The patch titled
fix bogus reporting of signals by audit
has been added to the -mm tree. Its filename is
fix-bogus-reporting-of-signals-by-audit.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: fix bogus reporting of signals by audit
From: Al Viro <viro@xxxxxxxxxxxxxxxx>
Async signals should not be reported as sent by current in audit log. As
it is, we call audit_signal_info() too early in check_kill_permission().
Note that check_kill_permission() has that test already - it needs to know
if it should apply current-based permission checks. So the solution is to
move the call of audit_signal_info() between those.
Bogosity in question is easily reproduced - add a rule watching for e.g.
kill(2) from specific process (so that audit_signal_info() would not
short-circuit to nothing), say load_policy, watch the bogus OBJ_PID entry
in audit logs claiming that write(2) on selinuxfs file issued by
load_policy(8) had somehow managed to send a signal to syslogd...
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Acked-by: Steve Grubb <sgrubb@xxxxxxxxxx>
Acked-by: Eric Paris <eparis@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN kernel/signal.c~fix-bogus-reporting-of-signals-by-audit kernel/signal.c
--- a/kernel/signal.c~fix-bogus-reporting-of-signals-by-audit
+++ a/kernel/signal.c
@@ -531,18 +531,18 @@ static int check_kill_permission(int sig
if (!valid_signal(sig))
return error;
- error = audit_signal_info(sig, t); /* Let audit system see the signal */
- if (error)
- return error;
-
- error = -EPERM;
- if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
- && ((sig != SIGCONT) ||
- (process_session(current) != process_session(t)))
- && (current->euid ^ t->suid) && (current->euid ^ t->uid)
- && (current->uid ^ t->suid) && (current->uid ^ t->uid)
- && !capable(CAP_KILL))
+ if (info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info))) {
+ error = audit_signal_info(sig, t); /* Let audit system see the signal */
+ if (error)
+ return error;
+ error = -EPERM;
+ if (((sig != SIGCONT) ||
+ (process_session(current) != process_session(t)))
+ && (current->euid ^ t->suid) && (current->euid ^ t->uid)
+ && (current->uid ^ t->suid) && (current->uid ^ t->uid)
+ && !capable(CAP_KILL))
return error;
+ }
return security_task_kill(t, info, sig, 0);
}
_
Patches currently in -mm which might be from viro@xxxxxxxxxxxxxxxx are
fix-bogus-reporting-of-signals-by-audit.patch
git-kbuild.patch
git-net.patch
fix-f_version-type-should-be-u64-instead-of-unsigned-long.patch
introduce-i_sync.patch
slab-leaks3-default-y.patch
-
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