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elf: Call __libc_early_init for reused namespaces (bug 29528)
libc_map is never reset to NULL, neither during dlclose nor on a dlopen call which reuses the namespace structure. As a result, if a namespace is reused, its libc is not initialized properly. The most visible result is a crash in the <ctype.h> functions. To prevent similar bugs on namespace reuse from surfacing, unconditionally initialize the chosen namespace to zero using memset.
This commit is contained in:
Florian Weimer
parent
06d4381dd8
commit
d0e357ff45
@ -410,6 +410,7 @@ tests += \
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tst-dlmopen4 \
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tst-dlmopen-dlerror \
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tst-dlmopen-gethostbyname \
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tst-dlmopen-twice \
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tst-dlopenfail \
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tst-dlopenfail-2 \
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tst-dlopenrpath \
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@ -839,6 +840,8 @@ modules-names += \
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tst-dlmopen1mod \
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tst-dlmopen-dlerror-mod \
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tst-dlmopen-gethostbyname-mod \
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tst-dlmopen-twice-mod1 \
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tst-dlmopen-twice-mod2 \
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tst-dlopenfaillinkmod \
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tst-dlopenfailmod1 \
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tst-dlopenfailmod2 \
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@ -2976,3 +2979,7 @@ $(objpfx)tst-audit-tlsdesc.out: $(objpfx)tst-auditmod-tlsdesc.so
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tst-audit-tlsdesc-ENV = LD_AUDIT=$(objpfx)tst-auditmod-tlsdesc.so
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$(objpfx)tst-audit-tlsdesc-dlopen.out: $(objpfx)tst-auditmod-tlsdesc.so
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tst-audit-tlsdesc-dlopen-ENV = LD_AUDIT=$(objpfx)tst-auditmod-tlsdesc.so
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$(objpfx)tst-dlmopen-twice.out: \
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$(objpfx)tst-dlmopen-twice-mod1.so \
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$(objpfx)tst-dlmopen-twice-mod2.so
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@ -844,11 +844,14 @@ _dl_open (const char *file, int mode, const void *caller_dlopen, Lmid_t nsid,
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_dl_signal_error (EINVAL, file, NULL, N_("\
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no more namespaces available for dlmopen()"));
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}
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else if (nsid == GL(dl_nns))
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{
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__rtld_lock_initialize (GL(dl_ns)[nsid]._ns_unique_sym_table.lock);
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++GL(dl_nns);
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}
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if (nsid == GL(dl_nns))
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++GL(dl_nns);
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/* Initialize the new namespace. Most members are
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zero-initialized, only the lock needs special treatment. */
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memset (&GL(dl_ns)[nsid], 0, sizeof (GL(dl_ns)[nsid]));
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__rtld_lock_initialize (GL(dl_ns)[nsid]._ns_unique_sym_table.lock);
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_dl_debug_update (nsid)->r_state = RT_CONSISTENT;
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}
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37
elf/tst-dlmopen-twice-mod1.c
Normal file
37
elf/tst-dlmopen-twice-mod1.c
Normal file
@ -0,0 +1,37 @@
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/* Initialization of libc after dlmopen/dlclose/dlmopen (bug 29528). Module 1.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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static void __attribute__ ((constructor))
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init (void)
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{
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puts ("info: tst-dlmopen-twice-mod1.so loaded");
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fflush (stdout);
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}
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static void __attribute__ ((destructor))
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fini (void)
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{
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puts ("info: tst-dlmopen-twice-mod1.so about to be unloaded");
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fflush (stdout);
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}
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/* Large allocation. The second module does not have this, so it
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should load libc at a different address. */
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char large_allocate[16 * 1024 * 1024];
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50
elf/tst-dlmopen-twice-mod2.c
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50
elf/tst-dlmopen-twice-mod2.c
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@ -0,0 +1,50 @@
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/* Initialization of libc after dlmopen/dlclose/dlmopen (bug 29528). Module 2.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <stdio.h>
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static void __attribute__ ((constructor))
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init (void)
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{
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puts ("info: tst-dlmopen-twice-mod2.so loaded");
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fflush (stdout);
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}
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static void __attribute__ ((destructor))
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fini (void)
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{
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puts ("info: tst-dlmopen-twice-mod2.so about to be unloaded");
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fflush (stdout);
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}
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int
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run_check (void)
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{
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puts ("info: about to call isalpha");
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fflush (stdout);
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volatile char ch = 'a';
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if (!isalpha (ch))
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{
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puts ("error: isalpha ('a') is not true");
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fflush (stdout);
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return 1;
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}
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return 0;
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}
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34
elf/tst-dlmopen-twice.c
Normal file
34
elf/tst-dlmopen-twice.c
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@ -0,0 +1,34 @@
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/* Initialization of libc after dlmopen/dlclose/dlmopen (bug 29528). Main.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/xdlfcn.h>
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#include <support/check.h>
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static int
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do_test (void)
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{
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void *handle = xdlmopen (LM_ID_NEWLM, "tst-dlmopen-twice-mod1.so", RTLD_NOW);
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xdlclose (handle);
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handle = xdlmopen (LM_ID_NEWLM, "tst-dlmopen-twice-mod2.so", RTLD_NOW);
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int (*run_check) (void) = xdlsym (handle, "run_check");
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TEST_COMPARE (run_check (), 0);
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xdlclose (handle);
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return 0;
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}
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#include <support/test-driver.c>
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