From: Carlos O'Donell <carlos@redhat.com>
To: Andreas Schwab <schwab@suse.de>
Cc: GNU C Library <libc-alpha@sourceware.org>,
"Dmitry V. Levin" <ldv@altlinux.org>,
Florian Weimer <fweimer@redhat.com>
Subject: Re: [PATCH] Improve DST handling (Bug 23102, Bug 21942, Bug 18018, Bug, 23259, CVE-2011-0536 ).
Date: Tue, 12 Jun 2018 12:46:00 -0000 [thread overview]
Message-ID: <fd1aee06-54a9-717e-4925-3eef02bb53f4@redhat.com> (raw)
In-Reply-To: <mvmsh5sfolh.fsf@suse.de>
On 06/12/2018 03:31 AM, Andreas Schwab wrote:
> On Jun 11 2018, Carlos O'Donell <carlos@redhat.com> wrote:
>
>> By validating it against the abstract definition of the ELF gABI spec
>> for a DST name it prevents any future caller from accidentally straying
>> outside of that contract without having to make two changes: (1) change
>> the comparison DST and (2) change what we accept in is_dst().
>
> Why would we add any use of is_dst with an invalid DST? That doesn't
> make sense.
An invalid DST would be a mistake. The point is to catch mistakes by
enforcing the rules for valid DSTs.
>> Also I find the code ends up being simpler.
>
> I don't agree. It is overly complex for no reason.
There is a reason. You don't think the reason has any value though,
and that's different. That's also OK.
I'll post a v6 with the validation removed, I appreciate your point
of view. I'll work with Florian to get strncmp usage in place.
Would you be OK with something like this?
/* Is a ${...} input sequence? */
if (input[0] == '{')
{
is_curly = true;
++input;
}
/* Check for matching name, following closing curly brace (if
required), or trailing characters which are part of an
identifier. */
size_t rlen = strlen (ref);
if (strncmp (input, ref, rlen) != 0
|| (is_curly && input[rlen] != '}')
|| ((input[rlen] >= 'A' && input[rlen] <= 'Z')
|| (input[rlen] >= 'a' && input[rlen] <= 'z')
|| (input[rlen] >= '0' && input[rlen] <= '9')
|| (input[rlen] == '_')))
return 0;
if (is_curly)
/* Count the two curly braces. */
return ilen + 2;
else
return ilen;
Cheers,
Carlos.g
next prev parent reply other threads:[~2018-06-12 12:46 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-06 5:03 Carlos O'Donell
2018-06-06 14:01 ` Florian Weimer
2018-06-06 14:55 ` Carlos O'Donell
2018-06-06 14:17 ` Florian Weimer
2018-06-06 15:59 ` Carlos O'Donell
2018-06-06 15:47 ` Andreas Schwab
2018-06-06 16:01 ` Carlos O'Donell
2018-06-06 16:10 ` Carlos O'Donell
2018-06-06 16:31 ` Andreas Schwab
2018-06-06 17:10 ` Carlos O'Donell
2018-06-06 17:28 ` Florian Weimer
2018-06-06 18:49 ` Carlos O'Donell
2018-06-06 18:56 ` Florian Weimer
2018-06-06 20:04 ` Carlos O'Donell
2018-06-07 6:49 ` Andreas Schwab
2018-06-08 2:08 ` Carlos O'Donell
2018-06-11 8:04 ` Andreas Schwab
2018-06-12 3:08 ` Carlos O'Donell
2018-06-12 7:31 ` Andreas Schwab
2018-06-12 12:46 ` Carlos O'Donell [this message]
2018-06-12 13:02 ` Andreas Schwab
2018-06-12 13:03 ` Carlos O'Donell
2018-06-06 20:19 ` Carlos O'Donell
2018-06-07 11:38 ` Florian Weimer
2018-06-08 2:14 ` Carlos O'Donell
2018-06-07 12:16 ` Florian Weimer
2018-06-08 4:15 ` Carlos O'Donell
2018-06-08 5:21 ` Florian Weimer
2018-06-08 5:46 ` Carlos O'Donell
2018-06-08 5:50 ` Carlos O'Donell
2018-06-07 12:43 ` Florian Weimer
2018-06-08 5:37 ` Carlos O'Donell
2018-06-08 5:45 ` [PATCH v4] " Carlos O'Donell
2018-06-08 5:51 ` Florian Weimer
2018-06-08 6:03 ` Carlos O'Donell
2018-06-08 6:25 ` Florian Weimer
2018-06-11 2:55 ` Carlos O'Donell
2018-06-11 7:28 ` Florian Weimer
2018-06-11 14:44 ` Carlos O'Donell
2018-06-12 3:46 ` Carlos O'Donell
2018-06-12 13:08 ` [PATCH v6] " Carlos O'Donell
2018-06-12 13:20 ` Andreas Schwab
2018-06-12 13:23 ` Andreas Schwab
2018-06-12 14:10 ` Carlos O'Donell
2018-06-12 14:34 ` Andreas Schwab
2018-06-12 14:31 ` Florian Weimer
2018-06-12 14:36 ` Carlos O'Donell
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