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| author |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2018-07-20 21:56:47 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-07-20 23:44:35 -0700 |
| commit | 488dee96bb62f0b3d9e678cf42574034d5b033a5 (patch) | |
| tree | 2969d47ffb0ffeaf15d20ffb0eda78a2bb694a40 /fs/kernfs/symlink.c | |
| parent | net: Init backlog NAPI's gro_hash. (diff) | |
| download | wireguard-linux-488dee96bb62f0b3d9e678cf42574034d5b033a5.tar.xz wireguard-linux-488dee96bb62f0b3d9e678cf42574034d5b033a5.zip | |
kernfs: allow creating kernfs objects with arbitrary uid/gid
This change allows creating kernfs files and directories with arbitrary
uid/gid instead of always using GLOBAL_ROOT_UID/GID by extending
kernfs_create_dir_ns() and kernfs_create_file_ns() with uid/gid arguments.
The "simple" kernfs_create_file() and kernfs_create_dir() are left alone
and always create objects belonging to the global root.
When creating symlinks ownership (uid/gid) is taken from the target kernfs
object.
Co-Developed-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/kernfs/symlink.c')
| -rw-r--r-- | fs/kernfs/symlink.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/kernfs/symlink.c b/fs/kernfs/symlink.c index 08ccabd7047f..5ffed48f3d0e 100644 --- a/fs/kernfs/symlink.c +++ b/fs/kernfs/symlink.c @@ -21,6 +21,7 @@ * @target: target node for the symlink to point to * * Returns the created node on success, ERR_PTR() value on error. + * Ownership of the link matches ownership of the target. */ struct kernfs_node *kernfs_create_link(struct kernfs_node *parent, const char *name, @@ -28,8 +29,16 @@ struct kernfs_node *kernfs_create_link(struct kernfs_node *parent, { struct kernfs_node *kn; int error; + kuid_t uid = GLOBAL_ROOT_UID; + kgid_t gid = GLOBAL_ROOT_GID; - kn = kernfs_new_node(parent, name, S_IFLNK|S_IRWXUGO, KERNFS_LINK); + if (target->iattr) { + uid = target->iattr->ia_iattr.ia_uid; + gid = target->iattr->ia_iattr.ia_gid; + } + + kn = kernfs_new_node(parent, name, S_IFLNK|S_IRWXUGO, uid, gid, + KERNFS_LINK); if (!kn) return ERR_PTR(-ENOMEM); |