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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=eaP3Ol+0; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D7002606A32A for ; Tue, 10 Nov 2026 05:23:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=eaP3Ol+0 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1B5AA1F008A1; Tue, 10 Nov 2026 05:23:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794288199; bh=pSAiwwrrpUPeX203g1wEvE60jBtUZDlPkiRPQ5OsvZE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=eaP3Ol+0ZGUTH4YzbDJTYGw6MHt8NzG4ZAdvNuf06JHSZ2iVN3CdYHbchWCQudZ3Q 9UCZ9XLr8W7jqWkW93n3CIZhbbt5JAX/zEgzPLRfpfgW+3OsmjIaWaEHIgf98P8xAP Xl1F4P1HwnY4fpFakNgUg9EIiO5EfRM1faJkmqQThoaBdFQZmgspXjF+vHBS1ZZpS2 NUWKxUl8TDVxY3T6W7jI7ASn4Eo3sC4azl/FuARgr3fCzgYVVwZIUBhLH6FKmRrd8/ 9ec8yDoQX43fsvaHtZJdTptt38QVBpDFjUTzfo+7nTUMT5OkI2cJpM3rIbcQ4lX1mJ 46RZkgdKaBWvg== From: Sasha Levin To: stable@vger.kernel.org Cc: Andrei Vagin , "Peter Zijlstra (Intel)" , Kees Cook , Sasha Levin Subject: [PATCH 5.15.y 2/3] selftest/seccomp: add a new test for the sync mode of seccomp_user_notify Date: Tue, 10 Nov 2026 00:23:16 -0500 Message-ID: <20261110052309.446865-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261110052309.446865-1-sashal@kernel.org> References: <20261107055933-failed-5.15-832b9b176be0@kernel.org> <20261110052309.446865-1-sashal@kernel.org> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Andrei Vagin [ Upstream commit 8feae5adec17ec190118ad84da84a6ad9fa3e30b ] Test output: # RUN global.user_notification_sync ... # OK global.user_notification_sync ok 51 global.user_notification_sync Signed-off-by: Andrei Vagin Acked-by: "Peter Zijlstra (Intel)" Link: https://lore.kernel.org/r/20230308073201.3102738-6-avagin@google.com Signed-off-by: Kees Cook Stable-dep-of: 832b9b176be0 ("seccomp: restore knotif->state when SECCOMP_ADDFD_FLAG_SEND is interrupted") Signed-off-by: Sasha Levin --- tools/testing/selftests/seccomp/seccomp_bpf.c | 55 +++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c index 35c84bc2e5055..cf53b982d8513 100644 --- a/tools/testing/selftests/seccomp/seccomp_bpf.c +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c @@ -4191,6 +4191,61 @@ TEST(user_notification_addfd_rlimit) close(memfd); } +#ifndef SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP +#define SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP (1UL << 0) +#define SECCOMP_IOCTL_NOTIF_SET_FLAGS SECCOMP_IOW(4, __u64) +#endif + +TEST(user_notification_sync) +{ + struct seccomp_notif req = {}; + struct seccomp_notif_resp resp = {}; + int status, listener; + pid_t pid; + long ret; + + 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!"); + } + + listener = user_notif_syscall(__NR_getppid, + SECCOMP_FILTER_FLAG_NEW_LISTENER); + ASSERT_GE(listener, 0); + + /* Try to set invalid flags. */ + EXPECT_SYSCALL_RETURN(-EINVAL, + ioctl(listener, SECCOMP_IOCTL_NOTIF_SET_FLAGS, 0xffffffff, 0)); + + ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SET_FLAGS, + SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP, 0), 0); + + pid = fork(); + ASSERT_GE(pid, 0); + if (pid == 0) { + ret = syscall(__NR_getppid); + ASSERT_EQ(ret, USER_NOTIF_MAGIC) { + _exit(1); + } + _exit(0); + } + + req.pid = 0; + ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); + + ASSERT_EQ(req.data.nr, __NR_getppid); + + resp.id = req.id; + resp.error = 0; + resp.val = USER_NOTIF_MAGIC; + resp.flags = 0; + ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0); + + ASSERT_EQ(waitpid(pid, &status, 0), pid); + ASSERT_EQ(status, 0); +} + + /* Make sure PTRACE_O_SUSPEND_SECCOMP requires CAP_SYS_ADMIN. */ FIXTURE(O_SUSPEND_SECCOMP) { pid_t pid; -- 2.53.0