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https://sourceware.org/git/glibc.git
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5d72e7e41a
Starting with commit 1bcfe0f732, the
test was enhanced and the object for __builtin_return_address (0)
is searched with _dl_find_object.
Unfortunately on e.g. s390 (31bit), a postprocessing step is needed
as the highest bit has to be masked out. This can be done with
__builtin_extract_return_addr.
Without this postprocessing, _dl_find_object returns with -1 and the
content of dlfo is invalid, which may lead to segfaults in basename.
Therefore those checks are now only done on success.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/* Check the usability of <dlfcn.h> functions in audit modules. Audit module.
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Copyright (C) 2022-2023 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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<https://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <first-versions.h>
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#include <gnu/lib-names.h>
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#include <link.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <support/check.h>
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#include <support/xdlfcn.h>
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unsigned int
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la_version (unsigned int current)
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{
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/* Exercise various <dlfcn.h> functions. */
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/* Check dlopen, dlsym, dlclose. */
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void *handle = xdlopen (LIBM_SO, RTLD_LOCAL | RTLD_NOW);
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void *ptr = xdlsym (handle, "sincos");
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TEST_VERIFY (ptr != NULL);
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ptr = dlsym (handle, "SINCOS");
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TEST_VERIFY (ptr == NULL);
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const char *message = dlerror ();
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TEST_VERIFY (strstr (message, ": undefined symbol: SINCOS") != NULL);
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ptr = dlsym (handle, "SINCOS");
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TEST_VERIFY (ptr == NULL);
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xdlclose (handle);
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TEST_COMPARE_STRING (dlerror (), NULL);
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handle = xdlopen (LIBC_SO, RTLD_LOCAL | RTLD_NOW | RTLD_NOLOAD);
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/* Check dlvsym. _exit is unlikely to gain another symbol
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version. */
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TEST_VERIFY (xdlsym (handle, "_exit")
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== xdlvsym (handle, "_exit", FIRST_VERSION_libc__exit_STRING));
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/* Check dlinfo. */
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{
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void *handle2 = NULL;
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TEST_COMPARE (dlinfo (handle, RTLD_DI_LINKMAP, &handle2), 0);
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TEST_VERIFY (handle2 == handle);
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}
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/* Check dladdr and dladdr1. */
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Dl_info info = { };
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TEST_VERIFY (dladdr (&_exit, &info) != 0);
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if (strcmp (info.dli_sname, "_Exit") != 0) /* _Exit is an alias. */
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TEST_COMPARE_STRING (info.dli_sname, "_exit");
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TEST_VERIFY (info.dli_saddr == &_exit);
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TEST_VERIFY (strstr (info.dli_fname, LIBC_SO));
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void *extra_info;
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memset (&info, 0, sizeof (info));
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TEST_VERIFY (dladdr1 (&_exit, &info, &extra_info, RTLD_DL_LINKMAP) != 0);
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TEST_VERIFY (extra_info == handle);
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/* Check _dl_find_object. */
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struct dl_find_object dlfo;
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void *ret_addr = __builtin_extract_return_addr (__builtin_return_address (0));
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int ret_dl_find_object =_dl_find_object (ret_addr, &dlfo);
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TEST_COMPARE (ret_dl_find_object, 0);
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if (ret_dl_find_object == 0)
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{
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/* "ld.so" is seen with --enable-hardcoded-path-in-tests. */
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if (strcmp (basename (dlfo.dlfo_link_map->l_name), "ld.so") != 0)
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TEST_COMPARE_STRING (basename (dlfo.dlfo_link_map->l_name), LD_SO);
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}
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ret_dl_find_object = _dl_find_object (dlsym (handle, "environ"), &dlfo);
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TEST_COMPARE (ret_dl_find_object, 0);
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if (ret_dl_find_object == 0)
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TEST_COMPARE_STRING (basename (dlfo.dlfo_link_map->l_name), LIBC_SO);
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TEST_COMPARE (_dl_find_object ((void *) 1, &dlfo), -1);
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TEST_COMPARE (_dl_find_object ((void *) -1, &dlfo), -1);
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/* Verify that dlmopen creates a new namespace. */
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void *dlmopen_handle = xdlmopen (LM_ID_NEWLM, LIBC_SO, RTLD_NOW);
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TEST_VERIFY (dlmopen_handle != handle);
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memset (&info, 0, sizeof (info));
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extra_info = NULL;
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ptr = xdlsym (dlmopen_handle, "_exit");
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TEST_VERIFY (dladdr1 (ptr, &info, &extra_info, RTLD_DL_LINKMAP) != 0);
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TEST_VERIFY (extra_info == dlmopen_handle);
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xdlclose (dlmopen_handle);
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/* Terminate the process with an error state. This does not happen
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automatically because the audit module state is not shared with
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the main program. */
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if (support_record_failure_is_failed ())
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{
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fflush (stdout);
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fflush (stderr);
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_exit (1);
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}
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return LAV_CURRENT;
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}
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char *
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la_objsearch (const char *name, uintptr_t *cookie, unsigned int flag)
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{
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if (strcmp (name, "mapped to libc") == 0)
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return (char *) LIBC_SO;
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else
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return (char *) name;
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}
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