seccomp: Add missing compat_ioctl for notify

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@linux.ibm.com>
Fixes: 6a21cc50f0c7 ("seccomp: add a return code to trap to userspace")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200310123332.42255-1-svens@linux.ibm.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index b6ea3dcb57bfefa47233ada64d74f822b6666ab6..683c81e4861e7e5ffc9cd105d3b5dbd564f5d637 100644 (file)
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -1221,6 +1221,7 @@ static const struct file_operations seccomp_notify_ops = {
        .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)