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authorOleg Nesterov <oleg@redhat.com>2009-09-23 15:57:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-24 07:21:01 -0700
commit06f1631a1671bce2d59d58cb1debdf23e1803ebf (patch)
treed1c5cc02d8ceff4c50c098dce957ad63a09e84a5 /arch/parisc
parent4a30debfb778240a4b1767d4b0c5a5b25ab97160 (diff)
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signals: send_sigio: use do_send_sig_info() to avoid check_kill_permission()
group_send_sig_info()->check_kill_permission() assumes that current is the sender and uses current_cred(). This is not true in send_sigio_to_task() case. From the security pov the sender is not current, but the task which did fcntl(F_SETOWN), that is why we have sigio_perm() which uses the right creds to check. Fortunately, send_sigio() always sends either SEND_SIG_PRIV or SI_FROMKERNEL() signal, so check_kill_permission() does nothing. But still it would be tidier to avoid this bogus security check and save a couple of cycles. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: stephane eranian <eranian@googlemail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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