linux-kernel - Re: [PATCH v2 21/24] x86/sgx: use vmalloc

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Message-ID: <487cc70c-9cb1-2b00-acb3-a1410c8be7c0@intel.com>
Date:   Tue, 27 Jun 2023 08:06:12 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     Jarkko Sakkinen <jarkko@...nel.org>,
        kernel-janitors@...r.kernel.org, keescook@...omium.org,
        christophe.jaillet@...adoo.fr, kuba@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 21/24] x86/sgx: use vmalloc_array and vcalloc

On 6/27/23 08:01, Julia Lawall wrote:
> If it is certain that no overflow is possible, then perhaps it is fine to
> drop the patch? 

It's impossible in practice in this case because the code is 64-bit only
and uses an 'unsigned long'.  But, like I said, I can see that same
vmalloc() being copied-and-pasted or moved to a 32-bit system and
theoretically causing problems in rare scenarios.

I'd probably just drop this patch.