File openssl-CVE-2017-3732.patch of Package openssl.17568

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File openssl-CVE-2017-3732.patch of Package openssl.17568

commit 760d04342a495ee86bf5adc71a91d126af64397f
Author: Andy Polyakov <appro@openssl.org>
Date:   Sat Jan 21 21:30:49 2017 +0100

bn/asm/x86_64-mont5.pl: fix carry bug in bn_sqr8x_internal.
    
    CVE-2017-3732
    
    Reviewed-by: Rich Salz <rsalz@openssl.org>

diff --git a/crypto/bn/asm/x86_64-mont5.pl b/crypto/bn/asm/x86_64-mont5.pl
index f1fbb45..3bb0cdf 100755
--- a/crypto/bn/asm/x86_64-mont5.pl
+++ b/crypto/bn/asm/x86_64-mont5.pl
@@ -1925,6 +1925,7 @@ __bn_sqr8x_reduction:
 
 .align	32
 .L8x_tail_done:
+	xor	%rax,%rax
 	add	(%rdx),%r8		# can this overflow?
 	adc	\$0,%r9
 	adc	\$0,%r10
@@ -1932,10 +1933,8 @@ __bn_sqr8x_reduction:
 	adc	\$0,%r12
 	adc	\$0,%r13
 	adc	\$0,%r14
-	adc	\$0,%r15		# can't overflow, because we
-					# started with "overhung" part
-					# of multiplication
-	xor	%rax,%rax
+	adc	\$0,%r15
+	adc	\$0,%rax
 
 	neg	$carry
 .L8x_no_tail:
@@ -3375,6 +3374,7 @@ __bn_sqrx8x_reduction:
 
 .align	32
 .Lsqrx8x_tail_done:
+	xor	%rax,%rax
 	add	24+8(%rsp),%r8		# can this overflow?
 	adc	\$0,%r9
 	adc	\$0,%r10
@@ -3382,10 +3382,8 @@ __bn_sqrx8x_reduction:
 	adc	\$0,%r12
 	adc	\$0,%r13
 	adc	\$0,%r14
-	adc	\$0,%r15		# can't overflow, because we
-					# started with "overhung" part
-					# of multiplication
-	mov	$carry,%rax		# xor	%rax,%rax
+	adc	\$0,%r15
+	adc	\$0,%rax
 
 	sub	16+8(%rsp),$carry	# mov 16(%rsp),%cf
 .Lsqrx8x_no_tail:			# %cf is 0 if jumped here
@@ -3400,7 +3398,7 @@ __bn_sqrx8x_reduction:
 	adc	8*5($tptr),%r13
 	adc	8*6($tptr),%r14
 	adc	8*7($tptr),%r15
-	adc	%rax,%rax		# top-most carry
+	adc	\$0,%rax		# top-most carry
 
 	mov	32+8(%rsp),%rbx		# n0
 	mov	8*8($tptr,%rcx),%rdx	# modulo-scheduled "%r8"

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