linux-kernel - Re: [PATCH 6.4 00/28] 6.4.1-rc1 review

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Message-ID: <CAHk-=wiHs1cL2Fb90NXVhtQsMuu+OLHB4rSDsPVe0ALmbvZXZQ@mail.gmail.com>
Date:   Sun, 2 Jul 2023 15:45:34 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Helge Deller <deller@....de>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, linux@...ck-us.net,
        linux-parisc <linux-parisc@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        John David Anglin <dave.anglin@...l.net>
Subject: Re: [PATCH 6.4 00/28] 6.4.1-rc1 review - hppa argument list too long

On Sun, 2 Jul 2023 at 14:33, Helge Deller <deller@....de> wrote:
>
> Actually, your changes seems to trigger...:
>
> root@...ian:~# /usr/bin/ls /usr/bin/*
> -bash: /usr/bin/ls: Argument list too long

So this only happens with _fairly_ long argument lists, right? Maybe
your config has a 64kB page size, and normal programs never expand
beyond a single page?

I bet it is because of f313c51d26aa ("execve: expand new process stack
manually ahead of time"), but I don't see exactly why.

But pa-risc is the only architecture with CONFIG_STACK_GROWSUP, and
while I really thought that commit should do the exact same thing as
the old

  #ifdef CONFIG_STACK_GROWSUP

special case, I must clearly have been wrong.

Would you mind just verifying that yes, that commit on mainline is
broken for you, and the previous one works?

               Linus