linux-kernel - [PATCH v3] exfat: add the dummy mount options to be backward compatible with staging/exfat

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Fri, 22 May 2020 08:10:10 +0900
From:   Namjae Jeon <namjae.jeon@...sung.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        sandeen@...deen.net, viro@...iv.linux.org.uk, willy@...radead.org,
        Namjae Jeon <namjae.jeon@...sung.com>
Subject: [PATCH v3] exfat: add the dummy mount options to be backward
 compatible with staging/exfat

As Ubuntu and Fedora release new version used kernel version equal to or
higher than v5.4, They started to support kernel exfat filesystem.

Linus Torvalds reported mount error with new version of exfat on Fedora.

        exfat: Unknown parameter 'namecase'

This is because there is a difference in mount option between old
staging/exfat and new exfat.
And utf8, debug, and codepage options as well as namecase have been
removed from new exfat.

This patch add the dummy mount options as deprecated option to be backward
compatible with old one.

Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
---
 v2:
  - fix checkpatch.pl warning(Missing Signed-off-by).
 v3:
  - use fs_param_deprecated instead of printing deprecated warning(Matthew Wilcox).

 fs/exfat/super.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/fs/exfat/super.c b/fs/exfat/super.c
index 0565d5539d57..a846ff555656 100644
--- a/fs/exfat/super.c
+++ b/fs/exfat/super.c
@@ -203,6 +203,12 @@ enum {
 	Opt_errors,
 	Opt_discard,
 	Opt_time_offset,
+
+	/* Deprecated options */
+	Opt_utf8,
+	Opt_debug,
+	Opt_namecase,
+	Opt_codepage,
 };
 
 static const struct constant_table exfat_param_enums[] = {
@@ -223,6 +229,14 @@ static const struct fs_parameter_spec exfat_parameters[] = {
 	fsparam_enum("errors",			Opt_errors, exfat_param_enums),
 	fsparam_flag("discard",			Opt_discard),
 	fsparam_s32("time_offset",		Opt_time_offset),
+	__fsparam(NULL, "utf8",			Opt_utf8, fs_param_deprecated,
+		  NULL),
+	__fsparam(NULL, "debug",		Opt_debug, fs_param_deprecated,
+		  NULL),
+	__fsparam(fs_param_is_u32, "namecase",	Opt_namecase,
+		  fs_param_deprecated, NULL),
+	__fsparam(fs_param_is_u32, "codepage",	Opt_codepage,
+		  fs_param_deprecated, NULL),
 	{}
 };
 
@@ -278,6 +292,11 @@ static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param)
 			return -EINVAL;
 		opts->time_offset = result.int_32;
 		break;
+	case Opt_utf8:
+	case Opt_debug:
+	case Opt_namecase:
+	case Opt_codepage:
+		break;
 	default:
 		return -EINVAL;
 	}
-- 
2.17.1