[lttng-dev] RFC: Fix crash in dlerror()

[mathieu.desnoyers@efficios.com (Mathieu Desnoyers)]

Patch merged into master as commit:

commit 2594a5b4f2b60642973b4941ee506be41786c4d3
Author: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
Date:   Sat Feb 8 17:12:16 2014 -0500

    Fix: malloc libc instrumentation wrapper
    
    calloc and realloc wrt dlsym and dlerror can trigger segmentation
    faults. Ensure that we fully populate the allocator symbols all at once,
    and also ensure that we use the static allocator while doing the dlsym
    lookups.
    
    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>

Thanks!

Mathieu

----- Original Message -----
> From: "Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>
> To: "Stefan Seefeld" <stefan_seefeld at mentor.com>
> Cc: lttng-dev at lists.lttng.org
> Sent: Wednesday, February 12, 2014 9:35:03 AM
> Subject: Re: [lttng-dev] RFC: Fix crash in dlerror()
> 
> Updated patch, now ensuring that the wrapper is initialized before
> UST starts other threads. It now has a constructor function that will
> take care of initializing the wrapper before other program threads are
> started anyhow.
> 
> I also added a missing lookup check (calloc pointer) within realloc
> (branch handling realloc of a statically allocated pointer).
> 
> Thanks,
> 
> Mathieu
> 
> ----- Original Message -----
> > From: "Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>
> > To: "Stefan Seefeld" <stefan_seefeld at mentor.com>
> > Cc: lttng-dev at lists.lttng.org
> > Sent: Tuesday, February 11, 2014 10:39:55 PM
> > Subject: Re: [lttng-dev] RFC: Fix crash in dlerror()
> > 
> > Updated patch, now with tracepoints in the static allocator.
> > 
> > Review welcome,
> > 
> > Thanks,
> > 
> > Mathieu
> > --
> > Mathieu Desnoyers
> > EfficiOS Inc.
> > http://www.efficios.com
> > 
> > _______________________________________________
> > lttng-dev mailing list
> > lttng-dev at lists.lttng.org
> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> > 
> 
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com
> 
> _______________________________________________
> lttng-dev mailing list
> lttng-dev at lists.lttng.org
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com