Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=490fe3f05be3f7c87d7932bcb6e6e53e3db2cd9c
Commit: 490fe3f05be3f7c87d7932bcb6e6e53e3db2cd9c
Parent: d4a7dd8e637b322faaa934ffcd6dd07711af831f
Author: Herbert Xu <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 11 08:09:35 2008 +1100
Committer: Herbert Xu <[EMAIL PROTECTED]>
CommitDate: Fri Jan 11 08:09:35 2008 +1100
[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 <[EMAIL PROTECTED]>
---
drivers/crypto/padlock-aes.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/crypto/padlock-aes.c b/drivers/crypto/padlock-aes.c
index a337b69..5f7e718 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);
-
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