trace/beauty/prctl.c

0001 // SPDX-License-Identifier: LGPL-2.1
0002 /*
0003  * trace/beauty/prctl.c
0004  *
0005  *  Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
0006  */
0007
0008 #include "trace/beauty/beauty.h"
0009 #include <linux/kernel.h>
0010 #include <uapi/linux/prctl.h>
0011
0012 #include "trace/beauty/generated/prctl_option_array.c"
0013
0014 DEFINE_STRARRAY(prctl_options, "PR_");
0015
0016 static size_t prctl__scnprintf_option(int option, char *bf, size_t size, bool show_prefix)
0017 {
0018     return strarray__scnprintf(&strarray__prctl_options, bf, size, "%d", show_prefix, option);
0019 }
0020
0021 static size_t prctl__scnprintf_set_mm(int option, char *bf, size_t size, bool show_prefix)
0022 {
0023     static DEFINE_STRARRAY(prctl_set_mm_options, "PR_SET_MM_");
0024     return strarray__scnprintf(&strarray__prctl_set_mm_options, bf, size, "%d", show_prefix, option);
0025 }
0026
0027 size_t syscall_arg__scnprintf_prctl_arg2(char *bf, size_t size, struct syscall_arg *arg)
0028 {
0029     int option = syscall_arg__val(arg, 0);
0030
0031     if (option == PR_SET_MM)
0032         return prctl__scnprintf_set_mm(arg->val, bf, size, arg->show_string_prefix);
0033     /*
0034      * We still don't grab the contents of pointers on entry or exit,
0035      * so just print them as hex numbers
0036      */
0037     if (option == PR_SET_NAME)
0038         return syscall_arg__scnprintf_hex(bf, size, arg);
0039
0040     return syscall_arg__scnprintf_long(bf, size, arg);
0041 }
0042
0043 size_t syscall_arg__scnprintf_prctl_arg3(char *bf, size_t size, struct syscall_arg *arg)
0044 {
0045     int option = syscall_arg__val(arg, 0);
0046
0047     if (option == PR_SET_MM)
0048         return syscall_arg__scnprintf_hex(bf, size, arg);
0049
0050     return syscall_arg__scnprintf_long(bf, size, arg);
0051 }
0052
0053 size_t syscall_arg__scnprintf_prctl_option(char *bf, size_t size, struct syscall_arg *arg)
0054 {
0055     unsigned long option = arg->val;
0056     enum {
0057                 SPO_ARG2 = (1 << 1),
0058                 SPO_ARG3 = (1 << 2),
0059                 SPO_ARG4 = (1 << 3),
0060                 SPO_ARG5 = (1 << 4),
0061                 SPO_ARG6 = (1 << 5),
0062         };
0063     const u8 all_but2 = SPO_ARG3 | SPO_ARG4 | SPO_ARG5 | SPO_ARG6;
0064     const u8 all = SPO_ARG2 | all_but2;
0065     const u8 masks[] = {
0066         [PR_GET_DUMPABLE]    = all,
0067         [PR_SET_DUMPABLE]    = all_but2,
0068         [PR_SET_NAME]        = all_but2,
0069         [PR_GET_CHILD_SUBREAPER] = all_but2,
0070         [PR_SET_CHILD_SUBREAPER] = all_but2,
0071         [PR_GET_SECUREBITS]  = all,
0072         [PR_SET_SECUREBITS]  = all_but2,
0073         [PR_SET_MM]      = SPO_ARG4 | SPO_ARG5 | SPO_ARG6,
0074         [PR_GET_PDEATHSIG]   = all,
0075         [PR_SET_PDEATHSIG]   = all_but2,
0076     };
0077
0078     if (option < ARRAY_SIZE(masks))
0079         arg->mask |= masks[option];
0080
0081     return prctl__scnprintf_option(option, bf, size, arg->show_string_prefix);
0082 }