diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/Makefile | 4 | ||||
| -rw-r--r-- | elf/dl-lookup.c | 1 | ||||
| -rw-r--r-- | elf/tst-dlsym-error.c | 113 |
3 files changed, 116 insertions, 2 deletions
diff --git a/elf/Makefile b/elf/Makefile index 7b6d6d712c..bb23d93890 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -149,7 +149,7 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \ tst-nodelete) \ tst-initorder tst-initorder2 tst-relsort1 tst-null-argv \ tst-ptrguard1 tst-tlsalign tst-tlsalign-extern tst-nodelete-opened \ - tst-nodelete2 tst-audit11 tst-audit12 + tst-nodelete2 tst-audit11 tst-audit12 tst-dlsym-error # reldep9 ifeq ($(build-hardcoded-path-in-tests),yes) tests += tst-dlopen-aout @@ -1257,3 +1257,5 @@ $(objpfx)tst-prelink-cmp.out: tst-prelink.exp \ $(objpfx)tst-ldconfig-X.out : tst-ldconfig-X.sh $(objpfx)ldconfig $(SHELL) $< '$(common-objpfx)' '$(test-wrapper)' '$(test-wrapper-env)' > $@; \ $(evaluate-test) + +$(objpfx)tst-dlsym-error: $(libdl) diff --git a/elf/dl-lookup.c b/elf/dl-lookup.c index f577759a9d..6d299c1097 100644 --- a/elf/dl-lookup.c +++ b/elf/dl-lookup.c @@ -858,7 +858,6 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map, if (__glibc_unlikely (current_value.s == NULL)) { if ((*ref == NULL || ELFW(ST_BIND) ((*ref)->st_info) != STB_WEAK) - && skip_map == NULL && !(GLRO(dl_debug_mask) & DL_DEBUG_UNUSED)) { /* We could find no value for a strong reference. */ diff --git a/elf/tst-dlsym-error.c b/elf/tst-dlsym-error.c new file mode 100644 index 0000000000..11b035881d --- /dev/null +++ b/elf/tst-dlsym-error.c @@ -0,0 +1,113 @@ +/* Test error reporting for dlsym, dlvsym failures. + Copyright (C) 2016 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 <gnu/lib-names.h> +#include <stdio.h> +#include <stdlib.h> + +/* Used to disambiguate symbol names. */ +static int counter; + +static void +test_one (void *handle, const char *name, void *(func) (void *, const char *), + const char *suffix) +{ + ++counter; + char symbol[32]; + snprintf (symbol, sizeof (symbol), "no_such_symbol_%d", counter); + char *expected_message; + if (asprintf (&expected_message, ": undefined symbol: %s%s", + symbol, suffix) < 0) + { + printf ("error: asprintf: %m\n"); + abort (); + } + + void *addr = func (handle, symbol); + if (addr != NULL) + { + printf ("error: %s: found symbol \"no_such_symbol\"\n", name); + abort (); + } + const char *message = dlerror (); + if (message == NULL) + { + printf ("error: %s: missing error message\n", name); + abort (); + } + const char *message_without_path = strchrnul (message, ':'); + if (strcmp (message_without_path, expected_message) != 0) + { + printf ("error: %s: unexpected error message: %s\n", name, message); + abort (); + } + free (expected_message); + + message = dlerror (); + if (message != NULL) + { + printf ("error: %s: unexpected error message: %s\n", name, message); + abort (); + } +} + +static void +test_handles (const char *name, void *(func) (void *, const char *), + const char *suffix) +{ + test_one (RTLD_DEFAULT, name, func, suffix); + test_one (RTLD_NEXT, name, func, suffix); + + void *handle = dlopen (LIBC_SO, RTLD_LAZY); + if (handle == NULL) + { + printf ("error: cannot dlopen %s: %s\n", LIBC_SO, dlerror ()); + abort (); + } + test_one (handle, name, func, suffix); + dlclose (handle); +} + +static void * +dlvsym_no_such_version (void *handle, const char *name) +{ + return dlvsym (handle, name, "NO_SUCH_VERSION"); +} + +static void * +dlvsym_glibc_private (void *handle, const char *name) +{ + return dlvsym (handle, name, "GLIBC_PRIVATE"); +} + +static int +do_test (void) +{ + test_handles ("dlsym", dlsym, ""); + test_handles ("dlvsym", dlvsym_no_such_version, + ", version NO_SUCH_VERSION"); + test_handles ("dlvsym", dlvsym_glibc_private, + ", version GLIBC_PRIVATE"); + + return 0; +} + + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" |