Commit c3c1716d authored by Jan Kara's avatar Jan Kara Committed by Yongjian Sun
Browse files

ext4: avoid remount errors with 'abort' mount option 

mainline inclusion
from mainline-v6.12-rc3
commit 76486b104168ae59703190566e372badf433314b
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB2YWS
CVE: CVE-2024-50191

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76486b104168ae59703190566e372badf433314b



--------------------------------

When we remount filesystem with 'abort' mount option while changing
other mount options as well (as is LTP test doing), we can return error
from the system call after commit d3476f3dad4a ("ext4: don't set
SB_RDONLY after filesystem errors") because the application of mount
option changes detects shutdown filesystem and refuses to do anything.
The behavior of application of other mount options in presence of
'abort' mount option is currently rather arbitary as some mount option
changes are handled before 'abort' and some after it.

Move aborting of the filesystem to the end of remount handling so all
requested changes are properly applied before the filesystem is shutdown
to have a reasonably consistent behavior.

Fixes: d3476f3dad4a ("ext4: don't set SB_RDONLY after filesystem errors")
Reported-by: default avatarJan Stancek <jstancek@redhat.com>
Link: https://lore.kernel.org/all/Zvp6L+oFnfASaoHl@t14s


Signed-off-by: default avatarJan Kara <jack@suse.cz>
Tested-by: default avatarJan Stancek <jstancek@redhat.com>
Link: https://patch.msgid.link/20241004221556.19222-1-jack@suse.cz


Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Signed-off-by: default avatarYongjian Sun <sunyongjian1@huawei.com>
parent 18400fe8

fs/ext4/super.c

+8 −3
Original line number Diff line number Diff line
@@ -6662,9 +6662,6 @@ static int __ext4_remount(struct fs_context *fc, struct super_block *sb) 
		goto restore_opts;

	}



	if (test_opt2(sb, ABORT))

		ext4_abort(sb, ESHUTDOWN, "Abort forced by user");



	sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |

		(test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
@@ -6833,6 +6830,14 @@ static int __ext4_remount(struct fs_context *fc, struct super_block *sb) 
	if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))

		ext4_stop_mmpd(sbi);



	/*

	 * Handle aborting the filesystem as the last thing during remount to

	 * avoid obsure errors during remount when some option changes fail to

	 * apply due to shutdown filesystem.

	 */

	if (test_opt2(sb, ABORT))

		ext4_abort(sb, ESHUTDOWN, "Abort forced by user");



	return 0;



restore_opts: