From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 511FD2DC4A1; Mon, 14 Apr 2025 13:31:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744637518; cv=none; b=lpdFipsxnAMsfszINoz9JCZLv4bj+lBB4RZfDWDPrp6Iw40o0jPyFeLIjlqgtBKUWLVc5tNIz53/qik0gQO0KfR7RriC8dixgMNz9zqLp/a9EuGEPo+qWsMODG6Ffi4K9y2TkrKPF5IpXza9KRgUesAgLughLW56ghCho8LY0/c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744637518; c=relaxed/simple; bh=pBZh8wT0+j+ZRwXzPPAwRPNP7IBvQaVC7He6ZqpVwRo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=YhDt497sujjFhRIPhwgnHCzQQV7OeYuEKh6TVNSX4ExwwtOw96WNKhad+gqAM6PYFEd0xBXAiBAqIs0j0/FYqvBW1iYdZpmfAVCmCaSzAnBGo7VdJsJ4ybVP3f6FF/VN/QmMJpnoFKSySLl2oYHPtyGKrTWYyNtkSZ4L+3Or84M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=N8JS3pkB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="N8JS3pkB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE10AC4CEEF; Mon, 14 Apr 2025 13:31:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744637518; bh=pBZh8wT0+j+ZRwXzPPAwRPNP7IBvQaVC7He6ZqpVwRo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N8JS3pkBHwCftunvKDBZCpAZa+zvFO1irFagFJEEL+T8B/0++wYsN/4JiQaKXTesX hK5HeXJ9WoNSYRxTFIsgrtEb/CRwi89GVgvbfvZxyUiRPCbqg/skMcPr6NFVCalEBL mTfnZTDErkEEcfmYJrIvpOuq1wmPW1DGtyRMJd2eBIaB6V3NMxnJT2I0NG14egOyzd vrqRZDPCF1D1SJiEwjKp6gdkN5P8wgHbpjLJhLBMeGA8g46WZiEnnHf3TWx2w7QT6N GyeKEUAiwjaMw2qXaxqOJAVZpPXo2s6Zuqj4cr8DYYDiZjqzvzyEuby+1SbXSFVJOB wBGVuRUmmiPlw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ojaswin Mujoo , Baokun Li , Jan Kara , Zhang Yi , Theodore Ts'o , Sasha Levin , adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 15/15] ext4: make block validity check resistent to sb bh corruption Date: Mon, 14 Apr 2025 09:31:25 -0400 Message-Id: <20250414133126.680846-15-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250414133126.680846-1-sashal@kernel.org> References: <20250414133126.680846-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.180 Content-Transfer-Encoding: 8bit From: Ojaswin Mujoo [ Upstream commit ccad447a3d331a239477c281533bacb585b54a98 ] Block validity checks need to be skipped in case they are called for journal blocks since they are part of system's protected zone. Currently, this is done by checking inode->ino against sbi->s_es->s_journal_inum, which is a direct read from the ext4 sb buffer head. If someone modifies this underneath us then the s_journal_inum field might get corrupted. To prevent against this, change the check to directly compare the inode with journal->j_inode. **Slight change in behavior**: During journal init path, check_block_validity etc might be called for journal inode when sbi->s_journal is not set yet. In this case we now proceed with ext4_inode_block_valid() instead of returning early. Since systems zones have not been set yet, it is okay to proceed so we can perform basic checks on the blocks. Suggested-by: Baokun Li Reviewed-by: Baokun Li Reviewed-by: Jan Kara Reviewed-by: Zhang Yi Signed-off-by: Ojaswin Mujoo Link: https://patch.msgid.link/0c06bc9ebfcd6ccfed84a36e79147bf45ff5adc1.1743142920.git.ojaswin@linux.ibm.com Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/ext4/block_validity.c | 5 ++--- fs/ext4/inode.c | 7 ++++--- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c index 6fe3c941b5651..4d6ba140276b5 100644 --- a/fs/ext4/block_validity.c +++ b/fs/ext4/block_validity.c @@ -351,10 +351,9 @@ int ext4_check_blockref(const char *function, unsigned int line, { __le32 *bref = p; unsigned int blk; + journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; - if (ext4_has_feature_journal(inode->i_sb) && - (inode->i_ino == - le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_journal_inum))) + if (journal && inode == journal->j_inode) return 0; while (bref < p+max) { diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 87e6187e6584b..88992594b4724 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -409,10 +409,11 @@ static int __check_block_validity(struct inode *inode, const char *func, unsigned int line, struct ext4_map_blocks *map) { - if (ext4_has_feature_journal(inode->i_sb) && - (inode->i_ino == - le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_journal_inum))) + journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; + + if (journal && inode == journal->j_inode) return 0; + if (!ext4_inode_block_valid(inode, map->m_pblk, map->m_len)) { ext4_error_inode(inode, func, line, map->m_pblk, "lblock %lu mapped to illegal pblock %llu " -- 2.39.5