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Message-Id: <1497915397-93805-22-git-send-email-keescook@chromium.org>
Date: Mon, 19 Jun 2017 16:36:35 -0700
From: Kees Cook <keescook@...omium.org>
To: kernel-hardening@...ts.openwall.com
Cc: Kees Cook <keescook@...omium.org>,
David Windsor <dave@...lcore.net>,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 21/23] usercopy: Restrict non-usercopy caches to size 0
With all known usercopied cache whitelists now defined in the kernel, switch
the default usercopy region of kmem_cache_create() to size 0. Any new caches
with usercopy regions will now need to use kmem_cache_create_usercopy()
instead of kmem_cache_create().
This patch is modified from Brad Spengler/PaX Team's PAX_USERCOPY
whitelisting code in the last public patch of grsecurity/PaX based on my
understanding of the code. Changes or omissions from the original code are
mine and don't reflect the original grsecurity/PaX code.
Signed-off-by: Kees Cook <keescook@...omium.org>
Cc: David Windsor <dave@...lcore.net>
---
mm/slab_common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 685321a0d355..2365dd21623d 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -512,7 +512,7 @@ struct kmem_cache *
kmem_cache_create(const char *name, size_t size, size_t align,
unsigned long flags, void (*ctor)(void *))
{
- return kmem_cache_create_usercopy(name, size, align, flags, 0, size,
+ return kmem_cache_create_usercopy(name, size, align, flags, 0, 0,
ctor);
}
EXPORT_SYMBOL(kmem_cache_create);
--
2.7.4
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