linux-kernel - [PATCH for-next/seccomp 2/2] selftests/seccomp: Set NNP for TSYNC ESRCH flag test

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Message-Id: <20200710185156.2437687-3-keescook@chromium.org>
Date:   Fri, 10 Jul 2020 11:51:56 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Will Deacon <will@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>, stable@...r.kernel.org,
        Tycho Andersen <tycho@...ho.ws>, linux-kernel@...r.kernel.org
Subject: [PATCH for-next/seccomp 2/2] selftests/seccomp: Set NNP for TSYNC ESRCH flag test

The TSYNC ESRCH flag test will fail for regular users because NNP was
not set yet. Add NNP setting.

Fixes: 51891498f2da ("seccomp: allow TSYNC and USER_NOTIF together")
Cc: stable@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 tools/testing/selftests/seccomp/seccomp_bpf.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index 08bfbb7fc1c2..93de2f1e3a99 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -3238,6 +3238,11 @@ TEST(user_notification_with_tsync)
 	int ret;
 	unsigned int flags;
 
+	ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
+	ASSERT_EQ(0, ret) {
+		TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
+	}
+
 	/* these were exclusive */
 	flags = SECCOMP_FILTER_FLAG_NEW_LISTENER |
 		SECCOMP_FILTER_FLAG_TSYNC;
-- 
2.25.1