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Message-ID: <1d287c7e-8aff-beea-1bd6-4b2226f9f3db@opensource.wdc.com>
Date: Thu, 17 Feb 2022 19:49:11 +0900
From: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To: Kirill Tkhai <ktkhai@...tuozzo.com>,
"agk@...hat.com" <agk@...hat.com>,
"snitzer@...hat.com" <snitzer@...hat.com>,
"dm-devel@...hat.com" <dm-devel@...hat.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v2] dm: Fix use-after-free in
dm_cleanup_zoned_dev()
On 2/17/22 19:13, Kirill Tkhai wrote:
>
> dm_cleanup_zoned_dev() uses queue, so it must be called
> before blk_cleanup_disk() starts its killing:
>
> blk_cleanup_disk->blk_cleanup_queue()->kobject_put()->blk_release_queue()->
> ->...RCU...->blk_free_queue_rcu()->kmem_cache_free()
>
> Otherwise, RCU callback may be executed first,
> and dm_cleanup_zoned_dev() touches freed memory:
Mike,
Can you queue this please ?
>
> BUG: KASAN: use-after-free in dm_cleanup_zoned_dev+0x33/0xd0
> Read of size 8 at addr ffff88805ac6e430 by task dmsetup/681
>
> CPU: 4 PID: 681 Comm: dmsetup Not tainted 5.17.0-rc2+ #6
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
> Call Trace:
> <TASK>
> dump_stack_lvl+0x57/0x7d
> print_address_description.constprop.0+0x1f/0x150
> ? dm_cleanup_zoned_dev+0x33/0xd0
> kasan_report.cold+0x7f/0x11b
> ? dm_cleanup_zoned_dev+0x33/0xd0
> dm_cleanup_zoned_dev+0x33/0xd0
> __dm_destroy+0x26a/0x400
> ? dm_blk_ioctl+0x230/0x230
> ? up_write+0xd8/0x270
> dev_remove+0x156/0x1d0
> ctl_ioctl+0x269/0x530
> ? table_clear+0x140/0x140
> ? lock_release+0xb2/0x750
> ? remove_all+0x40/0x40
> ? rcu_read_lock_sched_held+0x12/0x70
> ? lock_downgrade+0x3c0/0x3c0
> ? rcu_read_lock_sched_held+0x12/0x70
> dm_ctl_ioctl+0xa/0x10
> __x64_sys_ioctl+0xb9/0xf0
> do_syscall_64+0x3b/0x90
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7fb6dfa95c27
> Code: 00 00 00 48 8b 05 69 92 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 39 92 0c 00 f7 d8 64 89 01 48
> RSP: 002b:00007fff882c6c28 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007fb6dfb73a8e RCX: 00007fb6dfa95c27
> RDX: 00007fb6e01d7ca0 RSI: 00000000c138fd04 RDI: 0000000000000003
> RBP: 00007fff882c6ce0 R08: 00007fb6dfbc3558 R09: 00007fff882c6a90
> R10: 00007fb6dfbc28a2 R11: 0000000000000206 R12: 00007fb6dfbc28a2
> R13: 00007fb6dfbc28a2 R14: 00007fb6dfbc28a2 R15: 00007fb6dfbc28a2
> </TASK>
>
> Allocated by task 673:
> kasan_save_stack+0x1e/0x40
> __kasan_slab_alloc+0x66/0x80
> kmem_cache_alloc_node+0x1ca/0x460
> blk_alloc_queue+0x33/0x4e0
> __blk_alloc_disk+0x1b/0x60
> dm_create+0x368/0xa20
> dev_create+0xb9/0x170
> ctl_ioctl+0x269/0x530
> dm_ctl_ioctl+0xa/0x10
> __x64_sys_ioctl+0xb9/0xf0
> do_syscall_64+0x3b/0x90
> entry_SYSCALL_64_after_hwframe+0x44/0xae
>
> Freed by task 0:
> kasan_save_stack+0x1e/0x40
> kasan_set_track+0x21/0x30
> kasan_set_free_info+0x20/0x30
> __kasan_slab_free+0xfb/0x130
> slab_free_freelist_hook+0x7d/0x150
> kmem_cache_free+0x13c/0x340
> rcu_do_batch+0x2d9/0x820
> rcu_core+0x3b8/0x570
> __do_softirq+0x1c4/0x63d
>
> Last potentially related work creation:
> kasan_save_stack+0x1e/0x40
> __kasan_record_aux_stack+0x96/0xa0
> call_rcu+0xc4/0x8f0
> kobject_put+0xd9/0x270
> disk_release+0xee/0x120
> device_release+0x59/0xf0
> kobject_put+0xd9/0x270
> cleanup_mapped_device+0x12b/0x1b0
> __dm_destroy+0x26a/0x400
> dev_remove+0x156/0x1d0
> ctl_ioctl+0x269/0x530
> dm_ctl_ioctl+0xa/0x10
> __x64_sys_ioctl+0xb9/0xf0
> do_syscall_64+0x3b/0x90
> entry_SYSCALL_64_after_hwframe+0x44/0xae
>
> The buggy address belongs to the object at ffff88805ac6e180
> which belongs to the cache request_queue of size 2992
> The buggy address is located 688 bytes inside of
> 2992-byte region [ffff88805ac6e180, ffff88805ac6ed30)
> The buggy address belongs to the page:
> page:000000000837df3c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5ac68
> head:000000000837df3c order:3 compound_mapcount:0 compound_pincount:0
> flags: 0xfffffc0010200(slab|head|node=0|zone=1|lastcpupid=0x1fffff)
> raw: 000fffffc0010200 0000000000000000 dead000000000122 ffff888001e58280
> raw: 0000000000000000 00000000800a000a 00000001ffffffff 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff88805ac6e300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88805ac6e380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >ffff88805ac6e400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff88805ac6e480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88805ac6e500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
>
> Fixes: bb37d77239af "dm: introduce zone append emulation"
> Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
> Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
> ---
> v2: Split long commit message line and delete [xxx] time prefix from kernel output.
>
> drivers/md/dm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index dcbd6d201619..d472fe5dbc1d 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -1607,6 +1607,7 @@ static void cleanup_mapped_device(struct mapped_device *md)
> md->dax_dev = NULL;
> }
>
> + dm_cleanup_zoned_dev(md);
> if (md->disk) {
> spin_lock(&_minor_lock);
> md->disk->private_data = NULL;
> @@ -1627,7 +1628,6 @@ static void cleanup_mapped_device(struct mapped_device *md)
> mutex_destroy(&md->swap_bios_lock);
>
> dm_mq_cleanup_mapped_device(md);
> - dm_cleanup_zoned_dev(md);
> }
>
> /*
>
--
Damien Le Moal
Western Digital Research
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