linux-kernel - Re: [PATCH v5 4/6] x86/microcode/AMD: Check microcode container data in the late loader

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Message-ID: <9cf234e8-4d96-46f0-70e0-7d60d49671d8@maciej.szmigiero.name>
Date:   Wed, 2 May 2018 02:47:39 +0200
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/6] x86/microcode/AMD: Check microcode container data
 in the late loader

On 01.05.2018 22:03, Borislav Petkov wrote:
> On Tue, May 01, 2018 at 06:19:56PM +0200, Maciej S. Szmigiero wrote:
>> -EINVAL cast to unsigned int is 4294967274 and this value is also
>> a valid count of bytes to skip that this function can return.
> 
> And where exactly in the *old* code do we do that?
> 

The old code returned this value as a signed int, but then any
"patch_size" value (which is u32) above INT_MAX read from a section header
wrapped around to a negative pseudo-error code (which likely didn't match
any actual error number).

Maciej