linux-kernel - Re: [PATCH v5] mm: SLAB freelist randomization

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Message-Id: <20160427121617.5a3123d75230effd7842e408@linux-foundation.org>
Date:	Wed, 27 Apr 2016 12:16:17 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Thomas Garnier <thgarnie@...gle.com>
Cc:	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Kees Cook <keescook@...omium.org>, gthelen@...gle.com,
	labbott@...oraproject.org, kernel-hardening@...ts.openwall.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v5] mm: SLAB freelist randomization

On Wed, 27 Apr 2016 10:20:59 -0700 Thomas Garnier <thgarnie@...gle.com> wrote:

> Provides an optional config (CONFIG_SLAB_FREELIST_RANDOM) to randomize
> the SLAB freelist.

Forgot this bit?

From: Andrew Morton <akpm@...ux-foundation.org>
Subject: mm-slab-freelist-randomization-v5-fix

propagate gfp_t into cache_random_seq_create()

Cc: Christoph Lameter <cl@...ux.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Greg Thelen <gthelen@...gle.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Laura Abbott <labbott@...oraproject.org>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: Thomas Garnier <thgarnie@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>

--- a/mm/slab.c~mm-slab-freelist-randomization-v5-fix
+++ a/mm/slab.c
@@ -1262,7 +1262,7 @@ static void freelist_randomize(struct rn
 }
 
 /* Create a random sequence per cache */
-static int cache_random_seq_create(struct kmem_cache *cachep)
+static int cache_random_seq_create(struct kmem_cache *cachep, gfp_t gfp)
 {
 	unsigned int seed, count = cachep->num;
 	struct rnd_state state;
@@ -1271,7 +1271,7 @@ static int cache_random_seq_create(struc
 		return 0;
 
 	/* If it fails, we will just use the global lists */
-	cachep->random_seq = kcalloc(count, sizeof(freelist_idx_t), GFP_KERNEL);
+	cachep->random_seq = kcalloc(count, sizeof(freelist_idx_t), gfp);
 	if (!cachep->random_seq)
 		return -ENOMEM;
 
@@ -1290,7 +1290,7 @@ static void cache_random_seq_destroy(str
 	cachep->random_seq = NULL;
 }
 #else
-static inline int cache_random_seq_create(struct kmem_cache *cachep)
+static inline int cache_random_seq_create(struct kmem_cache *cachep, gfp_t gfp)
 {
 	return 0;
 }
@@ -3999,7 +3999,7 @@ static int enable_cpucache(struct kmem_c
 	int shared = 0;
 	int batchcount = 0;
 
-	err = cache_random_seq_create(cachep);
+	err = cache_random_seq_create(cachep, gfp);
 	if (err)
 		goto end;
 
_