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smb: client: disable path remapping with POSIX extensions 

If SMB 3.1.1 POSIX Extensions are available and negotiated, the client
should be able to use all characters and not remap anything. Currently, the
user has to explicitly request this behavior by specifying the "nomapposix"
mount option.

Link: https://lore.kernel.org/4195bb677b33d680e77549890a4f4dd3b474ceaf.camel@rx2.rx-server.de
Signed-off-by: Philipp Kerling <pkerling@casix.org>
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
pull/1265/head
Philipp Kerling 2025-06-08 20:59:00 +02:00 committed by Steve French
parent 19272b37aa
commit 9331005366
2 changed files with 10 additions and 2 deletions
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2
Documentation/admin-guide/cifs/usage.rst
View File

@ -270,6 +270,8 @@ configured for Unix Extensions (and the client has not disabled
illegal Windows/NTFS/SMB characters to a remap range (this mount parameter
is the default for SMB3). This remap (``mapposix``) range is also
compatible with Mac (and "Services for Mac" on some older Windows).
When POSIX Extensions for SMB 3.1.1 are negotiated, remapping is automatically
disabled.
CIFS VFS Mount Options
======================

10
fs/smb/client/connect.c
View File

@ -3718,9 +3718,15 @@ int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx)
goto out;
}
/* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
if (tcon->posix_extensions)
/*
* if new SMB3.11 POSIX extensions are supported, do not change anything in the
* path (i.e., do not remap / and \ and do not map any special characters)
*/
if (tcon->posix_extensions) {
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
cifs_sb->mnt_cifs_flags &= ~(CIFS_MOUNT_MAP_SFM_CHR |
CIFS_MOUNT_MAP_SPECIAL_CHR);
}
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
/* tell server which Unix caps we support */