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qemu: CVE-2022-35414 can perform an uninitialized read on the translate_fail path, leading to an io_readx or io_writex crash

Browse Source 
Source: https://github.com/qemu/qemu
MR: 119830
Type: Security Fix
Disposition: Backport from https://github.com/qemu/qemu/commit/418ade7849ce7641c0f7333718caf5091a02fd4c
ChangeID: 41d6646e06319e629da574b9b2e8a3a197a73441
Description:
        CVE-2022-35414 qemu: can perform an uninitialized read on the translate_fail path, leading to an io_readx or io_writex crash.

(From OE-Core rev: 5f236e744b5b528bdf8d95c9580c273f63c04452)

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Hitendra Prajapati
2022-07-27 12:23:25 +05:30
committed by Richard Purdie
parent 27fde9cc2a
commit caae799d63
2 changed files with 54 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta/recipes-devtools/qemu/qemu.inc
+1
View File
@@ -35,6 +35,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
file://pvrdma.patch \ file://pvrdma.patch \
file://CVE-2021-4206.patch \ file://CVE-2021-4206.patch \
file://CVE-2021-4207.patch \ file://CVE-2021-4207.patch \
file://CVE-2022-35414.patch \
" "
UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar" UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
meta/recipes-devtools/qemu/qemu/CVE-2022-35414.patch
+53
View File
@@ -0,0 +1,53 @@
From ee76e64ee1cb232b77652b21cc94ec6b6c7e4b13 Mon Sep 17 00:00:00 2001
From: Hitendra Prajapati <hprajapati@mvista.com>
Date: Wed, 27 Jul 2022 10:49:47 +0530
Subject: [PATCH] CVE-2022-35414
Upstream-Status: Backport [https://github.com/qemu/qemu/commit/418ade7849ce7641c0f7333718caf5091a02fd4c]
CVE: CVE-2022-35414
Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
---
softmmu/physmem.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index 3524c04c2..3c467527d 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -667,7 +667,7 @@ void tcg_iommu_init_notifier_list(CPUState *cpu)
/* Called from RCU critical section */
MemoryRegionSection *
-address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
+address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr orig_addr,
hwaddr *xlat, hwaddr *plen,
MemTxAttrs attrs, int *prot)
{
@@ -676,6 +676,7 @@ address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
IOMMUMemoryRegionClass *imrc;
IOMMUTLBEntry iotlb;
int iommu_idx;
+ hwaddr addr = orig_addr;
AddressSpaceDispatch *d =
qatomic_rcu_read(&cpu->cpu_ases[asidx].memory_dispatch);
@@ -720,6 +721,16 @@ address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
return section;
translate_fail:
+ /*
+ * We should be given a page-aligned address -- certainly
+ * tlb_set_page_with_attrs() does so. The page offset of xlat
+ * is used to index sections[], and PHYS_SECTION_UNASSIGNED = 0.
+ * The page portion of xlat will be logged by memory_region_access_valid()
+ * when this memory access is rejected, so use the original untranslated
+ * physical address.
+ */
+ assert((orig_addr & ~TARGET_PAGE_MASK) == 0);
+ *xlat = orig_addr;
return &d->map.sections[PHYS_SECTION_UNASSIGNED];
}
--
2.25.1