mirror of https://gitee.com/openkylin/linux.git
38b78a5f18
Generally permission checking is not necessary when overlayfs looks up a dentry on one of the underlying layers, since search permission on base directory was already checked in ovl_permission(). More specifically using lookup_one_len() causes a problem when the lower directory lacks search permission for a specific user while the upper directory does have search permission. Since lookups are cached, this causes inconsistency in behavior: success depends on who did the first lookup. So instead use lookup_hash() which doesn't do the permission check. Reported-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| copy_up.c | ||
| dir.c | ||
| inode.c | ||
| overlayfs.h | ||
| readdir.c | ||
| super.c | ||