Re: RFC: fsyscall

[Serge E. Hallyn]

On Wed, Sep 09, 2015 at 06:27:06PM +0100, David Drysdale wrote:
> On Wed, Sep 9, 2015 at 1:25 AM, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
> > Andy Lutomirski <luto@xxxxxxxxxxxxxx> writes:
> > > On Tue, Sep 8, 2015 at 4:07 PM, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
>
> (From this perspective, the limitation that seccomp-bpf programs only
> have access to syscall arguments by-value is actually a help -- the filter
> can't look into user memory, so can't be fooled by having memory
> contents changed underneath it.  Of course, if the eBPF stuff ever
> changes that we should watch out...)

Yup and I'm quite sure I've seen that raised as a reason to refuse
supporting exactly that.
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