mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-14 15:54:15 +08:00
1d14389723
[ Upstream commita53ab94eb6] The length ('len' parameter) passed to crypto_ecdh_decode_key() is never checked against the length encoded in the passed buffer ('buf' parameter). This could lead to an out-of-bounds access when the passed length is less than the encoded length. Add a check to prevent that. Fixes:3c4b23901a("crypto: ecdh - Add ECDH software support") Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Sasha Levin <sashal@kernel.org>
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
|
|
* Copyright (c) 2016, Intel Corporation
|
|
* Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/err.h>
|
|
#include <linux/string.h>
|
|
#include <crypto/ecdh.h>
|
|
#include <crypto/kpp.h>
|
|
|
|
#define ECDH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 2 * sizeof(short))
|
|
|
|
static inline u8 *ecdh_pack_data(void *dst, const void *src, size_t sz)
|
|
{
|
|
memcpy(dst, src, sz);
|
|
return dst + sz;
|
|
}
|
|
|
|
static inline const u8 *ecdh_unpack_data(void *dst, const void *src, size_t sz)
|
|
{
|
|
memcpy(dst, src, sz);
|
|
return src + sz;
|
|
}
|
|
|
|
unsigned int crypto_ecdh_key_len(const struct ecdh *params)
|
|
{
|
|
return ECDH_KPP_SECRET_MIN_SIZE + params->key_size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_ecdh_key_len);
|
|
|
|
int crypto_ecdh_encode_key(char *buf, unsigned int len,
|
|
const struct ecdh *params)
|
|
{
|
|
u8 *ptr = buf;
|
|
struct kpp_secret secret = {
|
|
.type = CRYPTO_KPP_SECRET_TYPE_ECDH,
|
|
.len = len
|
|
};
|
|
|
|
if (unlikely(!buf))
|
|
return -EINVAL;
|
|
|
|
if (len != crypto_ecdh_key_len(params))
|
|
return -EINVAL;
|
|
|
|
ptr = ecdh_pack_data(ptr, &secret, sizeof(secret));
|
|
ptr = ecdh_pack_data(ptr, ¶ms->curve_id, sizeof(params->curve_id));
|
|
ptr = ecdh_pack_data(ptr, ¶ms->key_size, sizeof(params->key_size));
|
|
ecdh_pack_data(ptr, params->key, params->key_size);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_ecdh_encode_key);
|
|
|
|
int crypto_ecdh_decode_key(const char *buf, unsigned int len,
|
|
struct ecdh *params)
|
|
{
|
|
const u8 *ptr = buf;
|
|
struct kpp_secret secret;
|
|
|
|
if (unlikely(!buf || len < ECDH_KPP_SECRET_MIN_SIZE))
|
|
return -EINVAL;
|
|
|
|
ptr = ecdh_unpack_data(&secret, ptr, sizeof(secret));
|
|
if (secret.type != CRYPTO_KPP_SECRET_TYPE_ECDH)
|
|
return -EINVAL;
|
|
|
|
if (unlikely(len < secret.len))
|
|
return -EINVAL;
|
|
|
|
ptr = ecdh_unpack_data(¶ms->curve_id, ptr, sizeof(params->curve_id));
|
|
ptr = ecdh_unpack_data(¶ms->key_size, ptr, sizeof(params->key_size));
|
|
if (secret.len != crypto_ecdh_key_len(params))
|
|
return -EINVAL;
|
|
|
|
/* Don't allocate memory. Set pointer to data
|
|
* within the given buffer
|
|
*/
|
|
params->key = (void *)ptr;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_ecdh_decode_key);
|