diff options
| author |   Steve French <stfrench@microsoft.com> | 2019-06-24 02:01:42 -0500 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-07-07 22:37:43 -0500 |
| commit | 412094a8fb0711e9f332bed6723aa59706a4ff7e (patch) | |
| tree | 8c8bb1162dff355aa8c428adda25114eb845905f /fs/cifs/connect.c | |
| parent | smb3: Allow query of symlinks stored as reparse points (diff) | |
| download | linux-dev-412094a8fb0711e9f332bed6723aa59706a4ff7e.tar.xz linux-dev-412094a8fb0711e9f332bed6723aa59706a4ff7e.zip | |
smb3: add new mount option to retrieve mode from special ACE
There is a special ACE used by some servers to allow the mode
bits to be stored. This can be especially helpful in scenarios
in which the client is trusted, and access checking on the
client vs the POSIX mode bits is sufficient.
Add mount option to allow enabling this behavior.
Follow on patch will add support for chmod and queryinfo
(stat) by retrieving the POSIX mode bits from the special
ACE, SID: S-1-5-88-3
See e.g.
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/hh509017(v=ws.10)
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | fs/cifs/connect.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 1eb73149e6d4..07c9cd7637c5 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -96,7 +96,7 @@ enum { Opt_multiuser, Opt_sloppy, Opt_nosharesock, Opt_persistent, Opt_nopersistent, Opt_resilient, Opt_noresilient, - Opt_domainauto, Opt_rdma, + Opt_domainauto, Opt_rdma, Opt_modesid, /* Mount options which take numeric value */ Opt_backupuid, Opt_backupgid, Opt_uid, @@ -175,6 +175,7 @@ static const match_table_t cifs_mount_option_tokens = { { Opt_serverino, "serverino" }, { Opt_noserverino, "noserverino" }, { Opt_rwpidforward, "rwpidforward" }, + { Opt_modesid, "modefromsid" }, { Opt_cifsacl, "cifsacl" }, { Opt_nocifsacl, "nocifsacl" }, { Opt_acl, "acl" }, @@ -1830,6 +1831,9 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, case Opt_rwpidforward: vol->rwpidforward = 1; break; + case Opt_modesid: + vol->mode_ace = 1; + break; case Opt_cifsacl: vol->cifs_acl = 1; break; @@ -3976,6 +3980,8 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info, cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL; if (pvolume_info->rwpidforward) cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD; + if (pvolume_info->mode_ace) + cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID; if (pvolume_info->cifs_acl) cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL; if (pvolume_info->backupuid_specified) { |