Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d4a7dd8e637b322faaa934ffcd6dd07711af831f
Commit: d4a7dd8e637b322faaa934ffcd6dd07711af831f
Parent: 38cb2419f544ad413c7f7aa8c17fd7377610cdd8
Author: Herbert Xu <[EMAIL PROTECTED]>
AuthorDate: Fri Dec 28 11:05:46 2007 +1100
Committer: Herbert Xu <[EMAIL PROTECTED]>
CommitDate: Fri Dec 28 11:05:46 2007 +1100
[CRYPTO] padlock: Fix spurious ECB page fault
The xcryptecb instruction always processes an even number of blocks so
we need to ensure th existence of an extra block if we have to process
an odd number of blocks.
Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>
---
drivers/crypto/padlock-aes.c | 53 ++++++++++++++++++++++++++++++++++++++---
1 files changed, 49 insertions(+), 4 deletions(-)
diff --git a/drivers/crypto/padlock-aes.c b/drivers/crypto/padlock-aes.c
index abbcff0..a337b69 100644
--- a/drivers/crypto/padlock-aes.c
+++ b/drivers/crypto/padlock-aes.c
@@ -419,13 +419,58 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8
*in_key,
/* ====== Encryption/decryption routines ====== */
/* These are the real call to PadLock. */
+static inline void padlock_xcrypt(const u8 *input, u8 *output, void *key,
+ void *control_word)
+{
+ asm volatile (".byte 0xf3,0x0f,0xa7,0xc8" /* rep xcryptecb */
+ : "+S"(input), "+D"(output)
+ : "d"(control_word), "b"(key), "c"(1));
+}
+
+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)));
+
+ memcpy(tmp, in, AES_BLOCK_SIZE);
+ padlock_xcrypt(tmp, out, key, cword);
+}
+
+static inline void aes_crypt(const u8 *in, u8 *out, u32 *key,
+ struct cword *cword)
+{
+ asm volatile ("pushfl; popfl");
+
+ /* padlock_xcrypt requires at least two blocks of data. */
+ if (unlikely(!(((unsigned long)in ^ (PAGE_SIZE - AES_BLOCK_SIZE)) &
+ (PAGE_SIZE - 1)))) {
+ aes_crypt_copy(in, out, key, cword);
+ return;
+ }
+
+ padlock_xcrypt(in, out, key, cword);
+}
+
static inline void padlock_xcrypt_ecb(const u8 *input, u8 *output, void *key,
void *control_word, u32 count)
{
+ if (count == 1) {
+ aes_crypt(input, output, key, control_word);
+ return;
+ }
+
asm volatile ("pushfl; popfl"); /* enforce key reload. */
- asm volatile (".byte 0xf3,0x0f,0xa7,0xc8" /* rep xcryptecb */
+ asm volatile ("test $1, %%cl;"
+ "je 1f;"
+ "lea -1(%%ecx), %%eax;"
+ "mov $1, %%ecx;"
+ ".byte 0xf3,0x0f,0xa7,0xc8;" /* rep xcryptecb */
+ "mov %%eax, %%ecx;"
+ "1:"
+ ".byte 0xf3,0x0f,0xa7,0xc8" /* rep xcryptecb */
: "+S"(input), "+D"(output)
- : "d"(control_word), "b"(key), "c"(count));
+ : "d"(control_word), "b"(key), "c"(count)
+ : "ax");
}
static inline u8 *padlock_xcrypt_cbc(const u8 *input, u8 *output, void *key,
@@ -443,13 +488,13 @@ static inline u8 *padlock_xcrypt_cbc(const u8 *input, u8
*output, void *key,
static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct aes_ctx *ctx = aes_ctx(tfm);
- padlock_xcrypt_ecb(in, out, ctx->E, &ctx->cword.encrypt, 1);
+ aes_crypt(in, out, ctx->E, &ctx->cword.encrypt);
}
static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct aes_ctx *ctx = aes_ctx(tfm);
- padlock_xcrypt_ecb(in, out, ctx->D, &ctx->cword.decrypt, 1);
+ aes_crypt(in, out, ctx->D, &ctx->cword.decrypt);
}
static struct crypto_alg aes_alg = {
-
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