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openSUSE:Step:15-SP4
qemu.30222
hw-rdma-Fix-possible-mremap-overflow-in-.patch
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File hw-rdma-Fix-possible-mremap-overflow-in-.patch of Package qemu.30222
From: Marcel Apfelbaum <marcel@redhat.com> Date: Wed, 16 Jun 2021 14:06:00 +0300 Subject: hw/rdma: Fix possible mremap overflow in the pvrdma device (CVE-2021-3582) Git-commit: 284f191b4abad213aed04cb0458e1600fd18d7c4 References: CVE-2021-3582 bsc#1187499 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> Signed-off-by: Jose R. Ziviani <jziviani@suse.de> --- hw/rdma/vmw/pvrdma_cmd.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/rdma/vmw/pvrdma_cmd.c b/hw/rdma/vmw/pvrdma_cmd.c index 692125ac26815fc0d9180e69adbf..1df0b256fa88e092767e18c471cb 100644 --- a/hw/rdma/vmw/pvrdma_cmd.c +++ b/hw/rdma/vmw/pvrdma_cmd.c @@ -38,6 +38,13 @@ 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, + (unsigned long)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");
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