[Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code

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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
       [not found] <bug-11177-131@http.sourceware.org/bugzilla/>
@ 2014-06-30 20:22 ` fweimer at redhat dot com
  2014-07-01 14:42 ` paul_woegerer at mentor dot com
  2014-07-17 14:48 ` [Bug dynamic-link/11177] " jsm28 at gcc dot gnu.org
  2 siblings, 0 replies; 11+ messages in thread
From: fweimer at redhat dot com @ 2014-06-30 20:22 UTC (permalink / raw)
  To: glibc-bugs

https://sourceware.org/bugzilla/show_bug.cgi?id=11177

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
       [not found] <bug-11177-131@http.sourceware.org/bugzilla/>
  2014-06-30 20:22 ` [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code fweimer at redhat dot com
@ 2014-07-01 14:42 ` paul_woegerer at mentor dot com
  2014-07-17 14:48 ` [Bug dynamic-link/11177] " jsm28 at gcc dot gnu.org
  2 siblings, 0 replies; 11+ messages in thread
From: paul_woegerer at mentor dot com @ 2014-07-01 14:42 UTC (permalink / raw)
  To: glibc-bugs

https://sourceware.org/bugzilla/show_bug.cgi?id=11177

Paul Woegerer <paul_woegerer at mentor dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |paul_woegerer at mentor dot com
         Resolution|WONTFIX                     |---

--- Comment #8 from Paul Woegerer <paul_woegerer at mentor dot com> ---
For lttng-ust we would like to use the la_preinit LD_AUDIT callback to make a
traced application defer the execution of main() until the static constructor
execution that initializes the lttng-ust framework has completed.

For this to be practical and end-user friendly we would need LD_AUDIT to be
more robust. Nowadays many applications are linked against libicu and for all
those the la_preinit approach is currently not usable due to this bug. Also
rebuilding shared libraries that cause problems in the context of LD_AUDIT as
suggested in comment_#6 is often not practical.

It would be great if someone could look again into this issue and see if it
would be feasible to solve this problem for once and all.

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* [Bug dynamic-link/11177] LD_AUDIT doesn't work with shared libraries containing no code
       [not found] <bug-11177-131@http.sourceware.org/bugzilla/>
  2014-06-30 20:22 ` [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code fweimer at redhat dot com
  2014-07-01 14:42 ` paul_woegerer at mentor dot com
@ 2014-07-17 14:48 ` jsm28 at gcc dot gnu.org
  2 siblings, 0 replies; 11+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2014-07-17 14:48 UTC (permalink / raw)
  To: glibc-bugs

https://sourceware.org/bugzilla/show_bug.cgi?id=11177

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|libc                        |dynamic-link

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* [Bug libc/11177] New: LD_AUDIT doesn't work with shared libraries containing no code
@ 2010-01-15 11:04 andris dot zeila at accenture dot com
  2010-01-15 11:05 ` [Bug libc/11177] " andris dot zeila at accenture dot com
                   ` (7 more replies)
  0 siblings, 8 replies; 11+ messages in thread
From: andris dot zeila at accenture dot com @ 2010-01-15 11:04 UTC (permalink / raw)
  To: glibc-bugs

Preface:
This issue comes from latrace inability to trace applications built with ICU
library for unicode support.

Steps to repeat:
1) compile the attached audit library: gcc libaudittest.c -o libaudittest.so
--shared
2) compile the attached sample application: gcc audittest.c -o audittest
$(icu-config --ldflags)
3) run the resulting application with audit enabled:
LD_AUDIT=$(pwd)/libaudittest.so ./audittest

Result:
../audittest: no PLTREL found in object /usr/lib/libicudata.so.40

While running just ./audittest works normally.

Apparently lbicudata is ICU data only library without any code segments, which
confuses glibc.

-- 
           Summary: LD_AUDIT doesn't work with shared libraries containing
                    no code
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: andris dot zeila at accenture dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11177

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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
  2010-01-15 11:04 [Bug libc/11177] New: " andris dot zeila at accenture dot com
@ 2010-01-15 11:05 ` andris dot zeila at accenture dot com
  2010-01-15 11:05 ` andris dot zeila at accenture dot com
                   ` (6 subsequent siblings)
  7 siblings, 0 replies; 11+ messages in thread
From: andris dot zeila at accenture dot com @ 2010-01-15 11:05 UTC (permalink / raw)
  To: glibc-bugs


------- Additional Comments From andris dot zeila at accenture dot com  2010-01-15 11:05 -------
Created an attachment (id=4521)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=4521&action=view)
Sample application


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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
  2010-01-15 11:04 [Bug libc/11177] New: " andris dot zeila at accenture dot com
  2010-01-15 11:05 ` [Bug libc/11177] " andris dot zeila at accenture dot com
@ 2010-01-15 11:05 ` andris dot zeila at accenture dot com
  2010-01-15 12:27 ` kirill at shutemov dot name
                   ` (5 subsequent siblings)
  7 siblings, 0 replies; 11+ messages in thread
From: andris dot zeila at accenture dot com @ 2010-01-15 11:05 UTC (permalink / raw)
  To: glibc-bugs


------- Additional Comments From andris dot zeila at accenture dot com  2010-01-15 11:05 -------
Created an attachment (id=4520)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=4520&action=view)
Sample audit library


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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
  2010-01-15 11:04 [Bug libc/11177] New: " andris dot zeila at accenture dot com
  2010-01-15 11:05 ` [Bug libc/11177] " andris dot zeila at accenture dot com
  2010-01-15 11:05 ` andris dot zeila at accenture dot com
@ 2010-01-15 12:27 ` kirill at shutemov dot name
  2010-01-20  2:04 ` drepper at redhat dot com
                   ` (4 subsequent siblings)
  7 siblings, 0 replies; 11+ messages in thread
From: kirill at shutemov dot name @ 2010-01-15 12:27 UTC (permalink / raw)
  To: glibc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kirill at shutemov dot name


http://sourceware.org/bugzilla/show_bug.cgi?id=11177

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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
  2010-01-15 11:04 [Bug libc/11177] New: " andris dot zeila at accenture dot com
                   ` (2 preceding siblings ...)
  2010-01-15 12:27 ` kirill at shutemov dot name
@ 2010-01-20  2:04 ` drepper at redhat dot com
  2010-01-21 15:23 ` eero dot tamminen at nokia dot com
                   ` (3 subsequent siblings)
  7 siblings, 0 replies; 11+ messages in thread
From: drepper at redhat dot com @ 2010-01-20  2:04 UTC (permalink / raw)
  To: glibc-bugs


------- Additional Comments From drepper at redhat dot com  2010-01-20 02:04 -------
The /usr/lib/libicudata.so.40 is miscompiled.  I don't see this in the version
on my machine and it should never happen.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX


http://sourceware.org/bugzilla/show_bug.cgi?id=11177

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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
  2010-01-15 11:04 [Bug libc/11177] New: " andris dot zeila at accenture dot com
                   ` (3 preceding siblings ...)
  2010-01-20  2:04 ` drepper at redhat dot com
@ 2010-01-21 15:23 ` eero dot tamminen at nokia dot com
  2010-01-27  9:37 ` eero dot tamminen at nokia dot com
                   ` (2 subsequent siblings)
  7 siblings, 0 replies; 11+ messages in thread
From: eero dot tamminen at nokia dot com @ 2010-01-21 15:23 UTC (permalink / raw)
  To: glibc-bugs


------- Additional Comments From eero dot tamminen at nokia dot com  2010-01-21 15:23 -------
Created an attachment (id=4548)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=4548&action=view)
readelf -S /usr/lib/libicudata.so.38.1 (Debian Stable)

(In reply to comment #3)
> The /usr/lib/libicudata.so.40 is miscompiled.

Attached is the output of "readelf -S /usr/lib/libicudata.so.38.1" from Debian
stable and it definitely doesn't have a text section.  Here are its sources and
packaging:
  http://packages.debian.org/lenny/libicu38

There are no bug reports on Debian about building libicudata:
  http://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=libicu38;dist=stable


> I don't see this in the version on my machine and it should never happen.

What sections you have in that library on RedHat?


And anyway...  LD_AUDIT asserting on something that the dynamic linker accepts
sounds dubious.  Either the dynamic linker should assert already on linking
this kind of a library or LD_AUDIT should only give a warning.


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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
  2010-01-15 11:04 [Bug libc/11177] New: " andris dot zeila at accenture dot com
                   ` (4 preceding siblings ...)
  2010-01-21 15:23 ` eero dot tamminen at nokia dot com
@ 2010-01-27  9:37 ` eero dot tamminen at nokia dot com
  2010-01-28  8:17 ` drepper at redhat dot com
  2010-02-08  9:03 ` eero dot tamminen at nokia dot com
  7 siblings, 0 replies; 11+ messages in thread
From: eero dot tamminen at nokia dot com @ 2010-01-27  9:37 UTC (permalink / raw)
  To: glibc-bugs


------- Additional Comments From eero dot tamminen at nokia dot com  2010-01-27 09:37 -------
> The /usr/lib/libicudata.so.40 is miscompiled.  I don't see this in
> the version on my machine and it should never happen.

But it's still valid ELF object, isn't it?

Either dynamic linker should reject linking such libraries or LD_AUDIT should
accept them.

Re-opening.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WONTFIX                     |


http://sourceware.org/bugzilla/show_bug.cgi?id=11177

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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
  2010-01-15 11:04 [Bug libc/11177] New: " andris dot zeila at accenture dot com
                   ` (5 preceding siblings ...)
  2010-01-27  9:37 ` eero dot tamminen at nokia dot com
@ 2010-01-28  8:17 ` drepper at redhat dot com
  2010-02-08  9:03 ` eero dot tamminen at nokia dot com
  7 siblings, 0 replies; 11+ messages in thread
From: drepper at redhat dot com @ 2010-01-28  8:17 UTC (permalink / raw)
  To: glibc-bugs


------- Additional Comments From drepper at redhat dot com  2010-01-28 08:17 -------
(In reply to comment #5)
> Either dynamic linker should reject linking such libraries or LD_AUDIT should
> accept them.

That's nonsense.  There are simply different requirements.  Just fix the DSOs
and be done with it.  The fact that whatever tests the debian system performs
aren't showing problems doesn't mean anything.  Special casing just creates
problems.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |WONTFIX


http://sourceware.org/bugzilla/show_bug.cgi?id=11177

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* [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code
  2010-01-15 11:04 [Bug libc/11177] New: " andris dot zeila at accenture dot com
                   ` (6 preceding siblings ...)
  2010-01-28  8:17 ` drepper at redhat dot com
@ 2010-02-08  9:03 ` eero dot tamminen at nokia dot com
  7 siblings, 0 replies; 11+ messages in thread
From: eero dot tamminen at nokia dot com @ 2010-02-08  9:03 UTC (permalink / raw)
  To: glibc-bugs


------- Additional Comments From eero dot tamminen at nokia dot com  2010-02-08 09:03 -------
(In reply to comment #6)
> Just fix the DSOs and be done with it.

Same issue on SUSE.

RedHat package seems to be patching libicudata by sed'ing -nostdlib etc away:
  sed -i -- "s/-nodefaultlibs -nostdlib//" config/mh-linux

Which increases lib size by 1.5kB which is acceptable.

I hope your change gets propagated to upstream libicudata if it's not already
reported there (trac is pretty awful as bug database from the search
perspective, but on quick search I didn't find anything about this:
http://bugs.icu-project.org/trac/).


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end of thread, other threads:[~2014-07-17 14:48 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
     [not found] <bug-11177-131@http.sourceware.org/bugzilla/>
2014-06-30 20:22 ` [Bug libc/11177] LD_AUDIT doesn't work with shared libraries containing no code fweimer at redhat dot com
2014-07-01 14:42 ` paul_woegerer at mentor dot com
2014-07-17 14:48 ` [Bug dynamic-link/11177] " jsm28 at gcc dot gnu.org
2010-01-15 11:04 [Bug libc/11177] New: " andris dot zeila at accenture dot com
2010-01-15 11:05 ` [Bug libc/11177] " andris dot zeila at accenture dot com
2010-01-15 11:05 ` andris dot zeila at accenture dot com
2010-01-15 12:27 ` kirill at shutemov dot name
2010-01-20  2:04 ` drepper at redhat dot com
2010-01-21 15:23 ` eero dot tamminen at nokia dot com
2010-01-27  9:37 ` eero dot tamminen at nokia dot com
2010-01-28  8:17 ` drepper at redhat dot com
2010-02-08  9:03 ` eero dot tamminen at nokia dot com

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