Re: [RFC] IMA LSM based rule race condition issue on 4.19 LTS

On Fri, Dec 09, 2022 at 03:00:35PM +0800, Guozihua (Scott) wrote:

Hi community.

Previously our team reported a race condition in IMA relates to LSM based rules which would case IMA to match files that should be filtered out under normal condition. The issue was originally analyzed and fixed on mainstream. The patch and the discussion could be found here: https://lore.kernel.org/all/20220921125804.59490-1-guozihua@huawei.com/

After that, we did a regression test on 4.19 LTS and the same issue arises. Further analysis reveled that the issue is from a completely different cause.

What commit in the tree fixed this in newer kernels? Why can't we just backport that one to 4.19.y as well?

thanks,

greg k-h