linux-kernel - Re: [PATCH] mm: kmemleak: Avoid using __va() on addresses that don't have a lowmem mapping

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160816173445.GD7609@e104818-lin.cambridge.arm.com>
Date:	Tue, 16 Aug 2016 18:34:46 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Vignesh R <vigneshr@...com>
Subject: Re: [PATCH] mm: kmemleak: Avoid using __va() on addresses that don't
 have a lowmem mapping

On Tue, Aug 16, 2016 at 04:20:56PM +0100, Catalin Marinas wrote:
> diff --git a/include/linux/kmemleak.h b/include/linux/kmemleak.h
> index 4894c6888bc6..380f72bc3657 100644
> --- a/include/linux/kmemleak.h
> +++ b/include/linux/kmemleak.h
> @@ -21,6 +21,7 @@
>  #ifndef __KMEMLEAK_H
>  #define __KMEMLEAK_H
>  
> +#include <linux/mm.h>

Given the kbuild-robot reports, this #include doesn't go well on some
architectures.

>  #include <linux/slab.h>
>  
>  #ifdef CONFIG_DEBUG_KMEMLEAK
> @@ -109,4 +110,29 @@ static inline void kmemleak_no_scan(const void *ptr)
>  
>  #endif	/* CONFIG_DEBUG_KMEMLEAK */
>  
> +static inline void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
> +				       int min_count, gfp_t gfp)
> +{
> +	if (!IS_ENABLED(CONFIG_HIGHMEM) || phys < __pa(high_memory))
> +		kmemleak_alloc(__va(phys), size, min_count, gfp);
> +}
> +
> +static inline void kmemleak_free_part_phys(phys_addr_t phys, size_t size)
> +{
> +	if (!IS_ENABLED(CONFIG_HIGHMEM) || phys < __pa(high_memory))
> +		kmemleak_free_part(__va(phys), size);
> +}
> +
> +static inline void kmemleak_not_leak_phys(phys_addr_t phys)
> +{
> +	if (!IS_ENABLED(CONFIG_HIGHMEM) || phys < __pa(high_memory))
> +		kmemleak_not_leak(__va(phys));
> +}
> +
> +static inline void kmemleak_ignore_phys(phys_addr_t phys)
> +{
> +	if (!IS_ENABLED(CONFIG_HIGHMEM) || phys < __pa(high_memory))
> +		kmemleak_ignore(__va(phys));
> +}

I'll move these functions out of line and re-post the patch.

-- 
Catalin