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ext4: use memtostr_pad() for s_volume_name

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As with the other strings in struct ext4_super_block, s_volume_name is
not NUL terminated. The other strings were marked in commit 072ebb3bff
("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: 744a56389f ("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>
This commit is contained in:
Kees Cook 2024-05-23 15:54:12 -07:00 committed by Theodore Ts'o
parent 7c73ddb758
commit be27cd6446
2 changed files with 2 additions and 2 deletions
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2
fs/ext4/ext4.h
View File

@ -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 */
/*

2
fs/ext4/ioctl.c
View File

@ -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)))