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* elf/do-lookup.h (do_lookup_x): Read r_nlist before r_list and

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make sure gcc doesn't mess around with this.
This commit is contained in:
Ulrich Drepper 2007-06-09 19:45:57 +00:00
parent 3c45708967
commit 90cd2413df
2 changed files with 12 additions and 2 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2007-06-09 Ulrich Drepper <drepper@redhat.com>
* elf/do-lookup.h (do_lookup_x): Read r_nlist before r_list and
make sure gcc doesn't mess around with this.
2007-06-08 Ulrich Drepper <drepper@redhat.com>
* elf/dl-lookup.c (_dl_lookup_symbol_x): Remove use of r_nlist.

9
elf/do-lookup.h
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@ -1,5 +1,5 @@
/* Look up a symbol in the loaded objects.
Copyright (C) 1995-2004, 2005, 2006 Free Software Foundation, Inc.
Copyright (C) 1995-2004, 2005, 2006, 2007 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
@ -29,8 +29,13 @@ do_lookup_x (const char *undef_name, uint_fast32_t new_hash,
const struct r_found_version *const version, int flags,
struct link_map *skip, int type_class)
{
struct link_map **list = scope->r_list;
size_t n = scope->r_nlist;
/* Make sure we read the value before proceeding. Otherwise we
might use r_list pointing to the initial scope and r_nlist being
the value after a resize. That is the only path in dl-open.c not
protected by GSCOPE. A read barrier here might be to expensive. */
__asm volatile ("" : "+r" (n), "+m" (scope->r_list));
struct link_map **list = scope->r_list;
do
{