From: Lizhi Xu <lizhi.xu@windriver.com> mainline inclusion from mainline-v6.12-rc1 commit 985b67cd86392310d9e9326de941c22fc9340eec category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYR8N CVE: CVE-2024-49968 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- 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@syzkaller.appspotmail.com Signed-off-by: Lizhi Xu <lizhi.xu@windriver.com> Link: https://patch.msgid.link/20240605012335.44086-1-lizhi.xu@windriver.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Conflicts: fs/ext4/super.c [Context differences.] Signed-off-by: Yongjian Sun <sunyongjian1@huawei.com> --- fs/ext4/super.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 46977d1d0ff5..76cd0e62281b 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3709,6 +3709,13 @@ int ext4_feature_set_ok(struct super_block *sb, int readonly) return 0; } #endif + 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; -- 2.39.2