linux-kernel - [PATCH v2 3/3] udf: handle large user and group ID

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Date:   Thu, 28 Jan 2021 15:13:51 +0800
From:   bingjingc <bingjingc@...ology.com>
To:     viro@...iv.linux.org.uk, jack@...e.com, jack@...e.cz,
        axboe@...nel.dk, linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, cccheng@...ology.com,
        bingjingc@...ology.com, robbieko@...ology.com, willy@...radead.org,
        rdunlap@...radead.org
Subject: [PATCH v2 3/3] udf: handle large user and group ID

From: BingJing Chang <bingjingc@...ology.com>

If uid or gid of mount options is larger than INT_MAX, udf_fill_super will
return -EINVAL.

The problem can be encountered by a domain user or reproduced via:
mount -o loop,uid=2147483648 something-in-udf-format.iso /mnt

This can be fixed as commit 233a01fa9c4c ("fuse: handle large user and
group ID").

Reviewed-by: Robbie Ko <robbieko@...ology.com>
Reviewed-by: Chung-Chiang Cheng <cccheng@...ology.com>
Reviewed-by: Matthew Wilcox <willy@...radead.org>
Signed-off-by: BingJing Chang <bingjingc@...ology.com>
---
 fs/udf/super.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/udf/super.c b/fs/udf/super.c
index d0df217..2f83c12 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -459,6 +459,7 @@ static int udf_parse_options(char *options, struct udf_options *uopt,
 {
 	char *p;
 	int option;
+	unsigned int uv;
 
 	uopt->novrs = 0;
 	uopt->session = 0xFFFFFFFF;
@@ -508,17 +509,17 @@ static int udf_parse_options(char *options, struct udf_options *uopt,
 			uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
 			break;
 		case Opt_gid:
-			if (match_int(args, &option))
+			if (match_uint(args, &uv))
 				return 0;
-			uopt->gid = make_kgid(current_user_ns(), option);
+			uopt->gid = make_kgid(current_user_ns(), uv);
 			if (!gid_valid(uopt->gid))
 				return 0;
 			uopt->flags |= (1 << UDF_FLAG_GID_SET);
 			break;
 		case Opt_uid:
-			if (match_int(args, &option))
+			if (match_uint(args, &uv))
 				return 0;
-			uopt->uid = make_kuid(current_user_ns(), option);
+			uopt->uid = make_kuid(current_user_ns(), uv);
 			if (!uid_valid(uopt->uid))
 				return 0;
 			uopt->flags |= (1 << UDF_FLAG_UID_SET);
-- 
2.7.4