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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  [CRYPTO] padlock: Fix spurious ECB page fault
This commit is contained in:
Linus Torvalds 2007-12-27 21:45:01 -08:00
parent ad7edfe049 d4a7dd8e63
commit 29a09a7b13
1 changed files with 49 additions and 4 deletions
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53
drivers/crypto/padlock-aes.c
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@ -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 = {