[PATCH] Fix pam_conv in pam_wrapper

Ralph Böhme slow at samba.org
Tue Sep 25 17:33:08 UTC 2018

On Fri, Sep 21, 2018 at 07:08:18PM +0200, Andreas Schneider wrote:
>On Friday, 21 September 2018 18:30:19 CEST Ralph Böhme via samba-technical
>> On Fri, Sep 21, 2018 at 11:11:17AM +0200, Andreas Schneider wrote:
>> >I have a patchset for pam_wrapper to fix the pam conversation and add
>> >support for running with Address Sanitizer.
>> >
>> >
>> >However, the pam_conv fix is important that I can update pam_wrapper to add
>> >tests for some pam_winbind features:
>> >
>> >https://git.samba.org/?p=asn/samba.git;a=shortlog;h=refs/heads/master-pwrap
>> generally looks good, but can you explain the rationale behind the deep-bind
>> patch in the last patch?
>AddressSanitizer detects that we want to do a DEEPBIND so make sure we bind
>with libc an nothing else can interfere.
>==28489==You are trying to dlopen a libc.so.10 shared library with
>RTLD_DEEPBIND flag which is incompatibe with sanitizer runtime (see https://
>github.com/google/sanitizers/issues/611 for details). If you want to run
>libc.so.10 library under sanitizers please remove RTLD_DEEPBIND from dlopen
>However that's exactly what AddressSanitizer wants to do and in order to get
>it working we need to remove the flag. Then you need to preload it before
>socket_wrapper, like this:
>This means if socket_wrapper looks for symbols it will bind those from
>libasan.so.5 instead of the libc.so.

ok, got it. Please push! And sorry for the delay.


Ralph Boehme, Samba Team       https://samba.org/
Samba Developer, SerNet GmbH   https://sernet.de/en/samba/
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