Re: Crash when attaching uretprobes to processes running in Docker

Andrii Nakryiko
2025-01-15T18:20:49Z

On Wed, Jan 15, 2025 at 9:56 AM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
> On Wed, Jan 15, 2025 at 7:06 AM Oleg Nesterov <oleg@redhat.com> wrote:
> >
> > Or we can change __secure_computing() to do nothing if
> > this_syscall == __NR_uretprobe.
>
> I think that's the best way forward.
> seccomp already allowlists sigreturn syscall.
> uretprobe syscall is in the same category.

+1, we will have a similar problem with sys_uprobe (when it's added).
Just like rt_sigreturn, these are special kernel-only mechanisms, and
the kernel already protects itself from any user abuse. So I think we
should have a way to ensure those special syscalls can go through
regardless of seccomp.

> See __secure_computing_strict.