diff options
| -rw-r--r-- | Documentation/ABI/testing/ima_policy | 4 | ||||
| -rw-r--r-- | security/integrity/ima/ima_policy.c | 22 |
2 files changed, 24 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy index de16de3f148d..f1c5cc9d17a8 100644 --- a/Documentation/ABI/testing/ima_policy +++ b/Documentation/ABI/testing/ima_policy @@ -19,7 +19,8 @@ Description: action: measure | dont_measure | appraise | dont_appraise | audit condition:= base | lsm [option] - base: [[func=] [mask=] [fsmagic=] [uid=] [fowner]] + base: [[func=] [mask=] [fsmagic=] [fsuuid=] [uid=] + [fowner]] lsm: [[subj_user=] [subj_role=] [subj_type=] [obj_user=] [obj_role=] [obj_type=]] option: [[appraise_type=]] @@ -27,6 +28,7 @@ Description: base: func:= [BPRM_CHECK][MMAP_CHECK][FILE_CHECK][MODULE_CHECK] mask:= [MAY_READ] [MAY_WRITE] [MAY_APPEND] [MAY_EXEC] fsmagic:= hex value + fsuuid:= file system UUID (e.g 8bcbe394-4f13-4144-be8e-5aa9ea2ce2f6) uid:= decimal value fowner:=decimal value lsm: are LSM specific diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 4adcd0f8c1dd..23f49e37a957 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -16,6 +16,7 @@ #include <linux/magic.h> #include <linux/parser.h> #include <linux/slab.h> +#include <linux/genhd.h> #include "ima.h" @@ -25,6 +26,7 @@ #define IMA_FSMAGIC 0x0004 #define IMA_UID 0x0008 #define IMA_FOWNER 0x0010 +#define IMA_FSUUID 0x0020 #define UNKNOWN 0 #define MEASURE 0x0001 /* same as IMA_MEASURE */ @@ -45,6 +47,7 @@ struct ima_rule_entry { enum ima_hooks func; int mask; unsigned long fsmagic; + u8 fsuuid[16]; kuid_t uid; kuid_t fowner; struct { @@ -172,6 +175,9 @@ static bool ima_match_rules(struct ima_rule_entry *rule, if ((rule->flags & IMA_FSMAGIC) && rule->fsmagic != inode->i_sb->s_magic) return false; + if ((rule->flags & IMA_FSUUID) && + memcmp(rule->fsuuid, inode->i_sb->s_uuid, sizeof(rule->fsuuid))) + return false; if ((rule->flags & IMA_UID) && !uid_eq(rule->uid, cred->uid)) return false; if ((rule->flags & IMA_FOWNER) && !uid_eq(rule->fowner, inode->i_uid)) @@ -346,7 +352,7 @@ enum { Opt_obj_user, Opt_obj_role, Opt_obj_type, Opt_subj_user, Opt_subj_role, Opt_subj_type, Opt_func, Opt_mask, Opt_fsmagic, Opt_uid, Opt_fowner, - Opt_appraise_type + Opt_appraise_type, Opt_fsuuid }; static match_table_t policy_tokens = { @@ -364,6 +370,7 @@ static match_table_t policy_tokens = { {Opt_func, "func=%s"}, {Opt_mask, "mask=%s"}, {Opt_fsmagic, "fsmagic=%s"}, + {Opt_fsuuid, "fsuuid=%s"}, {Opt_uid, "uid=%s"}, {Opt_fowner, "fowner=%s"}, {Opt_appraise_type, "appraise_type=%s"}, @@ -519,6 +526,19 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) if (!result) entry->flags |= IMA_FSMAGIC; break; + case Opt_fsuuid: + ima_log_string(ab, "fsuuid", args[0].from); + + if (memchr_inv(entry->fsuuid, 0x00, + sizeof(entry->fsuuid))) { + result = -EINVAL; + break; + } + + part_pack_uuid(args[0].from, entry->fsuuid); + entry->flags |= IMA_FSUUID; + result = 0; + break; case Opt_uid: ima_log_string(ab, "uid", args[0].from); |