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revert: 1320a4052e ("audit: trigger accompanying records when no rules present")

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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: 1320a4052e ("audit: trigger accompanying records when no rules present")
Reported-by: j2468h@googlemail.com
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore 2020-07-28 15:33:21 -04:00
parent 9d44a121c5
commit 8ac68dc455
3 changed files with 3 additions and 9 deletions
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1
kernel/audit.c
View File

@ -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);

8
kernel/audit.h
View File

@ -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);

3
kernel/auditsc.c
View File

@ -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 */