[Bug libc/13515] New: pthread_getname_np(th_id, ...) return weird result when called by another thread than [th_id]

[Bug libc/13515] New: pthread_getname_np(th_id, ...) return weird result when called by another thread than [th_id]

[misterwallas at yahoo dot fr]

http://sourceware.org/bugzilla/show_bug.cgi?id=13515

             Bug #: 13515
           Summary: pthread_getname_np(th_id, ...) return weird result
                    when called by another thread than [th_id]
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: misterwallas@yahoo.fr
    Classification: Unclassified


Created attachment 6116
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6116
[pthread_getname_np] test program

When pthread_getname_np(th_id, ...) is called from the thread [th_id] the
result is fine. When called from another thread the result is "right padded" by
weird characters (often '\n' but others in general).

Find a simple test program in attachement.

Regards

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[Bug libc/13515] pthread_getname_np(th_id, ...) return weird result when called by another thread than [th_id]

[drepper.fsp at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13515

Ulrich Drepper <drepper.fsp at gmail dot com> changed:

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

--- Comment #1 from Ulrich Drepper <drepper.fsp at gmail dot com> 2011-12-22 00:27:00 UTC ---
I checked in a patch.

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[Bug libc/13515] pthread_getname_np(th_id, ...) return weird result when called by another thread than [th_id]

[misterwallas at yahoo dot fr]

http://sourceware.org/bugzilla/show_bug.cgi?id=13515

--- Comment #2 from misterwallas at yahoo dot fr 2011-12-22 10:05:59 UTC ---
Hi Ulrich,

Thanks for the patch.

Just few questions - I may be wrong because I could not find any documentation
on the [read_not_cancel] function.

My questions:

1) In the case of [read_not_cancel] return zero (n == 0) would the statement
buf[n - 1] = '\0' cause an access violation?

2) It seems that the problem is that [read_not_cancel] return an "unwanted"
'\n' also could it be another "unwanted" char?

Anyway, thanks again.

==================================================================
   ssize_t n = TEMP_FAILURE_RETRY (read_not_cancel (fd, buf, len));
   if (n < 0)
     res = errno;
+  else
+    {
+      if (buf[n - 1] == '\n')
+       buf[n - 1] = '\0';
+      else if (n == len)
+       res = ERANGE;
+      else
+       buf[n] = '\0';
+    }

   close_not_cancel_no_status (fd);
==================================================================

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[Bug libc/13515] pthread_getname_np(th_id, ...) return weird result when called by another thread than [th_id]

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13515

Florian Weimer <fweimer at redhat dot com> changed:

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

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