[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Tue, 6 Oct 2015 13:07:55 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: musl bug or not, real or not? (Was: Update:
pthread_getattr_np() vs explicit runtime) loader
On Tue, Oct 06, 2015 at 01:34:51PM +0200, u-uy74@...ey.se wrote:
> 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.
It's not that I'm uninterested, just that there does not yet seem to
be any reason to believe it's a bug in musl or any easy test-case to
reproduce the problem, so I wouldn't even know where to get started...
I think you really need to find a way to use what debugging tools you
have to figure out what's going on and where the actual source of the
crash is.
Rich
> 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
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
