File 0244-multiboot-validate-multiboot-header.patch of Package qemu.15026

Overview Repositories Revisions Requests Users Attributes Meta

File 0244-multiboot-validate-multiboot-header.patch of Package qemu.15026

From bd7cdf16aba2fd50385bfacf68f84d249c98a350 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Thu, 7 Sep 2017 12:02:56 +0530
Subject: [PATCH] multiboot: validate multiboot header address values

While loading kernel via multiboot-v1 image, (flags & 0x00010000)
indicates that multiboot header contains valid addresses to load
the kernel image. These addresses are used to compute kernel
size and kernel text offset in the OS image. Validate these
address values to avoid an OOB access issue.

This is CVE-2017-14167.

Reported-by: Thomas Garnier <thgarnie@google.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <20170907063256.7418-1-ppandit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit ed4f86e8b6eff8e600c69adee68c7cd34dd2cccb)
[FL: BSC#1057585 CVE-2017-14167]
Signed-off-by: Fei Li <fli@suse.com>
---
 hw/i386/multiboot.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/hw/i386/multiboot.c b/hw/i386/multiboot.c
index 387caa67d4..950a09c0d1 100644
--- a/hw/i386/multiboot.c
+++ b/hw/i386/multiboot.c
@@ -221,15 +221,34 @@ int load_multiboot(FWCfgState *fw_cfg,
         uint32_t mh_header_addr = ldl_p(header+i+12);
         uint32_t mh_load_end_addr = ldl_p(header+i+20);
         uint32_t mh_bss_end_addr = ldl_p(header+i+24);
+
         mh_load_addr = ldl_p(header+i+16);
+        if (mh_header_addr < mh_load_addr) {
+            fprintf(stderr, "invalid mh_load_addr address\n");
+            exit(1);
+        }
+
         uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
         uint32_t mb_load_size = 0;
         mh_entry_addr = ldl_p(header+i+28);
 
         if (mh_load_end_addr) {
+            if (mh_bss_end_addr < mh_load_addr) {
+                fprintf(stderr, "invalid mh_bss_end_addr address\n");
+                exit(1);
+            }
             mb_kernel_size = mh_bss_end_addr - mh_load_addr;
+
+            if (mh_load_end_addr < mh_load_addr) {
+                fprintf(stderr, "invalid mh_load_end_addr address\n");
+                exit(1);
+            }
             mb_load_size = mh_load_end_addr - mh_load_addr;
         } else {
+            if (kernel_file_size < mb_kernel_text_offset) {
+                fprintf(stderr, "invalid kernel_file_size\n");
+                exit(1);
+            }
             mb_kernel_size = kernel_file_size - mb_kernel_text_offset;
             mb_load_size = mb_kernel_size;
         }

Places

File 0244-multiboot-validate-multiboot-header.patch of Package qemu.15026

Places