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It can trigger bug 27136. The test requires large number of modules with TLS so the modules of tst-tls7 are used instead of duplicating them. --- nptl/Makefile | 10 ++++- nptl/tst-tls8.c | 96 ++++++++++++++++++++++++++++++++++++++++++ nptl/tst-tls8mod-bad.c | 2 + 3 files changed, 106 insertions(+), 2 deletions(-) create mode 100644 nptl/tst-tls8.c create mode 100644 nptl/tst-tls8mod-bad.c diff --git a/nptl/Makefile b/nptl/Makefile index 208629876d..a11b598efd 100644 --- a/nptl/Makefile +++ b/nptl/Makefile @@ -354,7 +354,7 @@ LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst tests += tst-cancelx7 tst-cancelx17 tst-cleanupx4 ifeq ($(build-shared),yes) -tests += tst-compat-forwarder tst-audit-threads +tests += tst-compat-forwarder tst-audit-threads tst-tls8 tests-internal += tst-tls3 tst-tls3-malloc tst-tls5 tst-stackguard1 tst-tls7 ifeq ($(have-z-execstack),yes) tests += tst-execstack @@ -371,7 +371,7 @@ modules-names = tst-tls3mod \ tst-execstack-mod \ tst-compat-forwarder-mod tst-audit-threads-mod1 \ tst-audit-threads-mod2 \ - tst-tls7mod tst-tls7mod-dep + tst-tls7mod tst-tls7mod-dep tst-tls8mod-bad extra-test-objs += $(addsuffix .os,$(strip $(modules-names))) \ tst-cleanup4aux.o tst-cleanupx4aux.o $(tst-tls7mod-deps) test-extras += tst-cleanup4aux tst-cleanupx4aux @@ -528,6 +528,12 @@ $(objpfx)tst-tls7mod.so: $(tst-tls7mod-deps:%=$(objpfx)%) $(tst-tls7mod-deps:%=$(objpfx)%): $(objpfx)tst-tls7mod-dep.so cp -f $< $@ +# Reuse tst-tls7mod-dep*.so. +tst-tls8mod-bad.so-no-z-defs = yes +$(objpfx)tst-tls8: $(libdl) $(shared-thread-library) +$(objpfx)tst-tls8.out: $(objpfx)tst-tls8mod-bad.so \ + $(tst-tls7mod-deps:%=$(objpfx)%) + $(objpfx)tst-dlsym1: $(libdl) $(shared-thread-library) ifeq (yes,$(build-shared)) diff --git a/nptl/tst-tls8.c b/nptl/tst-tls8.c new file mode 100644 index 0000000000..be7b64c9be --- /dev/null +++ b/nptl/tst-tls8.c @@ -0,0 +1,96 @@ +/* Test dtv setup if entries don't have monoton 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 + . */ + +#include +#include +#include +#include +#include +#include +#include + +#define NMOD 100 +static void *mod[NMOD]; + +static void +load_fail (void) +{ + /* Expected to fail because of a missing symbol. */ + void *m = dlopen ("tst-tls8mod-bad.so", RTLD_NOW); + if (m != NULL) + FAIL_EXIT1 ("dlopen of tst-tls8mod-bad.so succeeded\n"); +} + +static void +load_mod (int i) +{ + char buf[100]; + sprintf (buf, "tst-tls7mod-dep-%02d.so", i); + mod[i] = xdlopen (buf, RTLD_LAZY); +} + +static void +unload_mod (int i) +{ + if (mod[i]) + xdlclose (mod[i]); + mod[i] = 0; +} + +static void +access (int i) +{ + dlerror (); + int *p = dlsym (mod[i], "x"); + printf ("mod[%d]: &x = %p\n", i, p); + if (p == NULL) + FAIL_EXIT1 ("dlsym failed: %s\n", dlerror ()); + ++*p; +} + +static void * +start (void *a) +{ + for (int i = 0; i < NMOD; i++) + if (mod[i]) + 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 diff --git a/nptl/tst-tls8mod-bad.c b/nptl/tst-tls8mod-bad.c new file mode 100644 index 0000000000..c1aed8ea7d --- /dev/null +++ b/nptl/tst-tls8mod-bad.c @@ -0,0 +1,2 @@ +void missing_symbol (void); +void f (void) {missing_symbol ();}