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 194B359C983; Thu, 17 Sep 2026 16:01:58 +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=1789660919; cv=none; b=UvmrgJyLJtY0uL4Qt7matYxRUrcfh2BeuSjn6BLpsqZq4FwNssGvKT5pMri0osSrBoxRiAgLwxpxd8GgJZpei9CC56wO2ayUuJugQ/sL9WEv2c8Mz5qzWfyXgjsudtdLABvXACYC/nKokVPp7s2EqtjllJddV0OAdvSqkdphdK4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789660919; c=relaxed/simple; bh=zkwMT6JNgS03cctPhNuYNokdNP3gq/Dtuwuo3cSl72M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Udnjs/F8rhtzVvSrZx5JCBZZMJV7sVYo0fylExyQg9Vdin4IOakRIT76VMnh+YeNj83Purtb3rZp90xMcVZcSqVTai78tWDyQ9qUFiOnA5mseipMpstqsY6OsuMMLdFlJDexhYHKywe4I+QBP438BVBL4SCkTs2ywy5f7u9PMS4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=p7TFHc/L; 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="p7TFHc/L" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6E7841F00893; Thu, 17 Sep 2026 16:01:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789660918; bh=wwMDog6dCnCPBoW1ZXDB++owAHCwPoKJZ2iOwmgUxP0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=p7TFHc/Lo+eggNFXkefo+TWRxBVWji4d/POcna17ihvN0r1vnCqMRj3KYjKGUCpNw JdX6ZkAZIW4cBaf3eAqEz3LjeZfhpCau3zQR1hBT68qAQQJkIh5S4Bbri0FfHZ0vqS /xE9LmOII81mFKUI7853AwGF8NdQSO8Lxlq900hc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Goldwyn Rodrigues , Mimi Zohar , Sasha Levin Subject: [PATCH 6.18 0022/1250] ima: return error early if file xattr cannot be changed Date: Thu, 17 Sep 2026 15:56:57 +0100 Message-ID: <20260917151552.530433909@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260917151551.901433442@linuxfoundation.org> References: <20260917151551.901433442@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Goldwyn Rodrigues [ Upstream commit 69fc6474236d9edda6983623e4282f2bdfd8e3d8 ] During early boot, the filesystem is read-only and any changes to xattrs are not allowed. This fails in case of ext4 because changing xattr starts an ext4 transaction which fails with the following warning. WARNING: fs/ext4/ext4_jbd2.c:75 at ext4_journal_check_start+0x63/0xa0 [ext4], CPU#1: systemd-sysroot/561 CPU: 1 UID: 0 PID: 561 Comm: systemd-sysroot Not tainted 6.19.12-1-default #1 PREEMPT(voluntary) openSUSE Tumbleweed c2dfc3c9d9f6f1233251c5d4410574fe82a348ee Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022 RIP: 0010:ext4_journal_check_start+0x63/0xa0 [ext4] Call Trace: __ext4_journal_start_sb+0x3e/0x180 [ext4 6d025f3bc52c89a957b89a89d211fadf5e9434e1] ext4_xattr_set+0x104/0x150 [ext4 6d025f3bc52c89a957b89a89d211fadf5e9434e1] __vfs_setxattr+0x9a/0xd0 __vfs_setxattr_noperm+0x76/0x1f0 ima_appraise_measurement+0x23e/0xe40 ima_d_path+0x5a/0xd0 process_measurement+0xb29/0xc40 ? copy_from_kernel_nofault+0x21/0xe0 ? fscrypt_file_open+0xc0/0xe0 ? ext4_file_open+0x60/0x490 [ext4 6d025f3bc52c89a957b89a89d211fadf5e9434e1] ? bpf_prog_31efb7c56239148b_restrict_filesystems+0xab/0x126 ? __bpf_prog_exit+0x23/0xd0 ? __bpf_tramp_exit+0xd/0x50 ? bpf_trampoline_6442530367+0x9f/0xea ima_file_check+0x57/0x80 security_file_post_open+0x50/0xf0 path_openat+0x493/0x1650 do_filp_open+0xc7/0x170 Detect the state of the file early and return the error. Signed-off-by: Goldwyn Rodrigues Signed-off-by: Mimi Zohar Signed-off-by: Sasha Levin --- security/integrity/ima/ima_appraise.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 6a33484fcd6fe..a87ef7c05f11e 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -90,6 +90,11 @@ static int ima_fix_xattr(struct dentry *dentry, struct ima_iint_cache *iint) int rc, offset; u8 algo = iint->ima_hash->algo; + if (IS_RDONLY(d_inode(dentry))) + return -EROFS; + if (IS_IMMUTABLE(d_inode(dentry))) + return -EPERM; + if (algo <= HASH_ALGO_SHA1) { offset = 1; iint->ima_hash->xattr.sha1.type = IMA_XATTR_DIGEST; -- 2.53.0