linux-ext4 - [PATCH AUTOSEL 6.11 234/244] ext4: filesystems without casefold feature cannot be mounted with siphash

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Message-ID: <20240925113641.1297102-234-sashal@kernel.org>
Date: Wed, 25 Sep 2024 07:27:35 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Lizhi Xu <lizhi.xu@...driver.com>,
	syzbot+340581ba9dceb7e06fb3@...kaller.appspotmail.com,
	Theodore Ts'o <tytso@....edu>,
	Sasha Levin <sashal@...nel.org>,
	adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org
Subject: [PATCH AUTOSEL 6.11 234/244] ext4: filesystems without casefold feature cannot be mounted with siphash

From: Lizhi Xu <lizhi.xu@...driver.com>

[ Upstream commit 985b67cd86392310d9e9326de941c22fc9340eec ]

When mounting the ext4 filesystem, if the default hash version is set to
DX_HASH_SIPHASH but the casefold feature is not set, exit the mounting.

Reported-by: syzbot+340581ba9dceb7e06fb3@...kaller.appspotmail.com
Signed-off-by: Lizhi Xu <lizhi.xu@...driver.com>
Link: https://patch.msgid.link/20240605012335.44086-1-lizhi.xu@windriver.com
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ext4/super.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e72145c4ae5a0..25cd0d662e31b 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3582,6 +3582,13 @@ int ext4_feature_set_ok(struct super_block *sb, int readonly)
 			 "mounted without CONFIG_UNICODE");
 		return 0;
 	}
+	if (EXT4_SB(sb)->s_es->s_def_hash_version == DX_HASH_SIPHASH &&
+	    !ext4_has_feature_casefold(sb)) {
+		ext4_msg(sb, KERN_ERR,
+			 "Filesystem without casefold feature cannot be "
+			 "mounted with siphash");
+		return 0;
+	}
 
 	if (readonly)
 		return 1;
-- 
2.43.0