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-rw-r--r--fs/fcntl.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 3b01b646e528..0491da3b28c3 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -741,10 +741,21 @@ static void send_sigio_to_task(struct task_struct *p,
si.si_signo = signum;
si.si_errno = 0;
si.si_code = reason;
+ /*
+ * Posix definies POLL_IN and friends to be signal
+ * specific si_codes for SIG_POLL. Linux extended
+ * these si_codes to other signals in a way that is
+ * ambiguous if other signals also have signal
+ * specific si_codes. In that case use SI_SIGIO instead
+ * to remove the ambiguity.
+ */
+ if (sig_specific_sicodes(signum))
+ si.si_code = SI_SIGIO;
+
/* Make sure we are called with one of the POLL_*
reasons, otherwise we could leak kernel stack into
userspace. */
- BUG_ON((reason & __SI_MASK) != __SI_POLL);
+ BUG_ON((reason < POLL_IN) || ((reason - POLL_IN) >= NSIGPOLL));
if (reason - POLL_IN >= NSIGPOLL)
si.si_band = ~0L;
else