From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 6035A4B0CB5 for ; Thu, 3 Sep 2026 14:46:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788446808; cv=none; b=goUU0Bl93eJxuqeMj+y3lISUaI4S8OooSD9h11hyA3Vhc2VDwcwlbZ3vQsbyXBfMXIekSzXdXQHmaopEYlbIgZDN7ixHrW41uODqbc1f3BmumCIff7Owdvhrtac3VAh9PZxqMFpmQtZMVL8b8hA9Flpd/2gEGJ9ydKBXQFYTe68= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788446808; c=relaxed/simple; bh=nh8qhcfs49siiWe7lixhv4HnEIHp8Yq5KFQ6I4qOiO4=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=JG6DZeek+ulM+2E7IPgbx2h62vevcIzOfY0K50w98QfSqth2hRYdLTIG9I0GPouCPqMnvqOyXXRERBcJt776MT8e5ZGxqrIIWOb8W5Y89MixSZRlGuz/PTRENN9P9BfJluC7yGQvXmovXxpaCE1MKNWvOoHv2J6ojwCltWnprKc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fa3Gv70z; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fa3Gv70z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA6A31F00A3A; Thu, 3 Sep 2026 14:46:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788446807; bh=p65/BJh2L3TCpnhpcEkVX+iRhPjbZ1WJML8O4+eyTcA=; h=Subject:To:Cc:From:Date; b=fa3Gv70zzCquF5x/vvn87JhJxCuneun8fPSb8pYKUT+xcDRM64XMAWYP81Pd8x9kf SML/JJtfTny+qNPsqsx3CYyNGVQ8gaPoV6bo9K+andLzfyFPLItI+Sn0vpf3zhWbQS XiPA7+en2P0mIT1izKPWTpEjDXFs6XOgRP/vZFsE= Subject: FAILED: patch "[PATCH] ocfs2: validate directory-index entry counts when reading" failed to apply to 6.12-stable tree To: doruk@0sec.ai,akpm@linux-foundation.org,gechangwei@live.cn,heming.zhao@suse.com,jlbec@evilplan.org,joseph.qi@linux.alibaba.com,junxiao.bi@oracle.com,kees@kernel.org,mark@fasheh.com,piaojun@huawei.com,stable@vger.kernel.org Cc: From: Date: Thu, 03 Sep 2026 16:29:40 +0200 Message-ID: <2026090340-backside-dangling-fd8e@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x bc70726ddad53c7e9a9a85915bf2415b0d4f42f9 # git commit -s git send-email --to '' --in-reply-to '2026090340-backside-dangling-fd8e@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From bc70726ddad53c7e9a9a85915bf2415b0d4f42f9 Mon Sep 17 00:00:00 2001 From: Doruk Tan Ozturk Date: Mon, 13 Jul 2026 22:56:25 +0200 Subject: [PATCH] ocfs2: validate directory-index entry counts when reading metadata ocfs2_validate_dx_leaf() and ocfs2_validate_dx_root() check the ECC and signature of an indexed-directory block before it reaches higher-level callers, but neither validator bounds the ocfs2_dx_entry_list counts against the capacity of the block that holds them. ocfs2_dx_dir_search() then walks for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) dx_entry = &entry_list->de_entries[i]; over de_num_used entries with no bounds check. entry_list is either dx_leaf->dl_list (from ocfs2_read_dx_leaf) or, for an inline root, dx_root->dr_entries. A crafted on-disk image can set de_num_used (and de_count, which is the __counted_by_le() bound of de_entries) to 0xffff and make the walk read far past the end of the 4KB metadata block, giving a slab out-of-bounds read reachable from any path lookup, stat() or open() on an indexed directory once the image is mounted. Commit 775c17386a6f ("ocfs2: validate dx_root extent list fields during block read") already bounds dr_list for the non-inline dx_root, but left the inline dr_entries path and the dx_leaf dl_list unchecked. Add the same read-time validation for both entry lists: de_count must equal the capacity of the block (ocfs2_dx_entries_per_leaf()/per_root()) and de_num_used must not exceed de_count, rejecting corrupted metadata with -EFSCORRUPTED before ocfs2_dx_dir_search() can walk an out-of-range entry array. de_count is always written as exactly the block capacity when a leaf or inline root is formatted, so the equality check does not reject any valid image. Found by 0sec automated security-research tooling (https://0sec.ai). Link: https://lore.kernel.org/20260713205625.92391-1-doruk@0sec.ai Fixes: 9b7895efac90 ("ocfs2: Add a name indexed b-tree to directory inodes") Fixes: 4ed8a6bb083b ("ocfs2: Store dir index records inline") Assisted-by: 0sec:claude-opus-4-8 Signed-off-by: Doruk Tan Ozturk Reviewed-by: Joseph Qi Cc: Joel Becker Cc: Kees Cook Cc: Mark Fasheh Cc: Junxiao Bi Cc: Changwei Ge Cc: Jun Piao Cc: Heming Zhao Cc: Signed-off-by: Andrew Morton diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c index 047d1b486f4a..7e09a5a4d49e 100644 --- a/fs/ocfs2/dir.c +++ b/fs/ocfs2/dir.c @@ -625,6 +625,28 @@ static int ocfs2_validate_dx_root(struct super_block *sb, le16_to_cpu(el->l_count)); goto bail; } + } else { + struct ocfs2_dx_entry_list *dl_list = &dx_root->dr_entries; + + if (le16_to_cpu(dl_list->de_count) != + ocfs2_dx_entries_per_root(sb)) { + ret = ocfs2_error(sb, + "Dir Index Root # %llu has invalid de_count %u (expected %u)\n", + (unsigned long long)le64_to_cpu(dx_root->dr_blkno), + le16_to_cpu(dl_list->de_count), + ocfs2_dx_entries_per_root(sb)); + goto bail; + } + + if (le16_to_cpu(dl_list->de_num_used) > + le16_to_cpu(dl_list->de_count)) { + ret = ocfs2_error(sb, + "Dir Index Root # %llu has invalid de_num_used %u (de_count %u)\n", + (unsigned long long)le64_to_cpu(dx_root->dr_blkno), + le16_to_cpu(dl_list->de_num_used), + le16_to_cpu(dl_list->de_count)); + goto bail; + } } bail: @@ -664,10 +686,25 @@ static int ocfs2_validate_dx_leaf(struct super_block *sb, return ret; } - if (!OCFS2_IS_VALID_DX_LEAF(dx_leaf)) { - ret = ocfs2_error(sb, "Dir Index Leaf has bad signature %.*s\n", - 7, dx_leaf->dl_signature); - } + if (!OCFS2_IS_VALID_DX_LEAF(dx_leaf)) + return ocfs2_error(sb, "Dir Index Leaf has bad signature %.*s\n", + 7, dx_leaf->dl_signature); + + if (le16_to_cpu(dx_leaf->dl_list.de_count) != + ocfs2_dx_entries_per_leaf(sb)) + return ocfs2_error(sb, + "Dir Index Leaf # %llu has invalid de_count %u (expected %u)\n", + (unsigned long long)le64_to_cpu(dx_leaf->dl_blkno), + le16_to_cpu(dx_leaf->dl_list.de_count), + ocfs2_dx_entries_per_leaf(sb)); + + if (le16_to_cpu(dx_leaf->dl_list.de_num_used) > + le16_to_cpu(dx_leaf->dl_list.de_count)) + return ocfs2_error(sb, + "Dir Index Leaf # %llu has invalid de_num_used %u (de_count %u)\n", + (unsigned long long)le64_to_cpu(dx_leaf->dl_blkno), + le16_to_cpu(dx_leaf->dl_list.de_num_used), + le16_to_cpu(dx_leaf->dl_list.de_count)); return ret; }