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| author | Vladimir Davydov <vdavydov@parallels.com> | 2015-04-16 12:47:35 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-07-21 08:36:13 +0200 |
| commit | 2b012f593d8a847f2021ac1b986d157b010ed8ad (patch) | |
| tree | 3fff79cba6a6977eb6f063c3d1568e64cd1cfd39 | |
| parent | 948546f8c1a743c138d14aafe54b48ab598f62f6 (diff) | |
| download | lwn-2b012f593d8a847f2021ac1b986d157b010ed8ad.tar.gz lwn-2b012f593d8a847f2021ac1b986d157b010ed8ad.zip | |
signal: remove warning about using SI_TKILL in rt_[tg]sigqueueinfo
commit 69828dce7af2cb6d08ef5a03de687d422fb7ec1f upstream.
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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | kernel/signal.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index e99136208d7e..1a1b0e88c23d 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -3004,11 +3004,9 @@ 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. */ @@ -3053,12 +3051,10 @@ 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); |