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Bluetooth: allocate data for kpp on heap 

Bluetooth would crash when computing ECDH keys with kpp
if VMAP_STACK is enabled. Fix by allocating data passed
to kpp on heap.

Fixes: 58771c1c ("Bluetooth: convert smp and selftest to crypto kpp
API")
Signed-off-by: Salvatore Benedetto <salvatore.benedetto@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Salvatore Benedetto 2017-04-25 16:59:47 +01:00 committed by Marcel Holtmann
parent 58771c1cb0
commit 763d9a302a
2 changed files with 33 additions and 11 deletions
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22
net/bluetooth/ecdh_helper.c
View File

@ -59,16 +59,19 @@ bool compute_ecdh_secret(const u8 public_key[64], const u8 private_key[32],
struct ecdh p;
struct ecdh_completion result;
struct scatterlist src, dst;
u8 tmp[64];
u8 *buf;
u8 *tmp, *buf;
unsigned int buf_len;
int err = -ENOMEM;
tmp = kmalloc(64, GFP_KERNEL);
if (!tmp)
return false;
tfm = crypto_alloc_kpp("ecdh", CRYPTO_ALG_INTERNAL, 0);
if (IS_ERR(tfm)) {
pr_err("alg: kpp: Failed to load tfm for kpp: %ld\n",
PTR_ERR(tfm));
return false;
goto free_tmp;
}
req = kpp_request_alloc(tfm, GFP_KERNEL);
@ -128,6 +131,8 @@ free_req:
kpp_request_free(req);
free_kpp:
crypto_free_kpp(tfm);
free_tmp:
kfree(tmp);
return (err == 0);
}
@ -138,18 +143,21 @@ bool generate_ecdh_keys(u8 public_key[64], u8 private_key[32])
struct ecdh p;
struct ecdh_completion result;
struct scatterlist dst;
u8 tmp[64];
u8 *buf;
u8 *tmp, *buf;
unsigned int buf_len;
int err = -ENOMEM;
const unsigned short max_tries = 16;
unsigned short tries = 0;
tmp = kmalloc(64, GFP_KERNEL);
if (!tmp)
return false;
tfm = crypto_alloc_kpp("ecdh", CRYPTO_ALG_INTERNAL, 0);
if (IS_ERR(tfm)) {
pr_err("alg: kpp: Failed to load tfm for kpp: %ld\n",
PTR_ERR(tfm));
return false;
goto free_tmp;
}
req = kpp_request_alloc(tfm, GFP_KERNEL);
@ -219,5 +227,7 @@ free_req:
kpp_request_free(req);
free_kpp:
crypto_free_kpp(tfm);
free_tmp:
kfree(tmp);
return (err == 0);
}

22
net/bluetooth/selftest.c
View File

@ -142,18 +142,30 @@ static int __init test_ecdh_sample(const u8 priv_a[32], const u8 priv_b[32],
const u8 pub_a[64], const u8 pub_b[64],
const u8 dhkey[32])
{
u8 dhkey_a[32], dhkey_b[32];
u8 *tmp, *dhkey_a, *dhkey_b;
int ret = 0;
tmp = kmalloc(64, GFP_KERNEL);
if (!tmp)
return -EINVAL;
dhkey_a = &tmp[0];
dhkey_b = &tmp[32];
compute_ecdh_secret(pub_b, priv_a, dhkey_a);
compute_ecdh_secret(pub_a, priv_b, dhkey_b);
if (memcmp(dhkey_a, dhkey, 32))
return -EINVAL;
if (memcmp(dhkey_a, dhkey, 32)) {
ret = -EINVAL;
goto out;
}
if (memcmp(dhkey_b, dhkey, 32))
return -EINVAL;
ret = -EINVAL;
return 0;
out:
kfree(dhkey_a);
return ret;
}
static char test_ecdh_buffer[32];