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authorRaphael Norwitz2022-01-17 05:12:24 +0100
committerMichael S. Tsirkin2022-02-04 15:07:43 +0100
commit316ee11144e3b8e1bc97a1d0fc6b1caf1963e104 (patch)
tree70ddbaa0375d325d4047246db8eccdb3be09e299 /subprojects
parenttests: acpi: test short OEM_ID/OEM_TABLE_ID values in test_oem_fields() (diff)
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libvhost-user: Add vu_rem_mem_reg input validation
Today if multiple FDs are sent from the VMM to the backend in a VHOST_USER_REM_MEM_REG message, one FD will be unmapped and the remaining FDs will be leaked. Therefore if multiple FDs are sent we report an error and fail the operation, closing all FDs in the message. Likewise in case the VMM sends a message with a size less than that of a memory region descriptor, we add a check to gracefully report an error and fail the operation rather than crashing. Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Message-Id: <20220117041050.19718-2-raphael.norwitz@nutanix.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com>
Diffstat (limited to 'subprojects')
-rw-r--r--subprojects/libvhost-user/libvhost-user.c15
-rw-r--r--subprojects/libvhost-user/libvhost-user.h2
2 files changed, 17 insertions, 0 deletions
diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvhost-user/libvhost-user.c
index 787f4d2d4f..b09b1c269e 100644
--- a/subprojects/libvhost-user/libvhost-user.c
+++ b/subprojects/libvhost-user/libvhost-user.c
@@ -801,6 +801,21 @@ vu_rem_mem_reg(VuDev *dev, VhostUserMsg *vmsg) {
VuDevRegion shadow_regions[VHOST_USER_MAX_RAM_SLOTS] = {};
VhostUserMemoryRegion m = vmsg->payload.memreg.region, *msg_region = &m;
+ if (vmsg->fd_num != 1) {
+ vmsg_close_fds(vmsg);
+ vu_panic(dev, "VHOST_USER_REM_MEM_REG received %d fds - only 1 fd "
+ "should be sent for this message type", vmsg->fd_num);
+ return false;
+ }
+
+ if (vmsg->size < VHOST_USER_MEM_REG_SIZE) {
+ close(vmsg->fds[0]);
+ vu_panic(dev, "VHOST_USER_REM_MEM_REG requires a message size of at "
+ "least %d bytes and only %d bytes were received",
+ VHOST_USER_MEM_REG_SIZE, vmsg->size);
+ return false;
+ }
+
DPRINT("Removing region:\n");
DPRINT(" guest_phys_addr: 0x%016"PRIx64"\n",
msg_region->guest_phys_addr);
diff --git a/subprojects/libvhost-user/libvhost-user.h b/subprojects/libvhost-user/libvhost-user.h
index 3d13dfadde..cde9f07bb3 100644
--- a/subprojects/libvhost-user/libvhost-user.h
+++ b/subprojects/libvhost-user/libvhost-user.h
@@ -129,6 +129,8 @@ typedef struct VhostUserMemoryRegion {
uint64_t mmap_offset;
} VhostUserMemoryRegion;
+#define VHOST_USER_MEM_REG_SIZE (sizeof(VhostUserMemoryRegion))
+
typedef struct VhostUserMemory {
uint32_t nregions;
uint32_t padding;