From: Charlotte Delenk <darkkirb@darkkirb.de>
To: musl@lists.openwall.com
Subject: Re: [musl] [PATCH] Add support for LLVM's Control Flow Integrity (V2)
Date: Tue, 29 Dec 2020 11:20:41 +0100 [thread overview]
Message-ID: <104266ac-6da3-0fac-2394-54dca6675270@darkkirb.de> (raw)
In-Reply-To: <F4C8EA33-9721-47A5-BEC6-5A29A7072989@shiz.me>
On 12/28/20 6:01 PM, Shiz wrote:
> Hi,
>
> It seems to me guarding all of those with #ifdef __clang__ is not the optimal approach.
> What if another compilers decides to pick up the spec, or an older non-CFI
> Clang is used to compile? I think it's more logical to check the no_sanitize attribute
> with a functional test (like __has_attribute),
As Rich Felker wrote in an email i haven't yet received in my mailbox,
he thinks it's better to put the exceptions in the Makefile. I'm going
to update the patch accordingly (and split in two, one for GCC and LLVM
LTO fixes and one for CFI)
> and to just apply the used attribute unconditionally.
The used attribute is a workaround for a LLVM bug that has existed for
quite some time. GCC does not have a problem with the functions marked
used, but instead requires _dlstart_c to be marked as such.
>
> - Shiz
>
next prev parent reply other threads:[~2020-12-29 10:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-27 17:53 [musl] [PATCH] Add support for LLVM's Control Flow Integrity Charlotte Delenk
2020-12-27 23:05 ` Fangrui Song
2020-12-28 0:56 ` Fangrui Song
2020-12-28 9:20 ` Charlotte Delenk
2020-12-28 13:17 ` [musl] [PATCH] Add support for LLVM's Control Flow Integrity (V2) Charlotte Delenk
2020-12-28 17:01 ` Shiz
2020-12-29 1:26 ` Rich Felker
2020-12-29 10:20 ` Charlotte Delenk [this message]
2020-12-29 11:56 ` [musl] [PATCH 1/2] Fix LTO shared library build on GCC and Clang Charlotte Delenk
2020-12-29 11:59 ` [musl] [PATCH 2/2] Add support for LLVM's Control Flow Integrity Charlotte Delenk
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