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Edward Adam Davis 4f234d5fcd gfs2: fix kernel BUG in gfs2_quota_cleanup 
[ Upstream commit 71733b4922 ]

[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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2024-01-25 15:35:17 -08:00
..
Kconfig fs: add CONFIG_BUFFER_HEAD 2023-08-02 09:13:09 -06:00
Makefile
…
acl.c gfs2: convert to ctime accessor functions 2023-07-24 10:29:59 +02:00
acl.h fs: port ->set_acl() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
aops.c gfs2 fixes 2023-09-05 13:00:28 -07:00
aops.h gfs2: support ludicrously large folios in gfs2_trans_add_databufs() 2023-06-19 16:19:30 -07:00
bmap.c gfs2 fixes 2023-09-05 13:00:28 -07:00
bmap.h gfs2: Eliminate gfs2_trim_blocks 2023-04-18 14:40:12 +02:00
dentry.c Reinstate "GFS2: free disk inode which is deleted by remote node -V2" 2023-03-23 19:37:56 +01:00
dir.c gfs2: convert to ctime accessor functions 2023-07-24 10:29:59 +02:00
dir.h
…
export.c
…
file.c dlm for 6.6 2023-08-31 15:02:12 -07:00
gfs2.h
…
glock.c gfs2: fix glock shrinker ref issues 2023-09-18 16:00:50 +02:00
glock.h gfs2: Remove LM_FLAG_PRIORITY flag 2023-09-05 15:58:16 +02:00
glops.c gfs2: Fix another freeze/thaw hang 2023-09-18 16:00:49 +02:00
glops.h
…
incore.h gfs2: change qd_slot_count to qd_slot_ref 2023-09-05 15:58:18 +02:00
inode.c gfs2: Silence "suspicious RCU usage in gfs2_permission" warning 2023-11-28 17:19:49 +00:00
inode.h fs: port ->permission() to pass mnt_idmap 2023-01-19 09:24:28 +01:00
lock_dlm.c gfs2: Remove LM_FLAG_PRIORITY flag 2023-09-05 15:58:16 +02:00
log.c gfs2: Sanitize kthread stopping 2023-09-05 15:58:17 +02:00
log.h
…
lops.c gfs2: Use mapping->gfp_mask for metadata inodes 2023-09-05 15:58:15 +02:00
lops.h
…
main.c gfs2: Rename "freeze_workqueue" to "gfs2_freeze" 2023-09-05 15:58:17 +02:00
meta_io.c gfs2: replace obvious uses of b_page with b_folio 2023-01-18 17:12:40 -08:00
meta_io.h
…
ops_fstype.c gfs2: don't withdraw if init_threads() got interrupted 2023-11-28 17:20:11 +00:00
quota.c gfs2: fix kernel BUG in gfs2_quota_cleanup 2024-01-25 15:35:17 -08:00
quota.h gfs2: Fix quota=quiet oversight 2023-09-18 16:26:24 +02:00
recovery.c gfs2: Rename "gfs_recovery" workqueue to "gfs2_recovery" 2023-09-05 15:58:17 +02:00
recovery.h gfs2: Rename "gfs_recovery" workqueue to "gfs2_recovery" 2023-09-05 15:58:17 +02:00
rgrp.c gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump 2024-01-25 15:35:17 -08:00
rgrp.h
…
super.c gfs2: Fix slab-use-after-free in gfs2_qd_dealloc 2023-11-28 17:19:47 +00:00
super.h gfs2: Fix asynchronous thread destruction 2023-09-05 15:58:17 +02:00
sys.c gfs2 fixes 2023-09-05 13:00:28 -07:00
sys.h
…
trace_gfs2.h
…
trans.c gfs2: Fix freeze consistency check in gfs2_trans_add_meta 2023-08-07 18:40:51 +02:00
trans.h
…
util.c gfs2: Fix withdraw race 2023-09-05 15:58:17 +02:00
util.h gfs2: gfs2_freeze_lock_shared cleanup 2023-07-03 22:30:26 +02:00
xattr.c gfs2: convert to ctime accessor functions 2023-07-24 10:29:59 +02:00
xattr.h
…