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bc56ab1f4a
When audit modules are loaded, ld.so initialization is not yet complete, and rtld_active () returns false even though ld.so is mostly working. Instead, the static dlopen hook is used, but that does not work at all because this is not a static dlopen situation. Commit466c1ea15f("dlfcn: Rework static dlopen hooks") moved the hook pointer into _rtld_global_ro, which means that separate protection is not needed anymore and the hook pointer can be checked directly. The guard for disabling libio vtable hardening in _IO_vtable_check should stay for now. Fixes commit8e1472d2c1("ld.so: Examine GLRO to detect inactive loader [BZ #20204]"). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> (cherry picked from commit8dcb6d0af0)
105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/* Check the usability of <dlfcn.h> functions in audit modules. Audit module.
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Copyright (C) 2022 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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/* 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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