linux-kernel - [PATCH] hfsplus: Fix bug causing custom uid and gid being unable to be assigned with mount

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Date:   Fri, 2 Dec 2022 15:39:36 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     "willy@...radead.org" <willy@...radead.org>,
        "ira.weiny@...el.com" <ira.weiny@...el.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "bvanassche@....org" <bvanassche@....org>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "songmuchun@...edance.com" <songmuchun@...edance.com>,
        "slava@...eyko.com" <slava@...eyko.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] hfsplus: Fix bug causing custom uid and gid being unable to
 be assigned with mount

From: Aditya Garg <gargaditya08@...e.com>

Inspite of specifying UID and GID in mount command, the specified UID and
GID was not being assigned. This patch fixes this issue.

Signed-off-by: Aditya Garg <gargaditya08@...e.com>
---
 fs/hfsplus/hfsplus_fs.h | 2 ++
 fs/hfsplus/inode.c      | 4 ++--
 fs/hfsplus/options.c    | 2 ++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index a5db2e3b2..6aa919e59 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -198,6 +198,8 @@ struct hfsplus_sb_info {
 #define HFSPLUS_SB_HFSX		3
 #define HFSPLUS_SB_CASEFOLD	4
 #define HFSPLUS_SB_NOBARRIER	5
+#define HFSPLUS_SB_UID		6
+#define HFSPLUS_SB_GID		7
 
 static inline struct hfsplus_sb_info *HFSPLUS_SB(struct super_block *sb)
 {
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index aeab83ed1..4d1077db8 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -192,11 +192,11 @@ static void hfsplus_get_perms(struct inode *inode,
 	mode = be16_to_cpu(perms->mode);
 
 	i_uid_write(inode, be32_to_cpu(perms->owner));
-	if (!i_uid_read(inode) && !mode)
+	if (test_bit(HFSPLUS_SB_UID, &sbi->flags))
 		inode->i_uid = sbi->uid;
 
 	i_gid_write(inode, be32_to_cpu(perms->group));
-	if (!i_gid_read(inode) && !mode)
+	if (test_bit(HFSPLUS_SB_GID, &sbi->flags))
 		inode->i_gid = sbi->gid;
 
 	if (dir) {
diff --git a/fs/hfsplus/options.c b/fs/hfsplus/options.c
index 047e05c57..10a0bdacb 100644
--- a/fs/hfsplus/options.c
+++ b/fs/hfsplus/options.c
@@ -137,6 +137,7 @@ int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
 				return 0;
 			}
 			sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
+			set_bit(HFSPLUS_SB_UID, &sbi->flags);
 			if (!uid_valid(sbi->uid)) {
 				pr_err("invalid uid specified\n");
 				return 0;
@@ -148,6 +149,7 @@ int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
 				return 0;
 			}
 			sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
+			set_bit(HFSPLUS_SB_GID, &sbi->flags);
 			if (!gid_valid(sbi->gid)) {
 				pr_err("invalid gid specified\n");
 				return 0;
-- 
2.38.1