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From 5b139f95c9a47a55a0c54100f3837b1eee942b04 Mon Sep 17 00:00:00 2001
From: Rohan McLure <rmclure@linux.ibm.com>
Date: Thu, 4 Jan 2024 10:25:50 +0100
Subject: [PATCH] poly1305-ppc.pl: Fix vector register clobbering
Fixes CVE-2023-6129
The POLY1305 MAC (message authentication code) implementation in OpenSSL for
PowerPC CPUs saves the the contents of vector registers in different order
than they are restored. Thus the contents of some of these vector registers
is corrupted when returning to the caller. The vulnerable code is used only
on newer PowerPC processors supporting the PowerISA 2.07 instructions.
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23200)
(cherry picked from commit 8d847a3ffd4f0b17ee33962cf69c36224925b34f)
CVE: CVE-2023-6129
Upstream-Status: Backport
Signed-off-by: Ross Burton <ross.burton@arm.com>
---
crypto/poly1305/asm/poly1305-ppc.pl | 42 ++++++++++++++---------------
1 file changed, 21 insertions(+), 21 deletions(-)
diff --git a/crypto/poly1305/asm/poly1305-ppc.pl b/crypto/poly1305/asm/poly1305-ppc.pl
index 9f86134d923fb..2e601bb9c24be 100755
--- a/crypto/poly1305/asm/poly1305-ppc.pl
+++ b/crypto/poly1305/asm/poly1305-ppc.pl
@@ -744,7 +744,7 @@
my $LOCALS= 6*$SIZE_T;
my $VSXFRAME = $LOCALS + 6*$SIZE_T;
$VSXFRAME += 128; # local variables
- $VSXFRAME += 13*16; # v20-v31 offload
+ $VSXFRAME += 12*16; # v20-v31 offload
my $BIG_ENDIAN = ($flavour !~ /le/) ? 4 : 0;
@@ -919,12 +919,12 @@
addi r11,r11,32
stvx v22,r10,$sp
addi r10,r10,32
- stvx v23,r10,$sp
- addi r10,r10,32
- stvx v24,r11,$sp
+ stvx v23,r11,$sp
addi r11,r11,32
- stvx v25,r10,$sp
+ stvx v24,r10,$sp
addi r10,r10,32
+ stvx v25,r11,$sp
+ addi r11,r11,32
stvx v26,r10,$sp
addi r10,r10,32
stvx v27,r11,$sp
@@ -1153,12 +1153,12 @@
addi r11,r11,32
stvx v22,r10,$sp
addi r10,r10,32
- stvx v23,r10,$sp
- addi r10,r10,32
- stvx v24,r11,$sp
+ stvx v23,r11,$sp
addi r11,r11,32
- stvx v25,r10,$sp
+ stvx v24,r10,$sp
addi r10,r10,32
+ stvx v25,r11,$sp
+ addi r11,r11,32
stvx v26,r10,$sp
addi r10,r10,32
stvx v27,r11,$sp
@@ -1899,26 +1899,26 @@
mtspr 256,r12 # restore vrsave
lvx v20,r10,$sp
addi r10,r10,32
- lvx v21,r10,$sp
- addi r10,r10,32
- lvx v22,r11,$sp
+ lvx v21,r11,$sp
addi r11,r11,32
- lvx v23,r10,$sp
+ lvx v22,r10,$sp
addi r10,r10,32
- lvx v24,r11,$sp
+ lvx v23,r11,$sp
addi r11,r11,32
- lvx v25,r10,$sp
+ lvx v24,r10,$sp
addi r10,r10,32
- lvx v26,r11,$sp
+ lvx v25,r11,$sp
addi r11,r11,32
- lvx v27,r10,$sp
+ lvx v26,r10,$sp
addi r10,r10,32
- lvx v28,r11,$sp
+ lvx v27,r11,$sp
addi r11,r11,32
- lvx v29,r10,$sp
+ lvx v28,r10,$sp
addi r10,r10,32
- lvx v30,r11,$sp
- lvx v31,r10,$sp
+ lvx v29,r11,$sp
+ addi r11,r11,32
+ lvx v30,r10,$sp
+ lvx v31,r11,$sp
$POP r27,`$VSXFRAME-$SIZE_T*5`($sp)
$POP r28,`$VSXFRAME-$SIZE_T*4`($sp)
$POP r29,`$VSXFRAME-$SIZE_T*3`($sp)
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