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Date: Fri, 17 Jul 2009 19:06:00 -0000
From: "azzie at astronet dot pl" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Message-ID: <20090717190615.10411.azzie@astronet.pl>
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Subject: [Bug libc/10411] New: Segfault with non-existent directory in LD_LIBRARY_PATH
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By mistake I put a non-existent path in my LD_LIBRARY_PATH. To my surprise
display (ImageMagick program) crashed with segmentation fault after the change.
Debugging with valgrind and gdb leads to elf/dl-load.c:1943 in open_path() which
contains the following line:

sps->dirs = (void *) -1;

Can sps->dirs be changed when it comes from the environment? For the segfault
the open_path() is invoked as follows:

fd = open_path (name, namelen, preloaded, &env_path_list,
                &realname, &fb,
                loader ?: GL(dl_ns)[LM_ID_BASE]._ns_loaded,
                LA_SER_LIBPATH, &found_other_class);

Backtrace:

==24674==  Bad permissions for mapped region at address 0x421CDF0
==24674==    at 0x4005E52: open_path (dl-load.c:1943)
==24674==    by 0x4007B00: _dl_map_object (dl-load.c:2079)
==24674==    by 0x4011950: dl_open_worker (dl-open.c:289)
==24674==    by 0x400D3D5: _dl_catch_error (dl-error.c:178)
==24674==    by 0x40112EA: _dl_open (dl-open.c:616)
==24674==    by 0x7A45F7A: dlopen_doit (dlopen.c:67)
==24674==    by 0x400D3D5: _dl_catch_error (dl-error.c:178)
==24674==    by 0x7A4632B: _dlerror_run (dlerror.c:164)
==24674==    by 0x7A45EE0: dlopen@@GLIBC_2.2.5 (dlopen.c:88)
==24674==    by 0x4FAF559: vm_open (dlopen.c:194)
==24674==    by 0x4FAD376: tryall_dlopen (ltdl.c:434)
==24674==    by 0x4FADE43: try_dlopen (ltdl.c:532)

-- 
           Summary: Segfault with non-existent directory in LD_LIBRARY_PATH
           Product: glibc
           Version: 2.10
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: azzie at astronet dot pl
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=10411

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