signals: SEND_SIG_NOINFO should be considered as SI_FROMUSER()
authorOleg Nesterov <oleg@redhat.com>
Wed, 16 Dec 2009 00:47:22 +0000 (16:47 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 16 Dec 2009 15:20:08 +0000 (07:20 -0800)
commit614c517d7c00af1b26ded20646b329397d6f51a1
treeddd7a82b3479c9fabe141b4c82a1794650a82b4f
parentd51965037325e51f6cd68583413243c3573e47b0
signals: SEND_SIG_NOINFO should be considered as SI_FROMUSER()

No changes in compiled code. The patch adds the new helper, si_fromuser()
and changes check_kill_permission() to use this helper.

The real effect of this patch is that from now we "officially" consider
SEND_SIG_NOINFO signal as "from user-space" signals. This is already true
if we look at the code which uses SEND_SIG_NOINFO, except __send_signal()
has another opinion - see the next patch.

The naming of these special SEND_SIG_XXX siginfo's is really bad
imho.  From __send_signal()'s pov they mean

SEND_SIG_NOINFO from user
SEND_SIG_PRIV from kernel
SEND_SIG_FORCED no info

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Reviewed-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/sched.h
kernel/signal.c