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| author | Paul Moore <paul@paul-moore.com> | 2020-07-28 22:33:21 +0300 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2020-07-29 17:00:36 +0300 |
| commit | 8ac68dc455d9d18241d44b96800d73229029ed34 (patch) | |
| tree | d4b0c64dd9d0fca1eb0bc6a925ea1ef89c5ee80e /kernel | |
| parent | 9d44a121c5a79bc8a9d67c058456bd52a83c79e7 (diff) | |
| download | linux-8ac68dc455d9d18241d44b96800d73229029ed34.tar.xz | |
revert: 1320a4052ea1 ("audit: trigger accompanying records when no rules present")
Unfortunately the commit listed in the subject line above failed
to ensure that the task's audit_context was properly initialized/set
before enabling the "accompanying records". Depending on the
situation, the resulting audit_context could have invalid values in
some of it's fields which could cause a kernel panic/oops when the
task/syscall exists and the audit records are generated.
We will revisit the original patch, with the necessary fixes, in a
future kernel but right now we just want to fix the kernel panic
with the least amount of added risk.
Cc: stable@vger.kernel.org
Fixes: 1320a4052ea1 ("audit: trigger accompanying records when no rules present")
Reported-by: j2468h@googlemail.com
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/audit.c | 1 | ||||
| -rw-r--r-- | kernel/audit.h | 8 | ||||
| -rw-r--r-- | kernel/auditsc.c | 3 |
3 files changed, 3 insertions, 9 deletions
diff --git a/kernel/audit.c b/kernel/audit.c index e33460e01b3b..9bf2b08b051f 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1848,7 +1848,6 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, } audit_get_stamp(ab->ctx, &t, &serial); - audit_clear_dummy(ab->ctx); audit_log_format(ab, "audit(%llu.%03lu:%u): ", (unsigned long long)t.tv_sec, t.tv_nsec/1000000, serial); diff --git a/kernel/audit.h b/kernel/audit.h index f0233dc40b17..ddc22878433d 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -290,13 +290,6 @@ extern int audit_signal_info_syscall(struct task_struct *t); extern void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx); extern struct list_head *audit_killed_trees(void); - -static inline void audit_clear_dummy(struct audit_context *ctx) -{ - if (ctx) - ctx->dummy = 0; -} - #else /* CONFIG_AUDITSYSCALL */ #define auditsc_get_stamp(c, t, s) 0 #define audit_put_watch(w) {} @@ -330,7 +323,6 @@ static inline int audit_signal_info_syscall(struct task_struct *t) } #define audit_filter_inodes(t, c) AUDIT_DISABLED -#define audit_clear_dummy(c) {} #endif /* CONFIG_AUDITSYSCALL */ extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len); diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 468a23390457..fd840c40abf7 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1417,6 +1417,9 @@ static void audit_log_proctitle(void) struct audit_context *context = audit_context(); struct audit_buffer *ab; + if (!context || context->dummy) + return; + ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE); if (!ab) return; /* audit_panic or being filtered */ |