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elf: Add a DTV setup test [BZ #27136]
The test dlopens a large number of modules with TLS, they are reused from an existing test. The test relies on the reuse of slotinfo entries after dlclose, without bug 27135 fixed this needs a failing dlopen. With a slotinfo list that has non-monotone increasing generation counters, bug 27136 can trigger. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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parent
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10
elf/Makefile
10
elf/Makefile
@ -222,7 +222,8 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
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tst-audit14 tst-audit15 tst-audit16 \
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tst-single_threaded tst-single_threaded-pthread \
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tst-tls-ie tst-tls-ie-dlmopen argv0test \
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tst-glibc-hwcaps tst-glibc-hwcaps-prepend tst-glibc-hwcaps-mask
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tst-glibc-hwcaps tst-glibc-hwcaps-prepend tst-glibc-hwcaps-mask \
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tst-tls20
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# reldep9
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tests-internal += loadtest unload unload2 circleload1 \
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neededtest neededtest2 neededtest3 neededtest4 \
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@ -344,6 +345,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
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libmarkermod2-1 libmarkermod2-2 \
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libmarkermod3-1 libmarkermod3-2 libmarkermod3-3 \
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libmarkermod4-1 libmarkermod4-2 libmarkermod4-3 libmarkermod4-4 \
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tst-tls20mod-bad
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# Most modules build with _ISOMAC defined, but those filtered out
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# depend on internal headers.
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@ -1922,3 +1924,9 @@ $(objpfx)tst-rtld-help.out: $(objpfx)ld.so
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fi; \
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(exit $$status); \
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$(evaluate-test)
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# Reuses tst-tls-many-dynamic-modules
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tst-tls20mod-bad.so-no-z-defs = yes
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$(objpfx)tst-tls20: $(libdl) $(shared-thread-library)
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$(objpfx)tst-tls20.out: $(objpfx)tst-tls20mod-bad.so \
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$(tst-tls-many-dynamic-modules:%=$(objpfx)%.so)
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98
elf/tst-tls20.c
Normal file
98
elf/tst-tls20.c
Normal file
@ -0,0 +1,98 @@
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/* Test dtv setup if entries don't have monotone increasing generation.
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Copyright (C) 2021 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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<http://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/xdlfcn.h>
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#include <support/xthread.h>
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#define NMOD 100
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static void *mod[NMOD];
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static void
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load_fail (void)
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{
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/* Expected to fail because of a missing symbol. */
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void *m = dlopen ("tst-tls20mod-bad.so", RTLD_NOW);
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if (m != NULL)
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FAIL_EXIT1 ("dlopen of tst-tls20mod-bad.so succeeded\n");
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}
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static void
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load_mod (int i)
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{
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char *buf = xasprintf ("tst-tls-manydynamic%02dmod.so", i);
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mod[i] = xdlopen (buf, RTLD_LAZY);
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free (buf);
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}
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static void
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unload_mod (int i)
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{
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if (mod[i] != NULL)
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xdlclose (mod[i]);
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mod[i] = NULL;
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}
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static void
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access (int i)
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{
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char *buf = xasprintf ("tls_global_%02d", i);
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dlerror ();
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int *p = dlsym (mod[i], buf);
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printf ("mod[%d]: &tls = %p\n", i, p);
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if (p == NULL)
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FAIL_EXIT1 ("dlsym failed: %s\n", dlerror ());
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++*p;
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free (buf);
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}
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static void *
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start (void *a)
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{
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for (int i = 0; i < NMOD; i++)
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if (mod[i] != NULL)
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access (i);
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return 0;
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}
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static int
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do_test (void)
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{
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int i;
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for (i = 0; i < NMOD; i++)
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{
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load_mod (i);
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/* Bump the generation of mod[0] without using new dtv slot. */
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unload_mod (0);
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load_fail (); /* Ensure GL(dl_tls_dtv_gaps) is true: see bug 27135. */
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load_mod (0);
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/* Access TLS in all loaded modules. */
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pthread_t t = xpthread_create (0, start, 0);
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xpthread_join (t);
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}
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for (i = 0; i < NMOD; i++)
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unload_mod (i);
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return 0;
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}
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#include <support/test-driver.c>
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2
elf/tst-tls20mod-bad.c
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2
elf/tst-tls20mod-bad.c
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@ -0,0 +1,2 @@
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void missing_symbol (void);
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void f (void) {missing_symbol ();}
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