linux-kernel - Re: [PATCH] mm/vmalloc: Sanitize __get_vm

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Date:   Sat, 4 Apr 2020 09:35:02 -0600
From:   William Kucharski <william.kucharski@...cle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, jroedel@...e.de,
        vbabka@...e.cz, urezki@...il.com,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re:   [PATCH] mm/vmalloc: Sanitize __get_vm_area() arguments

Is there any need to similarly sanitize “size” to assure start + size doesn’t go past “end?”

> On Apr 3, 2020, at 10:33, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> 
> __get_vm_area() is an exported symbol, make sure the callers stay in
> the expected memory range. When calling this function with memory
> ranges outside of the VMALLOC range *bad* things can happen.