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Message-ID: <20151006113451.GI28311@example.net>
Date: Tue, 6 Oct 2015 13:34:51 +0200
From: u-uy74@...ey.se
To: musl@...ts.openwall.com
Subject: musl bug or not, real or not? (Was: Update:
pthread_getattr_np() vs explicit runtime) loader
Either nobody cares or nobody has a gcc-5.x toolchain built with musl?
Wondering.
gcc-5 looks like a case important enough to care.
Rune
On Wed, Sep 30, 2015 at 10:35:48PM +0200, u-uy74@...ey.se wrote:
> On Wed, Sep 30, 2015 at 05:43:37PM +0200, u-uy74@...ey.se wrote:
> >
> > I still think that the crashes are caused by errors
> > while guessing the stack placement in pthread_getattr_np(),
> > simply because of the kernel doing something else than usual.
>
> I can reproduce the problem and this looks like something
> to fix or at least work around, either in gcc or in musl.
>
> Running with the implicit loader works, but using the explicit one yields:
>
> ----------------------------------------------------------------
> # cat /proc/sys/kernel/randomize_va_space
> 2
>
> $ /pathtomusllibc.so --library-path /pathtogcc-5libs /pathto/jv-convert --help
> Usage: jv-convert [OPTIONS] [INPUTFILE [OUTPUTFILE]]
>
> Convert from one encoding to another.
>
> --encoding FROM
> --from FROM use FROM as source encoding name
> --to TO use TO as target encoding name
> -i FILE read from FILE
> -o FILE print output to FILE
> --reverse swap FROM and TO encodings
> --help print this help, then exit
> --version print version number, then exit
>
> `-' as a file name argument can be used to refer to stdin or stdout.
>
> # echo 0 > /proc/sys/kernel/randomize_va_space
>
> $ /pathtomusllibc.so --library-path /pathtogcc-5libs /pathto/jv-convert --help
> Segmentation fault
> ----------------------------------------------------------------
>
> Would anybody try this and confirm or refute?
>
> Rune
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