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dlopen: Fix issues related to NODELETE handling and relocations

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The assumption behind the assert in activate_nodelete was wrong:

Inconsistency detected by ld.so: dl-open.c: 459: activate_nodelete:
Assertion `!imap->l_init_called || imap->l_type != lt_loaded' failed! (edit)

It can happen that an already-loaded object that is in the local
scope is promoted to NODELETE status, via binding to a unique
symbol.

Similarly, it is possible that such NODELETE promotion occurs to
an already-loaded object from the global scope.  This is why the
loop in activate_nodelete has to cover all objects in the namespace
of the new object.

In do_lookup_unique, it could happen that the NODELETE status of
an already-loaded object was overwritten with a pending NODELETE
status.  As a result, if dlopen fails, this could cause a loss of
the NODELETE status of the affected object, eventually resulting
in an incorrect unload.

Fixes commit f63b73814f ("Remove all
loaded objects if dlopen fails, ignoring NODELETE [BZ #20839]").
This commit is contained in:
Florian Weimer 2019-12-13 10:18:24 +01:00
parent 186e119bbd
commit 365624e2d2
23 changed files with 992 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
elf/Makefile
View File

@ -191,7 +191,7 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
tst-audit1 tst-audit2 tst-audit8 tst-audit9 \
tst-addr1 tst-thrlock \
tst-unique1 tst-unique2 $(if $(CXX),tst-unique3 tst-unique4 \
tst-nodelete) \
tst-nodelete tst-dlopen-nodelete-reloc) \
tst-initorder tst-initorder2 tst-relsort1 tst-null-argv \
tst-tlsalign tst-tlsalign-extern tst-nodelete-opened \
tst-nodelete2 tst-audit11 tst-audit12 tst-dlsym-error tst-noload \
@ -271,7 +271,24 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
tst-auditmod9a tst-auditmod9b \
$(if $(CXX),tst-unique3lib tst-unique3lib2 tst-unique4lib \
tst-nodelete-uniquemod tst-nodelete-rtldmod \
tst-nodelete-zmod) \
tst-nodelete-zmod \
tst-dlopen-nodelete-reloc-mod1 \
tst-dlopen-nodelete-reloc-mod2 \
tst-dlopen-nodelete-reloc-mod3 \
tst-dlopen-nodelete-reloc-mod4 \
tst-dlopen-nodelete-reloc-mod5 \
tst-dlopen-nodelete-reloc-mod6 \
tst-dlopen-nodelete-reloc-mod7 \
tst-dlopen-nodelete-reloc-mod8 \
tst-dlopen-nodelete-reloc-mod9 \
tst-dlopen-nodelete-reloc-mod10 \
tst-dlopen-nodelete-reloc-mod11 \
tst-dlopen-nodelete-reloc-mod12 \
tst-dlopen-nodelete-reloc-mod13 \
tst-dlopen-nodelete-reloc-mod14 \
tst-dlopen-nodelete-reloc-mod15 \
tst-dlopen-nodelete-reloc-mod16 \
tst-dlopen-nodelete-reloc-mod17) \
tst-initordera1 tst-initorderb1 \
tst-initordera2 tst-initorderb2 \
tst-initordera3 tst-initordera4 \
@ -1627,3 +1644,48 @@ $(objpfx)tst-dlopenfailmod1.so: \
$(shared-thread-library) $(objpfx)tst-dlopenfaillinkmod.so
LDFLAGS-tst-dlopenfaillinkmod.so = -Wl,-soname,tst-dlopenfail-missingmod.so
$(objpfx)tst-dlopenfailmod2.so: $(shared-thread-library)
$(objpfx)tst-dlopen-nodelete-reloc: $(libdl)
$(objpfx)tst-dlopen-nodelete-reloc.out: \
$(objpfx)tst-dlopen-nodelete-reloc-mod1.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod2.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod3.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod4.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod5.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod6.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod7.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod8.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod9.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod10.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod11.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod12.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod13.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod14.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod15.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod16.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod17.so
tst-dlopen-nodelete-reloc-mod2.so-no-z-defs = yes
LDFLAGS-tst-dlopen-nodelete-reloc-mod2.so = -Wl,-z,nodelete
$(objpfx)tst-dlopen-nodelete-reloc-mod4.so: \
$(objpfx)tst-dlopen-nodelete-reloc-mod3.so
LDFLAGS-tst-dlopen-nodelete-reloc-mod4.so = -Wl,--no-as-needed
$(objpfx)tst-dlopen-nodelete-reloc-mod5.so: \
$(objpfx)tst-dlopen-nodelete-reloc-mod4.so
LDFLAGS-tst-dlopen-nodelete-reloc-mod5.so = -Wl,-z,nodelete,--no-as-needed
tst-dlopen-nodelete-reloc-mod5.so-no-z-defs = yes
tst-dlopen-nodelete-reloc-mod7.so-no-z-defs = yes
$(objpfx)tst-dlopen-nodelete-reloc-mod8.so: $(libdl)
$(objpfx)tst-dlopen-nodelete-reloc-mod10.so: $(libdl)
tst-dlopen-nodelete-reloc-mod11.so-no-z-defs = yes
$(objpfx)tst-dlopen-nodelete-reloc-mod13.so: \
$(objpfx)tst-dlopen-nodelete-reloc-mod12.so
$(objpfx)tst-dlopen-nodelete-reloc-mod15.so: \
$(objpfx)tst-dlopen-nodelete-reloc-mod14.so
tst-dlopen-nodelete-reloc-mod16.so-no-z-defs = yes
$(objpfx)tst-dlopen-nodelete-reloc-mod16.so: \
$(objpfx)tst-dlopen-nodelete-reloc-mod15.so
LDFLAGS-tst-dlopen-nodelete-reloc-mod16.so = -Wl,--no-as-needed
$(objpfx)tst-dlopen-nodelete-reloc-mod17.so: \
$(objpfx)tst-dlopen-nodelete-reloc-mod15.so \
$(objpfx)tst-dlopen-nodelete-reloc-mod16.so
LDFLAGS-tst-dlopen-nodelete-reloc-mod17.so = -Wl,--no-as-needed

6
elf/dl-lookup.c
View File

@ -311,12 +311,12 @@ do_lookup_unique (const char *undef_name, uint_fast32_t new_hash,
enter_unique_sym (entries, size,
new_hash, strtab + sym->st_name, sym, map);
if (map->l_type == lt_loaded)
if (map->l_type == lt_loaded
&& map->l_nodelete == link_map_nodelete_inactive)
{
/* Make sure we don't unload this object by
setting the appropriate flag. */
if (__glibc_unlikely (GLRO (dl_debug_mask) & DL_DEBUG_BINDINGS)
&& map->l_nodelete == link_map_nodelete_inactive)
if (__glibc_unlikely (GLRO (dl_debug_mask) & DL_DEBUG_BINDINGS))
_dl_debug_printf ("\
marking %s [%lu] as NODELETE due to unique symbol\n",
map->l_name, map->l_ns);

41
elf/dl-open.c
View File

@ -433,34 +433,21 @@ TLS generation counter wrapped! Please report this."));
after dlopen failure is not possible, so that _dl_close can clean
up objects if necessary. */
static void
activate_nodelete (struct link_map *new, int mode)
activate_nodelete (struct link_map *new)
{
if (mode & RTLD_NODELETE || new->l_nodelete == link_map_nodelete_pending)
{
if (__glibc_unlikely (GLRO (dl_debug_mask) & DL_DEBUG_FILES))
_dl_debug_printf ("activating NODELETE for %s [%lu]\n",
new->l_name, new->l_ns);
new->l_nodelete = link_map_nodelete_active;
}
/* It is necessary to traverse the entire namespace. References to
objects in the global scope and unique symbol bindings can force
NODELETE status for objects outside the local scope. */
for (struct link_map *l = GL (dl_ns)[new->l_ns]._ns_loaded; l != NULL;
l = l->l_next)
if (l->l_nodelete == link_map_nodelete_pending)
{
if (__glibc_unlikely (GLRO (dl_debug_mask) & DL_DEBUG_FILES))
_dl_debug_printf ("activating NODELETE for %s [%lu]\n",
l->l_name, l->l_ns);
for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
{
struct link_map *imap = new->l_searchlist.r_list[i];
if (imap->l_nodelete == link_map_nodelete_pending)
{
if (__glibc_unlikely (GLRO (dl_debug_mask) & DL_DEBUG_FILES))
_dl_debug_printf ("activating NODELETE for %s [%lu]\n",
imap->l_name, imap->l_ns);
/* Only new objects should have set
link_map_nodelete_pending. Existing objects should not
have gained any new dependencies and therefore cannot
reach NODELETE status. */
assert (!imap->l_init_called || imap->l_type != lt_loaded);
imap->l_nodelete = link_map_nodelete_active;
}
}
l->l_nodelete = link_map_nodelete_active;
}
}
/* struct dl_init_args and call_dl_init are used to call _dl_init with
@ -721,7 +708,7 @@ dl_open_worker (void *a)
All memory allocations for new objects must have happened
before. */
activate_nodelete (new, mode);
activate_nodelete (new);
/* Second stage after resize_scopes: Actually perform the scope
update. After this, dlsym and lazy binding can bind to new

39
elf/tst-dlopen-nodelete-reloc-mod1.c Normal file
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@ -0,0 +1,39 @@
/* Test propagation of NODELETE to an already-loaded object via relocation.
Non-NODELETE helper module.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Globally exported. Set by the main program to true before
termination, and used by tst-dlopen-nodelete-reloc-mod2.so to
trigger marking this module as NODELETE (and also for its destructor
check). */
bool may_finalize_mod1 = false;
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod1)
{
puts ("error: tst-dlopen-nodelete-reloc-mod1.so destructor"
" called too early");
_exit (1);
}
}

41
elf/tst-dlopen-nodelete-reloc-mod10.c Normal file
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@ -0,0 +1,41 @@
/* Helper module to load tst-dlopen-nodelete-reloc-mod11.so.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <stddef.h>
#include <stdio.h>
#include <unistd.h>
static void *handle;
static void __attribute__ ((constructor))
init (void)
{
handle = dlopen ("tst-dlopen-nodelete-reloc-mod11.so", RTLD_NOW);
if (handle == NULL)
{
printf ("error: dlopen in module 10: %s\n", dlerror ());
_exit (1);
}
}
static void __attribute__ ((destructor))
fini (void)
{
dlclose (handle);
}

49
elf/tst-dlopen-nodelete-reloc-mod11.cc Normal file
View File

@ -0,0 +1,49 @@
/* Second module defining a unique symbol (loaded indirectly).
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-dlopen-nodelete-reloc.h"
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Just a flag here, not used for NODELETE processing. */
bool may_finalize_mod11 = false;
/* Trigger the creation of a unique symbol reference. This should
cause tst-dlopen-nodelete-reloc-mod9.so to be marked as
NODELETE. */
extern template struct unique_symbol<9>;
int
global_function_mod11 (void)
{
return unique_symbol<9>::value;
}
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod11)
{
puts ("error: tst-dlopen-nodelete-reloc-mod11.so destructor"
" called too early");
_exit (1);
}
}

42
elf/tst-dlopen-nodelete-reloc-mod12.cc Normal file
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@ -0,0 +1,42 @@
/* First module for NODELETE test defining a unique symbol (with DT_NEEDED).
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-dlopen-nodelete-reloc.h"
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Just a flag here, not used for NODELETE processing. */
bool may_finalize_mod12 = false;
/* Explicit instantiation. This produces a unique symbol definition
which is not referenced by the library itself, so the library is
not marked NODELETE. */
template struct unique_symbol<12>;
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod12)
{
puts ("error: tst-dlopen-nodelete-reloc-mod12.so destructor"
" called too early");
_exit (1);
}
}

48
elf/tst-dlopen-nodelete-reloc-mod13.cc Normal file
View File

@ -0,0 +1,48 @@
/* Second module for NODELETE test defining a unique symbol (with DT_NEEDED).
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-dlopen-nodelete-reloc.h"
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Just a flag here, not used for NODELETE processing. */
bool may_finalize_mod13 = false;
extern template struct unique_symbol<12>;
/* Trigger the creation of a unique symbol reference. This should
cause tst-dlopen-nodelete-reloc-mod12.so to be marked as
NODELETE. */
int
global_function_mod13 (void)
{
return unique_symbol<12>::value;
}
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod13)
{
puts ("error: tst-dlopen-nodelete-reloc-mod13.so destructor"
" called too early");
_exit (1);
}
}

24
elf/tst-dlopen-nodelete-reloc-mod13.h Normal file
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@ -0,0 +1,24 @@
/* Inline function which produces a unique symbol.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
inline char *
third_function_with_local_static (void)
{
static char local;
return &local;
}

42
elf/tst-dlopen-nodelete-reloc-mod14.cc Normal file
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@ -0,0 +1,42 @@
/* This object must retain NODELETE status after a dlopen failure.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-dlopen-nodelete-reloc.h"
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Just a flag here, not used for NODELETE processing. */
bool may_finalize_mod14 = false;
/* Explicit instantiation. This produces a unique symbol definition
which is not referenced by the library itself, so the library is
not marked NODELETE. */
template struct unique_symbol<14>;
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod14)
{
puts ("error: tst-dlopen-nodelete-reloc-mod14.so destructor"
" called too early");
_exit (1);
}
}

42
elf/tst-dlopen-nodelete-reloc-mod15.cc Normal file
View File

@ -0,0 +1,42 @@
/* Helper object to mark tst-dlopen-nodelete-reloc-mod14.so as NODELETE.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-dlopen-nodelete-reloc.h"
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
extern template struct unique_symbol<14>;
/* Trigger the creation of a unique symbol reference. This should
cause tst-dlopen-nodelete-reloc-mod14.so to be marked as
NODELETE. */
int
global_function_mod15 (void)
{
return unique_symbol<14>::value;
}
static void __attribute__ ((destructor))
fini (void)
{
/* This object is never loaded completely. */
puts ("error: tst-dlopen-nodelete-reloc-mod15.so destructor invoked");
_exit (1);
}

27
elf/tst-dlopen-nodelete-reloc-mod16.c Normal file
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@ -0,0 +1,27 @@
/* Object with an undefined symbol to trigger a relocation failure.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* The reference to undefined_mod16 triggers a relocation failure. */
extern int undefined_mod16;
int
global_function_mod16 (void)
{
return undefined_mod16;
}

19
elf/tst-dlopen-nodelete-reloc-mod17.c Normal file
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@ -0,0 +1,19 @@
/* Top-level object with dependency on an object that fails relocation.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* The dependencies do all the work. */

38
elf/tst-dlopen-nodelete-reloc-mod2.c Normal file
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@ -0,0 +1,38 @@
/* Test propagation of NODELETE to an already-loaded object via relocation.
NODELETE helper module.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Defined in tst-dlopen-nodelete-reloc-mod1.so. This dependency is
not expressed via DT_NEEDED, so this reference marks the other
object as NODELETE dynamically, during initially relocation. */
extern bool may_finalize_mod1;
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod1)
{
puts ("error: tst-dlopen-nodelete-reloc-mod2.so destructor"
" called too early");
_exit (1);
}
}

38
elf/tst-dlopen-nodelete-reloc-mod3.c Normal file
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@ -0,0 +1,38 @@
/* Test propagation of NODELETE to an already-loaded object via relocation.
Non-NODELETE helper module.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Globally exported. Set by the main program to true before
termination, and used by tst-dlopen-nodelete-reloc-mod4.so,
tst-dlopen-nodelete-reloc-mod5.so. */
bool may_finalize_mod3 = false;
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod3)
{
puts ("error: tst-dlopen-nodelete-reloc-mod3.so destructor"
" called too early");
_exit (1);
}
}

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/* Test propagation of NODELETE to an already-loaded object via relocation.
Intermediate helper module.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Defined in tst-dlopen-nodelete-reloc-mod3.so. The dependency is
expressed via DT_NEEDED. */
extern bool may_finalize_mod3;
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod3)
{
puts ("error: tst-dlopen-nodelete-reloc-mod4.so destructor"
" called too early");
_exit (1);
}
}

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/* Test propagation of NODELETE to an already-loaded object via relocation.
NODELETE helper module.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Defined in tst-dlopen-nodelete-reloc-mod3.so. The dependency is
expressed via DT_NEEDED on the intermediate DSO
tst-dlopen-nodelete-reloc-mod3.so. */
extern bool may_finalize_mod3;
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod3)
{
puts ("error: tst-dlopen-nodelete-reloc-mod5.so destructor"
" called too early");
_exit (1);
}
}

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/* First module for NODELETE test defining a unique symbol.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-dlopen-nodelete-reloc.h"
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Just a flag here, not used for NODELETE processing. */
bool may_finalize_mod6 = false;
/* Explicit instantiation. This produces a unique symbol definition
which is not referenced by the library itself, so the library is
not marked NODELETE. */
template struct unique_symbol<6>;
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod6)
{
puts ("error: tst-dlopen-nodelete-reloc-mod6.so destructor"
" called too early");
_exit (1);
}
}

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/* Second module for NODELETE test defining a unique symbol.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-dlopen-nodelete-reloc.h"
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Just a flag here, not used for NODELETE processing. */
bool may_finalize_mod7 = false;
extern template struct unique_symbol<6>;
/* Trigger the creation of a unique symbol reference. This should
cause tst-dlopen-nodelete-reloc-mod6.so to be marked as
NODELETE. */
int
global_function_mod7 (void)
{
return unique_symbol<6>::value;
}
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod7)
{
puts ("error: tst-dlopen-nodelete-reloc-mod7.so destructor"
" called too early");
_exit (1);
}
}

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/* Helper module to load tst-dlopen-nodelete-reloc-mod9.so.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <stddef.h>
#include <stdio.h>
#include <unistd.h>
static void *handle;
static void __attribute__ ((constructor))
init (void)
{
handle = dlopen ("tst-dlopen-nodelete-reloc-mod9.so", RTLD_NOW);
if (handle == NULL)
{
printf ("error: dlopen in module 8: %s\n", dlerror ());
_exit (1);
}
}
static void __attribute__ ((destructor))
fini (void)
{
dlclose (handle);
}

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/* First module defining a unique symbol (loaded indirectly).
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "tst-dlopen-nodelete-reloc.h"
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
/* Just a flag here, not used for NODELETE processing. */
bool may_finalize_mod9 = false;
/* Explicit instantiation. This produces a unique symbol definition
which is not referenced by the library itself, so the library is
not marked NODELETE. */
template struct unique_symbol<9>;
static void __attribute__ ((destructor))
fini (void)
{
if (!may_finalize_mod9)
{
puts ("error: tst-dlopen-nodelete-reloc-mod9.so destructor"
" called too early");
_exit (1);
}
}

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/* Test interactions of dlopen, NODELETE, and relocations.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* This test exercises NODELETE propagation due to data relocations
and unique symbols, and the interaction with already-loaded
objects. Some test objects are written in C++, to produce unique
symbol definitions.
First test: Global scope variant, data relocation as the NODELETE
trigger. mod1 is loaded first with a separate dlopen call.
mod2 ---(may_finalize_mod1 relocation dependency)---> mod1
(NODELETE) (marked as NODELETE)
Second test: Local scope variant, data relocation. mod3 is loaded
first, then mod5.
mod5 ---(DT_NEEDED)---> mod4 ---(DT_NEEDED)---> mod3
(NODELETE) (not NODELETE) ^
\ / (marked as
`--(may_finalize_mod3 relocation dependency)--/ NODELETE)
Third test: Shared local scope with unique symbol. mod6 is loaded
first, then mod7. No explicit dependencies between the two
objects, so first object has to be opened with RTLD_GLOBAL.
mod7 ---(unique symbol)---> mod6
(marked as NODELETE)
Forth test: Non-shared scopes with unique symbol. mod8 and mod10
are loaded from the main program. mod8 loads mod9 from an ELF
constructor, mod10 loads mod11. There are no DT_NEEDED
dependencies. mod9 is promoted to the global scope form the main
program. The unique symbol dependency is:
mod9 ---(unique symbol)---> mod11
(marked as NODELETE)
Fifth test: Shared local scope with unique symbol, like test 3, but
this time, there is also a DT_NEEDED dependency (so no RTLD_GLOBAL
needed):
DT_NEEDED
mod13 ---(unique symbol)---> mod12
(marked as NODELETE)
Sixth test: NODELETE status is retained after relocation failure
with unique symbol dependency. The object graph ensures that the
unique symbol binding is processed before the dlopen failure.
DT_NEEDED
mod17 --(DT_NEEDED)--> mod15 --(unique symbol)--> mod14
\ ^ (RTLD_NODELETE)
\ (DT_NEEDED)
\ |
`---(DT_NEEDED)--> mod16
(fails to relocate)
mod14 is loaded first, and the loading mod17 is attempted.
mod14 must remain NODELETE after opening mod17 failed. */
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <support/check.h>
#include <support/xdlfcn.h>
static int
do_test (void)
{
/* First case: global scope, regular data symbol. Open the object
which is not NODELETE initially. */
void *mod1 = xdlopen ("tst-dlopen-nodelete-reloc-mod1.so",
RTLD_NOW | RTLD_GLOBAL);
/* This is used to indicate that the ELF destructor may be
called. */
bool *may_finalize_mod1 = xdlsym (mod1, "may_finalize_mod1");
/* Open the NODELETE object. */
void *mod2 = xdlopen ("tst-dlopen-nodelete-reloc-mod2.so", RTLD_NOW);
/* This has no effect because the DSO is directly marked as
NODELETE. */
xdlclose (mod2);
/* This has no effect because the DSO has been indirectly marked as
NODELETE due to a relocation dependency. */
xdlclose (mod1);
/* Second case: local scope, regular data symbol. Open the object
which is not NODELETE initially. */
void *mod3 = xdlopen ("tst-dlopen-nodelete-reloc-mod3.so", RTLD_NOW);
bool *may_finalize_mod3 = xdlsym (mod3, "may_finalize_mod3");
/* Open the NODELETE object. */
void *mod5 = xdlopen ("tst-dlopen-nodelete-reloc-mod5.so", RTLD_NOW);
/* Again those have no effect because of NODELETE. */
xdlclose (mod5);
xdlclose (mod3);
/* Third case: Unique symbol. */
void *mod6 = xdlopen ("tst-dlopen-nodelete-reloc-mod6.so",
RTLD_NOW | RTLD_GLOBAL);
bool *may_finalize_mod6 = xdlsym (mod6, "may_finalize_mod6");
void *mod7 = xdlopen ("tst-dlopen-nodelete-reloc-mod7.so", RTLD_NOW);
bool *may_finalize_mod7 = xdlsym (mod7, "may_finalize_mod7");
/* This should not have any effect because of the unique symbol and
the resulting NODELETE status. */
xdlclose (mod6);
/* mod7 is not NODELETE and can be closed. */
*may_finalize_mod7 = true;
xdlclose (mod7);
/* Fourth case: Unique symbol, indirect loading. */
void *mod8 = xdlopen ("tst-dlopen-nodelete-reloc-mod8.so", RTLD_NOW);
/* Also promote to global scope. */
void *mod9 = xdlopen ("tst-dlopen-nodelete-reloc-mod9.so",
RTLD_NOW | RTLD_NOLOAD | RTLD_GLOBAL);
bool *may_finalize_mod9 = xdlsym (mod9, "may_finalize_mod9");
xdlclose (mod9); /* Drop mod9 reference. */
void *mod10 = xdlopen ("tst-dlopen-nodelete-reloc-mod10.so", RTLD_NOW);
void *mod11 = xdlopen ("tst-dlopen-nodelete-reloc-mod11.so",
RTLD_NOW | RTLD_NOLOAD);
bool *may_finalize_mod11 = xdlsym (mod11, "may_finalize_mod11");
xdlclose (mod11); /* Drop mod11 reference. */
/* mod11 is not NODELETE and can be closed. */
*may_finalize_mod11 = true;
/* Trigger closing of mod11, too. */
xdlclose (mod10);
/* Does not trigger closing of mod9. */
xdlclose (mod8);
/* Fifth case: Unique symbol, with DT_NEEDED dependency. */
void *mod12 = xdlopen ("tst-dlopen-nodelete-reloc-mod12.so", RTLD_NOW);
bool *may_finalize_mod12 = xdlsym (mod12, "may_finalize_mod12");
void *mod13 = xdlopen ("tst-dlopen-nodelete-reloc-mod13.so", RTLD_NOW);
bool *may_finalize_mod13 = xdlsym (mod13, "may_finalize_mod13");
/* This should not have any effect because of the unique symbol. */
xdlclose (mod12);
/* mod13 is not NODELETE and can be closed. */
*may_finalize_mod13 = true;
xdlclose (mod13);
/* Sixth case: Unique symbol binding must not cause loss of NODELETE
status. */
void *mod14 = xdlopen ("tst-dlopen-nodelete-reloc-mod14.so",
RTLD_NOW | RTLD_NODELETE);
bool *may_finalize_mod14 = xdlsym (mod14, "may_finalize_mod14");
TEST_VERIFY (dlopen ("tst-dlopen-nodelete-reloc-mod17.so", RTLD_NOW)
== NULL);
const char *message = dlerror ();
printf ("info: test 6 message: %s\n", message);
/* This must not close the object, it must still be NODELETE. */
xdlclose (mod14);
xdlopen ("tst-dlopen-nodelete-reloc-mod14.so", RTLD_NOW | RTLD_NOLOAD);
/* Prepare for process exit. Destructors for NODELETE objects will
be invoked. */
*may_finalize_mod1 = true;
*may_finalize_mod3 = true;
*may_finalize_mod6 = true;
*may_finalize_mod9 = true;
*may_finalize_mod12 = true;
*may_finalize_mod14 = true;
return 0;
}
#include <support/test-driver.c>

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/* Template to produce unique symbols.
Copyright (C) 2019 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* This template produces a unique symbol definition for an explicit
template instantiation (without also incorporating a reference),
and an extern template declaration can be used to reference that
symbol from another object. The modid parameter is just a
placeholder to create different symbols (because it affects the
name mangling of the static value member). By convention, it
should match the number of the module that contains the
definition. */
template <int modid>
struct unique_symbol
{
static int value;
};
template <int modid>
int unique_symbol<modid>::value;