[PATCH 5.6 089/254] seccomp: Add missing compat_ioctl for notify

[Greg Kroah-Hartman]

From: Sven Schnelle <svens@xxxxxxxxxxxxx>

commit 3db81afd99494a33f1c3839103f0429c8f30cb9d upstream.

Executing the seccomp_bpf testsuite under a 64-bit kernel with 32-bit
userland (both s390 and x86) doesn't work because there's no compat_ioctl
handler defined. Add the handler.

Signed-off-by: Sven Schnelle <svens@xxxxxxxxxxxxx>
Fixes: 6a21cc50f0c7 ("seccomp: add a return code to trap to userspace")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20200310123332.42255-1-svens@xxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 kernel/seccomp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -1221,6 +1221,7 @@ static const struct file_operations secc
 	.poll = seccomp_notify_poll,
 	.release = seccomp_notify_release,
 	.unlocked_ioctl = seccomp_notify_ioctl,
+	.compat_ioctl = seccomp_notify_ioctl,
 };
 
 static struct file *init_listener(struct seccomp_filter *filter)