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: [email protected] Closes: https://lore.kernel.org/all/[email protected]/ Fixes: 744a56389f73 ("ext4: replace deprecated strncpy with alternatives") Signed-off-by: Kees Cook <[email protected]> --- Cc: "Theodore Ts'o" <[email protected]> Cc: Justin Stitt <[email protected]> Cc: Andreas Dilger <[email protected]> Cc: [email protected] --- fs/ext4/ext4.h | 2 +- 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))) -- 2.34.1
