linux-kernel - Re: [PATCH] ld-version: fix it on Fedora

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 07 Jan 2016 16:42:24 -0200
From:	Alexandre Oliva <oliva@....org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Michal Marek <mmarek@...e.com>,
	linux-kbuild@...r.kernel.org, linux-mips@...ux-mips.org,
	ralf@...ux-mips.org
Subject: Re: [PATCH] ld-version: fix it on Fedora

On Jan  7, 2016, "Michael S. Tsirkin" <mst@...hat.com> wrote:

> On Fedora 23, ld --version outputs:
> GNU ld version 2.25-15.fc23

> But ld-version.sh fails to parse this

On gnewsense 3, ld --version outputs:

GNU ld (GNU Binutils for Debian) 2.20.1-system.20100303
Copyright [...]

The date at the end severely confuses the version parser.

Furthermore, awk is mawk, whose gsub takes ')' as grouping, so it
complains about the missing '('.

Also, once a[1] is multiplied by 1e7, mawk's print spits out the number
in exponential notation, which confuses the -lt test.  In order to avoid
that falling back to floating-point numbers, I've used smaller
multipliers and concatenated (truncated) integers.  Yuck.

I've modified the script so that it takes the - as a separator too, and
so that it works on both gawk and mawk.  Here's the ld-version.sh that
worked for me.  I guess this will have to be combined with your patch
somehow.

#!/usr/bin/awk -f
# extract linker version number from stdin and turn into single number
        {
        gsub(".*[)]", "");
        split($1,a, "[-.]");
        printf "%i%04i\n", a[1]*10000 + a[2]*100 + a[3], (a[4]*100 + a[5])%10000;
        exit
        }

-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/   FSF Latin America board member
Free Software Evangelist|Red Hat Brasil GNU Toolchain Engineer