linux-ext4 - [PATCH v3 07/16] ext4: Report case sensitivity in fileattr

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260112174629.3729358-8-cel@kernel.org>
Date: Mon, 12 Jan 2026 12:46:20 -0500
From: Chuck Lever <cel@...nel.org>
To: vira@....codeaurora.org, Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>
Cc: <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org,
	linux-xfs@...r.kernel.org,
	linux-cifs@...r.kernel.org,
	<linux-nfs@...r.kernel.org>,
	linux-f2fs-devel@...ts.sourceforge.net,
	hirofumi@...l.parknet.co.jp,
	linkinjeon@...nel.org,
	sj1557.seo@...sung.com,
	yuezhang.mo@...y.com,
	almaz.alexandrovich@...agon-software.com,
	slava@...eyko.com,
	glaubitz@...sik.fu-berlin.de,
	frank.li@...o.com,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	cem@...nel.org,
	sfrench@...ba.org,
	pc@...guebit.org,
	ronniesahlberg@...il.com,
	sprasad@...rosoft.com,
	trondmy@...nel.org,
	anna@...nel.org,
	jaegeuk@...nel.org,
	chao@...nel.org,
	hansg@...nel.org,
	senozhatsky@...omium.org,
	Chuck Lever <chuck.lever@...cle.com>
Subject: [PATCH v3 07/16] ext4: Report case sensitivity in fileattr_get

From: Chuck Lever <chuck.lever@...cle.com>

Report ext4's case sensitivity behavior via file_kattr boolean
fields. ext4 always preserves case at rest.

Case sensitivity is a per-directory setting in ext4. If the queried
inode is a casefolded directory, report case-insensitive; otherwise
report case-sensitive (standard POSIX behavior).

Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
---
 fs/ext4/ioctl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 7ce0fc40aec2..653035017c7f 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -996,6 +996,14 @@ int ext4_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
 	if (ext4_has_feature_project(inode->i_sb))
 		fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 
+	/*
+	 * ext4 always preserves case. If this inode is a casefolded
+	 * directory, report case-insensitive; otherwise report
+	 * case-sensitive (standard POSIX behavior).
+	 */
+	fa->case_insensitive = IS_CASEFOLDED(inode);
+	fa->case_preserving = true;
+
 	return 0;
 }
 
-- 
2.52.0