From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f47.google.com (mail-pj1-f47.google.com [209.85.216.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F16083B05AC for ; Wed, 7 Oct 2026 11:16:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791371819; cv=none; b=r7A/Nb1lI6IFtbPjTfDCzW1Vm5eIz9aEs/o4YThprl4iyvA/HqcVMS7LfLd0Kh6Rp/Dwk0JAjI8yobA3Utwax9odJjQmZ1bx8U2a9UHsC7ny8wQdAG89geODS201bQqRec+PvTGbIEg28kqP1CLx/K6w+7n+dOLx/kpv3d/Hb5w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791371819; c=relaxed/simple; bh=P3KyXyTNzLWqPtiDsAWlEoyQ2QATyxAt/NpP8cQGtao=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=mOLhMPKpX4RJ5NmoDnnotsn0EZC3lG3HuEoT6KJbLKMtP6EOY0dFGGoigiob2ixCCPolIsp1lDC1/19x1N73h0ijjyoQWjOKDhjbTNcRFU/rlUa7qZn0qS2C3Z+4SJP8GMiZ8tyEz+ufxA05zp+l1YpEK0kdUawslBCBMhLd0so= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Iln7cd7+; arc=none smtp.client-ip=209.85.216.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Iln7cd7+" Received: by mail-pj1-f47.google.com with SMTP id 98e67ed59e1d1-3a80d1c98f5so2175805a91.0 for ; Wed, 07 Oct 2026 04:16:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1791371781; x=1791976581; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=epeEoqFJxJZ9rzrd7Yj+uBKsPgIccWzbk6+MVwkssHo=; b=Iln7cd7+o5eBViKFtOjZOE5e/zOFAMQiK4voG5O5+FoSD3b4D5hOmAL6GR4rqzVTLT ZBuIs80RiKLH1XcvDWvglvZeXCiCNxAZzIbstGQ/NofVbeM1Lbx6pEHJm1rKUgV37iDT /hI66+SpyWy33NRwIghFkrvyZzPC2A/EHLywWW9GJZHvFSDNjlbHoNehfd+5N2R5KNt1 LIvfq+UNzRLWm143KCIORZGilblgovvGWOJt7d+xbIL0o4KeHtI3vdMX86TnVdM1zS3E O031w2y/NsC51Q20kvbC3NOpoJKQsiSDmtov0jNWzfoC/WUQmjfHZX1V4AZy4Zbjq7rV lMiw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791371781; x=1791976581; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=epeEoqFJxJZ9rzrd7Yj+uBKsPgIccWzbk6+MVwkssHo=; b=V9K8lv+/sJ1ZOvzVX4JifoVu3WJRq0y8D9mWJg+dmsdisL31qr4MYSjyBQggAd9HEq Tgi7Rbq3WQ4bhh1fZq9dP059RnP2fH1spW7QhNdofObe1jCNce/8qgjigifnnhLcdV7X 71id5OQW7SW/G4QXakN2WVnfhzkcUc1CpCtqg1YCl8z7jmgyHZSIJ6U+IrkN6L17I+0s 1F4fVMdawfSLJhcgVE5kAInbmUylB5cSs6JjBAvUyKGruxyxUTCszFCscSsg+B0R6Q/J fXbZ7Zy4Fm3f61P4SDgugfeDToYdxwvbwM9rNg+jLyFUIIS713pCdc0D+R4yGLIMLWA7 GK6g== X-Forwarded-Encrypted: i=1; AKwUvBzwa1Tmq0b1xLMOUkU8t0fE6RSo0pn4uLBdztnoBlWfuYh6rzmRwulfpEjP3xtiUgFx7676z2uPZC5N5Tc=@vger.kernel.org X-Gm-Message-State: AFq9FYIfvwl1QgX2b72vfbGSIytss/tKqwtQsZVy6B2unOWmqwPhQO2k VrBDqvhUEoCn/Sjy/SG3VMPYHh0c7yn8N5p/yTVIsHYQS+4wvQTOALne X-Gm-Gg: AYBFou2E+3N3v4NQ+1kzOH0m8ku25tUS1AA9ekb1HN+Yt6JvJGvV7xGjKPdVMuf/npE hi8x1XAE2ESLFFfI9peD7XtA0XQlG4NafgqSMcjFoyWEMvFKEq5te+rOCbMrs4KJt9RkGo/K2jg fgjtbkP1IT2/ZCzkHxBgRTURCgz6sCnAyTLSf1i/ec1TGml7ef3rdl9/YNK0gQ07z1TFtbSkLXz UJV6qqIEcdIBdYDTmrAN4XiociIeEqSQtfbLzbn76QCKkJyN/4xgBgkocU1tcLwDfS2qhoEBct1 EEfWklHwPBhO1Z0E9JW1Loi2nEGWw4HdC+rKKLVo+LTCQoUxyDDBJ4XaFQvX7Fxt4vzES3i4i2I fTm2Gg3fkKVpPyArX4uPIuuwPtC5iNoDp7yIY7OeYefhXw0ISkgVgKagKvKOTf/PavuP6covY5w HsXcCXv/oQ6WLq6oMeavkJhdA0/y2YrUWNjUtF+X9WSCKIKb7X9BRh5oyR1LcxhxnmTvC4uNe5L g== X-Received: by 2002:a17:90b:4b8d:b0:3a5:25e:85fc with SMTP id 98e67ed59e1d1-3a8a1ce5d6cmr1698155a91.63.1791371781245; Wed, 07 Oct 2026 04:16:21 -0700 (PDT) Received: from lima-kernel-dev.. ([161.142.150.60]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a8a5e825b9sm1450044a91.3.2026.10.07.04.16.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Oct 2026 04:16:20 -0700 (PDT) From: Daniel Syauqi To: John Stultz , Thomas Gleixner , Shuah Khan Cc: Stephen Boyd , Miroslav Lichvar , Anna-Maria Behnsen , Frederic Weisbecker , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH] selftests: timers: skip raw_skew when adjtimex fails Date: Wed, 7 Oct 2026 19:16:11 +0800 Message-ID: <20261007111611.2086-1-syauqicode@gmail.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit raw_skew reads frequency and offset data from adjtimex() without checking whether either query succeeded. If a sandbox blocks the syscall, the test can use uninitialized data and wait two minutes before producing a misleading result. Skip on either failure and report the syscall error. Preserve errno across the newline printed after the second query. Fixes: 51f91cbdf545 ("selftests/timers: Add clock skew estimation test from timetest suite") Assisted-by: LLM Codex Signed-off-by: Daniel Syauqi --- Tool assistance: OpenAI Codex helped identify the unchecked adjtimex() returns, draft the fix and changelog, and create failure-path tests. Prompt summary: Investigate the unchecked adjtimex() calls in raw_skew and prepare and test a narrow selftest fix. The affected content is raw_skew.c error handling and this changelog. Tests: Built raw_skew with make. Forced EPERM at each adjtimex() call separately with LD_PRELOAD; both runs skipped with exit status 4. A normal raw_skew run passed, and targeted timer selftests had no failures. The full kernel test suite was not run. tools/testing/selftests/timers/raw_skew.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c index 0c87a8fb0..2ad5e2e35 100644 --- a/tools/testing/selftests/timers/raw_skew.c +++ b/tools/testing/selftests/timers/raw_skew.c @@ -19,7 +19,9 @@ * GNU General Public License for more details. */ +#include #include +#include #include #include #include @@ -101,7 +103,8 @@ int main(int argc, char **argv) } tx1.modes = 0; - adjtimex(&tx1); + if (adjtimex(&tx1) < 0) + ksft_exit_skip("adjtimex failed: %s\n", strerror(errno)); get_monotonic_and_raw(&mon, &raw); start = mon; delta1 = diff_timespec(mon, raw); @@ -116,7 +119,12 @@ int main(int argc, char **argv) get_monotonic_and_raw(&mon, &raw); end = mon; tx2.modes = 0; - adjtimex(&tx2); + if (adjtimex(&tx2) < 0) { + int saved_errno = errno; + + printf("\n"); + ksft_exit_skip("adjtimex failed: %s\n", strerror(saved_errno)); + } delta2 = diff_timespec(mon, raw); interval = diff_timespec(start, end); base-commit: 602042bf29f6efde39cfb5fdd9289bf4854bc0c5 -- 2.47.3