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From f01098bb86c12f485895f38f7a24170ec84b60b6 Mon Sep 17 00:00:00 2001
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From: Greg Kurz <gkurz@redhat.com>
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Date: Mon, 8 Jun 2020 16:25:21 -0400
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Subject: [PATCH 42/42] vfio/nvlink: Remove exec permission to avoid SELinux
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AVCs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Greg Kurz <gkurz@redhat.com>
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Message-id: <20200608162521.382858-2-gkurz@redhat.com>
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Patchwork-id: 97459
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O-Subject: [RHEL-8.3.0 qemu-kvm PATCH 1/1] vfio/nvlink: Remove exec permission to avoid SELinux AVCs
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Bugzilla: 1823275
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RH-Acked-by: David Gibson <dgibson@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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From: Leonardo Bras <leobras.c@gmail.com>
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If SELinux is setup without 'execmem' permission for qemu, all mmap
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with (PROT_WRITE | PROT_EXEC) will fail and print a warning in
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SELinux log.
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If "nvlink2-mr" memory allocation fails (fist diff), it will cause
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guest NUMA nodes to not be correctly configured (V100 memory will
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not be visible for guest, nor its NUMA nodes).
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Not having 'execmem' permission is intesting for virtual machines to
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avoid buffer-overflow based attacks, and it's adopted in distros
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like RHEL.
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So, removing the PROT_EXEC flag seems the right thing to do.
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Browsing some other code that mmaps memory for usage with
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memory_region_init_ram_device_ptr, I could notice it's usual to
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not have PROT_EXEC (only PROT_READ | PROT_WRITE), so it should be
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no problem around this.
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Signed-off-by: Leonardo Bras <leobras.c@gmail.com>
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Message-Id: <20200501055448.286518-1-leobras.c@gmail.com>
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Acked-by: Alex Williamson <alex.williamson@redhat.com>
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Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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(cherry picked from commit 9c7c0407028355ca83349b8a60fddfad46f2ebd8)
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Signed-off-by: Greg Kurz <groug@kaod.org>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/vfio/pci-quirks.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/vfio/pci-quirks.c b/hw/vfio/pci-quirks.c
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index 4505ffe48a..1c5fe014cf 100644
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--- a/hw/vfio/pci-quirks.c
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+++ b/hw/vfio/pci-quirks.c
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@@ -2237,7 +2237,7 @@ int vfio_pci_nvidia_v100_ram_init(VFIOPCIDevice *vdev, Error **errp)
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}
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cap = (void *) hdr;
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- p = mmap(NULL, nv2reg->size, PROT_READ | PROT_WRITE | PROT_EXEC,
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+ p = mmap(NULL, nv2reg->size, PROT_READ | PROT_WRITE,
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MAP_SHARED, vdev->vbasedev.fd, nv2reg->offset);
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if (p == MAP_FAILED) {
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ret = -errno;
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@@ -2297,7 +2297,7 @@ int vfio_pci_nvlink2_init(VFIOPCIDevice *vdev, Error **errp)
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/* Some NVLink bridges may not have assigned ATSD */
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if (atsdreg->size) {
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- p = mmap(NULL, atsdreg->size, PROT_READ | PROT_WRITE | PROT_EXEC,
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+ p = mmap(NULL, atsdreg->size, PROT_READ | PROT_WRITE,
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MAP_SHARED, vdev->vbasedev.fd, atsdreg->offset);
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if (p == MAP_FAILED) {
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ret = -errno;
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--
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2.27.0
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