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author | Davide Libenzi <davidel@xmailserver.org> | 2007-06-27 21:09:59 (GMT) |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-28 18:34:54 (GMT) |
commit | f8738c5c5298d55ccfc26383f9f45af082a9be57 (patch) | |
tree | baa7c6f2a31dcc4c4d2875f73b1462be5fbb388d /fs | |
parent | 58e78475ec706f93e0cc049449ffd11fbfdadb3e (diff) | |
download | linux-f8738c5c5298d55ccfc26383f9f45af082a9be57.tar.xz |
avoid spurious POLLIN returns in signalfd
The new code in kernel/signal.c does not allow fetching private signals
from another task. This patch avoid spurious POLLIN returns from a
signalfd poll(2) operation.
Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/signalfd.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/signalfd.c b/fs/signalfd.c index f1da892..3b07f26 100644 --- a/fs/signalfd.c +++ b/fs/signalfd.c @@ -133,7 +133,8 @@ static unsigned int signalfd_poll(struct file *file, poll_table *wait) * the peer disconnects. */ if (signalfd_lock(ctx, &lk)) { - if (next_signal(&lk.tsk->pending, &ctx->sigmask) > 0 || + if ((lk.tsk == current && + next_signal(&lk.tsk->pending, &ctx->sigmask) > 0) || next_signal(&lk.tsk->signal->shared_pending, &ctx->sigmask) > 0) events |= POLLIN; |