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authorHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:09:35 +1100
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:09:35 +1100
commit490fe3f05be3f7c87d7932bcb6e6e53e3db2cd9c (patch)
tree9b919a9b05daf85d1bd410ce0a4ada482912cbd9 /drivers/crypto/padlock-aes.c
parentd4a7dd8e637b322faaa934ffcd6dd07711af831f (diff)
downloadlinux-linaro-stable-490fe3f05be3f7c87d7932bcb6e6e53e3db2cd9c.tar.gz
[CRYPTO] padlock: Fix alignment fault in aes_crypt_copy
The previous patch fixed spurious read faults from occuring by copying the data if we happen to have a single block at the end of a page. It appears that gcc cannot guarantee 16-byte alignment in the kernel with __attribute__. The following report from Torben Viets shows a buffer that's only 8-byte aligned: > eneral protection fault: 0000 [#1] > Modules linked in: xt_TCPMSS xt_tcpmss iptable_mangle ipt_MASQUERADE > xt_tcpudp xt_mark xt_state iptable_nat nf_nat nf_conntrack_ipv4 > iptable_filter ip_tables x_tables pppoe pppox af_packet ppp_generic slhc > aes_i586 > CPU: 0 > EIP: 0060:[<c035b828>] Not tainted VLI > EFLAGS: 00010292 (2.6.23.12 #7) > EIP is at aes_crypt_copy+0x28/0x40 > eax: f7639ff0 ebx: f6c24050 ecx: 00000001 edx: f6c24030 > esi: f7e89dc8 edi: f7639ff0 ebp: 00010000 esp: f7e89dc8 Since the hardware must have 16-byte alignment, the following patch fixes this by open coding the alignment adjustment. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/padlock-aes.c')
-rw-r--r--drivers/crypto/padlock-aes.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/crypto/padlock-aes.c b/drivers/crypto/padlock-aes.c
index a337b693b6c9..5f7e71810489 100644
--- a/drivers/crypto/padlock-aes.c
+++ b/drivers/crypto/padlock-aes.c
@@ -429,8 +429,8 @@ static inline void padlock_xcrypt(const u8 *input, u8 *output, void *key,
static void aes_crypt_copy(const u8 *in, u8 *out, u32 *key, struct cword *cword)
{
- u8 tmp[AES_BLOCK_SIZE * 2]
- __attribute__ ((__aligned__(PADLOCK_ALIGNMENT)));
+ u8 buf[AES_BLOCK_SIZE * 2 + PADLOCK_ALIGNMENT - 1];
+ u8 *tmp = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
memcpy(tmp, in, AES_BLOCK_SIZE);
padlock_xcrypt(tmp, out, key, cword);