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| author | Christian Brauner <christian.brauner@ubuntu.com> | 2021-08-24 20:10:20 +0900 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2021-09-03 23:29:45 -0500 |
| commit | 55cd04d75e635ac915bf54586ec64057249508ec (patch) | |
| tree | 465ebbdde91c73439cddec6b14fd2f9d7d9b7146 /fs | |
| parent | f0bb29d5c65b492ab82cce7b1e1dd00cbca28601 (diff) | |
| download | linux-55cd04d75e635ac915bf54586ec64057249508ec.tar.gz linux-55cd04d75e635ac915bf54586ec64057249508ec.tar.bz2 linux-55cd04d75e635ac915bf54586ec64057249508ec.zip | |
ksmbd: fix translation in sid_to_id()
The sid_to_id() functions is relevant when changing ownership of
filesystem objects based on acl information. In this case we need to
first translate the relevant s*ids into k*ids in ksmbd's user namespace
and account for any idmapped mounts. Requesting a change in ownership
requires the inverse translation to be applied when we would report
ownership to userspace. So k*id_from_mnt() must be used here.
Cc: Steve French <stfrench@microsoft.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Namjae Jeon <namjae.jeon@samsung.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: linux-cifs@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ksmbd/smbacl.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/fs/ksmbd/smbacl.c b/fs/ksmbd/smbacl.c index e49e9bcdec80..ef5896297607 100644 --- a/fs/ksmbd/smbacl.c +++ b/fs/ksmbd/smbacl.c @@ -275,8 +275,15 @@ static int sid_to_id(struct user_namespace *user_ns, id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]); if (id >= 0) { - uid = make_kuid(user_ns, id); - if (uid_valid(uid) && kuid_has_mapping(user_ns, uid)) { + /* + * Translate raw sid into kuid in the server's user + * namespace. + */ + uid = make_kuid(&init_user_ns, id); + + /* If this is an idmapped mount, apply the idmapping. */ + uid = kuid_from_mnt(user_ns, uid); + if (uid_valid(uid)) { fattr->cf_uid = uid; rc = 0; } @@ -287,8 +294,15 @@ static int sid_to_id(struct user_namespace *user_ns, id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]); if (id >= 0) { - gid = make_kgid(user_ns, id); - if (gid_valid(gid) && kgid_has_mapping(user_ns, gid)) { + /* + * Translate raw sid into kgid in the server's user + * namespace. + */ + gid = make_kgid(&init_user_ns, id); + + /* If this is an idmapped mount, apply the idmapping. */ + gid = kgid_from_mnt(user_ns, gid); + if (gid_valid(gid)) { fattr->cf_gid = gid; rc = 0; } |