openssl: Security fix CVE-2016-7055

There is a carry propagating bug in the Broadwell-specific Montgomery
multiplication procedure that handles input lengths divisible by, but
longer than 256 bits.

External References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7055
https://www.openssl.org/news/secadv/20161110.txt

Patch from:
https://github.com/openssl/openssl/commit/57c4b9f6a2f800b41ce2836986fe33640f6c3f8a

(From OE-Core rev: 07cfa9e2bceb07f3baf40681f8c57f4d3da0aee5)

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/openssl/openssl/CVE-2016-7055.patch b/meta/recipes-connectivity/openssl/openssl/CVE-2016-7055.patch
new file mode 100644
index 0000000000..83a74cdacb
--- /dev/null
+++ b/meta/recipes-connectivity/openssl/openssl/CVE-2016-7055.patch
@@ -0,0 +1,43 @@
+From 57c4b9f6a2f800b41ce2836986fe33640f6c3f8a Mon Sep 17 00:00:00 2001
+From: Andy Polyakov <appro@openssl.org>
+Date: Sun, 6 Nov 2016 18:33:17 +0100
+Subject: [PATCH] bn/asm/x86_64-mont.pl: fix for CVE-2016-7055 (Low severity).
+
+Reviewed-by: Rich Salz <rsalz@openssl.org>
+(cherry picked from commit 2fac86d9abeaa643677d1ffd0a139239fdf9406a)
+
+Upstream-Status: Backport [https://github.com/openssl/openssl/commit/57c4b9f6a2f800b41ce2836986fe33640f6c3f8a]
+CVE: CVE-2016-7055
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ crypto/bn/asm/x86_64-mont.pl | 5 ++---
+ 1 file changed, 2 insertions(+), 3 deletions(-)
+
+diff --git a/crypto/bn/asm/x86_64-mont.pl b/crypto/bn/asm/x86_64-mont.pl
+index 044fd7e..80492d8 100755
+--- a/crypto/bn/asm/x86_64-mont.pl
++++ b/crypto/bn/asm/x86_64-mont.pl
+@@ -1148,18 +1148,17 @@ $code.=<<___;
+        mulx    2*8($aptr),%r15,%r13    # ...
+        adox    -3*8($tptr),%r11
+        adcx    %r15,%r12
+-       adox    $zero,%r12
++       adox    -2*8($tptr),%r12
+        adcx    $zero,%r13
++       adox    $zero,%r13
+ 
+        mov     $bptr,8(%rsp)           # off-load &b[i]
+-       .byte   0x67
+        mov     $mi,%r15
+        imulq   24(%rsp),$mi            # "t[0]"*n0
+        xor     %ebp,%ebp               # xor   $zero,$zero     # cf=0, of=0
+ 
+        mulx    3*8($aptr),%rax,%r14
+         mov    $mi,%rdx
+-       adox    -2*8($tptr),%r12
+        adcx    %rax,%r13
+        adox    -1*8($tptr),%r13
+        adcx    $zero,%r14
+-- 
+2.7.4
+