diff options
| -rw-r--r-- | fs/namei.c | 10 | ||||
| -rw-r--r-- | include/linux/namei.h | 3 |
2 files changed, 9 insertions, 4 deletions
diff --git a/fs/namei.c b/fs/namei.c index eaf07f87cba5..53d815415810 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2296,13 +2296,16 @@ static const char *path_init(struct nameidata *nd, unsigned flags) nd->m_seq = read_seqbegin(&mount_lock); - /* Figure out the starting path and root (if needed). */ - if (*s == '/') { + /* Absolute pathname -- fetch the root (LOOKUP_IN_ROOT uses nd->dfd). */ + if (*s == '/' && !(flags & LOOKUP_IN_ROOT)) { error = nd_jump_root(nd); if (unlikely(error)) return ERR_PTR(error); return s; - } else if (nd->dfd == AT_FDCWD) { + } + + /* Relative pathname -- get the starting-point it is relative to. */ + if (nd->dfd == AT_FDCWD) { if (flags & LOOKUP_RCU) { struct fs_struct *fs = current->fs; unsigned seq; @@ -2342,6 +2345,7 @@ static const char *path_init(struct nameidata *nd, unsigned flags) } fdput(f); } + /* For scoped-lookups we need to set the root to the dirfd as well. */ if (flags & LOOKUP_IS_SCOPED) { nd->root = nd->path; diff --git a/include/linux/namei.h b/include/linux/namei.h index d2a98083be77..4e77068f7a1a 100644 --- a/include/linux/namei.h +++ b/include/linux/namei.h @@ -45,8 +45,9 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; #define LOOKUP_NO_MAGICLINKS 0x020000 /* No nd_jump_link() crossing. */ #define LOOKUP_NO_XDEV 0x040000 /* No mountpoint crossing. */ #define LOOKUP_BENEATH 0x080000 /* No escaping from starting point. */ +#define LOOKUP_IN_ROOT 0x100000 /* Treat dirfd as fs root. */ /* LOOKUP_* flags which do scope-related checks based on the dirfd. */ -#define LOOKUP_IS_SCOPED LOOKUP_BENEATH +#define LOOKUP_IS_SCOPED (LOOKUP_BENEATH | LOOKUP_IN_ROOT) extern int path_pts(struct path *path); |