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qemu: apply patch for CVE-2020-27617 #102481

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Merged
merged 1 commit into from
Nov 9, 2020
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qemu: apply patch for CVE-2020-27617 #102481

merged 1 commit into from
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mweinelt
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@mweinelt mweinelt commented Nov 2, 2020 •
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Motivation for this change

https://www.openwall.com/lists/oss-security/2020/11/02/1

An assert(3) failure issue was found in the networking helper functions of QEMU. It could occur in the eth_get_gso_type() routine, if a packet does not have a valid networking L3 protocol (ex. IPv4, IPv6) value. A guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Fixes: CVE-2020-27617

FWIW: I couldn't find the patch in the qemu git tree, but instead pulled it from https://patchew.org/QEMU/20201021060550.1652896-1-ppandit@redhat.com/. The qemu net subsystem maintainer Jason Wang stated that he applied the patch as is in https://lists.nongnu.org/archive/html/qemu-devel/2020-10/msg07341.html.

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.

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An assert(3) failure issue was found in the networking helper functions of QEMU. It could occur in the eth_get_gso_type() routine, if a packet does not have a valid networking L3 protocol (ex. IPv4, IPv6) value. A guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Fixes: CVE-2020-27617
@mweinelt mweinelt added the 1.severity: security Issues which raise a security issue, or PRs that fix one label Nov 2, 2020
@ofborg ofborg bot requested a review from edolstra November 2, 2020 13:17
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Result of nixpkgs-review pr 102481 run on x86_64-linux 1

1 package built:
  • qemu

@Ma27 Ma27 merged commit 5095791 into NixOS:master Nov 9, 2020
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Ma27 commented Nov 9, 2020

@mweinelt would you like to take care of the backport or should I do that? :)

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mweinelt commented Nov 9, 2020

I can do it in an hour or so. So if you're faster, go for it!

@mweinelt mweinelt deleted the qemu/cve-2020-27617 branch November 9, 2020 22:53
@mweinelt mweinelt mentioned this pull request Nov 9, 2020
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1.severity: security Issues which raise a security issue, or PRs that fix one 10.rebuild-darwin: 11-100 10.rebuild-linux: 11-100
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