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Date: Mon, 1 Aug 2022 08:13:57 -0500 From: Frederick Lawler <fred@...udflare.com> To: Paul Moore <paul@...l-moore.com>, Martin KaFai Lau <kafai@...com> Cc: kpsingh@...nel.org, revest@...omium.org, jackmanb@...omium.org, ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, songliubraving@...com, yhs@...com, john.fastabend@...il.com, jmorris@...ei.org, serge@...lyn.com, stephen.smalley.work@...il.com, eparis@...isplace.org, shuah@...nel.org, brauner@...nel.org, casey@...aufler-ca.com, ebiederm@...ssion.com, bpf@...r.kernel.org, linux-security-module@...r.kernel.org, selinux@...r.kernel.org, linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, kernel-team@...udflare.com, cgzones@...glemail.com, karl@...badwolfsecurity.com Subject: Re: [PATCH v3 0/4] Introduce security_create_user_ns() On 7/22/22 7:20 AM, Paul Moore wrote: > On July 22, 2022 2:12:03 AM Martin KaFai Lau <kafai@...com> wrote: > >> On Thu, Jul 21, 2022 at 12:28:04PM -0500, Frederick Lawler wrote: >>> While creating a LSM BPF MAC policy to block user namespace creation, we >>> used the LSM cred_prepare hook because that is the closest hook to prevent >>> a call to create_user_ns(). >>> >>> The calls look something like this: >>> >>> cred = prepare_creds() >>> security_prepare_creds() >>> call_int_hook(cred_prepare, ... >>> if (cred) >>> create_user_ns(cred) >>> >>> We noticed that error codes were not propagated from this hook and >>> introduced a patch [1] to propagate those errors. >>> >>> The discussion notes that security_prepare_creds() >>> is not appropriate for MAC policies, and instead the hook is >>> meant for LSM authors to prepare credentials for mutation. [2] >>> >>> Ultimately, we concluded that a better course of action is to introduce >>> a new security hook for LSM authors. [3] >>> >>> This patch set first introduces a new security_create_user_ns() function >>> and userns_create LSM hook, then marks the hook as sleepable in BPF. >> Patch 1 and 4 still need review from the lsm/security side. > > > This patchset is in my review queue and assuming everything checks out, I expect to merge it after the upcoming merge window closes. > > I would also need an ACK from the BPF LSM folks, but they're CC'd on this patchset. > Based on last weeks comments, should I go ahead and put up v4 for 5.20-rc1 when that drops, or do I need to wait for more feedback? > -- > paul-moore.com > >
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