From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BDE313C2774; Wed, 14 Oct 2026 09:53:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791971602; cv=none; b=VQgTyxS0GbuscKmOh5f/ht9gT8m6g32S0eQssz5tJto9skoJNWwundKYxFNWaP4nfoOg9WSuVI0Gq3iwyfN0reG5y2stnc2HsPoThfFz7BU+Gze7sn7HZgG+ugawMSfbc8/DpreCMN8EiVQtiSDhADGiQJcfDymMqrInbooigPM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791971602; c=relaxed/simple; bh=71Nb/diD0RFkIlqGupsPVxEdRSByfY6gUGToH1EH1XQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=eb26lFsb1RIUaFuohgbfjjrnvEtntCHtzFHfokHBV5yRuWLOwjAxbvndTY9v5e25B5qORCPDPbXSVi/A1HAtkjrzskZ6Hlj5t9G/yhNCP3wDr0a4hmNUpXcfNrFirlcb7r9ouzkuSuEH7nTPuYthwLHbP5Y0t2Xa/fV3+ymTeWw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=THlFOC+8; arc=none smtp.client-ip=117.135.210.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="THlFOC+8" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=20 /IVJDdeostxRbcAR4r2TFhHfef4iPbpNq8zOKeLNQ=; b=THlFOC+8TygI4enULa 5S0Cqho3L8vkADWlx3D8kSIs3c4LaHeyZqYrhJhIEaoQWCKCfkg0lOj7kxxa0BAX DgqIzuOtUWiDgOI2k+VMx4hJrzdi/A8YuxkfEhQKxKuYRajZXWf7LbtI+zi/a6pe lS4A9mUzfeR7z/EOGAmgigNkU= Received: from localhost (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wDnT1LpUM9qHgaBEg--.10621S2; Wed, 14 Oct 2026 17:52:41 +0800 (CST) From: Hui Su To: elver@google.com, dvyukov@google.com Cc: kasan-dev@googlegroups.com, corbet@lwn.net, skhan@linuxfoundation.org, rdunlap@infradead.org, workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 3/4] kcsan: add targeted watchpoint selftest Date: Wed, 14 Oct 2026 18:52:37 +0900 Message-ID: <20261014095238.2132580-4-sh_def@163.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wDnT1LpUM9qHgaBEg--.10621S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7uF4DJr4DKF43ZF45uryxuFg_yoW8trykpr 4qkr45tw4FyrZaqF4fCFy8ZF1rJrs7Cry7t34Igr4kZ34agrs5K3s2kr4qkFnIgFZ0gr1Y yasrJF1UCay5XaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07jjv38UUUUU= X-CM-SenderInfo: xvkbvvri6rljoofrz/xtbC6QncPGrPUOnUIgAA3q Test targeted address matching for exact and containing access ranges, adjacent ranges, zero-sized accesses, and boundary addresses at ULONG_MAX. These cases cover subtraction-based matching without runtime debugfs setup. Signed-off-by: Hui Su --- kernel/kcsan/selftest.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/kernel/kcsan/selftest.c b/kernel/kcsan/selftest.c index 84a1200271af..8da1ba2ba25a 100644 --- a/kernel/kcsan/selftest.c +++ b/kernel/kcsan/selftest.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -101,6 +102,33 @@ static bool __init test_matching_access(void) return true; } +/* Test whether an access contains the selected target byte. */ +static bool __init test_target_matching(void) +{ + const unsigned long target = 0x1004; + + if (WARN_ON(!kcsan_target_matches(target, 0x1004, 1))) + return false; + if (WARN_ON(!kcsan_target_matches(target, 0x1000, 8))) + return false; + if (WARN_ON(kcsan_target_matches(target, 0x1000, 4))) + return false; + if (WARN_ON(kcsan_target_matches(target, 0x1005, 1))) + return false; + if (WARN_ON(kcsan_target_matches(target, 0x1004, 0))) + return false; + if (WARN_ON(!kcsan_target_matches(ULONG_MAX, ULONG_MAX, 1))) + return false; + if (WARN_ON(!kcsan_target_matches(ULONG_MAX, ULONG_MAX - 3, 4))) + return false; + if (WARN_ON(kcsan_target_matches(ULONG_MAX, ULONG_MAX - 1, 1))) + return false; + if (WARN_ON(kcsan_target_matches(0, ULONG_MAX - 1, 4))) + return false; + + return true; +} + /* * Correct memory barrier instrumentation is critical to avoiding false * positives: simple test to check at boot certain barriers are always properly @@ -251,6 +279,7 @@ static int __init kcsan_selftest(void) RUN_TEST(test_encode_decode); RUN_TEST(test_matching_access); + RUN_TEST(test_target_matching); RUN_TEST(test_barrier); pr_info("selftest: %d/%d tests passed\n", passed, total); -- 2.55.0