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signal: remove warning about using SI_TKILL in rt_[tg]sigqueueinfo

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Sending SI_TKILL from rt_[tg]sigqueueinfo was deprecated, so now we issue
a warning on the first attempt of doing it.  We use WARN_ON_ONCE, which is
not informative and, what is worse, taints the kernel, making the trinity
syscall fuzzer complain false-positively from time to time.

It does not look like we need this warning at all, because the behaviour
changed quite a long time ago (2.6.39), and if an application relies on
the old API, it gets EPERM anyway and can issue a warning by itself.

So let us zap the warning in kernel.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Davydov 2015-04-16 12:47:35 -07:00 committed by Linus Torvalds
parent 64a4096c5c
commit 69828dce7a
1 changed files with 5 additions and 9 deletions
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14
kernel/signal.c
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@ -2992,11 +2992,9 @@ static int do_rt_sigqueueinfo(pid_t pid, int sig, siginfo_t *info)
* Nor can they impersonate a kill()/tgkill(), which adds source info.
*/
if ((info->si_code >= 0 || info->si_code == SI_TKILL) &&
(task_pid_vnr(current) != pid)) {
/* We used to allow any < 0 si_code */
WARN_ON_ONCE(info->si_code < 0);
(task_pid_vnr(current) != pid))
return -EPERM;
}
info->si_signo = sig;
/* POSIX.1b doesn't mention process groups. */
@ -3041,12 +3039,10 @@ static int do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, siginfo_t *info)
/* Not even root can pretend to send signals from the kernel.
* Nor can they impersonate a kill()/tgkill(), which adds source info.
*/
if (((info->si_code >= 0 || info->si_code == SI_TKILL)) &&
(task_pid_vnr(current) != pid)) {
/* We used to allow any < 0 si_code */
WARN_ON_ONCE(info->si_code < 0);
if ((info->si_code >= 0 || info->si_code == SI_TKILL) &&
(task_pid_vnr(current) != pid))
return -EPERM;
}
info->si_signo = sig;
return do_send_specific(tgid, pid, sig, info);