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gfs2: fix kernel BUG in gfs2_quota_cleanup

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[Syz report]
kernel BUG at fs/gfs2/quota.c:1508!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5060 Comm: syz-executor505 Not tainted 6.7.0-rc3-syzkaller-00134-g994d5c58e50e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:gfs2_quota_cleanup+0x6b5/0x6c0 fs/gfs2/quota.c:1508
Code: fe e9 cf fd ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 2d fe ff ff 4c 89 ef e8 b6 19 23 fe e9 20 fe ff ff e8 ec 11 c7 fd 90 <0f> 0b e8 84 9c 4f 07 0f 1f 40 00 66 0f 1f 00 55 41 57 41 56 41 54
RSP: 0018:ffffc9000409f9e0 EFLAGS: 00010293
RAX: ffffffff83c76854 RBX: 0000000000000002 RCX: ffff888026001dc0
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc9000409fb00 R08: ffffffff83c762b0 R09: 1ffff1100fd38015
R10: dffffc0000000000 R11: ffffed100fd38016 R12: dffffc0000000000
R13: ffff88807e9c0828 R14: ffff888014693580 R15: ffff88807e9c0000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f16d1bd70f8 CR3: 0000000027199000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 gfs2_put_super+0x2e1/0x940 fs/gfs2/super.c:611
 generic_shutdown_super+0x13a/0x2c0 fs/super.c:696
 kill_block_super+0x44/0x90 fs/super.c:1667
 deactivate_locked_super+0xc1/0x130 fs/super.c:484
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1256
 task_work_run+0x24a/0x300 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa34/0x2750 kernel/exit.c:871
 do_group_exit+0x206/0x2c0 kernel/exit.c:1021
 __do_sys_exit_group kernel/exit.c:1032 [inline]
 __se_sys_exit_group kernel/exit.c:1030 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1030
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
...

[pid  5060] fsconfig(4, FSCONFIG_CMD_RECONFIGURE, NULL, NULL, 0) = 0
[pid  5060] exit_group(1)               = ?
...

[Analysis]
When the task exits, it will execute cleanup_mnt() to recycle the mounted gfs2
file system, but it performs a system call fsconfig(4, FSCONFIG_CMD_RECONFIGURE,
NULL, NULL, 0) before executing the task exit operation.

This will execute the following kernel path to complete the setting of
SDF_JOURNAL_LIVE for sd_flags:

SYSCALL_DEFINE5(fsconfig, ..)->
	vfs_fsconfig_locked()->
		vfs_cmd_reconfigure()->
			gfs2_reconfigure()->
				gfs2_make_fs_rw()->
					set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);

[Fix]
Add SDF_NORECOVERY check in gfs2_quota_cleanup() to avoid checking
SDF_JOURNAL_LIVE on the path where gfs2 is being unmounted.

Reported-and-tested-by: syzbot+3b6e67ac2b646da57862@syzkaller.appspotmail.com
Fixes: f66af88e33 ("gfs2: Stop using gfs2_make_fs_ro for withdraw")
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Edward Adam Davis 2023-12-02 17:25:49 +08:00 committed by Andreas Gruenbacher
parent 1181f2d9fe
commit 71733b4922
1 changed files with 2 additions and 1 deletions
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3
fs/gfs2/quota.c
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@ -1505,7 +1505,8 @@ void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
LIST_HEAD(dispose);
int count;
BUG_ON(test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
BUG_ON(!test_bit(SDF_NORECOVERY, &sdp->sd_flags) &&
test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
spin_lock(&qd_lock);
list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {