diff options
author | Ross Burton <ross.burton@intel.com> | 2017-07-19 14:27:32 +0100 |
---|---|---|
committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2017-07-19 15:13:47 +0100 |
commit | 3ca9f90dffad3907ceec605a851ae949dd3b6bd6 (patch) | |
tree | cd2f0c663dcaf3195d4c72d34bc6d089dce13136 /meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch | |
parent | ccc964cf9fde0d71d289c22c2a231f0021461012 (diff) | |
download | poky-3ca9f90dffad3907ceec605a851ae949dd3b6bd6.tar.gz |
libgcrypt: fix CVE-2017-9526
In libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from
side-channel observation during the signing process) can easily recover the
long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this
session key in secure memory, to ensure that constant-time point operations are
used in the MPI library.
(From OE-Core rev: fb28c54347fcf4957b9b8ee7dee423d859eb7820)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch')
-rw-r--r-- | meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch b/meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch new file mode 100644 index 0000000000..f6c4ca76f3 --- /dev/null +++ b/meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch | |||
@@ -0,0 +1,39 @@ | |||
1 | CVE: CVE-2017-9526 | ||
2 | Upstream-Status: Backport | ||
3 | Signed-off-by: Ross Burton <ross.burton@intel.com> | ||
4 | |||
5 | From b3cab278eb9c2ceda79f980bc26460d97f260041 Mon Sep 17 00:00:00 2001 | ||
6 | From: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be> | ||
7 | Date: Thu, 19 Jan 2017 17:00:15 +0100 | ||
8 | Subject: [PATCH] ecc: Store EdDSA session key in secure memory. | ||
9 | |||
10 | * cipher/ecc-eddsa.c (_gcry_ecc_eddsa_sign): use mpi_snew to allocate | ||
11 | session key. | ||
12 | -- | ||
13 | |||
14 | An attacker who learns the EdDSA session key from side-channel | ||
15 | observation during the signing process, can easily revover the long- | ||
16 | term secret key. Storing the session key in secure memory ensures that | ||
17 | constant time point operations are used in the MPI library. | ||
18 | |||
19 | Signed-off-by: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be> | ||
20 | --- | ||
21 | cipher/ecc-eddsa.c | 2 +- | ||
22 | 1 file changed, 1 insertion(+), 1 deletion(-) | ||
23 | |||
24 | diff --git a/cipher/ecc-eddsa.c b/cipher/ecc-eddsa.c | ||
25 | index f91f8489..813e030d 100644 | ||
26 | --- a/cipher/ecc-eddsa.c | ||
27 | +++ b/cipher/ecc-eddsa.c | ||
28 | @@ -603,7 +603,7 @@ _gcry_ecc_eddsa_sign (gcry_mpi_t input, ECC_secret_key *skey, | ||
29 | a = mpi_snew (0); | ||
30 | x = mpi_new (0); | ||
31 | y = mpi_new (0); | ||
32 | - r = mpi_new (0); | ||
33 | + r = mpi_snew (0); | ||
34 | ctx = _gcry_mpi_ec_p_internal_new (skey->E.model, skey->E.dialect, 0, | ||
35 | skey->E.p, skey->E.a, skey->E.b); | ||
36 | b = (ctx->nbits+7)/8; | ||
37 | -- | ||
38 | 2.11.0 | ||
39 | |||