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authorLinus Torvalds <torvalds@linux-foundation.org>2019-11-30 17:01:48 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-11-30 17:01:48 -0800
commit3b805ca177a24ff78b466ca73febe8466c67ea61 (patch)
tree3e102b114529a981c65fa571ec6b3471371b012d
parentba75082efc18ced6def42e8f85c494aa2578760e (diff)
parentc34c78dfc1fc68a1f5403f996de8ca62f298d7b2 (diff)
Merge tag 'audit-pr-20191126' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
Pull audit updates from Paul Moore: "Audit is back for v5.5, albeit with only two patches: - Allow for the auditing of suspicious O_CREAT usage via the new AUDIT_ANOM_CREAT record. - Remove a redundant if-conditional check found during code analysis. It's a minor change, but when the pull request is only two patches long, you need filler in the pull request email" [ Heh on the pull request filler. I wish more people tried to write better pull request messages, even if maybe it's not worth it for the trivial cases ;^) - Linus ] * tag 'audit-pr-20191126' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit: audit: remove redundant condition check in kauditd_thread() audit: Report suspicious O_CREAT usage
-rw-r--r--fs/namei.c8
-rw-r--r--include/linux/audit.h5
-rw-r--r--include/uapi/linux/audit.h1
-rw-r--r--kernel/audit.c15
4 files changed, 18 insertions, 11 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 671c3c1a3425..2dda552bcf7a 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -925,7 +925,7 @@ static inline int may_follow_link(struct nameidata *nd)
return -ECHILD;
audit_inode(nd->name, nd->stack[0].link.dentry, 0);
- audit_log_link_denied("follow_link");
+ audit_log_path_denied(AUDIT_ANOM_LINK, "follow_link");
return -EACCES;
}
@@ -993,7 +993,7 @@ static int may_linkat(struct path *link)
if (safe_hardlink_source(inode) || inode_owner_or_capable(inode))
return 0;
- audit_log_link_denied("linkat");
+ audit_log_path_denied(AUDIT_ANOM_LINK, "linkat");
return -EPERM;
}
@@ -1031,6 +1031,10 @@ static int may_create_in_sticky(struct dentry * const dir,
(dir->d_inode->i_mode & 0020 &&
((sysctl_protected_fifos >= 2 && S_ISFIFO(inode->i_mode)) ||
(sysctl_protected_regular >= 2 && S_ISREG(inode->i_mode))))) {
+ const char *operation = S_ISFIFO(inode->i_mode) ?
+ "sticky_create_fifo" :
+ "sticky_create_regular";
+ audit_log_path_denied(AUDIT_ANOM_CREAT, operation);
return -EACCES;
}
return 0;
diff --git a/include/linux/audit.h b/include/linux/audit.h
index aee3dc9eb378..f9ceae57ca8d 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -156,7 +156,8 @@ extern void audit_log_d_path(struct audit_buffer *ab,
const struct path *path);
extern void audit_log_key(struct audit_buffer *ab,
char *key);
-extern void audit_log_link_denied(const char *operation);
+extern void audit_log_path_denied(int type,
+ const char *operation);
extern void audit_log_lost(const char *message);
extern int audit_log_task_context(struct audit_buffer *ab);
@@ -217,7 +218,7 @@ static inline void audit_log_d_path(struct audit_buffer *ab,
{ }
static inline void audit_log_key(struct audit_buffer *ab, char *key)
{ }
-static inline void audit_log_link_denied(const char *string)
+static inline void audit_log_path_denied(int type, const char *operation)
{ }
static inline int audit_log_task_context(struct audit_buffer *ab)
{
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index c89c6495983d..3ad935527177 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -143,6 +143,7 @@
#define AUDIT_ANOM_PROMISCUOUS 1700 /* Device changed promiscuous mode */
#define AUDIT_ANOM_ABEND 1701 /* Process ended abnormally */
#define AUDIT_ANOM_LINK 1702 /* Suspicious use of file links */
+#define AUDIT_ANOM_CREAT 1703 /* Suspicious file creation */
#define AUDIT_INTEGRITY_DATA 1800 /* Data integrity verification */
#define AUDIT_INTEGRITY_METADATA 1801 /* Metadata integrity verification */
#define AUDIT_INTEGRITY_STATUS 1802 /* Integrity enable status */
diff --git a/kernel/audit.c b/kernel/audit.c
index da8dc0db5bd3..8e09f0f55b4b 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -830,7 +830,7 @@ static int kauditd_thread(void *dummy)
rc = kauditd_send_queue(sk, portid,
&audit_hold_queue, UNICAST_RETRIES,
NULL, kauditd_rehold_skb);
- if (ac && rc < 0) {
+ if (rc < 0) {
sk = NULL;
auditd_reset(ac);
goto main_queue;
@@ -840,7 +840,7 @@ static int kauditd_thread(void *dummy)
rc = kauditd_send_queue(sk, portid,
&audit_retry_queue, UNICAST_RETRIES,
NULL, kauditd_hold_skb);
- if (ac && rc < 0) {
+ if (rc < 0) {
sk = NULL;
auditd_reset(ac);
goto main_queue;
@@ -2155,18 +2155,19 @@ void audit_log_task_info(struct audit_buffer *ab)
EXPORT_SYMBOL(audit_log_task_info);
/**
- * audit_log_link_denied - report a link restriction denial
- * @operation: specific link operation
+ * audit_log_path_denied - report a path restriction denial
+ * @type: audit message type (AUDIT_ANOM_LINK, AUDIT_ANOM_CREAT, etc)
+ * @operation: specific operation name
*/
-void audit_log_link_denied(const char *operation)
+void audit_log_path_denied(int type, const char *operation)
{
struct audit_buffer *ab;
if (!audit_enabled || audit_dummy_context())
return;
- /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
- ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_LINK);
+ /* Generate log with subject, operation, outcome. */
+ ab = audit_log_start(audit_context(), GFP_KERNEL, type);
if (!ab)
return;
audit_log_format(ab, "op=%s", operation);