diff options
Diffstat (limited to 'security/tomoyo/file.c')
| -rw-r--r-- | security/tomoyo/file.c | 208 |
1 files changed, 172 insertions, 36 deletions
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c index 33238028807..4259e0a136d 100644 --- a/security/tomoyo/file.c +++ b/security/tomoyo/file.c @@ -49,6 +49,9 @@ const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { [TOMOYO_TYPE_CHGRP] = "chgrp", }; +/* + * 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, @@ -63,17 +66,27 @@ static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = { [TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT, }; +/* + * Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index". + */ static 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". + */ static 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". + */ static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE, [TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR, @@ -85,41 +98,76 @@ static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = { [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) { - if (!ptr) - return; - if (ptr->is_group) - tomoyo_put_group(ptr->group); - else - tomoyo_put_name(ptr->filename); + 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->is_group) + 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) { - if (ptr && ptr->is_group) - tomoyo_put_group(ptr->group); + 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->is_group) + 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) @@ -247,6 +295,18 @@ static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) 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) { @@ -261,6 +321,14 @@ static bool tomoyo_check_path_acl(struct tomoyo_request_info *r, 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) { @@ -273,6 +341,14 @@ static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r, &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) { @@ -284,8 +360,16 @@ static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r, &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_acl_info *ptr) { const struct tomoyo_mkdev_acl *acl = container_of(ptr, typeof(*acl), head); @@ -300,13 +384,20 @@ static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r, &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_acl_head(&p1->head, &p2->head) && - tomoyo_same_name_union(&p1->name, &p2->name); + return tomoyo_same_name_union(&p1->name, &p2->name); } /** @@ -364,23 +455,37 @@ static int tomoyo_update_path_acl(const u8 type, const char *filename, 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_acl_head(&p1->head, &p2->head) - && 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); + 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) + struct tomoyo_acl_info *b, + const bool is_delete) { u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl, head)->perm; @@ -411,9 +516,9 @@ static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, * Caller holds tomoyo_read_lock(). */ static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, - char *mode, char *major, char *minor, - struct tomoyo_domain_info * const - domain, const bool is_delete) + char *mode, char *major, char *minor, + struct tomoyo_domain_info * const domain, + const bool is_delete) { struct tomoyo_mkdev_acl e = { .head.type = TOMOYO_TYPE_MKDEV_ACL, @@ -436,16 +541,32 @@ static int tomoyo_update_mkdev_acl(const u8 type, const char *filename, 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_acl_head(&p1->head, &p2->head) - && tomoyo_same_name_union(&p1->name1, &p2->name1) - && tomoyo_same_name_union(&p1->name2, &p2->name2); + 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) @@ -532,6 +653,14 @@ int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation, return error; } +/** + * 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) { @@ -539,11 +668,19 @@ static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, head); const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), head); - return tomoyo_same_acl_head(&p1->head, &p2->head) - && tomoyo_same_name_union(&p1->name, &p2->name) - && tomoyo_same_number_union(&p1->number, &p2->number); + 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) @@ -575,8 +712,7 @@ static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, static int tomoyo_update_path_number_acl(const u8 type, const char *filename, char *number, struct tomoyo_domain_info * const - domain, - const bool is_delete) + domain, const bool is_delete) { struct tomoyo_path_number_acl e = { .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL, @@ -737,7 +873,7 @@ int tomoyo_path_perm(const u8 operation, struct path *path) * Returns 0 on success, negative value otherwise. */ int tomoyo_mkdev_perm(const u8 operation, struct path *path, - const unsigned int mode, unsigned int dev) + const unsigned int mode, unsigned int dev) { struct tomoyo_request_info r; int error = -ENOMEM; |