Messages in this thread | | | From | David Howells <> | Subject | Re: An actual suggestion (Re: [GIT PULL] Kernel lockdown for secure boot) | Date | Wed, 04 Apr 2018 23:19:27 +0100 |
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Jann Horn <jannh@google.com> wrote:
> > Uh, no. bpf, for example, can be used to modify kernel memory. > > I'm pretty sure bpf isn't supposed to be able to modify arbitrary > kernel memory. AFAIU if you can use BPF to write to arbitrary kernel > memory, that's a bug; with CAP_SYS_ADMIN, you can read from userspace, > write to userspace, and read from kernelspace, but you shouldn't be > able to write to kernelspace.
Ah - you may be right. I seem to have misremembered what Joey Lee wrote in his patch description.
David
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