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Date: Sat, 30 Jan 2021 16:46:30 +0800
From: butt3rflyh4ck <butterflyhuangxx@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Linux kernel: linux-block: nbd: use-after-free Read in nbd_queue_rq
the patch for this issue in upstream:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b98e762e3d71e893b221f871825dc64694cfb258
Regards,
butt3rflyh4ck.
On Fri, Jan 29, 2021 at 2:10 AM butt3rflyh4ck <butterflyhuangxx@...il.com>
wrote:
> Hi, I reported a use-after-free Read bug in ndb_queue_rq() in
> drivers/block/nbd.c and reproduced in linux-5.11.0-rc4+ too.
>
> Root Cause:
>
> There is a race condition in nbd ioctl.
> NBD_SET_SIZE_BLOCKS ioctl will call nbd_size_set(), it will change the
> block size.
> NBD_SET_SOCK ioctl will call nbd_add_socket() and it will invoke
> krealloc() to update a block, free and realloc a new one.
> But nbd_queue_rq() is in runtime. and calls nbd_handle_cmd(), there
> will use config->sock. there accesses to config->socks without any locking.
>
> Patch for this issue:
>
> https://lore.kernel.org/linux-block/24dff677353e2e30a71d8b66c4dffdbdf77c4dbd.1611595239.git.josef@toxicpanda.com/
>
> CVE assigned:
> not assigned.
>
> Timeline:
> *2021/1/25 - Vulnerability reported to security@...nel.org.
> *2020/1/26 - Vulnerability confirmed and patched.
> *2020/1/28 - Vulnerability reported to linux-distros@...openwall.org.
> *2021/1/29 - Opened on oss-security@...ts.openwall.com.
>
> Credit:
> This issue was discovered by the ADLab of venustech.
>
>
> Regards,
> butt3rflyh4ck.
>
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