linux-kernel - Re: [PATCH] overflow: improve size

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Message-ID: <f8ed52f5-51e0-4fe4-a1f9-d840979f52a8@stanley.mountain>
Date: Mon, 18 Nov 2024 11:13:40 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Kees Cook <kees@...nel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] overflow: improve size_add/mul for 32bit systems

On Mon, Nov 18, 2024 at 09:09:28AM +0300, Dan Carpenter wrote:
> On 32bit systems, if you pass a long long to size_add()/mul() the top
> 32 bits are truncated away so the function doesn't work as expected.
> Add a test to prevent this.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---

Sorry, I thought I had build tested this, but actually I didn't build test it
enough...  Probably the kbuild bot will complain soon.

regards,
dan carpenter