From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f179.google.com (mail-pf1-f179.google.com [209.85.210.179]) (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 995CC37F32F for ; Tue, 18 Aug 2026 08:35:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787042116; cv=none; b=o+L/t81KxX5upvXoFAOMJzSUV1s9I50oWj3jk3qO5Y68+sfI/xB9uZEMq8mOgqMlWew8tDYBAgXq5x018/y8wl8qHEBvd4H5Aokfxsq4GiqLmw79AOiIR2YNqCiAFJ2S2EWAuWw2RVtWWmYTbkj6FCrgLIPYsFo66Fdd8jd0TzE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787042116; c=relaxed/simple; bh=CLQaSv3lamkgBL1GM90wlYcd4kI9IBfMx8trqh3HCjI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=u3mvYfaZHDbMXs1OBA1A7Z0XwYCFyNRm9bQTPTNhlO8I2f3dwZwEXmwhVBCYddPAUBZUSAUiFHxwX6xSu65ck9TaqIuKRagOkyqNtSlGOPSIdl7U1cnCiK1YiAzIFy1tiW6Duk4DkG0H6Y6VHzxlOvmyWZeuZHNW3MktoSFHPqc= 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=AwjiECZn; arc=none smtp.client-ip=209.85.210.179 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="AwjiECZn" Received: by mail-pf1-f179.google.com with SMTP id d2e1a72fcca58-84f3ab8751fso42207b3a.2 for ; Tue, 18 Aug 2026 01:35:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1787042115; x=1787646915; darn=lists.linux.dev; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=1V9rOlexPr/BBHeo5V1wTpFmsLr8dTCItzZ5QDRqTjs=; b=AwjiECZn0apjhKLMFqTsUXTGT4fk+QWjFytm0f1p5yF1Am4XNJcoovA1aNlcRgqe0w RiOX1BccWlYkpVfWoS8lMR2vQPJErv2osEku/1RVHA0F/CEspuGNo7fLPbp+TBMCwJqJ rnkpRhBLk7V+3kT27ASFyO3JyrqlUE9g2myeeQnXaBcc13sYkytVcmxkwfNMYPDjayaM t1AC17XhkDJcaB5P8h2AOWpyZfSUw+BzK9uLe2fXKk+ltgwGKOIy7c9qsm+jaZLmBibk 2ca9bmoWCCKlRm+HnqUuTWRI8iU0GAMIL+eZMOmROH2S2N8R3CFVF3kHvWF+aYzxLlf+ e/1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787042115; x=1787646915; h=content-transfer-encoding:mime-version:references:in-reply-to :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=1V9rOlexPr/BBHeo5V1wTpFmsLr8dTCItzZ5QDRqTjs=; b=SNJzr7TevL9vCrz3dR4lU2Vbye2DfsusyneDLrfUzneS6vljHOPuBszDiXX7lfONCH djCsZKsAd535ytECFAB/pPSs1yEIfXnbGQNISPqLN6WyVfUVCXtdEAGuEPsUdt8z05+M lS/mA+O6Iw6cQ+LE52Wf0lJ80Wz+qQq/MZlssBLzJjDpeEWT+wLhnZoTMTUy/tNNfred Cnx1CNYfLhUkval+o/sQfRIWWg+HmaOMlhDN5fQ5j+2X4hBzyFUPk/dOkfecwPpjpiSv D6p+Nb3e9ebU4Lz78Ix9ye1stpEW4lh6xvydrtC1L3OItzt21WZiz4iWa/Y1+dngEVfF iGpg== X-Gm-Message-State: AOJu0YxUvYbLzZy5EtiDFJwC1x8NIkEEoo3BZriZulJT+1zOtd+FPz0q 7LgVfIsU5M5EtXffRp1hkxs1YtTLzRiKcSamGD4uUx0fxCPgIDIZ84Xi X-Gm-Gg: AR+sD10FRK0FmeAoqMoOo91ymd/6N3prG90RsCTiRN2Z9Rrkau2Qy4en7lXGRtHMr+R luH7jxeN2/TQTpDiBQ9kiUpRtuSl9GBDm+HJnsxvXVjjEBqavtjmyFjCZD6evRabxrncYh8e/0n xUp1V80lPvuPsEwqgdP/Aep0e9HP2rdPQSe6clPTsip4vLUC7ewB72byCENN5TtIXRZ3ESXNPT4 vuVYUJtGtXSyJgAy4Jxy+WmsQzuAKsdve34HdJ2PFrlb+lqiHuV2AKOOMIxwmgn5p6fExc6um/3 hEGpNZYWBjvUY9bSWcsy6Ag4XTILY0zcbdqfFan4rr8SCeUYczCG0Po4Chg75tkukl7baXqafw+ CdFsxB3Q1M5o6XPoFJbx9nmA3bk9zMHqsZH8CjRGpHMpWCGA8qUulZjO7RLtBbdfo1brQPPP+XL LOxt2HSGZq1ZvgNfM3W0p4qjf1p3ypT4qO7HduA9PQ8uBdaZ74mdZoqZAkOe+FsjHOX1MrHwACI A== X-Received: by 2002:a05:6a00:4a01:b0:845:cf73:5bd8 with SMTP id d2e1a72fcca58-84fddf86f3fmr12810918b3a.1.1787042114885; Tue, 18 Aug 2026 01:35:14 -0700 (PDT) Received: from localhost.localdomain ([175.159.181.20]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-851b6f8cdd1sm1258581b3a.36.2026.08.18.01.35.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Aug 2026 01:35:14 -0700 (PDT) From: Yu Junzhe To: Mikulas Patocka , Mike Snitzer , Benjamin Marzinski , Alasdair Kergon Cc: dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [BUG] dm-integrity: mode R resume NULL deref when DIRTY_BITMAP is set Date: Tue, 18 Aug 2026 08:35:10 +0000 Message-ID: <20260818083511.352-1-junzheyu1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260817100605.292-1-junzheyu1@gmail.com> References: <20260817100605.292-1-junzheyu1@gmail.com> Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Hi Mikulas, Thanks for the patch. We A/B-tested it on Linux 6.6.144 KASAN against the minimized PoC (mode B format, plant SB_FLAG_DIRTY_BITMAP, load+resume mode R). Results: - unpatched: KASAN null-ptr-deref in list_get_page via rw_journal_sectors / dm_integrity_resume - with your change (skip writes in dm_integrity_resume when mode == 'R'): PoC completes; no list_get_page / KASAN on resume Happy to test follow-ups if needed. Thanks, Yu Junzhe FuzzAnything