This is a note to let you know that I've just added the patch titled
cifs: mapchars mount option ignored
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cifs-mapchars-mount-option-ignored.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cb8b02fd6343228966324528adf920bfb8b8e681 Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@xxxxxxxxxxxxx>
Date: Wed, 24 May 2023 03:26:19 -0500
Subject: cifs: mapchars mount option ignored
From: Steve French <stfrench@xxxxxxxxxxxxx>
commit cb8b02fd6343228966324528adf920bfb8b8e681 upstream.
There are two ways that special characters (not allowed in some
other operating systems like Windows, but allowed in POSIX) have
been mapped in the past ("SFU" and "SFM" mappings) to allow them
to be stored in a range reserved for special chars. The default
for Linux has been to use "mapposix" (ie the SFM mapping) but
the conversion to the new mount API in the 5.11 kernel broke
the ability to override the default mapping of the reserved
characters (like '?' and '*' and '\') via "mapchars" mount option.
This patch fixes that - so can now mount with "mapchars"
mount option to override the default ("mapposix" ie SFM) mapping.
Reported-by: Tyler Spivey <tspivey8@xxxxxxxxx>
Fixes: 24e0a1eff9e2 ("cifs: switch to new mount api")
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/fs_context.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -904,6 +904,14 @@ static int smb3_fs_context_parse_param(s
ctx->sfu_remap = false; /* disable SFU mapping */
}
break;
+ case Opt_mapchars:
+ if (result.negated)
+ ctx->sfu_remap = false;
+ else {
+ ctx->sfu_remap = true;
+ ctx->remap = false; /* disable SFM (mapposix) mapping */
+ }
+ break;
case Opt_user_xattr:
if (result.negated)
ctx->no_xattr = 1;
Patches currently in stable-queue which might be from stfrench@xxxxxxxxxxxxx are
queue-6.3/cifs-fix-smb1-mount-regression.patch
queue-6.3/cifs-mapchars-mount-option-ignored.patch
queue-6.3/cifs-fix-cifs_limit_bvec_subset-to-correctly-check-the-maxmimum-size.patch
