linux-kernel - Re: [PATCH] exitz syscall

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Message-ID: <CAHk-=whTZDjeH2FJqBozjAF44sh4XVNQrt2xdQn_Ujt=Be6=dw@mail.gmail.com>
Date:   Sat, 11 Nov 2023 17:24:00 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Willy Tarreau <w@....eu>
Cc:     York Jasper Niebuhr <yjnworkstation@...il.com>,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] exitz syscall

On Sat, 11 Nov 2023 at 05:24, Willy Tarreau <w@....eu> wrote:
>
> IMHO it does not make sense to add a syscall for this, please have a
> look at prctl(2) instead, which is already used for similar settings.

Honestly, I don't think it makes any sense at all.

If the key manager people can't be bothered to keep track of their
keys, the kernel certainly shouldn't be bothered with this kind of
huge hammer.

It looks like an active DoS attack to me, by anybody who just creates
a huge process and then sits there giggling as the machine comes to a
complete halt, with the kernel busy zeroing pointless crap.

Do it in user space. And if your user space randomly crashes, you have
other problems - but you can try to use ptrace to catch even that case
if you care.

          Linus