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From b8c8288a65146952cdfe7d5f0cd96734c9de8ee1 Mon Sep 17 00:00:00 2001
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From: jmaloy <jmaloy@redhat.com>
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Date: Thu, 7 May 2020 17:57:08 +0100
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Subject: [PATCH 1/7] target/arm: Fix PAuth sbox functions
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: jmaloy <jmaloy@redhat.com>
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Message-id: <20200507175708.1165177-2-jmaloy@redhat.com>
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Patchwork-id: 96341
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O-Subject: [RHEL-AV-8.2.1 qemu-kvm PATCH 1/1] target/arm: Fix PAuth sbox functions
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Bugzilla: 1813940
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RH-Acked-by: Andrew Jones <drjones@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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From: Vincent Dehors <vincent.dehors@smile.fr>
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In the PAC computation, sbox was applied over wrong bits.
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As this is a 4-bit sbox, bit index should be incremented by 4 instead of 16.
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Test vector from QARMA paper (https://eprint.iacr.org/2016/444.pdf) was
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used to verify one computation of the pauth_computepac() function which
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uses sbox2.
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Launchpad: https://bugs.launchpad.net/bugs/1859713
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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
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Signed-off-by: Vincent DEHORS <vincent.dehors@smile.fr>
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Signed-off-by: Adrien GRASSEIN <adrien.grassein@smile.fr>
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Message-id: 20200116230809.19078-2-richard.henderson@linaro.org
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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(cherry picked from commit de0b1bae6461f67243282555475f88b2384a1eb9)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/arm/pauth_helper.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/target/arm/pauth_helper.c b/target/arm/pauth_helper.c
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index d3194f2..0a5f41e 100644
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--- a/target/arm/pauth_helper.c
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+++ b/target/arm/pauth_helper.c
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@@ -89,7 +89,7 @@ static uint64_t pac_sub(uint64_t i)
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uint64_t o = 0;
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int b;
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- for (b = 0; b < 64; b += 16) {
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+ for (b = 0; b < 64; b += 4) {
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o |= (uint64_t)sub[(i >> b) & 0xf] << b;
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}
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return o;
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@@ -104,7 +104,7 @@ static uint64_t pac_inv_sub(uint64_t i)
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uint64_t o = 0;
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int b;
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- for (b = 0; b < 64; b += 16) {
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+ for (b = 0; b < 64; b += 4) {
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o |= (uint64_t)inv_sub[(i >> b) & 0xf] << b;
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}
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return o;
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--
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1.8.3.1
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