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Message-Id: <1515636190-24061-10-git-send-email-keescook@chromium.org>
Date: Wed, 10 Jan 2018 18:02:41 -0800
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
David Windsor <dave@...lcore.net>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-mm@...ck.org,
linux-xfs@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Andy Lutomirski <luto@...nel.org>,
Christoph Hellwig <hch@...radead.org>,
Christoph Lameter <cl@...ux.com>,
"David S. Miller" <davem@...emloft.net>,
Laura Abbott <labbott@...hat.com>,
Mark Rutland <mark.rutland@....com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
Christoffer Dall <christoffer.dall@...aro.org>,
Dave Kleikamp <dave.kleikamp@...cle.com>,
Jan Kara <jack@...e.cz>,
Luis de Bethencourt <luisbg@...nel.org>,
Marc Zyngier <marc.zyngier@....com>,
Rik van Riel <riel@...hat.com>,
Matthew Garrett <mjg59@...gle.com>,
linux-fsdevel@...r.kernel.org,
linux-arch@...r.kernel.org,
netdev@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH 09/38] usercopy: Mark kmalloc caches as usercopy caches
From: David Windsor <dave@...lcore.net>
Mark the kmalloc slab caches as entirely whitelisted. These caches
are frequently used to fulfill kernel allocations that contain data
to be copied to/from userspace. Internal-only uses are also common,
but are scattered in the kernel. For now, mark all the kmalloc caches
as whitelisted.
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: David Windsor <dave@...lcore.net>
[kees: merged in moved kmalloc hunks, adjust commit log]
Cc: Pekka Enberg <penberg@...nel.org>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-xfs@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
Acked-by: Christoph Lameter <cl@...ux.com>
---
mm/slab.c | 3 ++-
mm/slab.h | 3 ++-
mm/slab_common.c | 10 ++++++----
3 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index b9b0df620bb9..dd367fe17a4e 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1291,7 +1291,8 @@ void __init kmem_cache_init(void)
*/
kmalloc_caches[INDEX_NODE] = create_kmalloc_cache(
kmalloc_info[INDEX_NODE].name,
- kmalloc_size(INDEX_NODE), ARCH_KMALLOC_FLAGS);
+ kmalloc_size(INDEX_NODE), ARCH_KMALLOC_FLAGS,
+ 0, kmalloc_size(INDEX_NODE));
slab_state = PARTIAL_NODE;
setup_kmalloc_cache_index_table();
diff --git a/mm/slab.h b/mm/slab.h
index b476c435680f..98c5bcc45d8b 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -97,7 +97,8 @@ struct kmem_cache *kmalloc_slab(size_t, gfp_t);
int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
- slab_flags_t flags);
+ slab_flags_t flags, size_t useroffset,
+ size_t usersize);
extern void create_boot_cache(struct kmem_cache *, const char *name,
size_t size, slab_flags_t flags, size_t useroffset,
size_t usersize);
diff --git a/mm/slab_common.c b/mm/slab_common.c
index a51f65408637..8ac2a6320a6c 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -937,14 +937,15 @@ void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t siz
}
struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size,
- slab_flags_t flags)
+ slab_flags_t flags, size_t useroffset,
+ size_t usersize)
{
struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
if (!s)
panic("Out of memory when creating slab %s\n", name);
- create_boot_cache(s, name, size, flags, 0, size);
+ create_boot_cache(s, name, size, flags, useroffset, usersize);
list_add(&s->list, &slab_caches);
memcg_link_cache(s);
s->refcount = 1;
@@ -1098,7 +1099,8 @@ void __init setup_kmalloc_cache_index_table(void)
static void __init new_kmalloc_cache(int idx, slab_flags_t flags)
{
kmalloc_caches[idx] = create_kmalloc_cache(kmalloc_info[idx].name,
- kmalloc_info[idx].size, flags);
+ kmalloc_info[idx].size, flags, 0,
+ kmalloc_info[idx].size);
}
/*
@@ -1139,7 +1141,7 @@ void __init create_kmalloc_caches(slab_flags_t flags)
BUG_ON(!n);
kmalloc_dma_caches[i] = create_kmalloc_cache(n,
- size, SLAB_CACHE_DMA | flags);
+ size, SLAB_CACHE_DMA | flags, 0, 0);
}
}
#endif
--
2.7.4
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