From: Florian Weimer <fweimer@redhat.com>
To: Siddhesh Poyarekar via Libc-alpha <libc-alpha@sourceware.org>
Cc: Siddhesh Poyarekar <siddhesh@sourceware.org>, jakub@redhat.com
Subject: Re: [PATCH v2 1/2] string: _FORTIFY_SOURCE=3 using __builtin_dynamic_object_size
Date: Mon, 14 Dec 2020 16:34:44 +0100 [thread overview]
Message-ID: <87ft48bduz.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <6d817d21-cddf-f270-93c1-1c603d1198af@sourceware.org> (Siddhesh Poyarekar via Libc-alpha's message of "Mon, 14 Dec 2020 20:39:24 +0530")
* Siddhesh Poyarekar via Libc-alpha:
> On 12/14/20 8:24 PM, Florian Weimer via Libc-alpha wrote:
>> * Siddhesh Poyarekar via Libc-alpha:
>>
>>> diff --git a/NEWS b/NEWS
>>> index 0820984547..4167f34c13 100644
>>> --- a/NEWS
>>> +++ b/NEWS
>>> @@ -28,6 +28,11 @@ Major new features:
>>> The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
>>> 2.28.
>>> +* A new fortification level _FORTIFY_SOURCE=3 is available. At
>>> this level,
>>> + glibc may use additional checks that may be computationally expensive. At
>>> + present these checks are available only on LLVM 9 and later. The latest GCC
>>> + available at this time (10.2) does not support this level of fortification.
>> I think it's still a fixed overhead per call (i.e., not proportional
>> to
>> buffer size or stack depth). So the performance warning is perhaps a
>> bit too strong (likewise in the manual).
>
> How about:
>
> s/be computationally expensive/have a performance overhead/ ?
>
> I agree with Jakub that it's not fixed but I also agree that there's
> scope to soften "computationally expensive".
“have an additional performance overhead”?
Thanks,
Florian
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next prev parent reply other threads:[~2020-12-14 15:34 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-10 18:13 [PATCH 0/2] _FORTIFY_SOURCE=3 Siddhesh Poyarekar
2020-12-10 18:13 ` [PATCH 1/2] string: _FORTIFY_SOURCE=3 using __builtin_dynamic_object_size Siddhesh Poyarekar
2020-12-10 19:10 ` Paul Eggert
2020-12-11 1:36 ` Siddhesh Poyarekar
2020-12-11 2:42 ` Paul Eggert
2020-12-14 5:23 ` [PATCH v2 " Siddhesh Poyarekar
2020-12-14 14:54 ` Florian Weimer
2020-12-14 15:02 ` Jakub Jelinek
2020-12-14 15:09 ` Siddhesh Poyarekar
2020-12-14 15:34 ` Florian Weimer [this message]
2020-12-14 15:47 ` Andreas Schwab
2020-12-14 15:52 ` Florian Weimer
2020-12-14 17:41 ` [PATCH v3 " Siddhesh Poyarekar
2020-12-10 18:13 ` [PATCH 2/2] nonstring: " Siddhesh Poyarekar
2020-12-15 11:28 ` Florian Weimer
2020-12-15 11:33 ` Jakub Jelinek
2020-12-15 12:00 ` Siddhesh Poyarekar
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