netdev - Re: [PATCH net v2] net/tls: fix slab-out-of-bounds bug in decrypt

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Date:   Thu, 31 Mar 2022 20:20:57 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Ziyang Xuan <william.xuanziyang@...wei.com>
Cc:     <borisp@...dia.com>, <john.fastabend@...il.com>,
        <daniel@...earbox.net>, <davem@...emloft.net>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <vakul.garg@....com>,
        <davejwatson@...com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net v2] net/tls: fix slab-out-of-bounds bug in
 decrypt_internal

On Thu, 31 Mar 2022 15:04:28 +0800 Ziyang Xuan wrote:
> The memory size of tls_ctx->rx.iv for AES128-CCM is 12 setting in
> tls_set_sw_offload(). The return value of crypto_aead_ivsize()
> for "ccm(aes)" is 16. So memcpy() require 16 bytes from 12 bytes
> memory space will trigger slab-out-of-bounds bug as following:
> 
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in decrypt_internal+0x385/0xc40 [tls]
> Read of size 16 at addr ffff888114e84e60 by task tls/10911

Reviewed-by: Jakub Kicinski <kuba@...nel.org>

Thanks!