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[PULL,1/3] hw/rdma: Fix possible mremap overflow in the pvrdma device (CVE-2021-3582)

Message ID 20210704105646.13524-2-marcel.apfelbaum@gmail.com (mailing list archive)
State New, archived
Headers show
Series [PULL,1/3] hw/rdma: Fix possible mremap overflow in the pvrdma device (CVE-2021-3582) | expand

Commit Message

Marcel Apfelbaum July 4, 2021, 10:56 a.m. UTC 
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>
Message-Id: <20210616110600.20889-1-marcel.apfelbaum@gmail.com>
Reviewed-by: Yuval Shaia <yuval.shaia.ml@gmail.com>
Tested-by: Yuval Shaia <yuval.shaia.ml@gmail.com>
Reviewed-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
---
 hw/rdma/vmw/pvrdma_cmd.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

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");