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 <[email protected]>
- Davide
---
fs/signalfd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
Index: linux-2.6.mod/fs/signalfd.c
===================================================================
--- linux-2.6.mod.orig/fs/signalfd.c 2007-06-20 13:08:25.000000000 -0700
+++ linux-2.6.mod/fs/signalfd.c 2007-06-20 13:09:00.000000000 -0700
@@ -133,7 +133,8 @@
* 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;
-
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