From: Michal Nazarewicz <mina86@mina86.com>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>,
Andreas Schwab <schwab@linux-m68k.org>
Cc: libc-alpha@sourceware.org
Subject: Re: [PATCH] linux: sysconf: limit _SC_MAX_ARG to 6 MiB [BZ #25305]
Date: Tue, 13 Apr 2021 21:57:25 +0200 [thread overview]
Message-ID: <05wsjeil807oxrv57bk8g2i3@mina86.com> (raw)
In-Reply-To: <ed2aa039-d22a-8e04-7f7a-858aef18ae7e@linaro.org>
> On 13/04/2021 09:13, Andreas Schwab wrote:
>> In addition, I'd give it a symbolic name with a comment.
On Tue, Apr 13 2021, Adhemerval Zanella wrote:
> What about:
>
> diff --git a/sysdeps/unix/sysv/linux/sysconf.c b/sysdeps/unix/sysv/linux/sysconf.c
> index 366fcef01e..aceedfa87c 100644
> --- a/sysdeps/unix/sysv/linux/sysconf.c
> +++ b/sysdeps/unix/sysv/linux/sysconf.c
> @@ -33,6 +33,9 @@
> actual value varies based on the stack size. */
> #define legacy_ARG_MAX 131072
>
> +/* Newer kernels (4.13) limit the maximum command line arguments lengths to
> + 6MiB. */
> +#define maximum_ARG_MAX 6291456
I’d still go with (6 * 1024 * 1024). Otherwise looks good to me.
> static long int posix_sysconf (int name);
>
> @@ -55,7 +58,10 @@ __sysconf (int name)
> struct rlimit rlimit;
> /* Use getrlimit to get the stack limit. */
> if (__getrlimit (RLIMIT_STACK, &rlimit) == 0)
> - return MAX (legacy_ARG_MAX, rlimit.rlim_cur / 4);
> + {
> + const long int limit = MAX (legacy_ARG_MAX, rlimit.rlim_cur / 4);
> + return MIN (limit, maximum_ARG_MAX);
> + }
>
> return legacy_ARG_MAX;
> }
On Tue, Apr 13 2021, Adhemerval Zanella wrote:
> Alright, I will change it and commit for you.
Thanks.
--
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»
next prev parent reply other threads:[~2021-04-13 19:57 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 15:10 Michal Nazarewicz
2021-04-07 18:36 ` Adhemerval Zanella
2021-04-07 18:41 ` Florian Weimer
2021-04-07 18:52 ` Adhemerval Zanella
2021-04-07 19:04 ` Florian Weimer
2021-04-07 19:34 ` Adhemerval Zanella
2021-04-07 19:36 ` Florian Weimer
2021-04-08 1:49 ` Michal Nazarewicz
2021-04-12 20:59 ` Adhemerval Zanella
2021-04-12 21:31 ` Michal Nazarewicz
2021-04-13 11:53 ` Adhemerval Zanella
2021-04-13 12:13 ` Andreas Schwab
2021-04-13 13:36 ` Adhemerval Zanella
2021-04-13 14:41 ` Andreas Schwab
2021-04-13 14:45 ` Adhemerval Zanella
2021-04-13 19:57 ` Michal Nazarewicz [this message]
2021-04-13 20:47 ` Adhemerval Zanella
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