Fix ordering of DSO constructors and destructors.

This commit is contained in:
Ulrich Drepper 2011-01-19 15:32:35 -05:00
parent 86e9235918
commit 968dad0ab1
19 changed files with 387 additions and 109 deletions

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@ -1,3 +1,30 @@
2011-01-19 Ulrich Drepper <drepper@gmail.com>
* elf/dl-deps.c (_dl_map_object_deps): Rewrite sorting determining order
of constructors.
* elf/dl-fini.c (_dl_sort_fini): Rewrite sorting determining order
of destructors.
(_dl_fini): Don't call _dl_sort_fini if there is only one object.
[BZ #11724]
* elf/Makefile: Add rules to build and run new test.
* elf/tst-initorder.c: New file.
* elf/tst-initorder.exp: New file.
* elf/tst-initordera1.c: New file.
* elf/tst-initordera2.c: New file.
* elf/tst-initordera3.c: New file.
* elf/tst-initordera4.c: New file.
* elf/tst-initorderb1.c: New file.
* elf/tst-initorderb2.c: New file.
* elf/tst-order-a1.c: New file.
* elf/tst-order-a2.c: New file.
* elf/tst-order-a3.c: New file.
* elf/tst-order-a4.c: New file.
* elf/tst-order-b1.c: New file.
* elf/tst-order-b2.c: New file.
* elf/tst-order-main.c: New file.
New test case by George Gensure <werkt0@gmail.com>.
2010-10-01 Andreas Schwab <schwab@redhat.com>
* sysdeps/posix/getaddrinfo.c (gaih_inet): Don't discard result of

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@ -118,7 +118,10 @@ distribute := rtld-Rules \
ifuncmain7.c ifuncmain7pic.c ifuncmain7picstatic.c \
ifuncmain7pie.c ifuncmain7static.c \
tst-unique1.c tst-unique1mod1.c tst-unique1mod2.c \
tst-unique2.c tst-unique2mod1.c tst-unique2mod2.c
tst-unique2.c tst-unique2mod1.c tst-unique2mod2.c \
tst-initordera1.c tst-initordera2.c tst-initorderb1.c \
tst-initorderb2.c tst-initordera3.c tst-initordera4.c \
tst-initorder.c
CFLAGS-dl-runtime.c = -fexceptions -fasynchronous-unwind-tables
CFLAGS-dl-lookup.c = -fexceptions -fasynchronous-unwind-tables
@ -198,7 +201,8 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
unload3 unload4 unload5 unload6 unload7 tst-global1 order2 \
tst-audit1 tst-audit2 \
tst-stackguard1 tst-addr1 tst-thrlock \
tst-unique1 tst-unique2
tst-unique1 tst-unique2 \
tst-initorder
# reldep9
test-srcs = tst-pathopt
tests-execstack-yes = tst-execstack tst-execstack-needed tst-execstack-prog
@ -250,7 +254,10 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
unload7mod1 unload7mod2 \
order2mod1 order2mod2 order2mod3 order2mod4 \
tst-unique1mod1 tst-unique1mod2 \
tst-unique2mod1 tst-unique2mod2
tst-unique2mod1 tst-unique2mod2 \
tst-initordera1 tst-initorderb1 \
tst-initordera2 tst-initorderb2 \
tst-initordera3 tst-initordera4
ifeq (yes,$(have-initfini-array))
modules-names += tst-array2dep tst-array5dep
endif
@ -531,6 +538,11 @@ $(objpfx)unload6mod2.so: $(libdl)
$(objpfx)unload6mod3.so: $(libdl)
$(objpfx)unload7mod1.so: $(libdl)
$(objpfx)unload7mod2.so: $(objpfx)unload7mod1.so
$(objpfx)tst-initordera2.so: $(objpfx)tst-initordera1.so
$(objpfx)tst-initorderb2.so: $(objpfx)tst-initorderb1.so $(objpfx)tst-initordera2.so
$(objpfx)tst-initordera3.so: $(objpfx)tst-initorderb2.so $(objpfx)tst-initorderb1.so
$(objpfx)tst-initordera4.so: $(objpfx)tst-initordera3.so
$(objpfx)tst-initorder: $(objpfx)tst-initordera4.so $(objpfx)tst-initordera1.so $(objpfx)tst-initorderb2.so
LDFLAGS-tst-tlsmod5.so = -nostdlib
LDFLAGS-tst-tlsmod6.so = -nostdlib
@ -1162,6 +1174,12 @@ $(objpfx)tst-unique1.out: $(objpfx)tst-unique1mod1.so \
$(objpfx)tst-unique2: $(libdl) $(objpfx)tst-unique2mod1.so
$(objpfx)tst-unique2.out: $(objpfx)tst-unique2mod2.so
$(objpfx)tst-initorder.out: $(objpfx)tst-initorder
$(elf-objpfx)${rtld-installed-name} \
--library-path $(rpath-link)$(patsubst %,:%,$(sysdep-library-path)) \
$< > $@
cmp $@ tst-initorder.exp > /dev/null
ifeq (yes,$(config-cflags-avx))
CFLAGS-tst-audit4.c += -mavx
CFLAGS-tst-auditmod4a.c += -mavx

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@ -1,5 +1,5 @@
/* Load the dependencies of a mapped object.
Copyright (C) 1996-2003, 2004, 2005, 2006, 2007, 2010
Copyright (C) 1996-2003, 2004, 2005, 2006, 2007, 2010, 2011
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -616,48 +616,60 @@ Filters not supported with LD_TRACE_PRELINKING"));
/* Now determine the order in which the initialization has to happen. */
memcpy (l_initfini, map->l_searchlist.r_list,
nlist * sizeof (struct link_map *));
/* We can skip looking for the binary itself which is at the front
of the search list. Look through the list backward so that circular
dependencies are not changing the order. */
for (i = 1; i < nlist; ++i)
of the search list. */
assert (nlist > 1);
i = 1;
bool seen[nlist];
memset (seen, false, nlist * sizeof (seen[0]));
while (1)
{
struct link_map *l = map->l_searchlist.r_list[i];
unsigned int j;
unsigned int k;
/* Keep track of which object we looked at this round. */
seen[i] = true;
struct link_map *thisp = l_initfini[i];
/* Find the place in the initfini list where the map is currently
located. */
for (j = 1; l_initfini[j] != l; ++j)
;
/* Find all object for which the current one is a dependency and
move the found object (if necessary) in front. */
for (k = j + 1; k < nlist; ++k)
/* Find the last object in the list for which the current one is
a dependency and move the current object behind the object
with the dependency. */
unsigned int k = nlist - 1;
while (k > i)
{
struct link_map **runp;
runp = l_initfini[k]->l_initfini;
struct link_map **runp = l_initfini[k]->l_initfini;
if (runp != NULL)
{
/* Look through the dependencies of the object. */
while (*runp != NULL)
if (__builtin_expect (*runp++ == l, 0))
if (__builtin_expect (*runp++ == thisp, 0))
{
struct link_map *here = l_initfini[k];
/* Move the current object to the back past the last
object with it as the dependency. */
memmove (&l_initfini[i], &l_initfini[i + 1],
(k - i) * sizeof (l_initfini[0]));
l_initfini[k] = thisp;
/* Move it now. */
memmove (&l_initfini[j] + 1, &l_initfini[j],
(k - j) * sizeof (struct link_map *));
l_initfini[j] = here;
if (seen[i + 1])
{
++i;
goto next_clear;
}
/* Don't insert further matches before the last
entry moved to the front. */
++j;
memmove (&seen[i], &seen[i + 1], (k - i) * sizeof (seen[0]));
seen[k] = true;
goto next;
}
--k;
}
if (++i == nlist)
break;
next_clear:
memset (&seen[i], false, (nlist - i) * sizeof (seen[0]));
next:;
}
}
}
}
/* Terminate the list of dependencies. */
l_initfini[nlist] = NULL;
atomic_write_barrier ();

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@ -1,5 +1,6 @@
/* Call the termination functions of loaded shared objects.
Copyright (C) 1995,96,1998-2002,2004-2005,2009 Free Software Foundation, Inc.
Copyright (C) 1995,96,1998-2002,2004-2005,2009,2011
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
@ -32,52 +33,60 @@ internal_function
_dl_sort_fini (struct link_map *l, struct link_map **maps, size_t nmaps,
char *used, Lmid_t ns)
{
if (ns == LM_ID_BASE)
/* The main executable always comes first. */
l = l->l_next;
/* We can skip looking for the binary itself which is at the front
of the search list for the main namespace. */
assert (nmaps > 1);
unsigned int i = ns == LM_ID_BASE;
bool seen[nmaps];
memset (seen, false, nmaps * sizeof (seen[0]));
while (1)
{
/* Keep track of which object we looked at this round. */
seen[i] = true;
struct link_map *thisp = maps[i];
for (; l != NULL; l = l->l_next)
/* Do not handle ld.so in secondary namespaces and object which
are not removed. */
if (l == l->l_real && l->l_idx != -1)
{
/* Find the place in the 'maps' array. */
unsigned int j;
for (j = ns == LM_ID_BASE ? 1 : 0; maps[j] != l; ++j)
assert (j < nmaps);
if (thisp != thisp->l_real || thisp->l_idx == -1)
goto skip;
/* Find all object for which the current one is a dependency
and move the found object (if necessary) in front. */
for (unsigned int k = j + 1; k < nmaps; ++k)
/* Find the last object in the list for which the current one is
a dependency and move the current object behind the object
with the dependency. */
unsigned int k = nmaps - 1;
while (k > i)
{
struct link_map **runp = maps[k]->l_initfini;
if (runp != NULL)
{
/* Look through the dependencies of the object. */
while (*runp != NULL)
if (*runp == l)
if (__builtin_expect (*runp++ == thisp, 0))
{
struct link_map *here = maps[k];
/* Move it now. */
memmove (&maps[j] + 1,
&maps[j], (k - j) * sizeof (struct link_map *));
maps[j] = here;
move:
/* Move the current object to the back past the last
object with it as the dependency. */
memmove (&maps[i], &maps[i + 1],
(k - i) * sizeof (maps[0]));
maps[k] = thisp;
if (used != NULL)
{
char here_used = used[k];
memmove (&used[j] + 1,
&used[j], (k - j) * sizeof (char));
used[j] = here_used;
char here_used = used[i];
memmove (&used[i], &used[i + 1],
(k - i) * sizeof (used[0]));
used[k] = here_used;
}
++j;
break;
if (seen[i + 1])
{
++i;
goto next_clear;
}
else
++runp;
memmove (&seen[i], &seen[i + 1], (k - i) * sizeof (seen[0]));
seen[k] = true;
goto next;
}
if (__builtin_expect (maps[k]->l_reldeps != NULL, 0))
@ -85,32 +94,22 @@ _dl_sort_fini (struct link_map *l, struct link_map **maps, size_t nmaps,
unsigned int m = maps[k]->l_reldeps->act;
struct link_map **relmaps = &maps[k]->l_reldeps->list[0];
/* Look through the relocation dependencies of the object. */
while (m-- > 0)
{
if (relmaps[m] == l)
{
struct link_map *here = maps[k];
/* Move it now. */
memmove (&maps[j] + 1,
&maps[j],
(k - j) * sizeof (struct link_map *));
maps[j] = here;
if (used != NULL)
{
char here_used = used[k];
memmove (&used[j] + 1,
&used[j], (k - j) * sizeof (char));
used[j] = here_used;
if (__builtin_expect (relmaps[m] == thisp, 0))
goto move;
}
--k;
}
skip:
if (++i == nmaps)
break;
}
}
}
}
next_clear:
memset (&seen[i], false, (nmaps - i) * sizeof (seen[0]));
next:;
}
}
@ -196,7 +195,7 @@ _dl_fini (void)
assert (ns == LM_ID_BASE || i == nloaded || i == nloaded - 1);
nmaps = i;
if (nmaps != 0)
if (nmaps > 1)
/* Now we have to do the sorting. */
_dl_sort_fini (GL(dl_ns)[ns]._ns_loaded, maps, nmaps, NULL, ns);

7
elf/tst-initorder.c Normal file
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@ -0,0 +1,7 @@
#include <stdio.h>
int
main( int argc, char *argv[] )
{
printf( "main\n" );
}

13
elf/tst-initorder.exp Normal file
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@ -0,0 +1,13 @@
start_a1
start_a2
start_b1
start_b2
start_a3
start_a4
main
finish_a4
finish_a3
finish_b2
finish_b1
finish_a2
finish_a1

16
elf/tst-initordera1.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_a1( void ) __attribute__((constructor));
extern void finish_a1( void ) __attribute__((destructor));
void
start_a1( void )
{
printf( "start_a1\n" );
}
void
finish_a1( void )
{
printf( "finish_a1\n" );
}

16
elf/tst-initordera2.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_a2( void ) __attribute__((constructor));
extern void finish_a2( void ) __attribute__((destructor));
void
start_a2( void )
{
printf( "start_a2\n" );
}
void
finish_a2( void )
{
printf( "finish_a2\n" );
}

16
elf/tst-initordera3.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_a3( void ) __attribute__((constructor));
extern void finish_a3( void ) __attribute__((destructor));
void
start_a3( void )
{
printf( "start_a3\n" );
}
void
finish_a3( void )
{
printf( "finish_a3\n" );
}

16
elf/tst-initordera4.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_a4( void ) __attribute__((constructor));
extern void finish_a4( void ) __attribute__((destructor));
void
start_a4( void )
{
printf( "start_a4\n" );
}
void
finish_a4( void )
{
printf( "finish_a4\n" );
}

16
elf/tst-initorderb1.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_b1( void ) __attribute__((constructor));
extern void finish_b1( void ) __attribute__((destructor));
void
start_b1( void )
{
printf( "start_b1\n" );
}
void
finish_b1( void )
{
printf( "finish_b1\n" );
}

16
elf/tst-initorderb2.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_b2( void ) __attribute__((constructor));
extern void finish_b2( void ) __attribute__((destructor));
void
start_b2( void )
{
printf( "start_b2\n" );
}
void
finish_b2( void )
{
printf( "finish_b2\n" );
}

16
elf/tst-order-a1.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_a1( void ) __attribute__((constructor));
extern void finish_a1( void ) __attribute__((destructor));
void
start_a1( void )
{
printf( "start_a1\n" );
}
void
finish_a1( void )
{
printf( "finish_a1\n" );
}

16
elf/tst-order-a2.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_a2( void ) __attribute__((constructor));
extern void finish_a2( void ) __attribute__((destructor));
void
start_a2( void )
{
printf( "start_a2\n" );
}
void
finish_a2( void )
{
printf( "finish_a2\n" );
}

16
elf/tst-order-a3.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_a3( void ) __attribute__((constructor));
extern void finish_a3( void ) __attribute__((destructor));
void
start_a3( void )
{
printf( "start_a3\n" );
}
void
finish_a3( void )
{
printf( "finish_a3\n" );
}

16
elf/tst-order-a4.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_a4( void ) __attribute__((constructor));
extern void finish_a4( void ) __attribute__((destructor));
void
start_a4( void )
{
printf( "start_a4\n" );
}
void
finish_a4( void )
{
printf( "finish_a4\n" );
}

16
elf/tst-order-b1.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_b1( void ) __attribute__((constructor));
extern void finish_b1( void ) __attribute__((destructor));
void
start_b1( void )
{
printf( "start_b1\n" );
}
void
finish_b1( void )
{
printf( "finish_b1\n" );
}

16
elf/tst-order-b2.c Normal file
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@ -0,0 +1,16 @@
#include <stdio.h>
extern void start_b2( void ) __attribute__((constructor));
extern void finish_b2( void ) __attribute__((destructor));
void
start_b2( void )
{
printf( "start_b2\n" );
}
void
finish_b2( void )
{
printf( "finish_b2\n" );
}

10
elf/tst-order-main.c Normal file
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@ -0,0 +1,10 @@
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int
main( int argc, char *argv[] )
{
printf( "main\n" );
exit(EXIT_SUCCESS);
}