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smb: client: fix uid/gid override in getattr with posix extensions

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When mounting with 'multiuser,posix' options, cifs_getattr() overrides
the server-provided uid/gid with the current process's fsuid/fsgid.
This is because the condition only checks for unix extensions
(tcon->unix_ext) but not posix extensions (tcon->posix_extensions).

With SMB3 POSIX extensions, the server provides real uid/gid values
just like with unix extensions, so they should be preserved rather
than replaced with the caller's credentials.

Add a tcon->posix_extensions check to the condition so that uid/gid
from the server are properly reported in stat results.

Reported-by: Arthur Lesuisse <arthur.lesuisse@ulb.be>
Closes: https://lore.kernel.org/r/DB9P190MB2012266F6B8DECBE5D26A1798DB52@DB9P190MB2012.EURP190.PROD.OUTLOOK.COM
Suggested-by: Arthur Lesuisse <arthur.lesuisse@ulb.be>
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Shyam Prasad N <sprasad@microsoft.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Bharath SM <bharathsm@microsoft.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Paulo Alcantara 2026-09-06 14:39:44 -03:00
parent 5520e89a5a
commit cf4d358966
1 changed files with 4 additions and 4 deletions
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8
fs/smb/client/inode.c
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@ -2992,14 +2992,14 @@ int cifs_getattr(struct mnt_idmap *idmap, const struct path *path,
stat->attributes |= STATX_ATTR_ENCRYPTED;
/*
* If on a multiuser mount without unix extensions or cifsacl being
* enabled, and the admin hasn't overridden them, set the ownership
* to the fsuid/fsgid of the current process.
* If on a multiuser mount without unix extensions, posix extensions
* or cifsacl being enabled, and the admin hasn't overridden them,
* set the ownership to the fsuid/fsgid of the current process.
*/
sbflags = cifs_sb_flags(cifs_sb);
if ((sbflags & CIFS_MOUNT_MULTIUSER) &&
!(sbflags & CIFS_MOUNT_CIFS_ACL) &&
!tcon->unix_ext) {
!tcon->unix_ext && !tcon->posix_extensions) {
if (!(sbflags & CIFS_MOUNT_OVERR_UID))
stat->uid = current_fsuid();
if (!(sbflags & CIFS_MOUNT_OVERR_GID))