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Revision 070e76cb3ffe43f6855492e77c96680c562598f0 authored by Leonid Yegoshin on 27 November 2014, 11:13:08 UTC, committed by Ralf Baechle on 27 November 2014, 16:21:56 UTC 
MIPS: tlbex: Fix potential HTW race on TLBL/M/S handlers
 
There is a potential race when probing the TLB in TLBL/M/S exception
handlers for a matching entry. Between the time we hit a TLBL/S/M
exception and the time we get to execute the TLBP instruction, the
HTW may have replaced the TLB entry we are interested in hence the TLB
probe may fail. However, in the existing handlers, we never checked the
status of the TLBP (ie check the result in the C0/Index register). We
fix this by adding such a check when the core implements the HTW. If
we couldn't find a matching entry, we return back and try again.

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: <stable@vger.kernel.org> # v3.17+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8599/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent b4da18b
Raw File
cryptd.h 
/*
 * Software async crypto daemon
 *
 * Added AEAD support to cryptd.
 *    Authors: Tadeusz Struk (tadeusz.struk@intel.com)
 *             Adrian Hoban <adrian.hoban@intel.com>
 *             Gabriele Paoloni <gabriele.paoloni@intel.com>
 *             Aidan O'Mahony (aidan.o.mahony@intel.com)
 *    Copyright (c) 2010, Intel Corporation.
 */

#ifndef _CRYPTO_CRYPT_H
#define _CRYPTO_CRYPT_H

#include <linux/crypto.h>
#include <linux/kernel.h>
#include <crypto/hash.h>

struct cryptd_ablkcipher {
	struct crypto_ablkcipher base;
};

static inline struct cryptd_ablkcipher *__cryptd_ablkcipher_cast(
	struct crypto_ablkcipher *tfm)
{
	return (struct cryptd_ablkcipher *)tfm;
}

/* alg_name should be algorithm to be cryptd-ed */
struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
						  u32 type, u32 mask);
struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm);
void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm);

struct cryptd_ahash {
	struct crypto_ahash base;
};

static inline struct cryptd_ahash *__cryptd_ahash_cast(
	struct crypto_ahash *tfm)
{
	return (struct cryptd_ahash *)tfm;
}

/* alg_name should be algorithm to be cryptd-ed */
struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
					u32 type, u32 mask);
struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm);
struct shash_desc *cryptd_shash_desc(struct ahash_request *req);
void cryptd_free_ahash(struct cryptd_ahash *tfm);

struct cryptd_aead {
	struct crypto_aead base;
};

static inline struct cryptd_aead *__cryptd_aead_cast(
	struct crypto_aead *tfm)
{
	return (struct cryptd_aead *)tfm;
}

struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
					  u32 type, u32 mask);

struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm);

void cryptd_free_aead(struct cryptd_aead *tfm);

#endif
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