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Subject[PATCH 5.4 096/191] selftests/seccomp: Catch garbage on SECCOMP_IOCTL_NOTIF_RECV
Date
From: Sargun Dhillon <sargun@sargun.me>

commit e4ab5ccc357b978999328fadae164e098c26fa40 upstream.

This adds logic to the user_notification_basic test to set a member
of struct seccomp_notif to an invalid value to ensure that the kernel
returns EINVAL if any of the struct seccomp_notif members are set to
invalid values.

Signed-off-by: Sargun Dhillon <sargun@sargun.me>
Suggested-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20191230203811.4996-1-sargun@sargun.me
Fixes: 6a21cc50f0c7 ("seccomp: add a return code to trap to userspace")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
tools/testing/selftests/seccomp/seccomp_bpf.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -3147,7 +3147,18 @@ TEST(user_notification_basic)
EXPECT_GT(poll(&pollfd, 1, -1), 0);
EXPECT_EQ(pollfd.revents, POLLIN);

- EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
+ /* Test that we can't pass garbage to the kernel. */
+ memset(&req, 0, sizeof(req));
+ req.pid = -1;
+ errno = 0;
+ ret = ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req);
+ EXPECT_EQ(-1, ret);
+ EXPECT_EQ(EINVAL, errno);
+
+ if (ret) {
+ req.pid = 0;
+ EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
+ }

pollfd.fd = listener;
pollfd.events = POLLIN | POLLOUT;

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