The patch titled
avoid spurious POLLIN returns in signalfd
has been added to the -mm tree. Its filename is
avoid-spurious-pollin-returns-in-signalfd.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: avoid spurious POLLIN returns in signalfd
From: Davide Libenzi <davidel@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/signalfd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN fs/signalfd.c~avoid-spurious-pollin-returns-in-signalfd fs/signalfd.c
--- a/fs/signalfd.c~avoid-spurious-pollin-returns-in-signalfd
+++ a/fs/signalfd.c
@@ -133,7 +133,8 @@ static unsigned int signalfd_poll(struct
* 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;
_
Patches currently in -mm which might be from davidel@xxxxxxxxxxxxxxx are
eventfd-clean-compile-when-config_eventfd=n.patch
avoid-spurious-pollin-returns-in-signalfd.patch
introduce-o_cloexec-take-2.patch
-
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