linux-ext4 - [PATCH V6] fs/ext4: Filesystem without casefold feature cannot be mounted with spihash

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Message-ID: <20240605012335.44086-1-lizhi.xu@windriver.com>
Date: Wed, 5 Jun 2024 09:23:35 +0800
From: Lizhi Xu <lizhi.xu@...driver.com>
To: <krisman@...e.de>
CC: <adilger.kernel@...ger.ca>, <coreteam@...filter.org>,
        <davem@...emloft.net>, <ebiggers@...nel.org>, <fw@...len.de>,
        <jaegeuk@...nel.org>, <kadlec@...filter.org>, <kuba@...nel.org>,
        <linux-ext4@...r.kernel.org>, <linux-fscrypt@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <lizhi.xu@...driver.com>,
        <lkp@...el.com>, <llvm@...ts.linux.dev>, <netdev@...r.kernel.org>,
        <netfilter-devel@...r.kernel.org>, <oe-kbuild-all@...ts.linux.dev>,
        <pablo@...filter.org>,
        <syzbot+340581ba9dceb7e06fb3@...kaller.appspotmail.com>,
        <syzkaller-bugs@...glegroups.com>, <tytso@....edu>
Subject: [PATCH V6] fs/ext4: Filesystem without casefold feature cannot be mounted with spihash

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>
---
 fs/ext4/super.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c682fb927b64..d0645af3e66e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3593,6 +3593,14 @@ int ext4_feature_set_ok(struct super_block *sb, int readonly)
 			 "mounted without CONFIG_UNICODE");
 		return 0;
 	}
+#else
+	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 spihash");
+		return 0;
+	}
 #endif
 
 	if (readonly)
-- 
2.43.0