linux-kernel - Re: [PATCH 1/2] kasan: detect negative size in memory operation function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20191014150506.GX32665@bombadil.infradead.org>
Date:   Mon, 14 Oct 2019 08:05:06 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Walter Wu <walter-zh.wu@...iatek.com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com
Subject: Re: [PATCH 1/2] kasan: detect negative size in memory operation
 function

On Mon, Oct 14, 2019 at 06:36:32PM +0800, Walter Wu wrote:
> @@ -110,8 +111,9 @@ void *memset(void *addr, int c, size_t len)
>  #undef memmove
>  void *memmove(void *dest, const void *src, size_t len)
>  {
> -	check_memory_region((unsigned long)src, len, false, _RET_IP_);
> -	check_memory_region((unsigned long)dest, len, true, _RET_IP_);
> +	if (!check_memory_region((unsigned long)src, len, false, _RET_IP_) ||
> +	!check_memory_region((unsigned long)dest, len, true, _RET_IP_))

This indentation is wrong.  Should be:
+	if (!check_memory_region((unsigned long)src, len, false, _RET_IP_) ||
+	    !check_memory_region((unsigned long)dest, len, true, _RET_IP_))

(also in one subsequent function)