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| author | Davide Libenzi <davidel@xmailserver.org> | 2007-06-27 14:09:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-28 11:34:54 -0700 |
| commit | f8738c5c5298d55ccfc26383f9f45af082a9be57 (patch) | |
| tree | baa7c6f2a31dcc4c4d2875f73b1462be5fbb388d | |
| parent | 58e78475ec706f93e0cc049449ffd11fbfdadb3e (diff) | |
| download | kernel-common-f8738c5c5298d55ccfc26383f9f45af082a9be57.tar.gz kernel-common-f8738c5c5298d55ccfc26383f9f45af082a9be57.tar.bz2 kernel-common-f8738c5c5298d55ccfc26383f9f45af082a9be57.zip | |
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>
| -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 f1da89203a9a..3b07f26d984d 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; |