linux-kernel - Re: [PATCH] slab: initialize unused alien cache entry as NULL at alloc_alien

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]

Date:	Tue, 22 Dec 2009 09:47:39 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Haicheng Li <haicheng.li@...ux.intel.com>
cc:	linux-mm@...ck.org, Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>, andi@...stfloor.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] slab: initialize unused alien cache entry as NULL at
 alloc_alien_cache().

On Tue, 22 Dec 2009, Haicheng Li wrote:

>  	struct array_cache **ac_ptr;
> -	int memsize = sizeof(void *) * nr_node_ids;
> +	int memsize = sizeof(void *) * MAX_NUMNODES;
>  	int i;

Why does the alien cache pointer array size have to be increased? node ids
beyond nr_node_ids cannot be used.


>
>  	if (limit > 1)
>  		limit = 12;
>  	ac_ptr = kmalloc_node(memsize, gfp, node);

Use kzalloc to ensure zeroed memory.

>  	if (ac_ptr) {
> +		memset(ac_ptr, 0, memsize);
>  		for_each_node(i) {
> -			if (i == node || !node_online(i)) {
> -				ac_ptr[i] = NULL;
> +			if (i == node || !node_online(i))
>  				continue;
> -			}
>  			ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d,
> gfp);
>  			if (!ac_ptr[i]) {
>  				for (i--; i >= 0; i--)
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/