GNU bug report logs - #21056
[BUG] Bug with dirname on Ubuntu

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From: Vinh Nguyen <vnguyen <at> opswat.com>
To: 21056 <at> debbugs.gnu.org
Cc: Dave Patt <dpatt <at> opswat.com>
Subject: bug#21056: [BUG] Bug with dirname on Ubuntu
Date: Tue, 14 Jul 2015 09:04:44 +0000

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Dear Sir/Madam,
I've found a bug with dirname function on Ubuntu 14.04 LTS. The context is:
        Dl_info info;
        if ( dladdr( ( const void* )function_to_get_address, &info ) == 0 )
            return false;
        if ( info.dli_fname == NULL )
            return false;
        dirname((char*)info.dli_fname); (1)

With info.dli_fname contains "./libabc.so". Before (1) is invoked, "info shared" command on gdb 7.1 shows no problem, but after invoking (1), "info shared" shows "." in Shared Object Library column and "No" in Sym column. After that, all "dlopen" functions failed with error "Error while mapping shared library sections" and some libraries throw Segmentation Fault exception. So, I think it is a bug of dirname function.
I hope this information is helpful. I'm looking forward to seeing a fix for this.

Sincerely,
Vinh T. Nguyen

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