[Bug libc/13337] New: load_shobj(): Fix readlink() buffer termination handling

["thomas.jarosch at intra2net dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13337

             Bug #: 13337
           Summary: load_shobj(): Fix readlink() buffer termination
                    handling
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: thomas.jarosch@intra2net.com
    Classification: Unclassified


Created attachment 6029
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6029
Patch to fix the issue

>From the patch:

load_shobj(): Fix readlink() buffer termination handling

readlink() never zero terminates the buffer.
load_shobj() calls readlink() like this:

   "if (readlink (origprocname, origlink, PATH_MAX) == -1)"

It tried to compensate for the missing zero termination
with this line of code:

    origlink[PATH_MAX] = '\0';

This is wrong as the content of the 'origlink' buffer
will probably be shorter than PATH_MAX and therefore
contains an unterminated string + garbage.

Fix it by terminating the string properly. Also lower
the buffer size to PATH_MAX, that should be more than enough.

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