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91c2e6c3db
The information is theoretically available via dl_iterate_phdr as
well, but that approach is very slow if there are many shared
objects.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@rehdat.com>
(cherry picked from commit d056c21213)
126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/* Test for dlinfo (RTLD_DI_PHDR).
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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 <link.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/auxv.h>
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#include <support/check.h>
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#include <support/xdlfcn.h>
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/* Used to verify that the program header array appears as expected
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among the dl_iterate_phdr callback invocations. */
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struct dlip_callback_args
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{
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struct link_map *l; /* l->l_addr is used to find the object. */
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const ElfW(Phdr) *phdr; /* Expected program header pointed. */
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int phnum; /* Expected program header count. */
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bool found; /* True if l->l_addr has been found. */
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};
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static int
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dlip_callback (struct dl_phdr_info *dlpi, size_t size, void *closure)
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{
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TEST_COMPARE (sizeof (*dlpi), size);
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struct dlip_callback_args *args = closure;
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if (dlpi->dlpi_addr == args->l->l_addr)
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{
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TEST_VERIFY (!args->found);
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args->found = true;
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TEST_VERIFY (args->phdr == dlpi->dlpi_phdr);
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TEST_COMPARE (args->phnum, dlpi->dlpi_phnum);
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}
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return 0;
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}
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static int
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do_test (void)
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{
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/* Avoid a copy relocation. */
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struct r_debug *debug = xdlsym (RTLD_DEFAULT, "_r_debug");
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struct link_map *l = (struct link_map *) debug->r_map;
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TEST_VERIFY_EXIT (l != NULL);
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do
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{
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printf ("info: checking link map %p (%p) for \"%s\"\n",
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l, l->l_phdr, l->l_name);
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/* Cause dlerror () to return an error message. */
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dlsym (RTLD_DEFAULT, "does-not-exist");
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/* Use the extension that link maps are valid dlopen handles. */
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const ElfW(Phdr) *phdr;
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int phnum = dlinfo (l, RTLD_DI_PHDR, &phdr);
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TEST_VERIFY (phnum >= 0);
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/* Verify that the error message has been cleared. */
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TEST_COMPARE_STRING (dlerror (), NULL);
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TEST_VERIFY (phdr == l->l_phdr);
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TEST_COMPARE (phnum, l->l_phnum);
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/* Check that we can find PT_DYNAMIC among the array. */
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{
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bool dynamic_found = false;
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for (int i = 0; i < phnum; ++i)
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if (phdr[i].p_type == PT_DYNAMIC)
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{
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dynamic_found = true;
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TEST_COMPARE ((ElfW(Addr)) l->l_ld, l->l_addr + phdr[i].p_vaddr);
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}
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TEST_VERIFY (dynamic_found);
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}
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/* Check that dl_iterate_phdr finds the link map with the same
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program headers. */
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{
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struct dlip_callback_args args =
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{
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.l = l,
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.phdr = phdr,
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.phnum = phnum,
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.found = false,
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};
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TEST_COMPARE (dl_iterate_phdr (dlip_callback, &args), 0);
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TEST_VERIFY (args.found);
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}
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if (l->l_prev == NULL)
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{
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/* This is the executable, so the information is also
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available via getauxval. */
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TEST_COMPARE_STRING (l->l_name, "");
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TEST_VERIFY (phdr == (const ElfW(Phdr) *) getauxval (AT_PHDR));
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TEST_COMPARE (phnum, getauxval (AT_PHNUM));
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}
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l = l->l_next;
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}
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while (l != NULL);
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return 0;
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}
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#include <support/test-driver.c>
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