linux-kernel - Re: [PATCH] lib: test_overflow: Avoid taining the kernel and fix wrap size

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Message-ID: <7cf0e30a7309008a81cc65e692511a1e8e6b544f.camel@perches.com>
Date:   Tue, 28 May 2019 16:40:06 -0700
From:   Joe Perches <joe@...ches.com>
To:     Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib: test_overflow: Avoid taining the kernel and fix
 wrap size

On Tue, 2019-05-28 at 15:51 -0700, Kees Cook wrote:
> This adds __GFP_NOWARN to the kmalloc()-portions of the overflow test to
> avoid tainting the kernel. Additionally fixes up the math on wrap size
> to be architecture and page size agnostic.
[]
> diff --git a/lib/test_overflow.c b/lib/test_overflow.c
[]
> @@ -486,16 +486,17 @@ static int __init test_overflow_shift(void)
[]
> +#define alloc_GFP		 (GFP_KERNEL | __GFP_NOWARN)
[]
> +#define alloc110(alloc, arg, sz) alloc(arg, sz, alloc_GFP | __GFP_NOWARN)

seems redundant.