On Fri, Sep 25, 2020 at 02:15:50AM +0200, Jann Horn wrote: > On Fri, Sep 25, 2020 at 2:01 AM Kees Cook <keescook@xxxxxxxxxxxx> wrote: > > 2) seccomp needs to handle "multiplexed" tables like x86_x32 (distros > > haven't removed CONFIG_X86_X32 widely yet, so it is a reality that > > it must be dealt with), which means seccomp's idea of the arch > > "number" can't be the same as the AUDIT_ARCH. > > Sure, distros ship it; but basically nobody uses it, it doesn't have > to be fast. As long as we don't *break* it, everything's fine. And if > we ignore the existence of X32 in the fastpath, that'll just mean that > syscalls with the X32 marker bit always hit the seccomp slowpath > (because it'll look like the syscall number is out-of-bounds ) - no > problem. You do realize that X32 is amd64 counterpart of mips n32, right? And that's not "basically nobody uses it"...
