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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/file.c
  *
  * Copyright (C) 2005-2011  NTT DATA CORPORATION
  */
 
 #include "common.h"
 #include <linux/slab.h>
 
 /*
  * Mapping table from "enum tomoyo_path_acl_index" to "enum tomoyo_mac_index".
  */
 static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
     [TOMOYO_TYPE_EXECUTE]    = TOMOYO_MAC_FILE_EXECUTE,
     [TOMOYO_TYPE_READ]       = TOMOYO_MAC_FILE_OPEN,
     [TOMOYO_TYPE_WRITE]      = TOMOYO_MAC_FILE_OPEN,
     [TOMOYO_TYPE_APPEND]     = TOMOYO_MAC_FILE_OPEN,
     [TOMOYO_TYPE_UNLINK]     = TOMOYO_MAC_FILE_UNLINK,
     [TOMOYO_TYPE_GETATTR]    = TOMOYO_MAC_FILE_GETATTR,
     [TOMOYO_TYPE_RMDIR]      = TOMOYO_MAC_FILE_RMDIR,
     [TOMOYO_TYPE_TRUNCATE]   = TOMOYO_MAC_FILE_TRUNCATE,
     [TOMOYO_TYPE_SYMLINK]    = TOMOYO_MAC_FILE_SYMLINK,
     [TOMOYO_TYPE_CHROOT]     = TOMOYO_MAC_FILE_CHROOT,
     [TOMOYO_TYPE_UMOUNT]     = TOMOYO_MAC_FILE_UMOUNT,
 };
 
 /*
  * Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index".
  */
 const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
     [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
     [TOMOYO_TYPE_MKCHAR]  = TOMOYO_MAC_FILE_MKCHAR,
 };
 
 /*
  * Mapping table from "enum tomoyo_path2_acl_index" to "enum tomoyo_mac_index".
  */
 const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
     [TOMOYO_TYPE_LINK]       = TOMOYO_MAC_FILE_LINK,
     [TOMOYO_TYPE_RENAME]     = TOMOYO_MAC_FILE_RENAME,
     [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
 };
 
 /*
  * Mapping table from "enum tomoyo_path_number_acl_index" to
  * "enum tomoyo_mac_index".
  */
 const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
     [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
     [TOMOYO_TYPE_MKDIR]  = TOMOYO_MAC_FILE_MKDIR,
     [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
     [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
     [TOMOYO_TYPE_IOCTL]  = TOMOYO_MAC_FILE_IOCTL,
     [TOMOYO_TYPE_CHMOD]  = TOMOYO_MAC_FILE_CHMOD,
     [TOMOYO_TYPE_CHOWN]  = TOMOYO_MAC_FILE_CHOWN,
     [TOMOYO_TYPE_CHGRP]  = TOMOYO_MAC_FILE_CHGRP,
 };
 
 /**
  * tomoyo_put_name_union - Drop reference on "struct tomoyo_name_union".
  *
  * @ptr: Pointer to "struct tomoyo_name_union".
  *
  * Returns nothing.
  */
 void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
 {
     tomoyo_put_group(ptr->group);
     tomoyo_put_name(ptr->filename);
 }
 
 /**
  * tomoyo_compare_name_union - Check whether a name matches "struct tomoyo_name_union" or not.
  *
  * @name: Pointer to "struct tomoyo_path_info".
  * @ptr:  Pointer to "struct tomoyo_name_union".
  *
  * Returns "struct tomoyo_path_info" if @name matches @ptr, NULL otherwise.
  */
 const struct tomoyo_path_info *
 tomoyo_compare_name_union(const struct tomoyo_path_info *name,
               const struct tomoyo_name_union *ptr)
 {
     if (ptr->group)
         return tomoyo_path_matches_group(name, ptr->group);
     if (tomoyo_path_matches_pattern(name, ptr->filename))
         return ptr->filename;
     return NULL;
 }
 
 /**
  * tomoyo_put_number_union - Drop reference on "struct tomoyo_number_union".
  *
  * @ptr: Pointer to "struct tomoyo_number_union".
  *
  * Returns nothing.
  */
 void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
 {
     tomoyo_put_group(ptr->group);
 }
 
 /**
  * tomoyo_compare_number_union - Check whether a value matches "struct tomoyo_number_union" or not.
  *
  * @value: Number to check.
  * @ptr:   Pointer to "struct tomoyo_number_union".
  *
  * Returns true if @value matches @ptr, false otherwise.
  */
 bool tomoyo_compare_number_union(const unsigned long value,
                  const struct tomoyo_number_union *ptr)
 {
     if (ptr->group)
         return tomoyo_number_matches_group(value, value, ptr->group);
     return value >= ptr->values[0] && value <= ptr->values[1];
 }
 
 /**
  * tomoyo_add_slash - Add trailing '/' if needed.
  *
  * @buf: Pointer to "struct tomoyo_path_info".
  *
  * Returns nothing.
  *
  * @buf must be generated by tomoyo_encode() because this function does not
  * allocate memory for adding '/'.
  */
 static void tomoyo_add_slash(struct tomoyo_path_info *buf)
 {
     if (buf->is_dir)
         return;
     /*
      * This is OK because tomoyo_encode() reserves space for appending "/".
      */
     strcat((char *) buf->name, "/");
     tomoyo_fill_path_info(buf);
 }
 
 /**
  * tomoyo_get_realpath - Get realpath.
  *
  * @buf:  Pointer to "struct tomoyo_path_info".
  * @path: Pointer to "struct path".
  *
  * Returns true on success, false otherwise.
  */
 static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, const struct path *path)
 {
     buf->name = tomoyo_realpath_from_path(path);
     if (buf->name) {
         tomoyo_fill_path_info(buf);
         return true;
     }
     return false;
 }
 
 /**
  * tomoyo_audit_path_log - Audit path request log.
  *
  * @r: Pointer to "struct tomoyo_request_info".
  *
  * Returns 0 on success, negative value otherwise.
  */
 static int tomoyo_audit_path_log(struct tomoyo_request_info *r)
 {
     return tomoyo_supervisor(r, "file %s %s\n", tomoyo_path_keyword
                  [r->param.path.operation],
                  r->param.path.filename->name);
 }
 
 /**
  * tomoyo_audit_path2_log - Audit path/path request log.
  *
  * @r: Pointer to "struct tomoyo_request_info".
  *
  * Returns 0 on success, negative value otherwise.
  */
 static int tomoyo_audit_path2_log(struct tomoyo_request_info *r)
 {
     return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
                  [tomoyo_pp2mac[r->param.path2.operation]],
                  r->param.path2.filename1->name,
                  r->param.path2.filename2->name);
 }
 
 /**
  * tomoyo_audit_mkdev_log - Audit path/number/number/number request log.
  *
  * @r: Pointer to "struct tomoyo_request_info".
  *
  * Returns 0 on success, negative value otherwise.
  */
 static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r)
 {
     return tomoyo_supervisor(r, "file %s %s 0%o %u %u\n",
                  tomoyo_mac_keywords
                  [tomoyo_pnnn2mac[r->param.mkdev.operation]],
                  r->param.mkdev.filename->name,
                  r->param.mkdev.mode, r->param.mkdev.major,
                  r->param.mkdev.minor);
 }
 
 /**
  * tomoyo_audit_path_number_log - Audit path/number request log.
  *
  * @r: Pointer to "struct tomoyo_request_info".
  *
  * Returns 0 on success, negative value otherwise.
  */
 static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r)
 {
     const u8 type = r->param.path_number.operation;
     u8 radix;
     char buffer[64];
 
     switch (type) {
     case TOMOYO_TYPE_CREATE:
     case TOMOYO_TYPE_MKDIR:
     case TOMOYO_TYPE_MKFIFO:
     case TOMOYO_TYPE_MKSOCK:
     case TOMOYO_TYPE_CHMOD:
         radix = TOMOYO_VALUE_TYPE_OCTAL;
         break;
     case TOMOYO_TYPE_IOCTL:
         radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
         break;
     default:
         radix = TOMOYO_VALUE_TYPE_DECIMAL;
         break;
     }
     tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number,
                radix);
     return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
                  [tomoyo_pn2mac[type]],
                  r->param.path_number.filename->name, buffer);
 }
 
 /**
  * tomoyo_check_path_acl - Check permission for path operation.
  *
  * @r:   Pointer to "struct tomoyo_request_info".
  * @ptr: Pointer to "struct tomoyo_acl_info".
  *
  * Returns true if granted, false otherwise.
  *
  * To be able to use wildcard for domain transition, this function sets
  * matching entry on success. Since the caller holds tomoyo_read_lock(),
  * it is safe to set matching entry.
  */
 static bool tomoyo_check_path_acl(struct tomoyo_request_info *r,
                   const struct tomoyo_acl_info *ptr)
 {
     const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl),
                              head);
 
     if (acl->perm & (1 << r->param.path.operation)) {
         r->param.path.matched_path =
             tomoyo_compare_name_union(r->param.path.filename,
                           &acl->name);
         return r->param.path.matched_path != NULL;
     }
     return false;
 }
 
 /**
  * tomoyo_check_path_number_acl - Check permission for path number operation.
  *
  * @r:   Pointer to "struct tomoyo_request_info".
  * @ptr: Pointer to "struct tomoyo_acl_info".
  *
  * Returns true if granted, false otherwise.
  */
 static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r,
                      const struct tomoyo_acl_info *ptr)
 {
     const struct tomoyo_path_number_acl *acl =
         container_of(ptr, typeof(*acl), head);
 
     return (acl->perm & (1 << r->param.path_number.operation)) &&
         tomoyo_compare_number_union(r->param.path_number.number,
                         &acl->number) &&
         tomoyo_compare_name_union(r->param.path_number.filename,
                       &acl->name);
 }
 
 /**
  * tomoyo_check_path2_acl - Check permission for path path operation.
  *
  * @r:   Pointer to "struct tomoyo_request_info".
  * @ptr: Pointer to "struct tomoyo_acl_info".
  *
  * Returns true if granted, false otherwise.
  */
 static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r,
                    const struct tomoyo_acl_info *ptr)
 {
     const struct tomoyo_path2_acl *acl =
         container_of(ptr, typeof(*acl), head);
 
     return (acl->perm & (1 << r->param.path2.operation)) &&
         tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1)
         && tomoyo_compare_name_union(r->param.path2.filename2,
                          &acl->name2);
 }
 
 /**
  * tomoyo_check_mkdev_acl - Check permission for path number number number operation.
  *
  * @r:   Pointer to "struct tomoyo_request_info".
  * @ptr: Pointer to "struct tomoyo_acl_info".
  *
  * Returns true if granted, false otherwise.
  */
 static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r,
                    const struct tomoyo_acl_info *ptr)
 {
     const struct tomoyo_mkdev_acl *acl =
         container_of(ptr, typeof(*acl), head);
 
     return (acl->perm & (1 << r->param.mkdev.operation)) &&
         tomoyo_compare_number_union(r->param.mkdev.mode,
                         &acl->mode) &&
         tomoyo_compare_number_union(r->param.mkdev.major,
                         &acl->major) &&
         tomoyo_compare_number_union(r->param.mkdev.minor,
                         &acl->minor) &&
         tomoyo_compare_name_union(r->param.mkdev.filename,
                       &acl->name);
 }
 
 /**
  * tomoyo_same_path_acl - Check for duplicated "struct tomoyo_path_acl" entry.
  *
  * @a: Pointer to "struct tomoyo_acl_info".
  * @b: Pointer to "struct tomoyo_acl_info".
  *
  * Returns true if @a == @b except permission bits, false otherwise.
  */
 static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
                  const struct tomoyo_acl_info *b)
 {
     const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
     const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
 
     return tomoyo_same_name_union(&p1->name, &p2->name);
 }
 
 /**
  * tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry.
  *
  * @a:         Pointer to "struct tomoyo_acl_info".
  * @b:         Pointer to "struct tomoyo_acl_info".
  * @is_delete: True for @a &= ~@b, false for @a |= @b.
  *
  * Returns true if @a is empty, false otherwise.
  */
 static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
                   struct tomoyo_acl_info *b,
                   const bool is_delete)
 {
     u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
         ->perm;
     u16 perm = READ_ONCE(*a_perm);
     const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
 
     if (is_delete)
         perm &= ~b_perm;
     else
         perm |= b_perm;
     WRITE_ONCE(*a_perm, perm);
     return !perm;
 }
 
 /**
  * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
  *
  * @perm:  Permission.
  * @param: Pointer to "struct tomoyo_acl_param".
  *
  * Returns 0 on success, negative value otherwise.
  *
  * Caller holds tomoyo_read_lock().
  */
 static int tomoyo_update_path_acl(const u16 perm,
                   struct tomoyo_acl_param *param)
 {
     struct tomoyo_path_acl e = {
         .head.type = TOMOYO_TYPE_PATH_ACL,
         .perm = perm
     };
     int error;
 
     if (!tomoyo_parse_name_union(param, &e.name))
         error = -EINVAL;
     else
         error = tomoyo_update_domain(&e.head, sizeof(e), param,
                          tomoyo_same_path_acl,
                          tomoyo_merge_path_acl);
     tomoyo_put_name_union(&e.name);
     return error;
 }
 
 /**
  * tomoyo_same_mkdev_acl - Check for duplicated "struct tomoyo_mkdev_acl" entry.
  *
  * @a: Pointer to "struct tomoyo_acl_info".
  * @b: Pointer to "struct tomoyo_acl_info".
  *
  * Returns true if @a == @b except permission bits, false otherwise.
  */
 static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
                      const struct tomoyo_acl_info *b)
 {
     const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), head);
     const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), head);
 
     return tomoyo_same_name_union(&p1->name, &p2->name) &&
         tomoyo_same_number_union(&p1->mode, &p2->mode) &&
         tomoyo_same_number_union(&p1->major, &p2->major) &&
         tomoyo_same_number_union(&p1->minor, &p2->minor);
 }
 
 /**
  * tomoyo_merge_mkdev_acl - Merge duplicated "struct tomoyo_mkdev_acl" entry.
  *
  * @a:         Pointer to "struct tomoyo_acl_info".
  * @b:         Pointer to "struct tomoyo_acl_info".
  * @is_delete: True for @a &= ~@b, false for @a |= @b.
  *
  * Returns true if @a is empty, false otherwise.
  */
 static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
                    struct tomoyo_acl_info *b,
                    const bool is_delete)
 {
     u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
                      head)->perm;
     u8 perm = READ_ONCE(*a_perm);
     const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
         ->perm;
 
     if (is_delete)
         perm &= ~b_perm;
     else
         perm |= b_perm;
     WRITE_ONCE(*a_perm, perm);
     return !perm;
 }
 
 /**
  * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list.
  *
  * @perm:  Permission.
  * @param: Pointer to "struct tomoyo_acl_param".
  *
  * Returns 0 on success, negative value otherwise.
  *
  * Caller holds tomoyo_read_lock().
  */
 static int tomoyo_update_mkdev_acl(const u8 perm,
                    struct tomoyo_acl_param *param)
 {
     struct tomoyo_mkdev_acl e = {
         .head.type = TOMOYO_TYPE_MKDEV_ACL,
         .perm = perm
     };
     int error;
 
     if (!tomoyo_parse_name_union(param, &e.name) ||
         !tomoyo_parse_number_union(param, &e.mode) ||
         !tomoyo_parse_number_union(param, &e.major) ||
         !tomoyo_parse_number_union(param, &e.minor))
         error = -EINVAL;
     else
         error = tomoyo_update_domain(&e.head, sizeof(e), param,
                          tomoyo_same_mkdev_acl,
                          tomoyo_merge_mkdev_acl);
     tomoyo_put_name_union(&e.name);
     tomoyo_put_number_union(&e.mode);
     tomoyo_put_number_union(&e.major);
     tomoyo_put_number_union(&e.minor);
     return error;
 }
 
 /**
  * tomoyo_same_path2_acl - Check for duplicated "struct tomoyo_path2_acl" entry.
  *
  * @a: Pointer to "struct tomoyo_acl_info".
  * @b: Pointer to "struct tomoyo_acl_info".
  *
  * Returns true if @a == @b except permission bits, false otherwise.
  */
 static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
                   const struct tomoyo_acl_info *b)
 {
     const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
     const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
 
     return tomoyo_same_name_union(&p1->name1, &p2->name1) &&
         tomoyo_same_name_union(&p1->name2, &p2->name2);
 }
 
 /**
  * tomoyo_merge_path2_acl - Merge duplicated "struct tomoyo_path2_acl" entry.
  *
  * @a:         Pointer to "struct tomoyo_acl_info".
  * @b:         Pointer to "struct tomoyo_acl_info".
  * @is_delete: True for @a &= ~@b, false for @a |= @b.
  *
  * Returns true if @a is empty, false otherwise.
  */
 static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
                    struct tomoyo_acl_info *b,
                    const bool is_delete)
 {
     u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
         ->perm;
     u8 perm = READ_ONCE(*a_perm);
     const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
 
     if (is_delete)
         perm &= ~b_perm;
     else
         perm |= b_perm;
     WRITE_ONCE(*a_perm, perm);
     return !perm;
 }
 
 /**
  * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
  *
  * @perm:  Permission.
  * @param: Pointer to "struct tomoyo_acl_param".
  *
  * Returns 0 on success, negative value otherwise.
  *
  * Caller holds tomoyo_read_lock().
  */
 static int tomoyo_update_path2_acl(const u8 perm,
                    struct tomoyo_acl_param *param)
 {
     struct tomoyo_path2_acl e = {
         .head.type = TOMOYO_TYPE_PATH2_ACL,
         .perm = perm
     };
     int error;
 
     if (!tomoyo_parse_name_union(param, &e.name1) ||
         !tomoyo_parse_name_union(param, &e.name2))
         error = -EINVAL;
     else
         error = tomoyo_update_domain(&e.head, sizeof(e), param,
                          tomoyo_same_path2_acl,
                          tomoyo_merge_path2_acl);
     tomoyo_put_name_union(&e.name1);
     tomoyo_put_name_union(&e.name2);
     return error;
 }
 
 /**
  * tomoyo_path_permission - Check permission for single path operation.
  *
  * @r:         Pointer to "struct tomoyo_request_info".
  * @operation: Type of operation.
  * @filename:  Filename to check.
  *
  * Returns 0 on success, negative value otherwise.
  *
  * Caller holds tomoyo_read_lock().
  */
 static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
                   const struct tomoyo_path_info *filename)
 {
     int error;
 
     r->type = tomoyo_p2mac[operation];
     r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
     if (r->mode == TOMOYO_CONFIG_DISABLED)
         return 0;
     r->param_type = TOMOYO_TYPE_PATH_ACL;
     r->param.path.filename = filename;
     r->param.path.operation = operation;
     do {
         tomoyo_check_acl(r, tomoyo_check_path_acl);
         error = tomoyo_audit_path_log(r);
     } while (error == TOMOYO_RETRY_REQUEST);
     return error;
 }
 
 /**
  * tomoyo_execute_permission - Check permission for execute operation.
  *
  * @r:         Pointer to "struct tomoyo_request_info".
  * @filename:  Filename to check.
  *
  * Returns 0 on success, negative value otherwise.
  *
  * Caller holds tomoyo_read_lock().
  */
 int tomoyo_execute_permission(struct tomoyo_request_info *r,
                   const struct tomoyo_path_info *filename)
 {
     /*
      * Unlike other permission checks, this check is done regardless of
      * profile mode settings in order to check for domain transition
      * preference.
      */
     r->type = TOMOYO_MAC_FILE_EXECUTE;
     r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
     r->param_type = TOMOYO_TYPE_PATH_ACL;
     r->param.path.filename = filename;
     r->param.path.operation = TOMOYO_TYPE_EXECUTE;
     tomoyo_check_acl(r, tomoyo_check_path_acl);
     r->ee->transition = r->matched_acl && r->matched_acl->cond ?
         r->matched_acl->cond->transit : NULL;
     if (r->mode != TOMOYO_CONFIG_DISABLED)
         return tomoyo_audit_path_log(r);
     return 0;
 }
 
 /**
  * tomoyo_same_path_number_acl - Check for duplicated "struct tomoyo_path_number_acl" entry.
  *
  * @a: Pointer to "struct tomoyo_acl_info".
  * @b: Pointer to "struct tomoyo_acl_info".
  *
  * Returns true if @a == @b except permission bits, false otherwise.
  */
 static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
                     const struct tomoyo_acl_info *b)
 {
     const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1),
                                    head);
     const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
                                    head);
 
     return tomoyo_same_name_union(&p1->name, &p2->name) &&
         tomoyo_same_number_union(&p1->number, &p2->number);
 }
 
 /**
  * tomoyo_merge_path_number_acl - Merge duplicated "struct tomoyo_path_number_acl" entry.
  *
  * @a:         Pointer to "struct tomoyo_acl_info".
  * @b:         Pointer to "struct tomoyo_acl_info".
  * @is_delete: True for @a &= ~@b, false for @a |= @b.
  *
  * Returns true if @a is empty, false otherwise.
  */
 static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
                      struct tomoyo_acl_info *b,
                      const bool is_delete)
 {
     u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
                       head)->perm;
     u8 perm = READ_ONCE(*a_perm);
     const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
         ->perm;
 
     if (is_delete)
         perm &= ~b_perm;
     else
         perm |= b_perm;
     WRITE_ONCE(*a_perm, perm);
     return !perm;
 }
 
 /**
  * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
  *
  * @perm:  Permission.
  * @param: Pointer to "struct tomoyo_acl_param".
  *
  * Returns 0 on success, negative value otherwise.
  */
 static int tomoyo_update_path_number_acl(const u8 perm,
                      struct tomoyo_acl_param *param)
 {
     struct tomoyo_path_number_acl e = {
         .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
         .perm = perm
     };
     int error;
 
     if (!tomoyo_parse_name_union(param, &e.name) ||
         !tomoyo_parse_number_union(param, &e.number))
         error = -EINVAL;
     else
         error = tomoyo_update_domain(&e.head, sizeof(e), param,
                          tomoyo_same_path_number_acl,
                          tomoyo_merge_path_number_acl);
     tomoyo_put_name_union(&e.name);
     tomoyo_put_number_union(&e.number);
     return error;
 }
 
 /**
  * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
  *
  * @type:   Type of operation.
  * @path:   Pointer to "struct path".
  * @number: Number.
  *
  * Returns 0 on success, negative value otherwise.
  */
 int tomoyo_path_number_perm(const u8 type, const struct path *path,
                 unsigned long number)
 {
     struct tomoyo_request_info r;
     struct tomoyo_obj_info obj = {
         .path1 = { .mnt = path->mnt, .dentry = path->dentry },
     };
     int error = -ENOMEM;
     struct tomoyo_path_info buf;
     int idx;
 
     if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
         == TOMOYO_CONFIG_DISABLED || !path->dentry)
         return 0;
     idx = tomoyo_read_lock();
     if (!tomoyo_get_realpath(&buf, path))
         goto out;
     r.obj = &obj;
     if (type == TOMOYO_TYPE_MKDIR)
         tomoyo_add_slash(&buf);
     r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
     r.param.path_number.operation = type;
     r.param.path_number.filename = &buf;
     r.param.path_number.number = number;
     do {
         tomoyo_check_acl(&r, tomoyo_check_path_number_acl);
         error = tomoyo_audit_path_number_log(&r);
     } while (error == TOMOYO_RETRY_REQUEST);
     kfree(buf.name);
  out:
     tomoyo_read_unlock(idx);
     if (r.mode != TOMOYO_CONFIG_ENFORCING)
         error = 0;
     return error;
 }
 
 /**
  * tomoyo_check_open_permission - Check permission for "read" and "write".
  *
  * @domain: Pointer to "struct tomoyo_domain_info".
  * @path:   Pointer to "struct path".
  * @flag:   Flags for open().
  *
  * Returns 0 on success, negative value otherwise.
  */
 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
                  const struct path *path, const int flag)
 {
     const u8 acc_mode = ACC_MODE(flag);
     int error = 0;
     struct tomoyo_path_info buf;
     struct tomoyo_request_info r;
     struct tomoyo_obj_info obj = {
         .path1 = { .mnt = path->mnt, .dentry = path->dentry },
     };
     int idx;
 
     buf.name = NULL;
     r.mode = TOMOYO_CONFIG_DISABLED;
     idx = tomoyo_read_lock();
     if (acc_mode &&
         tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
         != TOMOYO_CONFIG_DISABLED) {
         if (!tomoyo_get_realpath(&buf, path)) {
             error = -ENOMEM;
             goto out;
         }
         r.obj = &obj;
         if (acc_mode & MAY_READ)
             error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ,
                                &buf);
         if (!error && (acc_mode & MAY_WRITE))
             error = tomoyo_path_permission(&r, (flag & O_APPEND) ?
                                TOMOYO_TYPE_APPEND :
                                TOMOYO_TYPE_WRITE,
                                &buf);
     }
  out:
     kfree(buf.name);
     tomoyo_read_unlock(idx);
     if (r.mode != TOMOYO_CONFIG_ENFORCING)
         error = 0;
     return error;
 }
 
 /**
  * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "chroot" and "unmount".
  *
  * @operation: Type of operation.
  * @path:      Pointer to "struct path".
  * @target:    Symlink's target if @operation is TOMOYO_TYPE_SYMLINK,
  *             NULL otherwise.
  *
  * Returns 0 on success, negative value otherwise.
  */
 int tomoyo_path_perm(const u8 operation, const struct path *path, const char *target)
 {
     struct tomoyo_request_info r;
     struct tomoyo_obj_info obj = {
         .path1 = { .mnt = path->mnt, .dentry = path->dentry },
     };
     int error;
     struct tomoyo_path_info buf;
     bool is_enforce;
     struct tomoyo_path_info symlink_target;
     int idx;
 
     if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
         == TOMOYO_CONFIG_DISABLED)
         return 0;
     is_enforce = (r.mode == TOMOYO_CONFIG_ENFORCING);
     error = -ENOMEM;
     buf.name = NULL;
     idx = tomoyo_read_lock();
     if (!tomoyo_get_realpath(&buf, path))
         goto out;
     r.obj = &obj;
     switch (operation) {
     case TOMOYO_TYPE_RMDIR:
     case TOMOYO_TYPE_CHROOT:
         tomoyo_add_slash(&buf);
         break;
     case TOMOYO_TYPE_SYMLINK:
         symlink_target.name = tomoyo_encode(target);
         if (!symlink_target.name)
             goto out;
         tomoyo_fill_path_info(&symlink_target);
         obj.symlink_target = &symlink_target;
         break;
     }
     error = tomoyo_path_permission(&r, operation, &buf);
     if (operation == TOMOYO_TYPE_SYMLINK)
         kfree(symlink_target.name);
  out:
     kfree(buf.name);
     tomoyo_read_unlock(idx);
     if (!is_enforce)
         error = 0;
     return error;
 }
 
 /**
  * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar".
  *
  * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
  * @path:      Pointer to "struct path".
  * @mode:      Create mode.
  * @dev:       Device number.
  *
  * Returns 0 on success, negative value otherwise.
  */
 int tomoyo_mkdev_perm(const u8 operation, const struct path *path,
               const unsigned int mode, unsigned int dev)
 {
     struct tomoyo_request_info r;
     struct tomoyo_obj_info obj = {
         .path1 = { .mnt = path->mnt, .dentry = path->dentry },
     };
     int error = -ENOMEM;
     struct tomoyo_path_info buf;
     int idx;
 
     if (tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
         == TOMOYO_CONFIG_DISABLED)
         return 0;
     idx = tomoyo_read_lock();
     error = -ENOMEM;
     if (tomoyo_get_realpath(&buf, path)) {
         r.obj = &obj;
         dev = new_decode_dev(dev);
         r.param_type = TOMOYO_TYPE_MKDEV_ACL;
         r.param.mkdev.filename = &buf;
         r.param.mkdev.operation = operation;
         r.param.mkdev.mode = mode;
         r.param.mkdev.major = MAJOR(dev);
         r.param.mkdev.minor = MINOR(dev);
         tomoyo_check_acl(&r, tomoyo_check_mkdev_acl);
         error = tomoyo_audit_mkdev_log(&r);
         kfree(buf.name);
     }
     tomoyo_read_unlock(idx);
     if (r.mode != TOMOYO_CONFIG_ENFORCING)
         error = 0;
     return error;
 }
 
 /**
  * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
  *
  * @operation: Type of operation.
  * @path1:      Pointer to "struct path".
  * @path2:      Pointer to "struct path".
  *
  * Returns 0 on success, negative value otherwise.
  */
 int tomoyo_path2_perm(const u8 operation, const struct path *path1,
               const struct path *path2)
 {
     int error = -ENOMEM;
     struct tomoyo_path_info buf1;
     struct tomoyo_path_info buf2;
     struct tomoyo_request_info r;
     struct tomoyo_obj_info obj = {
         .path1 = { .mnt = path1->mnt, .dentry = path1->dentry },
         .path2 = { .mnt = path2->mnt, .dentry = path2->dentry }
     };
     int idx;
 
     if (tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
         == TOMOYO_CONFIG_DISABLED)
         return 0;
     buf1.name = NULL;
     buf2.name = NULL;
     idx = tomoyo_read_lock();
     if (!tomoyo_get_realpath(&buf1, path1) ||
         !tomoyo_get_realpath(&buf2, path2))
         goto out;
     switch (operation) {
     case TOMOYO_TYPE_RENAME:
     case TOMOYO_TYPE_LINK:
         if (!d_is_dir(path1->dentry))
             break;
         fallthrough;
     case TOMOYO_TYPE_PIVOT_ROOT:
         tomoyo_add_slash(&buf1);
         tomoyo_add_slash(&buf2);
         break;
     }
     r.obj = &obj;
     r.param_type = TOMOYO_TYPE_PATH2_ACL;
     r.param.path2.operation = operation;
     r.param.path2.filename1 = &buf1;
     r.param.path2.filename2 = &buf2;
     do {
         tomoyo_check_acl(&r, tomoyo_check_path2_acl);
         error = tomoyo_audit_path2_log(&r);
     } while (error == TOMOYO_RETRY_REQUEST);
  out:
     kfree(buf1.name);
     kfree(buf2.name);
     tomoyo_read_unlock(idx);
     if (r.mode != TOMOYO_CONFIG_ENFORCING)
         error = 0;
     return error;
 }
 
 /**
  * tomoyo_same_mount_acl - Check for duplicated "struct tomoyo_mount_acl" entry.
  *
  * @a: Pointer to "struct tomoyo_acl_info".
  * @b: Pointer to "struct tomoyo_acl_info".
  *
  * Returns true if @a == @b, false otherwise.
  */
 static bool tomoyo_same_mount_acl(const struct tomoyo_acl_info *a,
                   const struct tomoyo_acl_info *b)
 {
     const struct tomoyo_mount_acl *p1 = container_of(a, typeof(*p1), head);
     const struct tomoyo_mount_acl *p2 = container_of(b, typeof(*p2), head);
 
     return tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) &&
         tomoyo_same_name_union(&p1->dir_name, &p2->dir_name) &&
         tomoyo_same_name_union(&p1->fs_type, &p2->fs_type) &&
         tomoyo_same_number_union(&p1->flags, &p2->flags);
 }
 
 /**
  * tomoyo_update_mount_acl - Write "struct tomoyo_mount_acl" list.
  *
  * @param: Pointer to "struct tomoyo_acl_param".
  *
  * Returns 0 on success, negative value otherwise.
  *
  * Caller holds tomoyo_read_lock().
  */
 static int tomoyo_update_mount_acl(struct tomoyo_acl_param *param)
 {
     struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL };
     int error;
 
     if (!tomoyo_parse_name_union(param, &e.dev_name) ||
         !tomoyo_parse_name_union(param, &e.dir_name) ||
         !tomoyo_parse_name_union(param, &e.fs_type) ||
         !tomoyo_parse_number_union(param, &e.flags))
         error = -EINVAL;
     else
         error = tomoyo_update_domain(&e.head, sizeof(e), param,
                          tomoyo_same_mount_acl, NULL);
     tomoyo_put_name_union(&e.dev_name);
     tomoyo_put_name_union(&e.dir_name);
     tomoyo_put_name_union(&e.fs_type);
     tomoyo_put_number_union(&e.flags);
     return error;
 }
 
 /**
  * tomoyo_write_file - Update file related list.
  *
  * @param: Pointer to "struct tomoyo_acl_param".
  *
  * Returns 0 on success, negative value otherwise.
  *
  * Caller holds tomoyo_read_lock().
  */
 int tomoyo_write_file(struct tomoyo_acl_param *param)
 {
     u16 perm = 0;
     u8 type;
     const char *operation = tomoyo_read_token(param);
 
     for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++)
         if (tomoyo_permstr(operation, tomoyo_path_keyword[type]))
             perm |= 1 << type;
     if (perm)
         return tomoyo_update_path_acl(perm, param);
     for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++)
         if (tomoyo_permstr(operation,
                    tomoyo_mac_keywords[tomoyo_pp2mac[type]]))
             perm |= 1 << type;
     if (perm)
         return tomoyo_update_path2_acl(perm, param);
     for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++)
         if (tomoyo_permstr(operation,
                    tomoyo_mac_keywords[tomoyo_pn2mac[type]]))
             perm |= 1 << type;
     if (perm)
         return tomoyo_update_path_number_acl(perm, param);
     for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++)
         if (tomoyo_permstr(operation,
                    tomoyo_mac_keywords[tomoyo_pnnn2mac[type]]))
             perm |= 1 << type;
     if (perm)
         return tomoyo_update_mkdev_acl(perm, param);
     if (tomoyo_permstr(operation,
                tomoyo_mac_keywords[TOMOYO_MAC_FILE_MOUNT]))
         return tomoyo_update_mount_acl(param);
     return -EINVAL;
 }

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