From 7862ff8e699ca8f605b832c6e529f5b10e678edd Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Fri, 21 May 2021 22:35:00 +0200 Subject: elf: Use custom NODELETE DSO for tst-dlopenfail, tst-dlopenfail-2 Once libpthread is empty and no longer marked NODELETE, it no longer can be used for testing. Reviewed-by: Adhemerval Zanella --- elf/Makefile | 11 +++++++++-- elf/tst-dlopenfail-2.c | 5 +---- elf/tst-dlopenfail.c | 46 ++++++++++++++++++-------------------------- elf/tst-dlopenfailmod2.c | 6 +++--- elf/tst-dlopenfailnodelmod.c | 29 ++++++++++++++++++++++++++++ 5 files changed, 61 insertions(+), 36 deletions(-) create mode 100644 elf/tst-dlopenfailnodelmod.c diff --git a/elf/Makefile b/elf/Makefile index 5e809db..834ec85 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -334,7 +334,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \ tst-auditmanymod7 tst-auditmanymod8 tst-auditmanymod9 \ tst-initlazyfailmod tst-finilazyfailmod \ tst-dlopenfailmod1 tst-dlopenfaillinkmod tst-dlopenfailmod2 \ - tst-dlopenfailmod3 tst-ldconfig-ld-mod \ + tst-dlopenfailmod3 tst-dlopenfailnodelmod tst-ldconfig-ld-mod \ tst-filterobj-flt tst-filterobj-aux tst-filterobj-filtee \ tst-auditlogmod-1 tst-auditlogmod-2 tst-auditlogmod-3 \ tst-single_threaded-mod1 tst-single_threaded-mod2 \ @@ -1733,11 +1733,18 @@ LDFLAGS-tst-dlopenfailmod1.so = -Wl,--no-as-needed $(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-dlopenfailmod2.so: $(objpfx)tst-dlopenfailnodelmod.so $(objpfx)tst-dlopenfail-2: $(libdl) $(objpfx)tst-dlopenfail-2.out: \ $(objpfx)tst-dlopenfailmod1.so $(objpfx)tst-dlopenfailmod2.so \ $(objpfx)tst-dlopenfailmod3.so +# tst-dlopenfailnodelmod.so emulates how libpthread was linked. +$(objpfx)tst-dlopenfailnodelmod.so: $(libsupport) +LDFLAGS-tst-dlopenfailnodelmod.so = \ + -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst +# tst-dlopenfail should export the libsupport symbols, so that +# tst-dlopenfailnodelmod.so uses them for error reporting. +LDFLAGS-tst-dlopenfail = -Wl,-E $(objpfx)tst-dlopen-nodelete-reloc: $(libdl) $(objpfx)tst-dlopen-nodelete-reloc.out: \ diff --git a/elf/tst-dlopenfail-2.c b/elf/tst-dlopenfail-2.c index 50eed81..168c4b2 100644 --- a/elf/tst-dlopenfail-2.c +++ b/elf/tst-dlopenfail-2.c @@ -28,10 +28,7 @@ static int do_test (void) { - /* This test uses libpthread as the canonical NODELETE module. If - libpthread is no longer NODELETE because it has been merged into - libc, the test needs to be updated. */ - TEST_VERIFY (dlsym (NULL, "pthread_create") == NULL); + TEST_VERIFY (dlsym (NULL, "no_delete_mod_function") == NULL); /* This is expected to fail because of the missing dependency. */ puts ("info: attempting to load tst-dlopenfailmod1.so"); diff --git a/elf/tst-dlopenfail.c b/elf/tst-dlopenfail.c index db2b41f..edf84e8 100644 --- a/elf/tst-dlopenfail.c +++ b/elf/tst-dlopenfail.c @@ -18,7 +18,6 @@ #include #include -#include #include #include #include @@ -28,10 +27,7 @@ static int do_test (void) { - /* This test uses libpthread as the canonical NODELETE module. If - libpthread is no longer NODELETE because it has been merged into - libc, the test needs to be updated. */ - TEST_VERIFY (dlsym (NULL, "pthread_create") == NULL); + TEST_VERIFY (dlsym (NULL, "no_delete_mod_function") == NULL); /* This is expected to fail because of the missing dependency. */ puts ("info: attempting to load tst-dlopenfailmod1.so"); @@ -42,36 +38,32 @@ do_test (void) " cannot open shared object file:" " No such file or directory"); - /* Do not probe for the presence of libpthread at this point because - that might trigger relocation if bug 20839 is present, obscuring - a subsequent crash. */ + /* Do not probe for the presence of the tst-dlopenfailnodelmod.so at + this point because that might trigger relocation if bug 20839 is + present, obscuring a subsequent crash. */ /* This is expected to succeed. */ puts ("info: loading tst-dlopenfailmod2.so"); void *handle = xdlopen ("tst-dlopenfailmod2.so", RTLD_NOW); xdlclose (handle); - /* libpthread should remain loaded. */ - TEST_VERIFY (dlopen (LIBPTHREAD_SO, RTLD_LAZY | RTLD_NOLOAD) != NULL); - TEST_VERIFY (dlsym (NULL, "pthread_create") == NULL); + /* The NODELETE module should remain loaded. */ + TEST_VERIFY (dlopen ("tst-dlopenfailnodelmod.so", RTLD_LAZY | RTLD_NOLOAD) + != NULL); + /* But the symbol is not in the global scope. */ + TEST_VERIFY (dlsym (NULL, "no_delete_mod_function") == NULL); - /* We can make libpthread global, and then the symbol should become - available. */ - TEST_VERIFY (dlopen (LIBPTHREAD_SO, RTLD_LAZY | RTLD_GLOBAL) != NULL); - TEST_VERIFY (dlsym (NULL, "pthread_create") != NULL); + /* We can make tst-dlopenfailnodelmod.so global, and then the symbol + should become available. */ + TEST_VERIFY (dlopen ("tst-dlopenfailnodelmod.so", RTLD_LAZY | RTLD_GLOBAL) + != NULL); + void (*no_delete_mod_function) (void) + = dlsym (NULL, "no_delete_mod_function"); + TEST_VERIFY_EXIT (no_delete_mod_function != NULL); - /* sem_open is sufficiently complex to depend on relocations. */ - void *(*sem_open_ptr) (const char *, int flag, ...) - = dlsym (NULL, "sem_open"); - if (sem_open_ptr == NULL) - /* Hurd does not implement sem_open. */ - puts ("warning: sem_open not found, further testing not possible"); - else - { - errno = 0; - TEST_VERIFY (sem_open_ptr ("/", 0) == NULL); - TEST_COMPARE (errno, EINVAL); - } + /* Hopefully, no_delete_mod_function is sufficiently complex to + depend on relocations. */ + no_delete_mod_function (); return 0; } diff --git a/elf/tst-dlopenfailmod2.c b/elf/tst-dlopenfailmod2.c index cd6f9cf..ed353f9 100644 --- a/elf/tst-dlopenfailmod2.c +++ b/elf/tst-dlopenfailmod2.c @@ -16,11 +16,11 @@ License along with the GNU C Library; if not, see . */ -#include #include -/* Force linking against libpthread. */ -void *pthread_create_reference = pthread_create; +/* Force linking against tst-dlopenfailnodelmod.so. */ +void no_delete_mod_function (void); +void *function_reference = no_delete_mod_function; static void __attribute__ ((constructor)) init (void) diff --git a/elf/tst-dlopenfailnodelmod.c b/elf/tst-dlopenfailnodelmod.c new file mode 100644 index 0000000..c4347b7 --- /dev/null +++ b/elf/tst-dlopenfailnodelmod.c @@ -0,0 +1,29 @@ +/* NODELETE module for tst-dlopenfail, tst-dlopenfail-2. + 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 + +/* Introduce some relocation dependencies. */ +const char test_string[] = "test string"; +const char *test_string_ptr = test_string; + +void +no_delete_mod_function (void) +{ + TEST_COMPARE_STRING (test_string, test_string_ptr); +} -- cgit v1.1