From: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
To: syzbot <syzbot+582e66e5edf36a22c7b0@syzkaller.appspotmail.com>,
"clm@fb.com" <clm@fb.com>, "dsterba@suse.com" <dsterba@suse.com>,
"josef@toxicpanda.com" <josef@toxicpanda.com>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"syzkaller-bugs@googlegroups.com"
<syzkaller-bugs@googlegroups.com>
Subject: Re: KASAN: use-after-free Read in btrfs_scan_one_device
Date: Mon, 21 Sep 2020 08:22:48 +0000 [thread overview]
Message-ID: <SN4PR0401MB3598EF5CB8F9D6419DC236DB9B3A0@SN4PR0401MB3598.namprd04.prod.outlook.com> (raw)
In-Reply-To: 000000000000c9e14b05afcc41ba@google.com
On 21/09/2020 07:38, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 325d0eab Merge branch 'akpm' (patches from Andrew)
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1512df53900000
> kernel config: https://syzkaller.appspot.com/x/.config?x=6a8a2ae52ed737db
> dashboard link: https://syzkaller.appspot.com/bug?extid=582e66e5edf36a22c7b0
> compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12366f8b900000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14e6929b900000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+582e66e5edf36a22c7b0@syzkaller.appspotmail.com
>
> ==================================================================
> BUG: KASAN: use-after-free in btrfs_printk+0x3eb/0x435 fs/btrfs/super.c:245
> Read of size 8 at addr ffff8880878e06a8 by task syz-executor225/7068
>
> CPU: 1 PID: 7068 Comm: syz-executor225 Not tainted 5.9.0-rc5-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x1d6/0x29e lib/dump_stack.c:118
> print_address_description+0x66/0x620 mm/kasan/report.c:383
> __kasan_report mm/kasan/report.c:513 [inline]
> kasan_report+0x132/0x1d0 mm/kasan/report.c:530
> btrfs_printk+0x3eb/0x435 fs/btrfs/super.c:245
> device_list_add+0x1a88/0x1d60 fs/btrfs/volumes.c:943
> btrfs_scan_one_device+0x196/0x490 fs/btrfs/volumes.c:1359
> btrfs_mount_root+0x48f/0xb60 fs/btrfs/super.c:1634
> legacy_get_tree+0xea/0x180 fs/fs_context.c:592
> vfs_get_tree+0x88/0x270 fs/super.c:1547
> fc_mount fs/namespace.c:978 [inline]
> vfs_kern_mount+0xc9/0x160 fs/namespace.c:1008
> btrfs_mount+0x33c/0xae0 fs/btrfs/super.c:1732
> legacy_get_tree+0xea/0x180 fs/fs_context.c:592
> vfs_get_tree+0x88/0x270 fs/super.c:1547
> do_new_mount fs/namespace.c:2875 [inline]
> path_mount+0x179d/0x29e0 fs/namespace.c:3192
> do_mount fs/namespace.c:3205 [inline]
> __do_sys_mount fs/namespace.c:3413 [inline]
> __se_sys_mount+0x126/0x180 fs/namespace.c:3390
> do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x44840a
> Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 cd a2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 aa a2 fb ff c3 66 0f 1f 84 00 00 00 00 00
> RSP: 002b:00007ffedfffd608 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5
> RAX: ffffffffffffffda RBX: 00007ffedfffd670 RCX: 000000000044840a
> RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffedfffd630
> RBP: 00007ffedfffd630 R08: 00007ffedfffd670 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000001a
> R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
>
> Allocated by task 6945:
> kasan_save_stack mm/kasan/common.c:48 [inline]
> kasan_set_track mm/kasan/common.c:56 [inline]
> __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461
> kmalloc_node include/linux/slab.h:577 [inline]
> kvmalloc_node+0x81/0x110 mm/util.c:574
> kvmalloc include/linux/mm.h:757 [inline]
> kvzalloc include/linux/mm.h:765 [inline]
> btrfs_mount_root+0xd0/0xb60 fs/btrfs/super.c:1613
> legacy_get_tree+0xea/0x180 fs/fs_context.c:592
> vfs_get_tree+0x88/0x270 fs/super.c:1547
> fc_mount fs/namespace.c:978 [inline]
> vfs_kern_mount+0xc9/0x160 fs/namespace.c:1008
> btrfs_mount+0x33c/0xae0 fs/btrfs/super.c:1732
> legacy_get_tree+0xea/0x180 fs/fs_context.c:592
> vfs_get_tree+0x88/0x270 fs/super.c:1547
> do_new_mount fs/namespace.c:2875 [inline]
> path_mount+0x179d/0x29e0 fs/namespace.c:3192
> do_mount fs/namespace.c:3205 [inline]
> __do_sys_mount fs/namespace.c:3413 [inline]
> __se_sys_mount+0x126/0x180 fs/namespace.c:3390
> do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> Freed by task 6945:
> kasan_save_stack mm/kasan/common.c:48 [inline]
> kasan_set_track+0x3d/0x70 mm/kasan/common.c:56
> kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355
> __kasan_slab_free+0xdd/0x110 mm/kasan/common.c:422
> __cache_free mm/slab.c:3418 [inline]
> kfree+0x113/0x200 mm/slab.c:3756
> deactivate_locked_super+0xa7/0xf0 fs/super.c:335
> btrfs_mount_root+0x72b/0xb60 fs/btrfs/super.c:1678
> legacy_get_tree+0xea/0x180 fs/fs_context.c:592
> vfs_get_tree+0x88/0x270 fs/super.c:1547
> fc_mount fs/namespace.c:978 [inline]
> vfs_kern_mount+0xc9/0x160 fs/namespace.c:1008
> btrfs_mount+0x33c/0xae0 fs/btrfs/super.c:1732
> legacy_get_tree+0xea/0x180 fs/fs_context.c:592
> vfs_get_tree+0x88/0x270 fs/super.c:1547
> do_new_mount fs/namespace.c:2875 [inline]
> path_mount+0x179d/0x29e0 fs/namespace.c:3192
> do_mount fs/namespace.c:3205 [inline]
> __do_sys_mount fs/namespace.c:3413 [inline]
> __se_sys_mount+0x126/0x180 fs/namespace.c:3390
> do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> The buggy address belongs to the object at ffff8880878e0000
> which belongs to the cache kmalloc-16k of size 16384
> The buggy address is located 1704 bytes inside of
> 16384-byte region [ffff8880878e0000, ffff8880878e4000)
> The buggy address belongs to the page:
> page:0000000060704f30 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x878e0
> head:0000000060704f30 order:3 compound_mapcount:0 compound_pincount:0
> flags: 0xfffe0000010200(slab|head)
> raw: 00fffe0000010200 ffffea00028e9a08 ffffea00021e3608 ffff8880aa440b00
> raw: 0000000000000000 ffff8880878e0000 0000000100000001 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff8880878e0580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8880878e0600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> ffff8880878e0680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff8880878e0700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8880878e0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
>
>
Could reporoduce this one, working on it
next prev parent reply other threads:[~2020-09-21 8:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-20 14:12 KASAN: use-after-free Read in btrfs_scan_one_device syzbot
2020-09-21 5:38 ` syzbot
2020-09-21 8:22 ` Johannes Thumshirn [this message]
2020-09-21 8:53 ` Johannes Thumshirn
2020-09-21 8:53 ` syzbot
2020-09-21 8:53 ` syzbot
2020-09-30 16:57 ` David Sterba
2020-09-30 18:05 ` David Sterba
2020-10-01 13:05 ` Dmitry Vyukov
2020-10-01 13:08 ` Dmitry Vyukov
2020-10-01 13:35 ` David Sterba
2020-10-12 20:56 ` Rustam Kovhaev
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=SN4PR0401MB3598EF5CB8F9D6419DC236DB9B3A0@SN4PR0401MB3598.namprd04.prod.outlook.com \
--to=johannes.thumshirn@wdc.com \
--cc=clm@fb.com \
--cc=dsterba@suse.com \
--cc=josef@toxicpanda.com \
--cc=linux-btrfs@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=syzbot+582e66e5edf36a22c7b0@syzkaller.appspotmail.com \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).