diff options
| author | Kees Cook <keescook@chromium.org> | 2024-05-23 15:54:12 -0700 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2024-07-05 13:14:51 -0400 |
| commit | be27cd64461c45a6088a91a04eba5cd44e1767ef (patch) | |
| tree | 4176a9e7543490df24787d87297e2a90d2f6a9ac | |
| parent | 7c73ddb7589fb8ddb1136b6306dfb72089c81511 (diff) | |
ext4: use memtostr_pad() for s_volume_name
As with the other strings in struct ext4_super_block, s_volume_name is
not NUL terminated. The other strings were marked in commit 072ebb3bffe6
("ext4: add nonstring annotations to ext4.h"). Using strscpy() isn't
the right replacement for strncpy(); it should use memtostr_pad()
instead.
Reported-by: syzbot+50835f73143cc2905b9e@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/00000000000019f4c00619192c05@google.com/
Fixes: 744a56389f73 ("ext4: replace deprecated strncpy with alternatives")
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://patch.msgid.link/20240523225408.work.904-kees@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/ext4.h | 2 | ||||
| -rw-r--r-- | fs/ext4/ioctl.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 983dad8c07ec..efed7f09876d 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1347,7 +1347,7 @@ struct ext4_super_block { /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ __le32 s_feature_ro_compat; /* readonly-compatible feature set */ /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ -/*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */ +/*78*/ char s_volume_name[EXT4_LABEL_MAX] __nonstring; /* volume name */ /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ /* diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index dab7acd49709..e8bf5972dd47 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -1151,7 +1151,7 @@ static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX); lock_buffer(sbi->s_sbh); - strscpy_pad(label, sbi->s_es->s_volume_name); + memtostr_pad(label, sbi->s_es->s_volume_name); unlock_buffer(sbi->s_sbh); if (copy_to_user(user_label, label, sizeof(label))) |