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Avoid ELF lookup race.

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On some architectures the update of the l_used field in the lookup
functions races with setting the other bits in the bitfield.  Simply
avoid this and optimize use of l_used in general.
This commit is contained in:
Ulrich Drepper
2009-12-15 12:32:27 -08:00
parent 2510d01ddb
commit 2af6396817
4 changed files with 23 additions and 8 deletions
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8
include/link.h
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@@ -1,6 +1,6 @@
/* Data structure for communication from the run-time dynamic linker for
loaded ELF shared objects.
Copyright (C) 1995-2006, 2007 Free Software Foundation, Inc.
Copyright (C) 1995-2006, 2007, 2009 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
@@ -180,7 +180,6 @@ struct link_map
unsigned int l_need_tls_init:1; /* Nonzero if GL(dl_init_static_tls)
should be called on this link map
when relocation finishes. */
unsigned int l_used:1; /* Nonzero if the DSO is used. */
unsigned int l_auditing:1; /* Nonzero if the DSO is used in auditing. */
unsigned int l_audit_any_plt:1; /* Nonzero if at least one audit module
is interested in the PLT interception.*/
@@ -239,12 +238,15 @@ struct link_map
struct link_map **l_initfini;
/* List of the dependencies introduced through symbol binding. */
unsigned int l_reldepsmax;
struct link_map_reldeps
{
unsigned int act;
struct link_map *list[];
} *l_reldeps;
unsigned int l_reldepsmax;
/* Nonzero if the DSO is used. */
unsigned int l_used;
/* Various flag words. */
ElfW(Word) l_feature_1;