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* [PATCH] hw/rdma: Fix possible mremap overflow in the pvrdma device (CVE-2021-3582)
@ 2021-06-16 11:06 Marcel Apfelbaum
  2021-06-17  9:38 ` P J P
  2021-06-18  9:03 ` Yuval Shaia
  0 siblings, 2 replies; 3+ messages in thread
From: Marcel Apfelbaum @ 2021-06-16 11:06 UTC (permalink / raw)
  To: qemu-devel; +Cc: mcascell, pjp, mst, yuval.shaia.ml, vv474172261

From: Marcel Apfelbaum <marcel@redhat.com>

Ensure mremap boundaries not trusting the guest kernel to
pass the correct buffer length.

Fixes: CVE-2021-3582
Reported-by: VictorV (Kunlun Lab) <vv474172261@gmail.com>
Tested-by: VictorV (Kunlun Lab) <vv474172261@gmail.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---
 hw/rdma/vmw/pvrdma_cmd.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/rdma/vmw/pvrdma_cmd.c b/hw/rdma/vmw/pvrdma_cmd.c
index f59879e257..dadab4966b 100644
--- a/hw/rdma/vmw/pvrdma_cmd.c
+++ b/hw/rdma/vmw/pvrdma_cmd.c
@@ -38,6 +38,12 @@ static void *pvrdma_map_to_pdir(PCIDevice *pdev, uint64_t pdir_dma,
         return NULL;
     }
 
+    length = ROUND_UP(length, TARGET_PAGE_SIZE);
+    if (nchunks * TARGET_PAGE_SIZE != length) {
+        rdma_error_report("Invalid nchunks/length (%u, %lu)", nchunks, length);
+        return NULL;
+    }
+
     dir = rdma_pci_dma_map(pdev, pdir_dma, TARGET_PAGE_SIZE);
     if (!dir) {
         rdma_error_report("Failed to map to page directory");
-- 
2.17.2



^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2021-06-18  9:04 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-06-16 11:06 [PATCH] hw/rdma: Fix possible mremap overflow in the pvrdma device (CVE-2021-3582) Marcel Apfelbaum
2021-06-17  9:38 ` P J P
2021-06-18  9:03 ` Yuval Shaia

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