From: Eric Biggers <ebigg...@google.com>
FS_IOC_SETFSLABEL modifies the filesystem superblock, so it shouldn't be
allowed to regular users. Require CAP_SYS_ADMIN, like xfs and btrfs do.
Fixes: 61a3da4d5ef8 ("f2fs: support FS_IOC_{GET,SET}FSLABEL")
Signed-off-by: Eric Biggers <ebigg...@google.com>
---
fs/f2fs/file.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 315127251bc1..6939cddc542a 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3113,6 +3113,9 @@ static int f2fs_set_volume_name(struct file *filp,
unsigned long arg)
char *vbuf;
int err = 0;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
vbuf = strndup_user((const char __user *)arg, FSLABEL_MAX);
if (IS_ERR(vbuf))
return PTR_ERR(vbuf);
--
2.22.0
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