From 546f9e97d193307a2ca26c11bf1162d07cc2d31f Mon Sep 17 00:00:00 2001 From: Michael S. Tsirkin Date: Wed, 14 May 2014 08:52:59 +0200 Subject: [PATCH 24/31] hw/pci/pcie_aer.c: fix buffer overruns on invalid state load RH-Author: Michael S. Tsirkin Message-id: <1400057538-6975-6-git-send-email-mst@redhat.com> Patchwork-id: 58872 O-Subject: [PATCH qemu-kvm RHEL7.1 5/5] hw/pci/pcie_aer.c: fix buffer overruns on invalid state load Bugzilla: 1095716 RH-Acked-by: Dr. David Alan Gilbert (git) RH-Acked-by: Marcel Apfelbaum RH-Acked-by: Paolo Bonzini RH-Acked-by: Juan Quintela 4) CVE-2013-4529 hw/pci/pcie_aer.c pcie aer log can overrun the buffer if log_num is too large There are two issues in this file: 1. log_max from remote can be larger than on local then buffer will overrun with data coming from state file. 2. log_num can be larger then we get data corruption again with an overflow but not adversary controlled. Fix both issues. Reported-by: Anthony Liguori Reported-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Juan Quintela (cherry picked from commit 5f691ff91d323b6f97c6600405a7f9dc115a0ad1) Tested: lightly on developer's box Brew build: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=7452039 Bugzilla:1095716 --- hw/pci/pcie_aer.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) Signed-off-by: Miroslav Rezanina --- hw/pci/pcie_aer.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-) diff --git a/hw/pci/pcie_aer.c b/hw/pci/pcie_aer.c index 1ce72ce..ab5c9c6 100644 --- a/hw/pci/pcie_aer.c +++ b/hw/pci/pcie_aer.c @@ -795,6 +795,13 @@ static const VMStateDescription vmstate_pcie_aer_err = { } }; +static bool pcie_aer_state_log_num_valid(void *opaque, int version_id) +{ + PCIEAERLog *s = opaque; + + return s->log_num <= s->log_max; +} + const VMStateDescription vmstate_pcie_aer_log = { .name = "PCIE_AER_ERROR_LOG", .version_id = 1, @@ -802,7 +809,8 @@ const VMStateDescription vmstate_pcie_aer_log = { .minimum_version_id_old = 1, .fields = (VMStateField[]) { VMSTATE_UINT16(log_num, PCIEAERLog), - VMSTATE_UINT16(log_max, PCIEAERLog), + VMSTATE_UINT16_EQUAL(log_max, PCIEAERLog), + VMSTATE_VALIDATE("log_num <= log_max", pcie_aer_state_log_num_valid), VMSTATE_STRUCT_VARRAY_POINTER_UINT16(log, PCIEAERLog, log_num, vmstate_pcie_aer_err, PCIEAERErr), VMSTATE_END_OF_LIST() -- 1.7.1