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Commit 4293242d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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

Pull crypto fixes from Herbert Xu:
 "This fixes a number of concurrency issues on s390 where multiple users
  of the same crypto transform may clobber each other's results"

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: s390 - fix des and des3_ede ctr concurrency issue
  crypto: s390 - fix des and des3_ede cbc concurrency issue
  crypto: s390 - fix concurrency issue in aes-ctr mode
parents f8f20234 ee97dc7d

arch/s390/crypto/aes_s390.c

+46 −19
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/err.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/spinlock.h>

#include "crypt_s390.h"



#define AES_KEYLEN_128		1
@@ -32,6 +33,7 @@ 
#define AES_KEYLEN_256		4



static u8 *ctrblk;

static DEFINE_SPINLOCK(ctrblk_lock);

static char keylen_flag;



struct s390_aes_ctx {
@@ -758,43 +760,67 @@ static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, 
	return aes_set_key(tfm, in_key, key_len);

}



static unsigned int __ctrblk_init(u8 *ctrptr, unsigned int nbytes)

{

	unsigned int i, n;



	/* only use complete blocks, max. PAGE_SIZE */

	n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);

	for (i = AES_BLOCK_SIZE; i < n; i += AES_BLOCK_SIZE) {

		memcpy(ctrptr + i, ctrptr + i - AES_BLOCK_SIZE,

		       AES_BLOCK_SIZE);

		crypto_inc(ctrptr + i, AES_BLOCK_SIZE);

	}

	return n;

}



static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,

			 struct s390_aes_ctx *sctx, struct blkcipher_walk *walk)

{

	int ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);

	unsigned int i, n, nbytes;

	u8 buf[AES_BLOCK_SIZE];

	u8 *out, *in;

	unsigned int n, nbytes;

	u8 buf[AES_BLOCK_SIZE], ctrbuf[AES_BLOCK_SIZE];

	u8 *out, *in, *ctrptr = ctrbuf;



	if (!walk->nbytes)

		return ret;



	memcpy(ctrblk, walk->iv, AES_BLOCK_SIZE);

	if (spin_trylock(&ctrblk_lock))

		ctrptr = ctrblk;



	memcpy(ctrptr, walk->iv, AES_BLOCK_SIZE);

	while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {

		out = walk->dst.virt.addr;

		in = walk->src.virt.addr;

		while (nbytes >= AES_BLOCK_SIZE) {

			/* only use complete blocks, max. PAGE_SIZE */

			n = (nbytes > PAGE_SIZE) ? PAGE_SIZE :

						 nbytes & ~(AES_BLOCK_SIZE - 1);

			for (i = AES_BLOCK_SIZE; i < n; i += AES_BLOCK_SIZE) {

				memcpy(ctrblk + i, ctrblk + i - AES_BLOCK_SIZE,

				       AES_BLOCK_SIZE);

				crypto_inc(ctrblk + i, AES_BLOCK_SIZE);

			}

			ret = crypt_s390_kmctr(func, sctx->key, out, in, n, ctrblk);

			if (ret < 0 || ret != n)

			if (ctrptr == ctrblk)

				n = __ctrblk_init(ctrptr, nbytes);

			else

				n = AES_BLOCK_SIZE;

			ret = crypt_s390_kmctr(func, sctx->key, out, in,

					       n, ctrptr);

			if (ret < 0 || ret != n) {

				if (ctrptr == ctrblk)

					spin_unlock(&ctrblk_lock);

				return -EIO;

			}

			if (n > AES_BLOCK_SIZE)

				memcpy(ctrblk, ctrblk + n - AES_BLOCK_SIZE,

				memcpy(ctrptr, ctrptr + n - AES_BLOCK_SIZE,

				       AES_BLOCK_SIZE);

			crypto_inc(ctrblk, AES_BLOCK_SIZE);

			crypto_inc(ctrptr, AES_BLOCK_SIZE);

			out += n;

			in += n;

			nbytes -= n;

		}

		ret = blkcipher_walk_done(desc, walk, nbytes);

	}

	if (ctrptr == ctrblk) {

		if (nbytes)

			memcpy(ctrbuf, ctrptr, AES_BLOCK_SIZE);

		else

			memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);

		spin_unlock(&ctrblk_lock);

	}

	/*

	 * final block may be < AES_BLOCK_SIZE, copy only nbytes

	 */
@@ -802,14 +828,15 @@ static int ctr_aes_crypt(struct blkcipher_desc *desc, long func, 
		out = walk->dst.virt.addr;

		in = walk->src.virt.addr;

		ret = crypt_s390_kmctr(func, sctx->key, buf, in,

				       AES_BLOCK_SIZE, ctrblk);

				       AES_BLOCK_SIZE, ctrbuf);

		if (ret < 0 || ret != AES_BLOCK_SIZE)

			return -EIO;

		memcpy(out, buf, nbytes);

		crypto_inc(ctrblk, AES_BLOCK_SIZE);

		crypto_inc(ctrbuf, AES_BLOCK_SIZE);

		ret = blkcipher_walk_done(desc, walk, 0);

		memcpy(walk->iv, ctrbuf, AES_BLOCK_SIZE);

	}

	memcpy(walk->iv, ctrblk, AES_BLOCK_SIZE);



	return ret;

}

arch/s390/crypto/des_s390.c

+62 −33
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#define DES3_KEY_SIZE	(3 * DES_KEY_SIZE)



static u8 *ctrblk;

static DEFINE_SPINLOCK(ctrblk_lock);



struct s390_des_ctx {

	u8 iv[DES_BLOCK_SIZE];
@@ -105,29 +106,35 @@ static int ecb_desall_crypt(struct blkcipher_desc *desc, long func, 
}



static int cbc_desall_crypt(struct blkcipher_desc *desc, long func,

			    u8 *iv, struct blkcipher_walk *walk)

			    struct blkcipher_walk *walk)

{

	struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);

	int ret = blkcipher_walk_virt(desc, walk);

	unsigned int nbytes = walk->nbytes;

	struct {

		u8 iv[DES_BLOCK_SIZE];

		u8 key[DES3_KEY_SIZE];

	} param;



	if (!nbytes)

		goto out;



	memcpy(iv, walk->iv, DES_BLOCK_SIZE);

	memcpy(param.iv, walk->iv, DES_BLOCK_SIZE);

	memcpy(param.key, ctx->key, DES3_KEY_SIZE);

	do {

		/* only use complete blocks */

		unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);

		u8 *out = walk->dst.virt.addr;

		u8 *in = walk->src.virt.addr;



		ret = crypt_s390_kmc(func, iv, out, in, n);

		ret = crypt_s390_kmc(func, &param, out, in, n);

		if (ret < 0 || ret != n)

			return -EIO;



		nbytes &= DES_BLOCK_SIZE - 1;

		ret = blkcipher_walk_done(desc, walk, nbytes);

	} while ((nbytes = walk->nbytes));

	memcpy(walk->iv, iv, DES_BLOCK_SIZE);

	memcpy(walk->iv, param.iv, DES_BLOCK_SIZE);



out:

	return ret;
@@ -179,22 +186,20 @@ static int cbc_des_encrypt(struct blkcipher_desc *desc, 
			   struct scatterlist *dst, struct scatterlist *src,

			   unsigned int nbytes)

{

	struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);

	struct blkcipher_walk walk;



	blkcipher_walk_init(&walk, dst, src, nbytes);

	return cbc_desall_crypt(desc, KMC_DEA_ENCRYPT, ctx->iv, &walk);

	return cbc_desall_crypt(desc, KMC_DEA_ENCRYPT, &walk);

}



static int cbc_des_decrypt(struct blkcipher_desc *desc,

			   struct scatterlist *dst, struct scatterlist *src,

			   unsigned int nbytes)

{

	struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);

	struct blkcipher_walk walk;



	blkcipher_walk_init(&walk, dst, src, nbytes);

	return cbc_desall_crypt(desc, KMC_DEA_DECRYPT, ctx->iv, &walk);

	return cbc_desall_crypt(desc, KMC_DEA_DECRYPT, &walk);

}



static struct crypto_alg cbc_des_alg = {
@@ -327,22 +332,20 @@ static int cbc_des3_encrypt(struct blkcipher_desc *desc, 
			    struct scatterlist *dst, struct scatterlist *src,

			    unsigned int nbytes)

{

	struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);

	struct blkcipher_walk walk;



	blkcipher_walk_init(&walk, dst, src, nbytes);

	return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, ctx->iv, &walk);

	return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, &walk);

}



static int cbc_des3_decrypt(struct blkcipher_desc *desc,

			    struct scatterlist *dst, struct scatterlist *src,

			    unsigned int nbytes)

{

	struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);

	struct blkcipher_walk walk;



	blkcipher_walk_init(&walk, dst, src, nbytes);

	return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, ctx->iv, &walk);

	return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, &walk);

}



static struct crypto_alg cbc_des3_alg = {
@@ -366,54 +369,80 @@ static struct crypto_alg cbc_des3_alg = { 
	}

};



static unsigned int __ctrblk_init(u8 *ctrptr, unsigned int nbytes)

{

	unsigned int i, n;



	/* align to block size, max. PAGE_SIZE */

	n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(DES_BLOCK_SIZE - 1);

	for (i = DES_BLOCK_SIZE; i < n; i += DES_BLOCK_SIZE) {

		memcpy(ctrptr + i, ctrptr + i - DES_BLOCK_SIZE, DES_BLOCK_SIZE);

		crypto_inc(ctrptr + i, DES_BLOCK_SIZE);

	}

	return n;

}



static int ctr_desall_crypt(struct blkcipher_desc *desc, long func,

			    struct s390_des_ctx *ctx, struct blkcipher_walk *walk)

			    struct s390_des_ctx *ctx,

			    struct blkcipher_walk *walk)

{

	int ret = blkcipher_walk_virt_block(desc, walk, DES_BLOCK_SIZE);

	unsigned int i, n, nbytes;

	u8 buf[DES_BLOCK_SIZE];

	u8 *out, *in;

	unsigned int n, nbytes;

	u8 buf[DES_BLOCK_SIZE], ctrbuf[DES_BLOCK_SIZE];

	u8 *out, *in, *ctrptr = ctrbuf;



	if (!walk->nbytes)

		return ret;



	memcpy(ctrblk, walk->iv, DES_BLOCK_SIZE);

	if (spin_trylock(&ctrblk_lock))

		ctrptr = ctrblk;



	memcpy(ctrptr, walk->iv, DES_BLOCK_SIZE);

	while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {

		out = walk->dst.virt.addr;

		in = walk->src.virt.addr;

		while (nbytes >= DES_BLOCK_SIZE) {

			/* align to block size, max. PAGE_SIZE */

			n = (nbytes > PAGE_SIZE) ? PAGE_SIZE :

				nbytes & ~(DES_BLOCK_SIZE - 1);

			for (i = DES_BLOCK_SIZE; i < n; i += DES_BLOCK_SIZE) {

				memcpy(ctrblk + i, ctrblk + i - DES_BLOCK_SIZE,

				       DES_BLOCK_SIZE);

				crypto_inc(ctrblk + i, DES_BLOCK_SIZE);

			}

			ret = crypt_s390_kmctr(func, ctx->key, out, in, n, ctrblk);

			if (ret < 0 || ret != n)

			if (ctrptr == ctrblk)

				n = __ctrblk_init(ctrptr, nbytes);

			else

				n = DES_BLOCK_SIZE;

			ret = crypt_s390_kmctr(func, ctx->key, out, in,

					       n, ctrptr);

			if (ret < 0 || ret != n) {

				if (ctrptr == ctrblk)

					spin_unlock(&ctrblk_lock);

				return -EIO;

			}

			if (n > DES_BLOCK_SIZE)

				memcpy(ctrblk, ctrblk + n - DES_BLOCK_SIZE,

				memcpy(ctrptr, ctrptr + n - DES_BLOCK_SIZE,

				       DES_BLOCK_SIZE);

			crypto_inc(ctrblk, DES_BLOCK_SIZE);

			crypto_inc(ctrptr, DES_BLOCK_SIZE);

			out += n;

			in += n;

			nbytes -= n;

		}

		ret = blkcipher_walk_done(desc, walk, nbytes);

	}



	if (ctrptr == ctrblk) {

		if (nbytes)

			memcpy(ctrbuf, ctrptr, DES_BLOCK_SIZE);

		else

			memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);

		spin_unlock(&ctrblk_lock);

	}

	/* final block may be < DES_BLOCK_SIZE, copy only nbytes */

	if (nbytes) {

		out = walk->dst.virt.addr;

		in = walk->src.virt.addr;

		ret = crypt_s390_kmctr(func, ctx->key, buf, in,

				       DES_BLOCK_SIZE, ctrblk);

				       DES_BLOCK_SIZE, ctrbuf);

		if (ret < 0 || ret != DES_BLOCK_SIZE)

			return -EIO;

		memcpy(out, buf, nbytes);

		crypto_inc(ctrblk, DES_BLOCK_SIZE);

		crypto_inc(ctrbuf, DES_BLOCK_SIZE);

		ret = blkcipher_walk_done(desc, walk, 0);

		memcpy(walk->iv, ctrbuf, DES_BLOCK_SIZE);

	}

	memcpy(walk->iv, ctrblk, DES_BLOCK_SIZE);

	return ret;

}