Eric Lee / linux-smarc-t335x-v3.2

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Commit f8738c5c5298d55ccfc26383f9f45af082a9be57

Authored by Davide Libenzi
Committed by Linus Torvalds
1 parent 58e78475ec
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

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>

Showing 1 changed file with 2 additions and 1 deletions Side-by-side Diff

... ... @@ -133,7 +133,8 @@
133 133 * the peer disconnects.
134 134 */
135 135 if (signalfd_lock(ctx, &lk)) {
136   - if (next_signal(&lk.tsk->pending, &ctx->sigmask) > 0 ||
  136 + if ((lk.tsk == current &&
  137 + next_signal(&lk.tsk->pending, &ctx->sigmask) > 0) ||
137 138 next_signal(&lk.tsk->signal->shared_pending,
138 139 &ctx->sigmask) > 0)
139 140 events |= POLLIN;