After building uclibc-1.0.31 with AddressSanitizer enabled (gcc7.3 and
8.2), asan complains at runtime that it's not the first library in the
so-list.
With a breakpoint on AsanCheckDynamicRTPrereqs which calls
__dl_iterate_phdr, I see the first module that uClibc returns has
info->libname = "/home/user/myapp", while on glibc-2.27, libname is an
empty string. ASAN depends on seeing this empty string.
Should __dl_iterate_phdr return an empty string here, or is there an
alternative to get asan-enabled uClibc toolchains ?
Thanks.
On 3/14/19 3:01 AM, Petr Vorel wrote:
> Hi Vineet,
>
>> libcpuset.c relies on FTS which is not enabled by default on uClibc.
>> Instead of needing to reconfigure, rebuild uClibc lets disable this test
>> for uClibc
> Which uClibc version are you using?
> Both uClibc and uclibc-ng has it [1] since 2011, version v0.9.32, in commit
> a4aa01c12 ("Added fts support for traversing UNIX file hierarchies.")
Right I'm using bleeding edge as well, and do have the header in sources, its just
not configured/enabled by default hence not available in installation.
> It's actually MUSL, what is missing it [2]. Although there is some
> implementation [3], we should skip it for musl. But the clearest way is really
> to check presence of <fts.h>, that's fix it for all libc.
Spot on, that is indeed the best/ideal way of doing it. Do you know if such a
mechanism already exists in LTP. If you point me to an example I can respin the
patch accordingly.
Thx,
-Vineet
Hi!
I've been having troubles loading a gstreamer plugin for Raspberry Pi
(libgstrpicamsrc.so) on Buildroot with Uclibc-ng 1.0.30.
It seems that some circualr dependencies are preventing the plugin from
loading (specifically libmmal_core.so and libmmal_util.so).
I noticed that GStreamer loads its plugins using RTLD_NOW, but
shouldn't it still be able to handle circular dependencies? The plugin
does load correctly on glibc.
I'm attaching the output of the load using LD_DEBUG. There seem to be a
lot of messages regarding circular dependencies.
There is also a deeper analysis of the issue and how I eventually
worked around it in here:
https://wiki.avner.us/doku.php?id=embedded-web-interaction:uclibc-ng-proble…
Would appreciate any insights,
Thank you!
/Avner
