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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Tycho Andersen <tycho@tycho.ws>,
        Kees Cook <keescook@chromium.org>
Subject: [PATCH 5.8 063/232] selftests/seccomp: Set NNP for TSYNC ESRCH flag test
Date:   Thu, 20 Aug 2020 11:18:34 +0200
Message-Id: <20200820091615.845518621@linuxfoundation.org>
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From: Kees Cook <keescook@chromium.org>

commit e4d05028a07f505a08802a6d1b11674c149df2b3 upstream.

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@vger.kernel.org
Reviewed-by: Tycho Andersen <tycho@tycho.ws>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 tools/testing/selftests/seccomp/seccomp_bpf.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -3258,6 +3258,11 @@ 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;