Date: Mon, 17 Apr 2006 18:03:46 -0400 From: Joe Marcus Clarke <marcus@FreeBSD.org> To: Pascal Hofstee <caelian@gmail.com> Cc: gnome@FreeBSD.org Subject: Re: gnome-session [mc-gnome] on amd64 problems. Message-ID: <444410C2.8040907@FreeBSD.org> In-Reply-To: <d8a0b7620604171445h5d5b4b8bnfd6577dcc0cdfb12@mail.gmail.com> References: <d8a0b7620604171445h5d5b4b8bnfd6577dcc0cdfb12@mail.gmail.com>
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Pascal Hofstee wrote:
> Hi,
>
> It looks like i stumbled across some pointer-truncation in the current
> MC-gnome gnome-session port on amd64.
> I'll try to outline the problem as i understand it below .. any assistence
> here would be appreciated.
>
> in ${WORKDIR}/gnome-session/gsm-xrandr.c there's a function called
> "gsm_set_display_properties"
> at line 134 the following call get's made:
>
> client = gsm_get_conf_client ();
>
> client is defined in the function definition as GConfClient *client;
> (this definition is inside an #ifdef HAVE_RANDR .. i have tried moving it
> outside the ifdef to no avail though).
>
> I have stepped through the gsm_get_conf_client() call in a gdb session ..
> and everything seems to be alright including the function's return call. The
> function tries to return a valid 64-bit pointer.
>
> However .. immediately after the assignment has been done. client now points
> to a (truncated) 32-bit address.
> This obviously causes a problem whenever client is used to get any gconf
> data, which in turn causes gnome-session to segfault.
> My first guess is that somehow the storagesize/datatype for GConfClient is
> being obscured causing the compiler to default it to a 32bit integer, which
> would explain the sudden pointer truncation upon assignment.
>
> I currently do not have an actual backtrace available .. as i am not writing
> this on my FreeBSD system.
>
>
> If anybody has any idea why the pointer gets truncated to 32bit in this
> case, please enlighten me so i can try to test potential fixes.
Fixed.
Joe
- --
Joe Marcus Clarke
FreeBSD GNOME Team :: gnome@FreeBSD.org
FreeNode / #freebsd-gnome
http://www.FreeBSD.org/gnome
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