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ext4: fix error message when rejecting the default hash

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commit a2187431c395cdfbf144e3536f25468c64fc7cfa upstream.

Commit 985b67cd8639 ("ext4: filesystems without casefold feature cannot
be mounted with siphash") properly rejects volumes where
s_def_hash_version is set to DX_HASH_SIPHASH, but the check and the
error message should not look into casefold setup - a filesystem should
never have DX_HASH_SIPHASH as the default hash.  Fix it and, since we
are there, move the check to ext4_hash_info_init.

Fixes:985b67cd8639 ("ext4: filesystems without casefold feature cannot
be mounted with siphash")

Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://patch.msgid.link/87jzg1en6j.fsf_-_@mailhost.krisman.be
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gabriel Krisman Bertazi
2026-01-08 12:03:50 -03:00
committed by Greg Kroah-Hartman
parent 52c4538a92
commit 0eb7d3da25
2 changed files with 18 additions and 11 deletions
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1
fs/ext4/ext4.h
View File

@@ -2459,6 +2459,7 @@ static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
#define DX_HASH_HALF_MD4_UNSIGNED 4
#define DX_HASH_TEA_UNSIGNED 5
#define DX_HASH_SIPHASH 6
#define DX_HASH_LAST DX_HASH_SIPHASH
static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
const void *address, unsigned int length)

28
fs/ext4/super.c
View File

@@ -3632,14 +3632,6 @@ int ext4_feature_set_ok(struct super_block *sb, int readonly)
}
#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;
@@ -5148,16 +5140,27 @@ out:
return ret;
}
static void ext4_hash_info_init(struct super_block *sb)
static int ext4_hash_info_init(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
unsigned int i;
sbi->s_def_hash_version = es->s_def_hash_version;
if (sbi->s_def_hash_version > DX_HASH_LAST) {
ext4_msg(sb, KERN_ERR,
"Invalid default hash set in the superblock");
return -EINVAL;
} else if (sbi->s_def_hash_version == DX_HASH_SIPHASH) {
ext4_msg(sb, KERN_ERR,
"SIPHASH is not a valid default hash value");
return -EINVAL;
}
for (i = 0; i < 4; i++)
sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
sbi->s_def_hash_version = es->s_def_hash_version;
if (ext4_has_feature_dir_index(sb)) {
i = le32_to_cpu(es->s_flags);
if (i & EXT2_FLAGS_UNSIGNED_HASH)
@@ -5175,6 +5178,7 @@ static void ext4_hash_info_init(struct super_block *sb)
#endif
}
}
return 0;
}
static int ext4_block_group_meta_init(struct super_block *sb, int silent)
@@ -5319,7 +5323,9 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
if (err)
goto failed_mount;
ext4_hash_info_init(sb);
err = ext4_hash_info_init(sb);
if (err)
goto failed_mount;
err = ext4_handle_clustersize(sb);
if (err)