summaryrefslogtreecommitdiffstats
path: root/meta/recipes-devtools/qemu/qemu/CVE-2020-10702.patch
blob: 21a3ceb30df329b47632e440b5bc7ecc57d5d5fe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
From de0b1bae6461f67243282555475f88b2384a1eb9 Mon Sep 17 00:00:00 2001
From: Vincent Dehors <vincent.dehors@smile.fr>
Date: Thu, 23 Jan 2020 15:22:38 +0000
Subject: [PATCH] target/arm: Fix PAuth sbox functions

In the PAC computation, sbox was applied over wrong bits.
As this is a 4-bit sbox, bit index should be incremented by 4 instead of 16.

Test vector from QARMA paper (https://eprint.iacr.org/2016/444.pdf) was
used to verify one computation of the pauth_computepac() function which
uses sbox2.

Launchpad: https://bugs.launchpad.net/bugs/1859713
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Vincent DEHORS <vincent.dehors@smile.fr>
Signed-off-by: Adrien GRASSEIN <adrien.grassein@smile.fr>
Message-id: 20200116230809.19078-2-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Upstream-Status: Backport [https://git.qemu.org/?p=qemu.git;a=patch;h=de0b1bae6461f67243282555475f88b2384a1eb9] 
CVE: CVE-2020-10702
Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
---
 target/arm/pauth_helper.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/arm/pauth_helper.c b/target/arm/pauth_helper.c
index d3194f2..0a5f41e 100644
--- a/target/arm/pauth_helper.c
+++ b/target/arm/pauth_helper.c
@@ -89,7 +89,7 @@ static uint64_t pac_sub(uint64_t i)
     uint64_t o = 0;
     int b;
 
-    for (b = 0; b < 64; b += 16) {
+    for (b = 0; b < 64; b += 4) {
         o |= (uint64_t)sub[(i >> b) & 0xf] << b;
     }
     return o;
@@ -104,7 +104,7 @@ static uint64_t pac_inv_sub(uint64_t i)
     uint64_t o = 0;
     int b;
 
-    for (b = 0; b < 64; b += 16) {
+    for (b = 0; b < 64; b += 4) {
         o |= (uint64_t)inv_sub[(i >> b) & 0xf] << b;
     }
     return o;
-- 
1.8.3.1