From 0479b305c5b7c8e3fa8e3002982cf8cac02b842e Mon Sep 17 00:00:00 2001 From: Andreas Schwab Date: Fri, 22 Jun 2012 11:10:31 -0700 Subject: Fix invalid memory access in do_lookup_x. [BZ #13579] Do not free l_initfini and allow it to be reused on subsequent dl_open calls for the same library. This fixes the invalid memory access in do_lookup_x when the previously free'd l_initfini was accessed through l_searchlist when a library had been opened for the second time. --- elf/dl-close.c | 15 +++------------ elf/dl-deps.c | 7 ++++--- elf/dl-libc.c | 9 ++++++--- elf/rtld.c | 2 ++ 4 files changed, 15 insertions(+), 18 deletions(-) (limited to 'elf') diff --git a/elf/dl-close.c b/elf/dl-close.c index d232294665..a250ea5e3e 100644 --- a/elf/dl-close.c +++ b/elf/dl-close.c @@ -1,5 +1,5 @@ /* Close a shared object opened by `_dl_open'. - Copyright (C) 1996-2007, 2009, 2010, 2011 Free Software Foundation, Inc. + Copyright (C) 1996-2012 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -118,17 +118,8 @@ _dl_close_worker (struct link_map *map) if (map->l_direct_opencount > 0 || map->l_type != lt_loaded || dl_close_state != not_pending) { - if (map->l_direct_opencount == 0) - { - if (map->l_type == lt_loaded) - dl_close_state = rerun; - else if (map->l_type == lt_library) - { - struct link_map **oldp = map->l_initfini; - map->l_initfini = map->l_orig_initfini; - _dl_scope_free (oldp); - } - } + if (map->l_direct_opencount == 0 && map->l_type == lt_loaded) + dl_close_state = rerun; /* There are still references to this object. Do nothing more. */ if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0)) diff --git a/elf/dl-deps.c b/elf/dl-deps.c index 69aec461fb..2ae496d7b5 100644 --- a/elf/dl-deps.c +++ b/elf/dl-deps.c @@ -1,6 +1,5 @@ /* Load the dependencies of a mapped object. - Copyright (C) 1996-2003, 2004-2007, 2010-2012 - Free Software Foundation, Inc. + Copyright (C) 1996-2012 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -488,6 +487,7 @@ _dl_map_object_deps (struct link_map *map, nneeded * sizeof needed[0]); atomic_write_barrier (); l->l_initfini = l_initfini; + l->l_free_initfini = 1; } /* If we have no auxiliary objects just go on to the next map. */ @@ -688,6 +688,7 @@ Filters not supported with LD_TRACE_PRELINKING")); l_initfini[nlist] = NULL; atomic_write_barrier (); map->l_initfini = l_initfini; + map->l_free_initfini = 1; if (l_reldeps != NULL) { atomic_write_barrier (); @@ -696,7 +697,7 @@ Filters not supported with LD_TRACE_PRELINKING")); _dl_scope_free (old_l_reldeps); } if (old_l_initfini != NULL) - map->l_orig_initfini = old_l_initfini; + _dl_scope_free (old_l_initfini); if (errno_reason) _dl_signal_error (errno_reason == -1 ? 0 : errno_reason, objname, diff --git a/elf/dl-libc.c b/elf/dl-libc.c index a58e2164f6..af2e663737 100644 --- a/elf/dl-libc.c +++ b/elf/dl-libc.c @@ -1,6 +1,5 @@ /* Handle loading and unloading shared objects for internal libc purposes. - Copyright (C) 1999-2002,2004-2006,2009,2010,2011 - Free Software Foundation, Inc. + Copyright (C) 1999-2012 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Zack Weinberg , 1999. @@ -269,13 +268,13 @@ libc_freeres_fn (free_mem) for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns) { - /* Remove all additional names added to the objects. */ for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next) { struct libname_list *lnp = l->l_libname->next; l->l_libname->next = NULL; + /* Remove all additional names added to the objects. */ while (lnp != NULL) { struct libname_list *old = lnp; @@ -283,6 +282,10 @@ libc_freeres_fn (free_mem) if (! old->dont_free) free (old); } + + /* Free the initfini dependency list. */ + if (l->l_free_initfini) + free (l->l_initfini); } if (__builtin_expect (GL(dl_ns)[ns]._ns_global_scope_alloc, 0) != 0 diff --git a/elf/rtld.c b/elf/rtld.c index a5b0ab9815..6bcf224c49 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -2292,6 +2292,8 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n", lnp->dont_free = 1; lnp = lnp->next; } + /* Also allocated with the fake malloc(). */ + l->l_free_initfini = 0; if (l != &GL(dl_rtld_map)) _dl_relocate_object (l, l->l_scope, GLRO(dl_lazy) ? RTLD_LAZY : 0, -- cgit v1.2.1