Re: [PATCH 4.19 0/3] BPF fixes for CVE-2021-3444 and CVE-2021-3600

On Fri, Aug 27, 2021 at 10:55:30AM -0300, Thadeu Lima de Souza Cascardo wrote:

The upstream changes necessary to fix these CVEs rely on the presence of JMP32, which is not a small backport and brings its own potential set of necessary follow-ups.

Daniel Borkmann, John Fastabend and Alexei Starovoitov came up with a fix involving the use of the AX register.

This has been tested against the test_verifier in 4.19.y tree and some tests specific to the two referred CVEs.

THanks for these, now queued up!

greg k-h