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| author | Salvatore Benedetto <salvatore.benedetto@intel.com> | 2017-04-25 16:59:47 +0100 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2017-04-30 12:22:05 +0200 |
| commit | 763d9a302ab18da0a0078c9788ed6566d0c974e3 (patch) | |
| tree | ccc0213c60b3d08a9292493b27f6ad4a5cb25c1a /net/bluetooth | |
| parent | 58771c1cb0023fdd744e76d6cad7716dc4f579ee (diff) | |
| download | linux-rpi-763d9a302ab18da0a0078c9788ed6566d0c974e3.tar.gz linux-rpi-763d9a302ab18da0a0078c9788ed6566d0c974e3.tar.bz2 linux-rpi-763d9a302ab18da0a0078c9788ed6566d0c974e3.zip | |
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>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/ecdh_helper.c | 22 | ||||
| -rw-r--r-- | net/bluetooth/selftest.c | 22 |
2 files changed, 33 insertions, 11 deletions
diff --git a/net/bluetooth/ecdh_helper.c b/net/bluetooth/ecdh_helper.c index b6d9aa155485..579684bfc322 100644 --- a/net/bluetooth/ecdh_helper.c +++ b/net/bluetooth/ecdh_helper.c @@ -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); } diff --git a/net/bluetooth/selftest.c b/net/bluetooth/selftest.c index efef2815646e..ee92c925ecc5 100644 --- a/net/bluetooth/selftest.c +++ b/net/bluetooth/selftest.c @@ -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]; |