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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

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Source: https://github.com/qemu/qemu
MR: 119832
Type: Security Fix
Disposition: Backport from 418ade7849
ChangeID: 1246afd7bb950d2d5fe2e198961797c0fa14ac00
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: 7c3043df56b3090138fe56f8c06df5ca08cafd26)

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 13:25:44 +05:30
committed by Richard Purdie
parent 9e7f4a7db2
commit 25606f450d
2 changed files with 54 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
meta/recipes-devtools/qemu/qemu.inc
View File

@@ -98,6 +98,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
file://CVE-2020-13253_4.patch \
file://CVE-2020-13253_5.patch \
file://CVE-2020-13791.patch \
file://CVE-2022-35414.patch \
"
UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"

53
meta/recipes-devtools/qemu/qemu/CVE-2022-35414.patch Normal file
View File

@@ -0,0 +1,53 @@
From 09a07b5b39c87423df9e8f6574c19a14d36beac5 Mon Sep 17 00:00:00 2001
From: Hitendra Prajapati <hprajapati@mvista.com>
Date: Wed, 27 Jul 2022 10:34:12 +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>
---
exec.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/exec.c b/exec.c
index 43c70ffb..2d6add46 100644
--- a/exec.c
+++ b/exec.c
@@ -685,7 +685,7 @@ static void tcg_iommu_free_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)
{
@@ -694,6 +694,7 @@ address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
IOMMUMemoryRegionClass *imrc;
IOMMUTLBEntry iotlb;
int iommu_idx;
+ hwaddr addr = orig_addr;
AddressSpaceDispatch *d = atomic_rcu_read(&cpu->cpu_ases[asidx].memory_dispatch);
for (;;) {
@@ -737,6 +738,16 @@ 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];
}
#endif
--
2.25.1