netdev - Re: [PATCH 00/18] bpf: Secure and authenticated preloading of eBPF programs

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Date:   Mon, 4 Apr 2022 09:44:59 +0200
From:   Djalal Harouni <tixxdz@...il.com>
To:     KP Singh <kpsingh@...nel.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        "corbet@....net" <corbet@....net>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "andrii@...nel.org" <andrii@...nel.org>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "alexandre.torgue@...s.st.com" <alexandre.torgue@...s.st.com>,
        "zohar@...ux.ibm.com" <zohar@...ux.ibm.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/18] bpf: Secure and authenticated preloading of eBPF programs

On Sun, Apr 3, 2022 at 5:42 PM KP Singh <kpsingh@...nel.org> wrote:
>
> On Sat, Apr 2, 2022 at 1:55 AM Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:
...
> >
> > > Pinning
> > > them to unreachable inodes intuitively looked the
> > > way to go for achieving the stated goal.
> >
> > We can consider inodes in bpffs that are not unlinkable by root
> > in the future, but certainly not for this use case.
>
> Can this not be already done by adding a BPF_LSM program to the
> inode_unlink LSM hook?
>

Also, beside of the inode_unlink... and out of curiosity: making sysfs/bpffs/
readonly after pinning, then using bpf LSM hooks sb_mount|remount|unmount...
family combining bpf() LSM hook... isn't this enough to:
1. Restrict who can pin to bpffs without using a full MAC
2. Restrict who can delete or unmount bpf filesystem

?

-- 
https://djalal.opendz.org/