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* [glibc] elf: Add a DTV setup test [BZ #27136]
@ 2021-04-15 8:33 Szabolcs Nagy
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From: Szabolcs Nagy @ 2021-04-15 8:33 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8f85075a2e9c26ff7486d4bbaf358999807d215c
commit 8f85075a2e9c26ff7486d4bbaf358999807d215c
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Thu Dec 31 12:24:38 2020 +0000
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>
Diff:
---
elf/Makefile | 10 +++++-
elf/tst-tls20.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++
elf/tst-tls20mod-bad.c | 2 ++
3 files changed, 109 insertions(+), 1 deletion(-)
diff --git a/elf/Makefile b/elf/Makefile
index de659655dc..c531470ede 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -222,7 +222,8 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
tst-audit14 tst-audit15 tst-audit16 \
tst-single_threaded tst-single_threaded-pthread \
tst-tls-ie tst-tls-ie-dlmopen argv0test \
- tst-glibc-hwcaps tst-glibc-hwcaps-prepend tst-glibc-hwcaps-mask
+ tst-glibc-hwcaps tst-glibc-hwcaps-prepend tst-glibc-hwcaps-mask \
+ tst-tls20
# reldep9
tests-internal += loadtest unload unload2 circleload1 \
neededtest neededtest2 neededtest3 neededtest4 \
@@ -344,6 +345,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
libmarkermod2-1 libmarkermod2-2 \
libmarkermod3-1 libmarkermod3-2 libmarkermod3-3 \
libmarkermod4-1 libmarkermod4-2 libmarkermod4-3 libmarkermod4-4 \
+ tst-tls20mod-bad
# Most modules build with _ISOMAC defined, but those filtered out
# depend on internal headers.
@@ -1922,3 +1924,9 @@ $(objpfx)tst-rtld-help.out: $(objpfx)ld.so
fi; \
(exit $$status); \
$(evaluate-test)
+
+# Reuses tst-tls-many-dynamic-modules
+tst-tls20mod-bad.so-no-z-defs = yes
+$(objpfx)tst-tls20: $(libdl) $(shared-thread-library)
+$(objpfx)tst-tls20.out: $(objpfx)tst-tls20mod-bad.so \
+ $(tst-tls-many-dynamic-modules:%=$(objpfx)%.so)
diff --git a/elf/tst-tls20.c b/elf/tst-tls20.c
new file mode 100644
index 0000000000..ac5f8c8d39
--- /dev/null
+++ b/elf/tst-tls20.c
@@ -0,0 +1,98 @@
+/* Test dtv setup if entries don't have monotone increasing generation.
+ Copyright (C) 2021 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <dlfcn.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <support/check.h>
+#include <support/xdlfcn.h>
+#include <support/xthread.h>
+
+#define NMOD 100
+static void *mod[NMOD];
+
+static void
+load_fail (void)
+{
+ /* Expected to fail because of a missing symbol. */
+ void *m = dlopen ("tst-tls20mod-bad.so", RTLD_NOW);
+ if (m != NULL)
+ FAIL_EXIT1 ("dlopen of tst-tls20mod-bad.so succeeded\n");
+}
+
+static void
+load_mod (int i)
+{
+ char *buf = xasprintf ("tst-tls-manydynamic%02dmod.so", i);
+ mod[i] = xdlopen (buf, RTLD_LAZY);
+ free (buf);
+}
+
+static void
+unload_mod (int i)
+{
+ if (mod[i] != NULL)
+ xdlclose (mod[i]);
+ mod[i] = NULL;
+}
+
+static void
+access (int i)
+{
+ char *buf = xasprintf ("tls_global_%02d", i);
+ dlerror ();
+ int *p = dlsym (mod[i], buf);
+ printf ("mod[%d]: &tls = %p\n", i, p);
+ if (p == NULL)
+ FAIL_EXIT1 ("dlsym failed: %s\n", dlerror ());
+ ++*p;
+ free (buf);
+}
+
+static void *
+start (void *a)
+{
+ for (int i = 0; i < NMOD; i++)
+ if (mod[i] != NULL)
+ access (i);
+ return 0;
+}
+
+static int
+do_test (void)
+{
+ int i;
+
+ for (i = 0; i < NMOD; i++)
+ {
+ load_mod (i);
+ /* Bump the generation of mod[0] without using new dtv slot. */
+ unload_mod (0);
+ load_fail (); /* Ensure GL(dl_tls_dtv_gaps) is true: see bug 27135. */
+ load_mod (0);
+ /* Access TLS in all loaded modules. */
+ pthread_t t = xpthread_create (0, start, 0);
+ xpthread_join (t);
+ }
+ for (i = 0; i < NMOD; i++)
+ unload_mod (i);
+ return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/elf/tst-tls20mod-bad.c b/elf/tst-tls20mod-bad.c
new file mode 100644
index 0000000000..c1aed8ea7d
--- /dev/null
+++ b/elf/tst-tls20mod-bad.c
@@ -0,0 +1,2 @@
+void missing_symbol (void);
+void f (void) {missing_symbol ();}
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2021-04-15 8:33 [glibc] elf: Add a DTV setup test [BZ #27136] Szabolcs Nagy
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