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ksmbd: fix translation in ksmbd_acls_fattr()

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When creating new filesystem objects ksmbd translates between k*ids and
s*ids. For this it often uses struct smb_fattr and stashes the k*ids in
cf_uid and cf_gid. Let cf_uid and cf_gid always contain the final
information taking any potential idmapped mounts into account. When
finally translation cf_*id into s*ids translate them into the user
namespace of ksmbd since that is the relevant user namespace 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>
This commit is contained in:
Christian Brauner 2021-08-23 17:13:50 +02:00 committed by Steve French
parent 3cdc20e72c
commit 43205ca719
2 changed files with 11 additions and 9 deletions
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12
fs/ksmbd/smb2pdu.c
View file

@ -2381,10 +2381,12 @@ static int smb2_create_sd_buffer(struct ksmbd_work *work,
le32_to_cpu(sd_buf->ccontext.DataLength), true);
}
static void ksmbd_acls_fattr(struct smb_fattr *fattr, struct inode *inode)
static void ksmbd_acls_fattr(struct smb_fattr *fattr,
struct user_namespace *mnt_userns,
struct inode *inode)
{
fattr->cf_uid = inode->i_uid;
fattr->cf_gid = inode->i_gid;
fattr->cf_uid = i_uid_into_mnt(mnt_userns, inode);
fattr->cf_gid = i_gid_into_mnt(mnt_userns, inode);
fattr->cf_mode = inode->i_mode;
fattr->cf_acls = NULL;
fattr->cf_dacls = NULL;
@ -2893,7 +2895,7 @@ int smb2_open(struct ksmbd_work *work)
struct smb_ntsd *pntsd;
int pntsd_size, ace_num = 0;
ksmbd_acls_fattr(&fattr, inode);
ksmbd_acls_fattr(&fattr, user_ns, inode);
if (fattr.cf_acls)
ace_num = fattr.cf_acls->a_count;
if (fattr.cf_dacls)
@ -5006,7 +5008,7 @@ static int smb2_get_info_sec(struct ksmbd_work *work,
user_ns = file_mnt_user_ns(fp->filp);
inode = file_inode(fp->filp);
ksmbd_acls_fattr(&fattr, inode);
ksmbd_acls_fattr(&fattr, user_ns, inode);
if (test_share_config_flag(work->tcon->share_conf,
KSMBD_SHARE_FLAG_ACL_XATTR))

8
fs/ksmbd/smbacl.c
View file

@ -723,7 +723,7 @@ static void set_mode_dacl(struct user_namespace *user_ns,
}
/* owner RID */
uid = from_kuid(user_ns, fattr->cf_uid);
uid = from_kuid(&init_user_ns, fattr->cf_uid);
if (uid)
sid = &server_conf.domain_sid;
else
@ -739,7 +739,7 @@ static void set_mode_dacl(struct user_namespace *user_ns,
ace_size = fill_ace_for_sid(pace, &sid_unix_groups,
ACCESS_ALLOWED, 0, fattr->cf_mode, 0070);
pace->sid.sub_auth[pace->sid.num_subauth++] =
cpu_to_le32(from_kgid(user_ns, fattr->cf_gid));
cpu_to_le32(from_kgid(&init_user_ns, fattr->cf_gid));
pace->size = cpu_to_le16(ace_size + 4);
size += le16_to_cpu(pace->size);
pace = (struct smb_ace *)((char *)pndace + size);
@ -880,7 +880,7 @@ int build_sec_desc(struct user_namespace *user_ns,
if (!nowner_sid_ptr)
return -ENOMEM;
uid = from_kuid(user_ns, fattr->cf_uid);
uid = from_kuid(&init_user_ns, fattr->cf_uid);
if (!uid)
sid_type = SIDUNIX_USER;
id_to_sid(uid, sid_type, nowner_sid_ptr);
@ -891,7 +891,7 @@ int build_sec_desc(struct user_namespace *user_ns,
return -ENOMEM;
}
gid = from_kgid(user_ns, fattr->cf_gid);
gid = from_kgid(&init_user_ns, fattr->cf_gid);
id_to_sid(gid, SIDUNIX_GROUP, ngroup_sid_ptr);
offset = sizeof(struct smb_ntsd);