132 lines
4.8 KiB
Diff
132 lines
4.8 KiB
Diff
From d66ae008007853df7d3a24bd2d5e7494f53f007c Mon Sep 17 00:00:00 2001
|
|
From: Greg Kurz <gkurz@redhat.com>
|
|
Date: Thu, 7 Jan 2021 10:10:20 -0500
|
|
Subject: spapr: Fix buffer overflow in spapr_numa_associativity_init()
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
RH-Author: Greg Kurz <gkurz@redhat.com>
|
|
Message-id: <20210107101020.579456-2-gkurz@redhat.com>
|
|
Patchwork-id: 100515
|
|
O-Subject: [RHEL-AV-8.4.0 qemu-kvm PATCH 1/1] spapr: Fix buffer overflow in spapr_numa_associativity_init()
|
|
Bugzilla: 1908693
|
|
RH-Acked-by: David Gibson <dgibson@redhat.com>
|
|
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
|
|
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
|
|
|
|
From: Greg Kurz <groug@kaod.org>
|
|
|
|
Running a guest with 128 NUMA nodes crashes QEMU:
|
|
|
|
../../util/error.c:59: error_setv: Assertion `*errp == NULL' failed.
|
|
|
|
The crash happens when setting the FWNMI migration blocker:
|
|
|
|
2861 if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI) == SPAPR_CAP_ON) {
|
|
2862 /* Create the error string for live migration blocker */
|
|
2863 error_setg(&spapr->fwnmi_migration_blocker,
|
|
2864 "A machine check is being handled during migration. The handler"
|
|
2865 "may run and log hardware error on the destination");
|
|
2866 }
|
|
|
|
Inspection reveals that papr->fwnmi_migration_blocker isn't NULL:
|
|
|
|
(gdb) p spapr->fwnmi_migration_blocker
|
|
$1 = (Error *) 0x8000000004000000
|
|
|
|
Since this is the only place where papr->fwnmi_migration_blocker is
|
|
set, this means someone wrote there in our back. Further analysis
|
|
points to spapr_numa_associativity_init(), especially the part
|
|
that initializes the associative arrays for NVLink GPUs:
|
|
|
|
max_nodes_with_gpus = nb_numa_nodes + NVGPU_MAX_NUM;
|
|
|
|
ie. max_nodes_with_gpus = 128 + 6, but the array isn't sized to
|
|
accommodate the 6 extra nodes:
|
|
|
|
struct SpaprMachineState {
|
|
.
|
|
.
|
|
.
|
|
uint32_t numa_assoc_array[MAX_NODES][NUMA_ASSOC_SIZE];
|
|
|
|
Error *fwnmi_migration_blocker;
|
|
};
|
|
|
|
and the following loops happily overwrite spapr->fwnmi_migration_blocker,
|
|
and probably more:
|
|
|
|
for (i = nb_numa_nodes; i < max_nodes_with_gpus; i++) {
|
|
spapr->numa_assoc_array[i][0] = cpu_to_be32(MAX_DISTANCE_REF_POINTS);
|
|
|
|
for (j = 1; j < MAX_DISTANCE_REF_POINTS; j++) {
|
|
uint32_t gpu_assoc = smc->pre_5_1_assoc_refpoints ?
|
|
SPAPR_GPU_NUMA_ID : cpu_to_be32(i);
|
|
spapr->numa_assoc_array[i][j] = gpu_assoc;
|
|
}
|
|
|
|
spapr->numa_assoc_array[i][MAX_DISTANCE_REF_POINTS] = cpu_to_be32(i);
|
|
}
|
|
|
|
Fix the size of the array. This requires "hw/ppc/spapr.h" to see
|
|
NVGPU_MAX_NUM. Including "hw/pci-host/spapr.h" introduces a
|
|
circular dependency that breaks the build, so this moves the
|
|
definition of NVGPU_MAX_NUM to "hw/ppc/spapr.h" instead.
|
|
|
|
Reported-by: Min Deng <mdeng@redhat.com>
|
|
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1908693
|
|
Fixes: dd7e1d7ae431 ("spapr_numa: move NVLink2 associativity handling to spapr_numa.c")
|
|
Cc: danielhb413@gmail.com
|
|
Signed-off-by: Greg Kurz <groug@kaod.org>
|
|
Message-Id: <160829960428.734871.12634150161215429514.stgit@bahia.lan>
|
|
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
|
|
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
|
|
(cherry picked from commit 30499fdd9883026e106d74e8199e2f1311fd4011)
|
|
Signed-off-by: Greg Kurz <gkurz@redhat.com>
|
|
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
|
|
---
|
|
include/hw/pci-host/spapr.h | 2 --
|
|
include/hw/ppc/spapr.h | 5 ++++-
|
|
2 files changed, 4 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/include/hw/pci-host/spapr.h b/include/hw/pci-host/spapr.h
|
|
index 4f58f0223b..bd014823a9 100644
|
|
--- a/include/hw/pci-host/spapr.h
|
|
+++ b/include/hw/pci-host/spapr.h
|
|
@@ -115,8 +115,6 @@ struct SpaprPhbState {
|
|
#define SPAPR_PCI_NV2RAM64_WIN_BASE SPAPR_PCI_LIMIT
|
|
#define SPAPR_PCI_NV2RAM64_WIN_SIZE (2 * TiB) /* For up to 6 GPUs 256GB each */
|
|
|
|
-/* Max number of these GPUsper a physical box */
|
|
-#define NVGPU_MAX_NUM 6
|
|
/* Max number of NVLinks per GPU in any physical box */
|
|
#define NVGPU_MAX_LINKS 3
|
|
|
|
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
|
|
index ba2d81404b..28bbf07f8f 100644
|
|
--- a/include/hw/ppc/spapr.h
|
|
+++ b/include/hw/ppc/spapr.h
|
|
@@ -112,6 +112,9 @@ typedef enum {
|
|
#define NUMA_ASSOC_SIZE (MAX_DISTANCE_REF_POINTS + 1)
|
|
#define VCPU_ASSOC_SIZE (NUMA_ASSOC_SIZE + 1)
|
|
|
|
+/* Max number of these GPUsper a physical box */
|
|
+#define NVGPU_MAX_NUM 6
|
|
+
|
|
typedef struct SpaprCapabilities SpaprCapabilities;
|
|
struct SpaprCapabilities {
|
|
uint8_t caps[SPAPR_CAP_NUM];
|
|
@@ -243,7 +246,7 @@ struct SpaprMachineState {
|
|
unsigned gpu_numa_id;
|
|
SpaprTpmProxy *tpm_proxy;
|
|
|
|
- uint32_t numa_assoc_array[MAX_NODES][NUMA_ASSOC_SIZE];
|
|
+ uint32_t numa_assoc_array[MAX_NODES + NVGPU_MAX_NUM][NUMA_ASSOC_SIZE];
|
|
|
|
Error *fwnmi_migration_blocker;
|
|
};
|
|
--
|
|
2.18.4
|
|
|