File 0042-i386-kvmvapic-initialise-imm32-vari.patch of Package qemu

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File 0042-i386-kvmvapic-initialise-imm32-vari.patch of Package qemu (Revision 493cc9aa96d045bf944d0959c722d379)

Currently displaying revision 493cc9aa96d045bf944d0959c722d379 , Show latest

From 481b43bcc3e920bbe48801a7ad2489260747e8b9 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Thu, 7 Apr 2016 12:50:08 +0530
Subject: [PATCH] i386: kvmvapic: initialise imm32 variable

When processing Task Priorty Register(TPR) access, it could leak
automatic stack variable 'imm32' in patch_instruction().
Initialise the variable to avoid it.

Reported by: Donghai Zdh <donghai.zdh@alibaba-inc.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <1460013608-16670-1-git-send-email-ppandit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

(cherry picked from commit 691a02e2ce0c413236a78dee6f2651c937b09fb0)
[BR: BSC#975700 CVE-2016-4020]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/i386/kvmvapic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/i386/kvmvapic.c b/hw/i386/kvmvapic.c
index c69f374..ff1e31a 100644
--- a/hw/i386/kvmvapic.c
+++ b/hw/i386/kvmvapic.c
@@ -394,7 +394,7 @@ static void patch_instruction(VAPICROMState *s, X86CPU *cpu, target_ulong ip)
     CPUX86State *env = &cpu->env;
     VAPICHandlers *handlers;
     uint8_t opcode[2];
-    uint32_t imm32;
+    uint32_t imm32 = 0;
     target_ulong current_pc = 0;
     target_ulong current_cs_base = 0;
     int current_flags = 0;

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File 0042-i386-kvmvapic-initialise-imm32-vari.patch of Package qemu (Revision 493cc9aa96d045bf944d0959c722d379)

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