This is a note to let you know that I've just added the patch titled
ext4: filesystems without casefold feature cannot be mounted with siphash
to the 6.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-filesystems-without-casefold-feature-cannot-be-.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0c20ddfb36a0f028d11cdc03949cf1bc95ebb360
Author: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx>
Date: Wed Jun 5 09:23:35 2024 +0800
ext4: filesystems without casefold feature cannot be mounted with siphash
[ 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@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20240605012335.44086-1-lizhi.xu@xxxxxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 7e73e13741d1e..cecea19908109 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;
