linux-hardening - Re: [PATCH] crypto: sun8i-ce - Use kcalloc() instead of kzalloc()

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Message-ID: <1876185.tdWV9SEqCh@jernej-laptop>
Date: Tue, 23 Jan 2024 18:45:07 +0100
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: Corentin Labbe <clabbe.montjoie@...il.com>,
 Herbert Xu <herbert@...dor.apana.org.au>,
 "David S. Miller" <davem@...emloft.net>, Chen-Yu Tsai <wens@...e.org>,
 Samuel Holland <samuel@...lland.org>, Jonathan Corbet <corbet@....net>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Erick Archer <erick.archer@....com>
Cc: Erick Archer <erick.archer@....com>, linux-crypto@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] crypto: sun8i-ce - Use kcalloc() instead of kzalloc()

Dne nedelja, 21. januar 2024 ob 16:34:07 CET je Erick Archer napisal(a):
> As noted in the "Deprecated Interfaces, Language Features, Attributes,
> and Conventions" documentation [1], size calculations (especially
> multiplication) should not be performed in memory allocator (or similar)
> function arguments due to the risk of them overflowing. This could lead
> to values wrapping around and a smaller allocation being made than the
> caller was expecting. Using those allocations could lead to linear
> overflows of heap memory and other misbehaviors.
> 
> So, use the purpose specific kcalloc() function instead of the argument
> size * count in the kzalloc() function.
> 
> Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
> Link: https://github.com/KSPP/linux/issues/162
> Signed-off-by: Erick Archer <erick.archer@....com>

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej