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exfat: fix remount failure in different process environments

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The kernel test robot reported that the exFAT remount operation
failed. The reason for the failure was that the process's umask
is different between mount and remount, causing fs_fmask and
fs_dmask are changed.

Potentially, both gid and uid may also be changed. Therefore, when
initializing fs_context for remount, inherit these mount options
from the options used during mount.

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202511251637.81670f5c-lkp@intel.com
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Yuezhang Mo
2025-11-28 17:51:10 +08:00
committed by Namjae Jeon
parent d70a5804c5
commit 51fc7b4ce1
1 changed files with 15 additions and 4 deletions
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19
fs/exfat/super.c
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@@ -824,10 +824,21 @@ static int exfat_init_fs_context(struct fs_context *fc)
ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
sbi->options.fs_uid = current_uid();
sbi->options.fs_gid = current_gid();
sbi->options.fs_fmask = current->fs->umask;
sbi->options.fs_dmask = current->fs->umask;
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE && fc->root) {
struct super_block *sb = fc->root->d_sb;
struct exfat_mount_options *cur_opts = &EXFAT_SB(sb)->options;
sbi->options.fs_uid = cur_opts->fs_uid;
sbi->options.fs_gid = cur_opts->fs_gid;
sbi->options.fs_fmask = cur_opts->fs_fmask;
sbi->options.fs_dmask = cur_opts->fs_dmask;
} else {
sbi->options.fs_uid = current_uid();
sbi->options.fs_gid = current_gid();
sbi->options.fs_fmask = current->fs->umask;
sbi->options.fs_dmask = current->fs->umask;
}
sbi->options.allow_utime = -1;
sbi->options.errors = EXFAT_ERRORS_RO;
exfat_set_iocharset(&sbi->options, exfat_default_iocharset);