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| author | Eric Biggers <ebiggers@google.com> | 2018-07-28 01:36:10 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-08-03 13:06:06 +0300 |
| commit | 35f7d5225ffcbf1b759f641aec1735e3a89b1914 (patch) | |
| tree | 8e433b5ee404d6f4ed9a4319f0358ef6b5fb7f42 | |
| parent | afb31cd2d1a1bc3ca055fb2519ec4e9ab969ffe0 (diff) | |
| download | linux-35f7d5225ffcbf1b759f641aec1735e3a89b1914.tar.xz | |
crypto: dh - fix calculating encoded key size
It was forgotten to increase DH_KPP_SECRET_MIN_SIZE to include 'q_size',
causing an out-of-bounds write of 4 bytes in crypto_dh_encode_key(), and
an out-of-bounds read of 4 bytes in crypto_dh_decode_key(). Fix it, and
fix the lengths of the test vectors to match this.
Reported-by: syzbot+6d38d558c25b53b8f4ed@syzkaller.appspotmail.com
Fixes: e3fe0ae12962 ("crypto: dh - add public key verification test")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | crypto/dh_helper.c | 2 | ||||
| -rw-r--r-- | crypto/testmgr.h | 12 |
2 files changed, 7 insertions, 7 deletions
diff --git a/crypto/dh_helper.c b/crypto/dh_helper.c index a7de3d9ce5ac..db9b2d9c58f0 100644 --- a/crypto/dh_helper.c +++ b/crypto/dh_helper.c @@ -14,7 +14,7 @@ #include <crypto/dh.h> #include <crypto/kpp.h> -#define DH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 3 * sizeof(int)) +#define DH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 4 * sizeof(int)) static inline u8 *dh_pack_data(void *dst, const void *src, size_t size) { diff --git a/crypto/testmgr.h b/crypto/testmgr.h index 759462d65f41..173111c70746 100644 --- a/crypto/testmgr.h +++ b/crypto/testmgr.h @@ -641,14 +641,14 @@ static const struct kpp_testvec dh_tv_template[] = { .secret = #ifdef __LITTLE_ENDIAN "\x01\x00" /* type */ - "\x11\x02" /* len */ + "\x15\x02" /* len */ "\x00\x01\x00\x00" /* key_size */ "\x00\x01\x00\x00" /* p_size */ "\x00\x00\x00\x00" /* q_size */ "\x01\x00\x00\x00" /* g_size */ #else "\x00\x01" /* type */ - "\x02\x11" /* len */ + "\x02\x15" /* len */ "\x00\x00\x01\x00" /* key_size */ "\x00\x00\x01\x00" /* p_size */ "\x00\x00\x00\x00" /* q_size */ @@ -741,7 +741,7 @@ static const struct kpp_testvec dh_tv_template[] = { "\xd3\x34\x49\xad\x64\xa6\xb1\xc0\x59\x28\x75\x60\xa7\x8a\xb0\x11" "\x56\x89\x42\x74\x11\xf5\xf6\x5e\x6f\x16\x54\x6a\xb1\x76\x4d\x50" "\x8a\x68\xc1\x5b\x82\xb9\x0d\x00\x32\x50\xed\x88\x87\x48\x92\x17", - .secret_size = 529, + .secret_size = 533, .b_public_size = 256, .expected_a_public_size = 256, .expected_ss_size = 256, @@ -750,14 +750,14 @@ static const struct kpp_testvec dh_tv_template[] = { .secret = #ifdef __LITTLE_ENDIAN "\x01\x00" /* type */ - "\x11\x02" /* len */ + "\x15\x02" /* len */ "\x00\x01\x00\x00" /* key_size */ "\x00\x01\x00\x00" /* p_size */ "\x00\x00\x00\x00" /* q_size */ "\x01\x00\x00\x00" /* g_size */ #else "\x00\x01" /* type */ - "\x02\x11" /* len */ + "\x02\x15" /* len */ "\x00\x00\x01\x00" /* key_size */ "\x00\x00\x01\x00" /* p_size */ "\x00\x00\x00\x00" /* q_size */ @@ -850,7 +850,7 @@ static const struct kpp_testvec dh_tv_template[] = { "\x5e\x5a\x64\xbd\xf6\x85\x04\xe8\x28\x6a\xac\xef\xce\x19\x8e\x9a" "\xfe\x75\xc0\x27\x69\xe3\xb3\x7b\x21\xa7\xb1\x16\xa4\x85\x23\xee" "\xb0\x1b\x04\x6e\xbd\xab\x16\xde\xfd\x86\x6b\xa9\x95\xd7\x0b\xfd", - .secret_size = 529, + .secret_size = 533, .b_public_size = 256, .expected_a_public_size = 256, .expected_ss_size = 256, |