linux-kernel - Re: KASAN: use-after-free Read in usbhid

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Date:   Wed, 24 Jul 2019 16:17:35 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     syzbot <syzbot+ef5de9c4f99c4edb4e49@...kaller.appspotmail.com>,
        andreyknvl@...gle.com, syzkaller-bugs@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: KASAN: use-after-free Read in usbhid_power

Am Dienstag, den 23.07.2019, 05:48 -0700 schrieb syzbot:
> 
> Freed by task 243:
>   save_stack+0x1b/0x80 /mm/kasan/common.c:71
>   set_track /mm/kasan/common.c:79 [inline]
>   __kasan_slab_free+0x130/0x180 /mm/kasan/common.c:451
>   slab_free_hook /mm/slub.c:1421 [inline]
>   slab_free_freelist_hook /mm/slub.c:1448 [inline]
>   slab_free /mm/slub.c:2994 [inline]
>   kfree+0xd7/0x280 /mm/slub.c:3949
>   skb_free_head+0x8b/0xa0 /net/core/skbuff.c:588
>   skb_release_data+0x41f/0x7c0 /net/core/skbuff.c:608
>   skb_release_all+0x46/0x60 /net/core/skbuff.c:662
>   __kfree_skb /net/core/skbuff.c:676 [inline]
>   consume_skb /net/core/skbuff.c:736 [inline]
>   consume_skb+0xc0/0x2f0 /net/core/skbuff.c:730
>   skb_free_datagram+0x16/0xf0 /net/core/datagram.c:328
>   netlink_recvmsg+0x65e/0xea0 /net/netlink/af_netlink.c:2001
>   sock_recvmsg_nosec /net/socket.c:877 [inline]
>   sock_recvmsg /net/socket.c:894 [inline]
>   sock_recvmsg+0xca/0x110 /net/socket.c:890
>   ___sys_recvmsg+0x271/0x5a0 /net/socket.c:2448
>   __sys_recvmsg+0xe9/0x1b0 /net/socket.c:2497
>   do_syscall_64+0xb7/0x560 /arch/x86/entry/common.c:301
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe

How reliable is this trace? It seems very likely to me that this bug
is the same bug as

syzbot <syzbot+ded1794a717e3b235226@...kaller.appspotmail.com>
KASAN: use-after-free Read in hidraw_ioctl

which shows a race with disconnect() instead of some networking code,
which I really cannot fathom.

	Regards
		Oliver