++;
0354         sym->idle = symbol__is_idle(name);
0355     }
0356 
0357     while (*p != NULL) {
0358         parent = *p;
0359         s = rb_entry(parent, struct symbol, rb_node);
0360         if (ip < s->start)
0361             p = &(*p)->rb_left;
0362         else {
0363             p = &(*p)->rb_right;
0364             leftmost = false;
0365         }
0366     }
0367     rb_link_node(&sym->rb_node, parent, p);
0368     rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
0369 }
0370 
0371 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
0372 {
0373     __symbols__insert(symbols, sym, false);
0374 }
0375 
0376 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
0377 {
0378     struct rb_node *n;
0379 
0380     if (symbols == NULL)
0381         return NULL;
0382 
0383     n = symbols->rb_root.rb_node;
0384 
0385     while (n) {
0386         struct symbol *s = rb_entry(n, struct symbol, rb_node);
0387 
0388         if (ip < s->start)
0389             n = n->rb_left;
0390         else if (ip > s->end || (ip == s->end && ip != s->start))
0391             n = n->rb_right;
0392         else
0393             return s;
0394     }
0395 
0396     return NULL;
0397 }
0398 
0399 static struct symbol *symbols__first(struct rb_root_cached *symbols)
0400 {
0401     struct rb_node *n = rb_first_cached(symbols);
0402 
0403     if (n)
0404         return rb_entry(n, struct symbol, rb_node);
0405 
0406     return NULL;
0407 }
0408 
0409 static struct symbol *symbols__last(struct rb_root_cached *symbols)
0410 {
0411     struct rb_node *n = rb_last(&symbols->rb_root);
0412 
0413     if (n)
0414         return rb_entry(n, struct symbol, rb_node);
0415 
0416     return NULL;
0417 }
0418 
0419 static struct symbol *symbols__next(struct symbol *sym)
0420 {
0421     struct rb_node *n = rb_next(&sym->rb_node);
0422 
0423     if (n)
0424         return rb_entry(n, struct symbol, rb_node);
0425 
0426     return NULL;
0427 }
0428 
0429 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
0430 {
0431     struct rb_node **p = &symbols->rb_root.rb_node;
0432     struct rb_node *parent = NULL;
0433     struct symbol_name_rb_node *symn, *s;
0434     bool leftmost = true;
0435 
0436     symn = container_of(sym, struct symbol_name_rb_node, sym);
0437 
0438     while (*p != NULL) {
0439         parent = *p;
0440         s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
0441         if (strcmp(sym->name, s->sym.name) < 0)
0442             p = &(*p)->rb_left;
0443         else {
0444             p = &(*p)->rb_right;
0445             leftmost = false;
0446         }
0447     }
0448     rb_link_node(&symn->rb_node, parent, p);
0449     rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
0450 }
0451 
0452 static void symbols__sort_by_name(struct rb_root_cached *symbols,
0453                   struct rb_root_cached *source)
0454 {
0455     struct rb_node *nd;
0456 
0457     for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
0458         struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
0459         symbols__insert_by_name(symbols, pos);
0460     }
0461 }
0462 
0463 int symbol__match_symbol_name(const char *name, const char *str,
0464                   enum symbol_tag_include includes)
0465 {
0466     const char *versioning;
0467 
0468     if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
0469         (versioning = strstr(name, "@@"))) {
0470         int len = strlen(str);
0471 
0472         if (len < versioning - name)
0473             len = versioning - name;
0474 
0475         return arch__compare_symbol_names_n(name, str, len);
0476     } else
0477         return arch__compare_symbol_names(name, str);
0478 }
0479 
0480 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
0481                         const char *name,
0482                         enum symbol_tag_include includes)
0483 {
0484     struct rb_node *n;
0485     struct symbol_name_rb_node *s = NULL;
0486 
0487     if (symbols == NULL)
0488         return NULL;
0489 
0490     n = symbols->rb_root.rb_node;
0491 
0492     while (n) {
0493         int cmp;
0494 
0495         s = rb_entry(n, struct symbol_name_rb_node, rb_node);
0496         cmp = symbol__match_symbol_name(s->sym.name, name, includes);
0497 
0498         if (cmp > 0)
0499             n = n->rb_left;
0500         else if (cmp < 0)
0501             n = n->rb_right;
0502         else
0503             break;
0504     }
0505 
0506     if (n == NULL)
0507         return NULL;
0508 
0509     if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
0510         /* return first symbol that has same name (if any) */
0511         for (n = rb_prev(n); n; n = rb_prev(n)) {
0512             struct symbol_name_rb_node *tmp;
0513 
0514             tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
0515             if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
0516                 break;
0517 
0518             s = tmp;
0519         }
0520 
0521     return &s->sym;
0522 }
0523 
0524 void dso__reset_find_symbol_cache(struct dso *dso)
0525 {
0526     dso->last_find_result.addr   = 0;
0527     dso->last_find_result.symbol = NULL;
0528 }
0529 
0530 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
0531 {
0532     __symbols__insert(&dso->symbols, sym, dso->kernel);
0533 
0534     /* update the symbol cache if necessary */
0535     if (dso->last_find_result.addr >= sym->start &&
0536         (dso->last_find_result.addr < sym->end ||
0537         sym->start == sym->end)) {
0538         dso->last_find_result.symbol = sym;
0539     }
0540 }
0541 
0542 void dso__delete_symbol(struct dso *dso, struct symbol *sym)
0543 {
0544     rb_erase_cached(&sym->rb_node, &dso->symbols);
0545     symbol__delete(sym);
0546     dso__reset_find_symbol_cache(dso);
0547 }
0548 
0549 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
0550 {
0551     if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
0552         dso->last_find_result.addr   = addr;
0553         dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
0554     }
0555 
0556     return dso->last_find_result.symbol;
0557 }
0558 
0559 struct symbol *dso__first_symbol(struct dso *dso)
0560 {
0561     return symbols__first(&dso->symbols);
0562 }
0563 
0564 struct symbol *dso__last_symbol(struct dso *dso)
0565 {
0566     return symbols__last(&dso->symbols);
0567 }
0568 
0569 struct symbol *dso__next_symbol(struct symbol *sym)
0570 {
0571     return symbols__next(sym);
0572 }
0573 
0574 struct symbol *symbol__next_by_name(struct symbol *sym)
0575 {
0576     struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
0577     struct rb_node *n = rb_next(&s->rb_node);
0578 
0579     return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
0580 }
0581 
0582  /*
0583   * Returns first symbol that matched with @name.
0584   */
0585 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
0586 {
0587     struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
0588                          SYMBOL_TAG_INCLUDE__NONE);
0589     if (!s)
0590         s = symbols__find_by_name(&dso->symbol_names, name,
0591                       SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
0592     return s;
0593 }
0594 
0595 void dso__sort_by_name(struct dso *dso)
0596 {
0597     dso__set_sorted_by_name(dso);
0598     return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
0599 }
0600 
0601 /*
0602  * While we find nice hex chars, build a long_val.
0603  * Return number of chars processed.
0604  */
0605 static int hex2u64(const char *ptr, u64 *long_val)
0606 {
0607     char *p;
0608 
0609     *long_val = strtoull(ptr, &p, 16);
0610 
0611     return p - ptr;
0612 }
0613 
0614 
0615 int modules__parse(const char *filename, void *arg,
0616            int (*process_module)(void *arg, const char *name,
0617                      u64 start, u64 size))
0618 {
0619     char *line = NULL;
0620     size_t n;
0621     FILE *file;
0622     int err = 0;
0623 
0624     file = fopen(filename, "r");
0625     if (file == NULL)
0626         return -1;
0627 
0628     while (1) {
0629         char name[PATH_MAX];
0630         u64 start, size;
0631         char *sep, *endptr;
0632         ssize_t line_len;
0633 
0634         line_len = getline(&line, &n, file);
0635         if (line_len < 0) {
0636             if (feof(file))
0637                 break;
0638             err = -1;
0639             goto out;
0640         }
0641 
0642         if (!line) {
0643             err = -1;
0644             goto out;
0645         }
0646 
0647         line[--line_len] = '\0'; /* \n */
0648 
0649         sep = strrchr(line, 'x');
0650         if (sep == NULL)
0651             continue;
0652 
0653         hex2u64(sep + 1, &start);
0654 
0655         sep = strchr(line, ' ');
0656         if (sep == NULL)
0657             continue;
0658 
0659         *sep = '\0';
0660 
0661         scnprintf(name, sizeof(name), "[%s]", line);
0662 
0663         size = strtoul(sep + 1, &endptr, 0);
0664         if (*endptr != ' ' && *endptr != '\t')
0665             continue;
0666 
0667         err = process_module(arg, name, start, size);
0668         if (err)
0669             break;
0670     }
0671 out:
0672     free(line);
0673     fclose(file);
0674     return err;
0675 }
0676 
0677 /*
0678  * These are symbols in the kernel image, so make sure that
0679  * sym is from a kernel DSO.
0680  */
0681 static bool symbol__is_idle(const char *name)
0682 {
0683     const char * const idle_symbols[] = {
0684         "acpi_idle_do_entry",
0685         "acpi_processor_ffh_cstate_enter",
0686         "arch_cpu_idle",
0687         "cpu_idle",
0688         "cpu_startup_entry",
0689         "idle_cpu",
0690         "intel_idle",
0691         "default_idle",
0692         "native_safe_halt",
0693         "enter_idle",
0694         "exit_idle",
0695         "mwait_idle",
0696         "mwait_idle_with_hints",
0697         "mwait_idle_with_hints.constprop.0",
0698         "poll_idle",
0699         "ppc64_runlatch_off",
0700         "pseries_dedicated_idle_sleep",
0701         "psw_idle",
0702         "psw_idle_exit",
0703         NULL
0704     };
0705     int i;
0706     static struct strlist *idle_symbols_list;
0707 
0708     if (idle_symbols_list)
0709         return strlist__has_entry(idle_symbols_list, name);
0710 
0711     idle_symbols_list = strlist__new(NULL, NULL);
0712 
0713     for (i = 0; idle_symbols[i]; i++)
0714         strlist__add(idle_symbols_list, idle_symbols[i]);
0715 
0716     return strlist__has_entry(idle_symbols_list, name);
0717 }
0718 
0719 static int map__process_kallsym_symbol(void *arg, const char *name,
0720                        char type, u64 start)
0721 {
0722     struct symbol *sym;
0723     struct dso *dso = arg;
0724     struct rb_root_cached *root = &dso->symbols;
0725 
0726     if (!symbol_type__filter(type))
0727         return 0;
0728 
0729     /* Ignore local symbols for ARM modules */
0730     if (name[0] == '$')
0731         return 0;
0732 
0733     /*
0734      * module symbols are not sorted so we add all
0735      * symbols, setting length to 0, and rely on
0736      * symbols__fixup_end() to fix it up.
0737      */
0738     sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
0739     if (sym == NULL)
0740         return -ENOMEM;
0741     /*
0742      * We will pass the symbols to the filter later, in
0743      * map__split_kallsyms, when we have split the maps per module
0744      */
0745     __symbols__insert(root, sym, !strchr(name, '['));
0746 
0747     return 0;
0748 }
0749 
0750 /*
0751  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
0752  * so that we can in the next step set the symbol ->end address and then
0753  * call kernel_maps__split_kallsyms.
0754  */
0755 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
0756 {
0757     return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
0758 }
0759 
0760 static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso)
0761 {
0762     struct map *curr_map;
0763     struct symbol *pos;
0764     int count = 0;
0765     struct rb_root_cached old_root = dso->symbols;
0766     struct rb_root_cached *root = &dso->symbols;
0767     struct rb_node *next = rb_first_cached(root);
0768 
0769     if (!kmaps)
0770         return -1;
0771 
0772     *root = RB_ROOT_CACHED;
0773 
0774     while (next) {
0775         char *module;
0776 
0777         pos = rb_entry(next, struct symbol, rb_node);
0778         next = rb_next(&pos->rb_node);
0779 
0780         rb_erase_cached(&pos->rb_node, &old_root);
0781         RB_CLEAR_NODE(&pos->rb_node);
0782         module = strchr(pos->name, '\t');
0783         if (module)
0784             *module = '\0';
0785 
0786         curr_map = maps__find(kmaps, pos->start);
0787 
0788         if (!curr_map) {
0789             symbol__delete(pos);
0790             continue;
0791         }
0792 
0793         pos->start -= curr_map->start - curr_map->pgoff;
0794         if (pos->end > curr_map->end)
0795             pos->end = curr_map->end;
0796         if (pos->end)
0797             pos->end -= curr_map->start - curr_map->pgoff;
0798         symbols__insert(&curr_map->dso->symbols, pos);
0799         ++count;
0800     }
0801 
0802     /* Symbols have been adjusted */
0803     dso->adjust_symbols = 1;
0804 
0805     return count;
0806 }
0807 
0808 /*
0809  * Split the symbols into maps, making sure there are no overlaps, i.e. the
0810  * kernel range is broken in several maps, named [kernel].N, as we don't have
0811  * the original ELF section names vmlinux have.
0812  */
0813 static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
0814                 struct map *initial_map)
0815 {
0816     struct machine *machine;
0817     struct map *curr_map = initial_map;
0818     struct symbol *pos;
0819     int count = 0, moved = 0;
0820     struct rb_root_cached *root = &dso->symbols;
0821     struct rb_node *next = rb_first_cached(root);
0822     int kernel_range = 0;
0823     bool x86_64;
0824 
0825     if (!kmaps)
0826         return -1;
0827 
0828     machine = kmaps->machine;
0829 
0830     x86_64 = machine__is(machine, "x86_64");
0831 
0832     while (next) {
0833         char *module;
0834 
0835         pos = rb_entry(next, struct symbol, rb_node);
0836         next = rb_next(&pos->rb_node);
0837 
0838         module = strchr(pos->name, '\t');
0839         if (module) {
0840             if (!symbol_conf.use_modules)
0841                 goto discard_symbol;
0842 
0843             *module++ = '\0';
0844 
0845             if (strcmp(curr_map->dso->short_name, module)) {
0846                 if (curr_map != initial_map &&
0847                     dso->kernel == DSO_SPACE__KERNEL_GUEST &&
0848                     machine__is_default_guest(machine)) {
0849                     /*
0850                      * We assume all symbols of a module are
0851                      * continuous in * kallsyms, so curr_map
0852                      * points to a module and all its
0853                      * symbols are in its kmap. Mark it as
0854                      * loaded.
0855                      */
0856                     dso__set_loaded(curr_map->dso);
0857                 }
0858 
0859                 curr_map = maps__find_by_name(kmaps, module);
0860                 if (curr_map == NULL) {
0861                     pr_debug("%s/proc/{kallsyms,modules} "
0862                              "inconsistency while looking "
0863                          "for \"%s\" module!\n",
0864                          machine->root_dir, module);
0865                     curr_map = initial_map;
0866                     goto discard_symbol;
0867                 }
0868 
0869                 if (curr_map->dso->loaded &&
0870                     !machine__is_default_guest(machine))
0871                     goto discard_symbol;
0872             }
0873             /*
0874              * So that we look just like we get from .ko files,
0875              * i.e. not prelinked, relative to initial_map->start.
0876              */
0877             pos->start = curr_map->map_ip(curr_map, pos->start);
0878             pos->end   = curr_map->map_ip(curr_map, pos->end);
0879         } else if (x86_64 && is_entry_trampoline(pos->name)) {
0880             /*
0881              * These symbols are not needed anymore since the
0882              * trampoline maps refer to the text section and it's
0883              * symbols instead. Avoid having to deal with
0884              * relocations, and the assumption that the first symbol
0885              * is the start of kernel text, by simply removing the
0886              * symbols at this point.
0887              */
0888             goto discard_symbol;
0889         } else if (curr_map != initial_map) {
0890             char dso_name[PATH_MAX];
0891             struct dso *ndso;
0892 
0893             if (delta) {
0894                 /* Kernel was relocated at boot time */
0895                 pos->start -= delta;
0896                 pos->end -= delta;
0897             }
0898 
0899             if (count == 0) {
0900                 curr_map = initial_map;
0901                 goto add_symbol;
0902             }
0903 
0904             if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
0905                 snprintf(dso_name, sizeof(dso_name),
0906                     "[guest.kernel].%d",
0907                     kernel_range++);
0908             else
0909                 snprintf(dso_name, sizeof(dso_name),
0910                     "[kernel].%d",
0911                     kernel_range++);
0912 
0913             ndso = dso__new(dso_name);
0914             if (ndso == NULL)
0915                 return -1;
0916 
0917             ndso->kernel = dso->kernel;
0918 
0919             curr_map = map__new2(pos->start, ndso);
0920             if (curr_map == NULL) {
0921                 dso__put(ndso);
0922                 return -1;
0923             }
0924 
0925             curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
0926             maps__insert(kmaps, curr_map);
0927             ++kernel_range;
0928         } else if (delta) {
0929             /* Kernel was relocated at boot time */
0930             pos->start -= delta;
0931             pos->end -= delta;
0932         }
0933 add_symbol:
0934         if (curr_map != initial_map) {
0935             rb_erase_cached(&pos->rb_node, root);
0936             symbols__insert(&curr_map->dso->symbols, pos);
0937             ++moved;
0938         } else
0939             ++count;
0940 
0941         continue;
0942 discard_symbol:
0943         rb_erase_cached(&pos->rb_node, root);
0944         symbol__delete(pos);
0945     }
0946 
0947     if (curr_map != initial_map &&
0948         dso->kernel == DSO_SPACE__KERNEL_GUEST &&
0949         machine__is_default_guest(kmaps->machine)) {
0950         dso__set_loaded(curr_map->dso);
0951     }
0952 
0953     return count + moved;
0954 }
0955 
0956 bool symbol__restricted_filename(const char *filename,
0957                  const char *restricted_filename)
0958 {
0959     bool restricted = false;
0960 
0961     if (symbol_conf.kptr_restrict) {
0962         char *r = realpath(filename, NULL);
0963 
0964         if (r != NULL) {
0965             restricted = strcmp(r, restricted_filename) == 0;
0966             free(r);
0967             return restricted;
0968         }
0969     }
0970 
0971     return restricted;
0972 }
0973 
0974 struct module_info {
0975     struct rb_node rb_node;
0976     char *name;
0977     u64 start;
0978 };
0979 
0980 static void add_module(struct module_info *mi, struct rb_root *modules)
0981 {
0982     struct rb_node **p = &modules->rb_node;
0983     struct rb_node *parent = NULL;
0984     struct module_info *m;
0985 
0986     while (*p != NULL) {
0987         parent = *p;
0988         m = rb_entry(parent, struct module_info, rb_node);
0989         if (strcmp(mi->name, m->name) < 0)
0990             p = &(*p)->rb_left;
0991         else
0992             p = &(*p)->rb_right;
0993     }
0994     rb_link_node(&mi->rb_node, parent, p);
0995     rb_insert_color(&mi->rb_node, modules);
0996 }
0997 
0998 static void delete_modules(struct rb_root *modules)
0999 {
1000     struct module_info *mi;
1001     struct rb_node *next = rb_first(modules);
1002 
1003     while (next) {
1004         mi = rb_entry(next, struct module_info, rb_node);
1005         next = rb_next(&mi->rb_node);
1006         rb_erase(&mi->rb_node, modules);
1007         zfree(&mi->name);
1008         free(mi);
1009     }
1010 }
1011 
1012 static struct module_info *find_module(const char *name,
1013                        struct rb_root *modules)
1014 {
1015     struct rb_node *n = modules->rb_node;
1016 
1017     while (n) {
1018         struct module_info *m;
1019         int cmp;
1020 
1021         m = rb_entry(n, struct module_info, rb_node);
1022         cmp = strcmp(name, m->name);
1023         if (cmp < 0)
1024             n = n->rb_left;
1025         else if (cmp > 0)
1026             n = n->rb_right;
1027         else
1028             return m;
1029     }
1030 
1031     return NULL;
1032 }
1033 
1034 static int __read_proc_modules(void *arg, const char *name, u64 start,
1035                    u64 size __maybe_unused)
1036 {
1037     struct rb_root *modules = arg;
1038     struct module_info *mi;
1039 
1040     mi = zalloc(sizeof(struct module_info));
1041     if (!mi)
1042         return -ENOMEM;
1043 
1044     mi->name = strdup(name);
1045     mi->start = start;
1046 
1047     if (!mi->name) {
1048         free(mi);
1049         return -ENOMEM;
1050     }
1051 
1052     add_module(mi, modules);
1053 
1054     return 0;
1055 }
1056 
1057 static int read_proc_modules(const char *filename, struct rb_root *modules)
1058 {
1059     if (symbol__restricted_filename(filename, "/proc/modules"))
1060         return -1;
1061 
1062     if (modules__parse(filename, modules, __read_proc_modules)) {
1063         delete_modules(modules);
1064         return -1;
1065     }
1066 
1067     return 0;
1068 }
1069 
1070 int compare_proc_modules(const char *from, const char *to)
1071 {
1072     struct rb_root from_modules = RB_ROOT;
1073     struct rb_root to_modules = RB_ROOT;
1074     struct rb_node *from_node, *to_node;
1075     struct module_info *from_m, *to_m;
1076     int ret = -1;
1077 
1078     if (read_proc_modules(from, &from_modules))
1079         return -1;
1080 
1081     if (read_proc_modules(to, &to_modules))
1082         goto out_delete_from;
1083 
1084     from_node = rb_first(&from_modules);
1085     to_node = rb_first(&to_modules);
1086     while (from_node) {
1087         if (!to_node)
1088             break;
1089 
1090         from_m = rb_entry(from_node, struct module_info, rb_node);
1091         to_m = rb_entry(to_node, struct module_info, rb_node);
1092 
1093         if (from_m->start != to_m->start ||
1094             strcmp(from_m->name, to_m->name))
1095             break;
1096 
1097         from_node = rb_next(from_node);
1098         to_node = rb_next(to_node);
1099     }
1100 
1101     if (!from_node && !to_node)
1102         ret = 0;
1103 
1104     delete_modules(&to_modules);
1105 out_delete_from:
1106     delete_modules(&from_modules);
1107 
1108     return ret;
1109 }
1110 
1111 static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
1112 {
1113     struct rb_root modules = RB_ROOT;
1114     struct map *old_map;
1115     int err;
1116 
1117     err = read_proc_modules(filename, &modules);
1118     if (err)
1119         return err;
1120 
1121     maps__for_each_entry(kmaps, old_map) {
1122         struct module_info *mi;
1123 
1124         if (!__map__is_kmodule(old_map)) {
1125             continue;
1126         }
1127 
1128         /* Module must be in memory at the same address */
1129         mi = find_module(old_map->dso->short_name, &modules);
1130         if (!mi || mi->start != old_map->start) {
1131             err = -EINVAL;
1132             goto out;
1133         }
1134     }
1135 out:
1136     delete_modules(&modules);
1137     return err;
1138 }
1139 
1140 /*
1141  * If kallsyms is referenced by name then we look for filename in the same
1142  * directory.
1143  */
1144 static bool filename_from_kallsyms_filename(char *filename,
1145                         const char *base_name,
1146                         const char *kallsyms_filename)
1147 {
1148     char *name;
1149 
1150     strcpy(filename, kallsyms_filename);
1151     name = strrchr(filename, '/');
1152     if (!name)
1153         return false;
1154 
1155     name += 1;
1156 
1157     if (!strcmp(name, "kallsyms")) {
1158         strcpy(name, base_name);
1159         return true;
1160     }
1161 
1162     return false;
1163 }
1164 
1165 static int validate_kcore_modules(const char *kallsyms_filename,
1166                   struct map *map)
1167 {
1168     struct maps *kmaps = map__kmaps(map);
1169     char modules_filename[PATH_MAX];
1170 
1171     if (!kmaps)
1172         return -EINVAL;
1173 
1174     if (!filename_from_kallsyms_filename(modules_filename, "modules",
1175                          kallsyms_filename))
1176         return -EINVAL;
1177 
1178     if (do_validate_kcore_modules(modules_filename, kmaps))
1179         return -EINVAL;
1180 
1181     return 0;
1182 }
1183 
1184 static int validate_kcore_addresses(const char *kallsyms_filename,
1185                     struct map *map)
1186 {
1187     struct kmap *kmap = map__kmap(map);
1188 
1189     if (!kmap)
1190         return -EINVAL;
1191 
1192     if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1193         u64 start;
1194 
1195         if (kallsyms__get_function_start(kallsyms_filename,
1196                          kmap->ref_reloc_sym->name, &start))
1197             return -ENOENT;
1198         if (start != kmap->ref_reloc_sym->addr)
1199             return -EINVAL;
1200     }
1201 
1202     return validate_kcore_modules(kallsyms_filename, map);
1203 }
1204 
1205 struct kcore_mapfn_data {
1206     struct dso *dso;
1207     struct list_head maps;
1208 };
1209 
1210 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1211 {
1212     struct kcore_mapfn_data *md = data;
1213     struct map *map;
1214 
1215     map = map__new2(start, md->dso);
1216     if (map == NULL)
1217         return -ENOMEM;
1218 
1219     map->end = map->start + len;
1220     map->pgoff = pgoff;
1221 
1222     list_add(&map->node, &md->maps);
1223 
1224     return 0;
1225 }
1226 
1227 /*
1228  * Merges map into maps by splitting the new map within the existing map
1229  * regions.
1230  */
1231 int maps__merge_in(struct maps *kmaps, struct map *new_map)
1232 {
1233     struct map *old_map;
1234     LIST_HEAD(merged);
1235 
1236     maps__for_each_entry(kmaps, old_map) {
1237         /* no overload with this one */
1238         if (new_map->end < old_map->start ||
1239             new_map->start >= old_map->end)
1240             continue;
1241 
1242         if (new_map->start < old_map->start) {
1243             /*
1244              * |new......
1245              *       |old....
1246              */
1247             if (new_map->end < old_map->end) {
1248                 /*
1249                  * |new......|     -> |new..|
1250                  *       |old....| ->       |old....|
1251                  */
1252                 new_map->end = old_map->start;
1253             } else {
1254                 /*
1255                  * |new.............| -> |new..|       |new..|
1256                  *       |old....|    ->       |old....|
1257                  */
1258                 struct map *m = map__clone(new_map);
1259 
1260                 if (!m)
1261                     return -ENOMEM;
1262 
1263                 m->end = old_map->start;
1264                 list_add_tail(&m->node, &merged);
1265                 new_map->pgoff += old_map->end - new_map->start;
1266                 new_map->start = old_map->end;
1267             }
1268         } else {
1269             /*
1270              *      |new......
1271              * |old....
1272              */
1273             if (new_map->end < old_map->end) {
1274                 /*
1275                  *      |new..|   -> x
1276                  * |old.........| -> |old.........|
1277                  */
1278                 map__put(new_map);
1279                 new_map = NULL;
1280                 break;
1281             } else {
1282                 /*
1283                  *      |new......| ->         |new...|
1284                  * |old....|        -> |old....|
1285                  */
1286                 new_map->pgoff += old_map->end - new_map->start;
1287                 new_map->start = old_map->end;
1288             }
1289         }
1290     }
1291 
1292     while (!list_empty(&merged)) {
1293         old_map = list_entry(merged.next, struct map, node);
1294         list_del_init(&old_map->node);
1295         maps__insert(kmaps, old_map);
1296         map__put(old_map);
1297     }
1298 
1299     if (new_map) {
1300         maps__insert(kmaps, new_map);
1301         map__put(new_map);
1302     }
1303     return 0;
1304 }
1305 
1306 static int dso__load_kcore(struct dso *dso, struct map *map,
1307                const char *kallsyms_filename)
1308 {
1309     struct maps *kmaps = map__kmaps(map);
1310     struct kcore_mapfn_data md;
1311     struct map *old_map, *new_map, *replacement_map = NULL, *next;
1312     struct machine *machine;
1313     bool is_64_bit;
1314     int err, fd;
1315     char kcore_filename[PATH_MAX];
1316     u64 stext;
1317 
1318     if (!kmaps)
1319         return -EINVAL;
1320 
1321     machine = kmaps->machine;
1322 
1323     /* This function requires that the map is the kernel map */
1324     if (!__map__is_kernel(map))
1325         return -EINVAL;
1326 
1327     if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1328                          kallsyms_filename))
1329         return -EINVAL;
1330 
1331     /* Modules and kernel must be present at their original addresses */
1332     if (validate_kcore_addresses(kallsyms_filename, map))
1333         return -EINVAL;
1334 
1335     md.dso = dso;
1336     INIT_LIST_HEAD(&md.maps);
1337 
1338     fd = open(kcore_filename, O_RDONLY);
1339     if (fd < 0) {
1340         pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1341              kcore_filename);
1342         return -EINVAL;
1343     }
1344 
1345     /* Read new maps into temporary lists */
1346     err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1347                   &is_64_bit);
1348     if (err)
1349         goto out_err;
1350     dso->is_64_bit = is_64_bit;
1351 
1352     if (list_empty(&md.maps)) {
1353         err = -EINVAL;
1354         goto out_err;
1355     }
1356 
1357     /* Remove old maps */
1358     maps__for_each_entry_safe(kmaps, old_map, next) {
1359         /*
1360          * We need to preserve eBPF maps even if they are
1361          * covered by kcore, because we need to access
1362          * eBPF dso for source data.
1363          */
1364         if (old_map != map && !__map__is_bpf_prog(old_map))
1365             maps__remove(kmaps, old_map);
1366     }
1367     machine->trampolines_mapped = false;
1368 
1369     /* Find the kernel map using the '_stext' symbol */
1370     if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1371         list_for_each_entry(new_map, &md.maps, node) {
1372             if (stext >= new_map->start && stext < new_map->end) {
1373                 replacement_map = new_map;
1374                 break;
1375             }
1376         }
1377     }
1378 
1379     if (!replacement_map)
1380         replacement_map = list_entry(md.maps.next, struct map, node);
1381 
1382     /* Add new maps */
1383     while (!list_empty(&md.maps)) {
1384         new_map = list_entry(md.maps.next, struct map, node);
1385         list_del_init(&new_map->node);
1386         if (new_map == replacement_map) {
1387             map->start  = new_map->start;
1388             map->end    = new_map->end;
1389             map->pgoff  = new_map->pgoff;
1390             map->map_ip = new_map->map_ip;
1391             map->unmap_ip   = new_map->unmap_ip;
1392             /* Ensure maps are correctly ordered */
1393             map__get(map);
1394             maps__remove(kmaps, map);
1395             maps__insert(kmaps, map);
1396             map__put(map);
1397             map__put(new_map);
1398         } else {
1399             /*
1400              * Merge kcore map into existing maps,
1401              * and ensure that current maps (eBPF)
1402              * stay intact.
1403              */
1404             if (maps__merge_in(kmaps, new_map))
1405                 goto out_err;
1406         }
1407     }
1408 
1409     if (machine__is(machine, "x86_64")) {
1410         u64 addr;
1411 
1412         /*
1413          * If one of the corresponding symbols is there, assume the
1414          * entry trampoline maps are too.
1415          */
1416         if (!kallsyms__get_function_start(kallsyms_filename,
1417                           ENTRY_TRAMPOLINE_NAME,
1418                           &addr))
1419             machine->trampolines_mapped = true;
1420     }
1421 
1422     /*
1423      * Set the data type and long name so that kcore can be read via
1424      * dso__data_read_addr().
1425      */
1426     if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1427         dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1428     else
1429         dso->binary_type = DSO_BINARY_TYPE__KCORE;
1430     dso__set_long_name(dso, strdup(kcore_filename), true);
1431 
1432     close(fd);
1433 
1434     if (map->prot & PROT_EXEC)
1435         pr_debug("Using %s for kernel object code\n", kcore_filename);
1436     else
1437         pr_debug("Using %s for kernel data\n", kcore_filename);
1438 
1439     return 0;
1440 
1441 out_err:
1442     while (!list_empty(&md.maps)) {
1443         map = list_entry(md.maps.next, struct map, node);
1444         list_del_init(&map->node);
1445         map__put(map);
1446     }
1447     close(fd);
1448     return -EINVAL;
1449 }
1450 
1451 /*
1452  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1453  * delta based on the relocation reference symbol.
1454  */
1455 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1456 {
1457     u64 addr;
1458 
1459     if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1460         return 0;
1461 
1462     if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1463         return -1;
1464 
1465     *delta = addr - kmap->ref_reloc_sym->addr;
1466     return 0;
1467 }
1468 
1469 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1470              struct map *map, bool no_kcore)
1471 {
1472     struct kmap *kmap = map__kmap(map);
1473     u64 delta = 0;
1474 
1475     if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1476         return -1;
1477 
1478     if (!kmap || !kmap->kmaps)
1479         return -1;
1480 
1481     if (dso__load_all_kallsyms(dso, filename) < 0)
1482         return -1;
1483 
1484     if (kallsyms__delta(kmap, filename, &delta))
1485         return -1;
1486 
1487     symbols__fixup_end(&dso->symbols, true);
1488     symbols__fixup_duplicate(&dso->symbols);
1489 
1490     if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1491         dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1492     else
1493         dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1494 
1495     if (!no_kcore && !dso__load_kcore(dso, map, filename))
1496         return maps__split_kallsyms_for_kcore(kmap->kmaps, dso);
1497     else
1498         return maps__split_kallsyms(kmap->kmaps, dso, delta, map);
1499 }
1500 
1501 int dso__load_kallsyms(struct dso *dso, const char *filename,
1502                struct map *map)
1503 {
1504     return __dso__load_kallsyms(dso, filename, map, false);
1505 }
1506 
1507 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1508 {
1509     char *line = NULL;
1510     size_t n;
1511     FILE *file;
1512     int nr_syms = 0;
1513 
1514     file = fopen(map_path, "r");
1515     if (file == NULL)
1516         goto out_failure;
1517 
1518     while (!feof(file)) {
1519         u64 start, size;
1520         struct symbol *sym;
1521         int line_len, len;
1522 
1523         line_len = getline(&line, &n, file);
1524         if (line_len < 0)
1525             break;
1526 
1527         if (!line)
1528             goto out_failure;
1529 
1530         line[--line_len] = '\0'; /* \n */
1531 
1532         len = hex2u64(line, &start);
1533 
1534         len++;
1535         if (len + 2 >= line_len)
1536             continue;
1537 
1538         len += hex2u64(line + len, &size);
1539 
1540         len++;
1541         if (len + 2 >= line_len)
1542             continue;
1543 
1544         sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1545 
1546         if (sym == NULL)
1547             goto out_delete_line;
1548 
1549         symbols__insert(&dso->symbols, sym);
1550         nr_syms++;
1551     }
1552 
1553     free(line);
1554     fclose(file);
1555 
1556     return nr_syms;
1557 
1558 out_delete_line:
1559     free(line);
1560 out_failure:
1561     return -1;
1562 }
1563 
1564 #ifdef HAVE_LIBBFD_SUPPORT
1565 #define PACKAGE 'perf'
1566 #include <bfd.h>
1567 
1568 static int bfd_symbols__cmpvalue(const void *a, const void *b)
1569 {
1570     const asymbol *as = *(const asymbol **)a, *bs = *(const asymbol **)b;
1571 
1572     if (bfd_asymbol_value(as) != bfd_asymbol_value(bs))
1573         return bfd_asymbol_value(as) - bfd_asymbol_value(bs);
1574 
1575     return bfd_asymbol_name(as)[0] - bfd_asymbol_name(bs)[0];
1576 }
1577 
1578 static int bfd2elf_binding(asymbol *symbol)
1579 {
1580     if (symbol->flags & BSF_WEAK)
1581         return STB_WEAK;
1582     if (symbol->flags & BSF_GLOBAL)
1583         return STB_GLOBAL;
1584     if (symbol->flags & BSF_LOCAL)
1585         return STB_LOCAL;
1586     return -1;
1587 }
1588 
1589 int dso__load_bfd_symbols(struct dso *dso, const char *debugfile)
1590 {
1591     int err = -1;
1592     long symbols_size, symbols_count, i;
1593     asection *section;
1594     asymbol **symbols, *sym;
1595     struct symbol *symbol;
1596     bfd *abfd;
1597     u64 start, len;
1598 
1599     abfd = bfd_openr(debugfile, NULL);
1600     if (!abfd)
1601         return -1;
1602 
1603     if (!bfd_check_format(abfd, bfd_object)) {
1604         pr_debug2("%s: cannot read %s bfd file.\n", __func__,
1605               dso->long_name);
1606         goto out_close;
1607     }
1608 
1609     if (bfd_get_flavour(abfd) == bfd_target_elf_flavour)
1610         goto out_close;
1611 
1612     symbols_size = bfd_get_symtab_upper_bound(abfd);
1613     if (symbols_size == 0) {
1614         bfd_close(abfd);
1615         return 0;
1616     }
1617 
1618     if (symbols_size < 0)
1619         goto out_close;
1620 
1621     symbols = malloc(symbols_size);
1622     if (!symbols)
1623         goto out_close;
1624 
1625     symbols_count = bfd_canonicalize_symtab(abfd, symbols);
1626     if (symbols_count < 0)
1627         goto out_free;
1628 
1629     section = bfd_get_section_by_name(abfd, ".text");
1630     if (section) {
1631         for (i = 0; i < symbols_count; ++i) {
1632             if (!strcmp(bfd_asymbol_name(symbols[i]), "__ImageBase") ||
1633                 !strcmp(bfd_asymbol_name(symbols[i]), "__image_base__"))
1634                 break;
1635         }
1636         if (i < symbols_count) {
1637             /* PE symbols can only have 4 bytes, so use .text high bits */
1638             dso->text_offset = section->vma - (u32)section->vma;
1639             dso->text_offset += (u32)bfd_asymbol_value(symbols[i]);
1640         } else {
1641             dso->text_offset = section->vma - section->filepos;
1642         }
1643     }
1644 
1645     qsort(symbols, symbols_count, sizeof(asymbol *), bfd_symbols__cmpvalue);
1646 
1647 #ifdef bfd_get_section
1648 #define bfd_asymbol_section bfd_get_section
1649 #endif
1650     for (i = 0; i < symbols_count; ++i) {
1651         sym = symbols[i];
1652         section = bfd_asymbol_section(sym);
1653         if (bfd2elf_binding(sym) < 0)
1654             continue;
1655 
1656         while (i + 1 < symbols_count &&
1657                bfd_asymbol_section(symbols[i + 1]) == section &&
1658                bfd2elf_binding(symbols[i + 1]) < 0)
1659             i++;
1660 
1661         if (i + 1 < symbols_count &&
1662             bfd_asymbol_section(symbols[i + 1]) == section)
1663             len = symbols[i + 1]->value - sym->value;
1664         else
1665             len = section->size - sym->value;
1666 
1667         start = bfd_asymbol_value(sym) - dso->text_offset;
1668         symbol = symbol__new(start, len, bfd2elf_binding(sym), STT_FUNC,
1669                      bfd_asymbol_name(sym));
1670         if (!symbol)
1671             goto out_free;
1672 
1673         symbols__insert(&dso->symbols, symbol);
1674     }
1675 #ifdef bfd_get_section
1676 #undef bfd_asymbol_section
1677 #endif
1678 
1679     symbols__fixup_end(&dso->symbols, false);
1680     symbols__fixup_duplicate(&dso->symbols);
1681     dso->adjust_symbols = 1;
1682 
1683     err = 0;
1684 out_free:
1685     free(symbols);
1686 out_close:
1687     bfd_close(abfd);
1688     return err;
1689 }
1690 #endif
1691 
1692 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1693                        enum dso_binary_type type)
1694 {
1695     switch (type) {
1696     case DSO_BINARY_TYPE__JAVA_JIT:
1697     case DSO_BINARY_TYPE__DEBUGLINK:
1698     case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1699     case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1700     case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1701     case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
1702     case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1703     case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1704         return !kmod && dso->kernel == DSO_SPACE__USER;
1705 
1706     case DSO_BINARY_TYPE__KALLSYMS:
1707     case DSO_BINARY_TYPE__VMLINUX:
1708     case DSO_BINARY_TYPE__KCORE:
1709         return dso->kernel == DSO_SPACE__KERNEL;
1710 
1711     case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1712     case DSO_BINARY_TYPE__GUEST_VMLINUX:
1713     case DSO_BINARY_TYPE__GUEST_KCORE:
1714         return dso->kernel == DSO_SPACE__KERNEL_GUEST;
1715 
1716     case DSO_BINARY_TYPE__GUEST_KMODULE:
1717     case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1718     case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1719     case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1720         /*
1721          * kernel modules know their symtab type - it's set when
1722          * creating a module dso in machine__addnew_module_map().
1723          */
1724         return kmod && dso->symtab_type == type;
1725 
1726     case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1727     case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1728         return true;
1729 
1730     case DSO_BINARY_TYPE__BPF_PROG_INFO:
1731     case DSO_BINARY_TYPE__BPF_IMAGE:
1732     case DSO_BINARY_TYPE__OOL:
1733     case DSO_BINARY_TYPE__NOT_FOUND:
1734     default:
1735         return false;
1736     }
1737 }
1738 
1739 /* Checks for the existence of the perf-<pid>.map file in two different
1740  * locations.  First, if the process is a separate mount namespace, check in
1741  * that namespace using the pid of the innermost pid namespace.  If's not in a
1742  * namespace, or the file can't be found there, try in the mount namespace of
1743  * the tracing process using our view of its pid.
1744  */
1745 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1746                   struct nsinfo **nsip)
1747 {
1748     struct nscookie nsc;
1749     struct nsinfo *nsi;
1750     struct nsinfo *nnsi;
1751     int rc = -1;
1752 
1753     nsi = *nsip;
1754 
1755     if (nsinfo__need_setns(nsi)) {
1756         snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsinfo__nstgid(nsi));
1757         nsinfo__mountns_enter(nsi, &nsc);
1758         rc = access(filebuf, R_OK);
1759         nsinfo__mountns_exit(&nsc);
1760         if (rc == 0)
1761             return rc;
1762     }
1763 
1764     nnsi = nsinfo__copy(nsi);
1765     if (nnsi) {
1766         nsinfo__put(nsi);
1767 
1768         nsinfo__clear_need_setns(nnsi);
1769         snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsinfo__tgid(nnsi));
1770         *nsip = nnsi;
1771         rc = 0;
1772     }
1773 
1774     return rc;
1775 }
1776 
1777 int dso__load(struct dso *dso, struct map *map)
1778 {
1779     char *name;
1780     int ret = -1;
1781     u_int i;
1782     struct machine *machine = NULL;
1783     char *root_dir = (char *) "";
1784     int ss_pos = 0;
1785     struct symsrc ss_[2];
1786     struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1787     bool kmod;
1788     bool perfmap;
1789     struct build_id bid;
1790     struct nscookie nsc;
1791     char newmapname[PATH_MAX];
1792     const char *map_path = dso->long_name;
1793 
1794     perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1795     if (perfmap) {
1796         if (dso->nsinfo && (dso__find_perf_map(newmapname,
1797             sizeof(newmapname), &dso->nsinfo) == 0)) {
1798             map_path = newmapname;
1799         }
1800     }
1801 
1802     nsinfo__mountns_enter(dso->nsinfo, &nsc);
1803     pthread_mutex_lock(&dso->lock);
1804 
1805     /* check again under the dso->lock */
1806     if (dso__loaded(dso)) {
1807         ret = 1;
1808         goto out;
1809     }
1810 
1811     kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1812         dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1813         dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1814         dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1815 
1816     if (dso->kernel && !kmod) {
1817         if (dso->kernel == DSO_SPACE__KERNEL)
1818             ret = dso__load_kernel_sym(dso, map);
1819         else if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1820             ret = dso__load_guest_kernel_sym(dso, map);
1821 
1822         machine = map__kmaps(map)->machine;
1823         if (machine__is(machine, "x86_64"))
1824             machine__map_x86_64_entry_trampolines(machine, dso);
1825         goto out;
1826     }
1827 
1828     dso->adjust_symbols = 0;
1829 
1830     if (perfmap) {
1831         ret = dso__load_perf_map(map_path, dso);
1832         dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1833                          DSO_BINARY_TYPE__NOT_FOUND;
1834         goto out;
1835     }
1836 
1837     if (machine)
1838         root_dir = machine->root_dir;
1839 
1840     name = malloc(PATH_MAX);
1841     if (!name)
1842         goto out;
1843 
1844     /*
1845      * Read the build id if possible. This is required for
1846      * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1847      */
1848     if (!dso->has_build_id &&
1849         is_regular_file(dso->long_name)) {
1850         __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1851         if (filename__read_build_id(name, &bid) > 0)
1852             dso__set_build_id(dso, &bid);
1853     }
1854 
1855     /*
1856      * Iterate over candidate debug images.
1857      * Keep track of "interesting" ones (those which have a symtab, dynsym,
1858      * and/or opd section) for processing.
1859      */
1860     for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1861         struct symsrc *ss = &ss_[ss_pos];
1862         bool next_slot = false;
1863         bool is_reg;
1864         bool nsexit;
1865         int bfdrc = -1;
1866         int sirc = -1;
1867 
1868         enum dso_binary_type symtab_type = binary_type_symtab[i];
1869 
1870         nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1871             symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1872 
1873         if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1874             continue;
1875 
1876         if (dso__read_binary_type_filename(dso, symtab_type,
1877                            root_dir, name, PATH_MAX))
1878             continue;
1879 
1880         if (nsexit)
1881             nsinfo__mountns_exit(&nsc);
1882 
1883         is_reg = is_regular_file(name);
1884         if (!is_reg && errno == ENOENT && dso->nsinfo) {
1885             char *new_name = filename_with_chroot(dso->nsinfo->pid,
1886                                   name);
1887             if (new_name) {
1888                 is_reg = is_regular_file(new_name);
1889                 strlcpy(name, new_name, PATH_MAX);
1890                 free(new_name);
1891             }
1892         }
1893 
1894 #ifdef HAVE_LIBBFD_SUPPORT
1895         if (is_reg)
1896             bfdrc = dso__load_bfd_symbols(dso, name);
1897 #endif
1898         if (is_reg && bfdrc < 0)
1899             sirc = symsrc__init(ss, dso, name, symtab_type);
1900 
1901         if (nsexit)
1902             nsinfo__mountns_enter(dso->nsinfo, &nsc);
1903 
1904         if (bfdrc == 0) {
1905             ret = 0;
1906             break;
1907         }
1908 
1909         if (!is_reg || sirc < 0)
1910             continue;
1911 
1912         if (!syms_ss && symsrc__has_symtab(ss)) {
1913             syms_ss = ss;
1914             next_slot = true;
1915             if (!dso->symsrc_filename)
1916                 dso->symsrc_filename = strdup(name);
1917         }
1918 
1919         if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1920             runtime_ss = ss;
1921             next_slot = true;
1922         }
1923 
1924         if (next_slot) {
1925             ss_pos++;
1926 
1927             if (syms_ss && runtime_ss)
1928                 break;
1929         } else {
1930             symsrc__destroy(ss);
1931         }
1932 
1933     }
1934 
1935     if (!runtime_ss && !syms_ss)
1936         goto out_free;
1937 
1938     if (runtime_ss && !syms_ss) {
1939         syms_ss = runtime_ss;
1940     }
1941 
1942     /* We'll have to hope for the best */
1943     if (!runtime_ss && syms_ss)
1944         runtime_ss = syms_ss;
1945 
1946     if (syms_ss)
1947         ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1948     else
1949         ret = -1;
1950 
1951     if (ret > 0) {
1952         int nr_plt;
1953 
1954         nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1955         if (nr_plt > 0)
1956             ret += nr_plt;
1957     }
1958 
1959     for (; ss_pos > 0; ss_pos--)
1960         symsrc__destroy(&ss_[ss_pos - 1]);
1961 out_free:
1962     free(name);
1963     if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1964         ret = 0;
1965 out:
1966     dso__set_loaded(dso);
1967     pthread_mutex_unlock(&dso->lock);
1968     nsinfo__mountns_exit(&nsc);
1969 
1970     return ret;
1971 }
1972 
1973 static int map__strcmp(const void *a, const void *b)
1974 {
1975     const struct map *ma = *(const struct map **)a, *mb = *(const struct map **)b;
1976     return strcmp(ma->dso->short_name, mb->dso->short_name);
1977 }
1978 
1979 static int map__strcmp_name(const void *name, const void *b)
1980 {
1981     const struct map *map = *(const struct map **)b;
1982     return strcmp(name, map->dso->short_name);
1983 }
1984 
1985 void __maps__sort_by_name(struct maps *maps)
1986 {
1987     qsort(maps->maps_by_name, maps->nr_maps, sizeof(struct map *), map__strcmp);
1988 }
1989 
1990 static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
1991 {
1992     struct map *map;
1993     struct map **maps_by_name = realloc(maps->maps_by_name, maps->nr_maps * sizeof(map));
1994     int i = 0;
1995 
1996     if (maps_by_name == NULL)
1997         return -1;
1998 
1999     maps->maps_by_name = maps_by_name;
2000     maps->nr_maps_allocated = maps->nr_maps;
2001 
2002     maps__for_each_entry(maps, map)
2003         maps_by_name[i++] = map;
2004 
2005     __maps__sort_by_name(maps);
2006     return 0;
2007 }
2008 
2009 static struct map *__maps__find_by_name(struct maps *maps, const char *name)
2010 {
2011     struct map **mapp;
2012 
2013     if (maps->maps_by_name == NULL &&
2014         map__groups__sort_by_name_from_rbtree(maps))
2015         return NULL;
2016 
2017     mapp = bsearch(name, maps->maps_by_name, maps->nr_maps, sizeof(*mapp), map__strcmp_name);
2018     if (mapp)
2019         return *mapp;
2020     return NULL;
2021 }
2022 
2023 struct map *maps__find_by_name(struct maps *maps, const char *name)
2024 {
2025     struct map *map;
2026 
2027     down_read(&maps->lock);
2028 
2029     if (maps->last_search_by_name && strcmp(maps->last_search_by_name->dso->short_name, name) == 0) {
2030         map = maps->last_search_by_name;
2031         goto out_unlock;
2032     }
2033     /*
2034      * If we have maps->maps_by_name, then the name isn't in the rbtree,
2035      * as maps->maps_by_name mirrors the rbtree when lookups by name are
2036      * made.
2037      */
2038     map = __maps__find_by_name(maps, name);
2039     if (map || maps->maps_by_name != NULL)
2040         goto out_unlock;
2041 
2042     /* Fallback to traversing the rbtree... */
2043     maps__for_each_entry(maps, map)
2044         if (strcmp(map->dso->short_name, name) == 0) {
2045             maps->last_search_by_name = map;
2046             goto out_unlock;
2047         }
2048 
2049     map = NULL;
2050 
2051 out_unlock:
2052     up_read(&maps->lock);
2053     return map;
2054 }
2055 
2056 int dso__load_vmlinux(struct dso *dso, struct map *map,
2057               const char *vmlinux, bool vmlinux_allocated)
2058 {
2059     int err = -1;
2060     struct symsrc ss;
2061     char symfs_vmlinux[PATH_MAX];
2062     enum dso_binary_type symtab_type;
2063 
2064     if (vmlinux[0] == '/')
2065         snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
2066     else
2067         symbol__join_symfs(symfs_vmlinux, vmlinux);
2068 
2069     if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
2070         symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
2071     else
2072         symtab_type = DSO_BINARY_TYPE__VMLINUX;
2073 
2074     if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
2075         return -1;
2076 
2077     err = dso__load_sym(dso, map, &ss, &ss, 0);
2078     symsrc__destroy(&ss);
2079 
2080     if (err > 0) {
2081         if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
2082             dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
2083         else
2084             dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
2085         dso__set_long_name(dso, vmlinux, vmlinux_allocated);
2086         dso__set_loaded(dso);
2087         pr_debug("Using %s for symbols\n", symfs_vmlinux);
2088     }
2089 
2090     return err;
2091 }
2092 
2093 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
2094 {
2095     int i, err = 0;
2096     char *filename = NULL;
2097 
2098     pr_debug("Looking at the vmlinux_path (%d entries long)\n",
2099          vmlinux_path__nr_entries + 1);
2100 
2101     for (i = 0; i < vmlinux_path__nr_entries; ++i) {
2102         err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
2103         if (err > 0)
2104             goto out;
2105     }
2106 
2107     if (!symbol_conf.ignore_vmlinux_buildid)
2108         filename = dso__build_id_filename(dso, NULL, 0, false);
2109     if (filename != NULL) {
2110         err = dso__load_vmlinux(dso, map, filename, true);
2111         if (err > 0)
2112             goto out;
2113         free(filename);
2114     }
2115 out:
2116     return err;
2117 }
2118 
2119 static bool visible_dir_filter(const char *name, struct dirent *d)
2120 {
2121     if (d->d_type != DT_DIR)
2122         return false;
2123     return lsdir_no_dot_filter(name, d);
2124 }
2125 
2126 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
2127 {
2128     char kallsyms_filename[PATH_MAX];
2129     int ret = -1;
2130     struct strlist *dirs;
2131     struct str_node *nd;
2132 
2133     dirs = lsdir(dir, visible_dir_filter);
2134     if (!dirs)
2135         return -1;
2136 
2137     strlist__for_each_entry(nd, dirs) {
2138         scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
2139               "%s/%s/kallsyms", dir, nd->s);
2140         if (!validate_kcore_addresses(kallsyms_filename, map)) {
2141             strlcpy(dir, kallsyms_filename, dir_sz);
2142             ret = 0;
2143             break;
2144         }
2145     }
2146 
2147     strlist__delete(dirs);
2148 
2149     return ret;
2150 }
2151 
2152 /*
2153  * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
2154  * since access(R_OK) only checks with real UID/GID but open() use effective
2155  * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
2156  */
2157 static bool filename__readable(const char *file)
2158 {
2159     int fd = open(file, O_RDONLY);
2160     if (fd < 0)
2161         return false;
2162     close(fd);
2163     return true;
2164 }
2165 
2166 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
2167 {
2168     struct build_id bid;
2169     char sbuild_id[SBUILD_ID_SIZE];
2170     bool is_host = false;
2171     char path[PATH_MAX];
2172 
2173     if (!dso->has_build_id) {
2174         /*
2175          * Last resort, if we don't have a build-id and couldn't find
2176          * any vmlinux file, try the running kernel kallsyms table.
2177          */
2178         goto proc_kallsyms;
2179     }
2180 
2181     if (sysfs__read_build_id("/sys/kernel/notes", &bid) == 0)
2182         is_host = dso__build_id_equal(dso, &bid);
2183 
2184     /* Try a fast path for /proc/kallsyms if possible */
2185     if (is_host) {
2186         /*
2187          * Do not check the build-id cache, unless we know we cannot use
2188          * /proc/kcore or module maps don't match to /proc/kallsyms.
2189          * To check readability of /proc/kcore, do not use access(R_OK)
2190          * since /proc/kcore requires CAP_SYS_RAWIO to read and access
2191          * can't check it.
2192          */
2193         if (filename__readable("/proc/kcore") &&
2194             !validate_kcore_addresses("/proc/kallsyms", map))
2195             goto proc_kallsyms;
2196     }
2197 
2198     build_id__sprintf(&dso->bid, sbuild_id);
2199 
2200     /* Find kallsyms in build-id cache with kcore */
2201     scnprintf(path, sizeof(path), "%s/%s/%s",
2202           buildid_dir, DSO__NAME_KCORE, sbuild_id);
2203 
2204     if (!find_matching_kcore(map, path, sizeof(path)))
2205         return strdup(path);
2206 
2207     /* Use current /proc/kallsyms if possible */
2208     if (is_host) {
2209 proc_kallsyms:
2210         return strdup("/proc/kallsyms");
2211     }
2212 
2213     /* Finally, find a cache of kallsyms */
2214     if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
2215         pr_err("No kallsyms or vmlinux with build-id %s was found\n",
2216                sbuild_id);
2217         return NULL;
2218     }
2219 
2220     return strdup(path);
2221 }
2222 
2223 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
2224 {
2225     int err;
2226     const char *kallsyms_filename = NULL;
2227     char *kallsyms_allocated_filename = NULL;
2228     char *filename = NULL;
2229 
2230     /*
2231      * Step 1: if the user specified a kallsyms or vmlinux filename, use
2232      * it and only it, reporting errors to the user if it cannot be used.
2233      *
2234      * For instance, try to analyse an ARM perf.data file _without_ a
2235      * build-id, or if the user specifies the wrong path to the right
2236      * vmlinux file, obviously we can't fallback to another vmlinux (a
2237      * x86_86 one, on the machine where analysis is being performed, say),
2238      * or worse, /proc/kallsyms.
2239      *
2240      * If the specified file _has_ a build-id and there is a build-id
2241      * section in the perf.data file, we will still do the expected
2242      * validation in dso__load_vmlinux and will bail out if they don't
2243      * match.
2244      */
2245     if (symbol_conf.kallsyms_name != NULL) {
2246         kallsyms_filename = symbol_conf.kallsyms_name;
2247         goto do_kallsyms;
2248     }
2249 
2250     if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2251         return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2252     }
2253 
2254     /*
2255      * Before checking on common vmlinux locations, check if it's
2256      * stored as standard build id binary (not kallsyms) under
2257      * .debug cache.
2258      */
2259     if (!symbol_conf.ignore_vmlinux_buildid)
2260         filename = __dso__build_id_filename(dso, NULL, 0, false, false);
2261     if (filename != NULL) {
2262         err = dso__load_vmlinux(dso, map, filename, true);
2263         if (err > 0)
2264             return err;
2265         free(filename);
2266     }
2267 
2268     if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2269         err = dso__load_vmlinux_path(dso, map);
2270         if (err > 0)
2271             return err;
2272     }
2273 
2274     /* do not try local files if a symfs was given */
2275     if (symbol_conf.symfs[0] != 0)
2276         return -1;
2277 
2278     kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2279     if (!kallsyms_allocated_filename)
2280         return -1;
2281 
2282     kallsyms_filename = kallsyms_allocated_filename;
2283 
2284 do_kallsyms:
2285     err = dso__load_kallsyms(dso, kallsyms_filename, map);
2286     if (err > 0)
2287         pr_debug("Using %s for symbols\n", kallsyms_filename);
2288     free(kallsyms_allocated_filename);
2289 
2290     if (err > 0 && !dso__is_kcore(dso)) {
2291         dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2292         dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2293         map__fixup_start(map);
2294         map__fixup_end(map);
2295     }
2296 
2297     return err;
2298 }
2299 
2300 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2301 {
2302     int err;
2303     const char *kallsyms_filename;
2304     struct machine *machine = map__kmaps(map)->machine;
2305     char path[PATH_MAX];
2306 
2307     if (machine->kallsyms_filename) {
2308         kallsyms_filename = machine->kallsyms_filename;
2309     } else if (machine__is_default_guest(machine)) {
2310         /*
2311          * if the user specified a vmlinux filename, use it and only
2312          * it, reporting errors to the user if it cannot be used.
2313          * Or use file guest_kallsyms inputted by user on commandline
2314          */
2315         if (symbol_conf.default_guest_vmlinux_name != NULL) {
2316             err = dso__load_vmlinux(dso, map,
2317                         symbol_conf.default_guest_vmlinux_name,
2318                         false);
2319             return err;
2320         }
2321 
2322         kallsyms_filename = symbol_conf.default_guest_kallsyms;
2323         if (!kallsyms_filename)
2324             return -1;
2325     } else {
2326         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2327         kallsyms_filename = path;
2328     }
2329 
2330     err = dso__load_kallsyms(dso, kallsyms_filename, map);
2331     if (err > 0)
2332         pr_debug("Using %s for symbols\n", kallsyms_filename);
2333     if (err > 0 && !dso__is_kcore(dso)) {
2334         dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2335         dso__set_long_name(dso, machine->mmap_name, false);
2336         map__fixup_start(map);
2337         map__fixup_end(map);
2338     }
2339 
2340     return err;
2341 }
2342 
2343 static void vmlinux_path__exit(void)
2344 {
2345     while (--vmlinux_path__nr_entries >= 0)
2346         zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2347     vmlinux_path__nr_entries = 0;
2348 
2349     zfree(&vmlinux_path);
2350 }
2351 
2352 static const char * const vmlinux_paths[] = {
2353     "vmlinux",
2354     "/boot/vmlinux"
2355 };
2356 
2357 static const char * const vmlinux_paths_upd[] = {
2358     "/boot/vmlinux-%s",
2359     "/usr/lib/debug/boot/vmlinux-%s",
2360     "/lib/modules/%s/build/vmlinux",
2361     "/usr/lib/debug/lib/modules/%s/vmlinux",
2362     "/usr/lib/debug/boot/vmlinux-%s.debug"
2363 };
2364 
2365 static int vmlinux_path__add(const char *new_entry)
2366 {
2367     vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2368     if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2369         return -1;
2370     ++vmlinux_path__nr_entries;
2371 
2372     return 0;
2373 }
2374 
2375 static int vmlinux_path__init(struct perf_env *env)
2376 {
2377     struct utsname uts;
2378     char bf[PATH_MAX];
2379     char *kernel_version;
2380     unsigned int i;
2381 
2382     vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2383                   ARRAY_SIZE(vmlinux_paths_upd)));
2384     if (vmlinux_path == NULL)
2385         return -1;
2386 
2387     for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2388         if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2389             goto out_fail;
2390 
2391     /* only try kernel version if no symfs was given */
2392     if (symbol_conf.symfs[0] != 0)
2393         return 0;
2394 
2395     if (env) {
2396         kernel_version = env->os_release;
2397     } else {
2398         if (uname(&uts) < 0)
2399             goto out_fail;
2400 
2401         kernel_version = uts.release;
2402     }
2403 
2404     for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2405         snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2406         if (vmlinux_path__add(bf) < 0)
2407             goto out_fail;
2408     }
2409 
2410     return 0;
2411 
2412 out_fail:
2413     vmlinux_path__exit();
2414     return -1;
2415 }
2416 
2417 int setup_list(struct strlist **list, const char *list_str,
2418               const char *list_name)
2419 {
2420     if (list_str == NULL)
2421         return 0;
2422 
2423     *list = strlist__new(list_str, NULL);
2424     if (!*list) {
2425         pr_err("problems parsing %s list\n", list_name);
2426         return -1;
2427     }
2428 
2429     symbol_conf.has_filter = true;
2430     return 0;
2431 }
2432 
2433 int setup_intlist(struct intlist **list, const char *list_str,
2434           const char *list_name)
2435 {
2436     if (list_str == NULL)
2437         return 0;
2438 
2439     *list = intlist__new(list_str);
2440     if (!*list) {
2441         pr_err("problems parsing %s list\n", list_name);
2442         return -1;
2443     }
2444     return 0;
2445 }
2446 
2447 static int setup_addrlist(struct intlist **addr_list, struct strlist *sym_list)
2448 {
2449     struct str_node *pos, *tmp;
2450     unsigned long val;
2451     char *sep;
2452     const char *end;
2453     int i = 0, err;
2454 
2455     *addr_list = intlist__new(NULL);
2456     if (!*addr_list)
2457         return -1;
2458 
2459     strlist__for_each_entry_safe(pos, tmp, sym_list) {
2460         errno = 0;
2461         val = strtoul(pos->s, &sep, 16);
2462         if (errno || (sep == pos->s))
2463             continue;
2464 
2465         if (*sep != '\0') {
2466             end = pos->s + strlen(pos->s) - 1;
2467             while (end >= sep && isspace(*end))
2468                 end--;
2469 
2470             if (end >= sep)
2471                 continue;
2472         }
2473 
2474         err = intlist__add(*addr_list, val);
2475         if (err)
2476             break;
2477 
2478         strlist__remove(sym_list, pos);
2479         i++;
2480     }
2481 
2482     if (i == 0) {
2483         intlist__delete(*addr_list);
2484         *addr_list = NULL;
2485     }
2486 
2487     return 0;
2488 }
2489 
2490 static bool symbol__read_kptr_restrict(void)
2491 {
2492     bool value = false;
2493     FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2494 
2495     if (fp != NULL) {
2496         char line[8];
2497 
2498         if (fgets(line, sizeof(line), fp) != NULL)
2499             value = perf_cap__capable(CAP_SYSLOG) ?
2500                     (atoi(line) >= 2) :
2501                     (atoi(line) != 0);
2502 
2503         fclose(fp);
2504     }
2505 
2506     /* Per kernel/kallsyms.c:
2507      * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2508      */
2509     if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2510         value = true;
2511 
2512     return value;
2513 }
2514 
2515 int symbol__annotation_init(void)
2516 {
2517     if (symbol_conf.init_annotation)
2518         return 0;
2519 
2520     if (symbol_conf.initialized) {
2521         pr_err("Annotation needs to be init before symbol__init()\n");
2522         return -1;
2523     }
2524 
2525     symbol_conf.priv_size += sizeof(struct annotation);
2526     symbol_conf.init_annotation = true;
2527     return 0;
2528 }
2529 
2530 int symbol__init(struct perf_env *env)
2531 {
2532     const char *symfs;
2533 
2534     if (symbol_conf.initialized)
2535         return 0;
2536 
2537     symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2538 
2539     symbol__elf_init();
2540 
2541     if (symbol_conf.sort_by_name)
2542         symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2543                       sizeof(struct symbol));
2544 
2545     if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2546         return -1;
2547 
2548     if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2549         pr_err("'.' is the only non valid --field-separator argument\n");
2550         return -1;
2551     }
2552 
2553     if (setup_list(&symbol_conf.dso_list,
2554                symbol_conf.dso_list_str, "dso") < 0)
2555         return -1;
2556 
2557     if (setup_list(&symbol_conf.comm_list,
2558                symbol_conf.comm_list_str, "comm") < 0)
2559         goto out_free_dso_list;
2560 
2561     if (setup_intlist(&symbol_conf.pid_list,
2562                symbol_conf.pid_list_str, "pid") < 0)
2563         goto out_free_comm_list;
2564 
2565     if (setup_intlist(&symbol_conf.tid_list,
2566                symbol_conf.tid_list_str, "tid") < 0)
2567         goto out_free_pid_list;
2568 
2569     if (setup_list(&symbol_conf.sym_list,
2570                symbol_conf.sym_list_str, "symbol") < 0)
2571         goto out_free_tid_list;
2572 
2573     if (symbol_conf.sym_list &&
2574         setup_addrlist(&symbol_conf.addr_list, symbol_conf.sym_list) < 0)
2575         goto out_free_sym_list;
2576 
2577     if (setup_list(&symbol_conf.bt_stop_list,
2578                symbol_conf.bt_stop_list_str, "symbol") < 0)
2579         goto out_free_sym_list;
2580 
2581     /*
2582      * A path to symbols of "/" is identical to ""
2583      * reset here for simplicity.
2584      */
2585     symfs = realpath(symbol_conf.symfs, NULL);
2586     if (symfs == NULL)
2587         symfs = symbol_conf.symfs;
2588     if (strcmp(symfs, "/") == 0)
2589         symbol_conf.symfs = "";
2590     if (symfs != symbol_conf.symfs)
2591         free((void *)symfs);
2592 
2593     symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2594 
2595     symbol_conf.initialized = true;
2596     return 0;
2597 
2598 out_free_sym_list:
2599     strlist__delete(symbol_conf.sym_list);
2600     intlist__delete(symbol_conf.addr_list);
2601 out_free_tid_list:
2602     intlist__delete(symbol_conf.tid_list);
2603 out_free_pid_list:
2604     intlist__delete(symbol_conf.pid_list);
2605 out_free_comm_list:
2606     strlist__delete(symbol_conf.comm_list);
2607 out_free_dso_list:
2608     strlist__delete(symbol_conf.dso_list);
2609     return -1;
2610 }
2611 
2612 void symbol__exit(void)
2613 {
2614     if (!symbol_conf.initialized)
2615         return;
2616     strlist__delete(symbol_conf.bt_stop_list);
2617     strlist__delete(symbol_conf.sym_list);
2618     strlist__delete(symbol_conf.dso_list);
2619     strlist__delete(symbol_conf.comm_list);
2620     intlist__delete(symbol_conf.tid_list);
2621     intlist__delete(symbol_conf.pid_list);
2622     intlist__delete(symbol_conf.addr_list);
2623     vmlinux_path__exit();
2624     symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2625     symbol_conf.bt_stop_list = NULL;
2626     symbol_conf.initialized = false;
2627 }
2628 
2629 int symbol__config_symfs(const struct option *opt __maybe_unused,
2630              const char *dir, int unset __maybe_unused)
2631 {
2632     char *bf = NULL;
2633     int ret;
2634 
2635     symbol_conf.symfs = strdup(dir);
2636     if (symbol_conf.symfs == NULL)
2637         return -ENOMEM;
2638 
2639     /* skip the locally configured cache if a symfs is given, and
2640      * config buildid dir to symfs/.debug
2641      */
2642     ret = asprintf(&bf, "%s/%s", dir, ".debug");
2643     if (ret < 0)
2644         return -ENOMEM;
2645 
2646     set_buildid_dir(bf);
2647 
2648     free(bf);
2649     return 0;
2650 }
2651 
2652 struct mem_info *mem_info__get(struct mem_info *mi)
2653 {
2654     if (mi)
2655         refcount_inc(&mi->refcnt);
2656     return mi;
2657 }
2658 
2659 void mem_info__put(struct mem_info *mi)
2660 {
2661     if (mi && refcount_dec_and_test(&mi->refcnt))
2662         free(mi);
2663 }
2664 
2665 struct mem_info *mem_info__new(void)
2666 {
2667     struct mem_info *mi = zalloc(sizeof(*mi));
2668 
2669     if (mi)
2670         refcount_set(&mi->refcnt, 1);
2671     return mi;
2672 }
2673 
2674 /*
2675  * Checks that user supplied symbol kernel files are accessible because
2676  * the default mechanism for accessing elf files fails silently. i.e. if
2677  * debug syms for a build ID aren't found perf carries on normally. When
2678  * they are user supplied we should assume that the user doesn't want to
2679  * silently fail.
2680  */
2681 int symbol__validate_sym_arguments(void)
2682 {
2683     if (symbol_conf.vmlinux_name &&
2684         access(symbol_conf.vmlinux_name, R_OK)) {
2685         pr_err("Invalid file: %s\n", symbol_conf.vmlinux_name);
2686         return -EINVAL;
2687     }
2688     if (symbol_conf.kallsyms_name &&
2689         access(symbol_conf.kallsyms_name, R_OK)) {
2690         pr_err("Invalid file: %s\n", symbol_conf.kallsyms_name);
2691         return -EINVAL;
2692     }
2693     return 0;
2694 }
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