From patchwork Fri Jan 3 05:02:01 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julian Sun X-Patchwork-Id: 13925127 Received: from mail-pl1-f171.google.com (mail-pl1-f171.google.com [209.85.214.171]) (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 ECEA918AE2 for ; Fri, 3 Jan 2025 05:02:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735880538; cv=none; b=KD52petUl4QS5nEkxcsuG1sTwf1D6Q13VvksY2q18cHyHSsQTgqqt5sMsguuCEuGmaP4Ah28s2CCggYdbscg0yADpqah9rusYU/PSA6pVXP570wvBKWn8r6TE3SvbQz5ZL4HoHYZT59NkVjpplXY1a5PMs8vQlmGAMsNCXkikpU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735880538; c=relaxed/simple; bh=1+Hnd89uiTgIAeZafNGuZoLl6tm6pr/nCM9ZfTkZc38=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=V+fEPJ2wvIV8s6R6yBuW7rdX71jaDLnFQ5rcMEFjQyfFrDO9emIqZXdjt8ehffC2o8dA/sBOIIZ8AXo874hiy1ml97mMLy3eRwyBCgqGhdlh9sj8mzRMYjKXQ5hTSx+6/Fr+zibwORYHtubaMSy/A9f6GOr2hyflLLS6DrcpUcs= 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=gauzxutv; arc=none smtp.client-ip=209.85.214.171 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="gauzxutv" Received: by mail-pl1-f171.google.com with SMTP id d9443c01a7336-21644aca3a0so85195215ad.3 for ; Thu, 02 Jan 2025 21:02:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1735880536; x=1736485336; darn=lists.linux.dev; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=E3P3lrAlF6U1N0DIATeaF3EsAEMs/Rqz7fzLm+i2faA=; b=gauzxutvbICYGILMPBVnslEwl3zIry5kIrxS4CFWhAx3APIBGgxWqjUl915jxgr5lN jzgt4xw6j4ANJuE3XibjIUmi8O/gJmZmkp734yljJzZM4Z8G+xz2eCy8hmQYiK3Q73J8 uXmzjHKverdWwcMHVKSIMsbOkY3zGsBBgJAMYkZJDkaCgkxHqWDfWdaDqnQT5caoe1ho da8JeFLGXuFKIZ4rdMQ/L7KA6aRR4LSSWJMsvo8jr3+vlumOlUgp4/VhuiSorj0iDp1G yBqnT2EK114LagLNL9WpHx60+t+3EUAtns+q4NdGAutdph74TcIMaWgqks7S+XSETgLK ecYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1735880536; x=1736485336; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=E3P3lrAlF6U1N0DIATeaF3EsAEMs/Rqz7fzLm+i2faA=; b=g3px3nhwZhe+zTO8RBv7a56YTlx8a1jC1eRunwtC7CiKbKrOzhCLgjKFDB6ThrtePX 93h7twTrmEd8QM3RuwAdJ47vBD1YckDBO6ZQ3Dxei9FqH4cxs7rNTFZW9nhka76AcU0i DL5ArrkiPGNQhILWuFyb07UXZz18ui25nfZleH2wbWRBij1zAUMikBji7XTKUBL4Xygw gcgvbwwX2xDIB43uPA3XqP+I0q9sr0DHG+fQLWldoicvVxz2ZDkX4JUP4LO4VlBRsNO8 TTcV1HVV8L0cqoXHVv6sSEoSKdmQ4VgaMmjp1Na9812zC76FEO/kPKzH6ofmfbFDaTNg lzCQ== X-Gm-Message-State: AOJu0Yw9AguP9s8biobi46QaHCk2tdNWWfJ5/YcrnGyh0hcevv1ZAov7 A/9EVnYVDvVMnkGdVyYKA6h/oJZ9+sMiKJRe1QWxJDNeJEbvs2kb71DBJvaBWSOdlQ== X-Gm-Gg: ASbGncvOb1fSRWyy4F4R0rBq8LGHuiCc8qagyctqSV+H7ki0JbLDFKbZnRIwYL2hmv5 /taw8RGZeC57qhwt10A+1ir9sR41I5UfsUowyKuOjk1XMXrE+fjIP9vLUVIxpUUkokdwebYtu9U jOGw29fFCvGE+EwMuQUAmwfRbReu94Qcnu8F4RT8Q1HdUfzUW8jtM7AKjbTCAKL+oMY/V8JTtJE JdRka35jZXuB0Jakynxj02n0EAzQqN/g1244DbHyRPgy0mL9uWdX1ze+XKOuyBVvHDI3X/WuBmg AD6T4+2gdQyWWw== X-Google-Smtp-Source: AGHT+IHXbok6b2UfVzGCerqZKoox4cB6od0YpqYB7z6GZZefFHku7Okae/UeF9fztsC5A1GLbvW+NQ== X-Received: by 2002:a05:6a21:1516:b0:1e1:bf32:7d3a with SMTP id adf61e73a8af0-1e5e079c48bmr72646157637.26.1735880535714; Thu, 02 Jan 2025 21:02:15 -0800 (PST) Received: from localhost ([206.237.119.147]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-72aad816459sm26147861b3a.23.2025.01.02.21.02.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jan 2025 21:02:15 -0800 (PST) From: Julian Sun To: ocfs2-devel@lists.linux.dev Cc: mark@fasheh.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, Julian Sun , syzbot+2313dda4dc4885c93578@syzkaller.appspotmail.com Subject: [PATCH v3 1/2] ocfs2: Check el->l_next_free_rec in ocfs2_get_clusters_nocache Date: Fri, 3 Jan 2025 13:02:01 +0800 Message-Id: <20250103050202.825893-1-sunjunchao2870@gmail.com> X-Mailer: git-send-email 2.39.5 Precedence: bulk X-Mailing-List: ocfs2-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hi, Recently syzbot reported a use-after-free issue[1]. The root cause of the problem is that the journal inode recorded in this file system image is corrupted. The value of "di->id2.i_list.l_next_free_rec" is 8193, which is greater than the value of "di->id2.i_list.l_count" (19). To solve this problem, an additional check should be added within ocfs2_get_clusters_nocache(). If the check fails, an error will be returned and the file system will be set to read-only. [1]: https://lore.kernel.org/all/67577778.050a0220.a30f1.01bc.GAE@google.com/T/ Reported-and-tested-by: syzbot+2313dda4dc4885c93578@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=2313dda4dc4885c93578 Signed-off-by: Julian Sun --- fs/ocfs2/extent_map.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c index f7672472fa82..04794ac228d8 100644 --- a/fs/ocfs2/extent_map.c +++ b/fs/ocfs2/extent_map.c @@ -435,6 +435,15 @@ static int ocfs2_get_clusters_nocache(struct inode *inode, } } + if (le16_to_cpu(el->l_next_free_rec) > le16_to_cpu(el->l_count)) { + ret = ocfs2_error(inode->i_sb, "Invalid dinode #%llu: next_free_rec is %u, count is %u\n", + (unsigned long long)di_bh->b_blocknr, + le16_to_cpu(el->l_next_free_rec), + le16_to_cpu(el->l_count)); + + goto out; + } + i = ocfs2_search_extent_list(el, v_cluster); if (i == -1) { /*