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/* Basic tests for pldd program.
Copyright (C) 2019-2025 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
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <stdbool.h>
#include <array_length.h>
#include <gnu/lib-names.h>
#include <support/subprocess.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xptrace.h>
#include <support/xunistd.h>
#include <sys/mman.h>
#include <errno.h>
#include <signal.h>
static void
target_process (void *arg)
{
pause ();
}
static void
pldd_process (void *arg)
{
pid_t *target_pid_ptr = (pid_t *) arg;
/* Create a copy of current test to check with pldd. As the
target_process is a child of this pldd_process, pldd is also able
to attach to target_process if YAMA is configured to 1 =
"restricted ptrace". */
struct support_subprocess target = support_subprocess (target_process, NULL);
/* Store the pid of target-process as do_test needs it in order to
e.g. terminate it at end of the test. */
*target_pid_ptr = target.pid;
/* Three digits per byte plus null terminator. */
char pid[3 * sizeof (uint32_t) + 1];
snprintf (pid, array_length (pid), "%d", target.pid);
char *prog = xasprintf ("%s/pldd", support_bindir_prefix);
/* Run pldd and use the pid of target_process as argument. */
execve (prog, (char *const []) { (char *) prog, pid, NULL },
(char *const []) { NULL });
FAIL_EXIT1 ("Returned from execve: errno=%d=%m\n", errno);
}
/* The test runs in a container because pldd does not support tracing
a binary started by the loader itself (as with testrun.sh). */
static bool
in_str_list (const char *libname, const char *const strlist[])
{
for (const char *const *str = strlist; *str != NULL; str++)
if (strcmp (libname, *str) == 0)
return true;
return false;
}
static int
do_test (void)
{
support_need_proc ("needs /proc/sys/kernel/yama/ptrace_scope and /proc/$child");
/* Check if our subprocess can be debugged with ptrace. */
{
int ptrace_scope = support_ptrace_scope ();
if (ptrace_scope >= 2)
FAIL_UNSUPPORTED ("/proc/sys/kernel/yama/ptrace_scope >= 2");
}
pid_t *target_pid_ptr = (pid_t *) xmmap (NULL, sizeof (pid_t),
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1);
/* Run 'pldd' on test subprocess which will be created in pldd_process.
The pid of the subprocess will be written to target_pid_ptr. */
struct support_capture_subprocess pldd;
pldd = support_capture_subprocess (pldd_process, target_pid_ptr);
support_capture_subprocess_check (&pldd, "pldd", 0, sc_allow_stdout);
/* Check 'pldd' output. The test is expected to be linked against only
loader and libc. */
{
pid_t pid;
#define BUFFERLEN 511
char buffer[BUFFERLEN + 1];
#define STRINPUT(size) XSTRINPUT(size)
#define XSTRINPUT(size) "%" # size "s"
FILE *out = fmemopen (pldd.out.buffer, pldd.out.length, "r");
TEST_VERIFY (out != NULL);
/* First line is in the form of <pid>: <full path of executable> */
TEST_COMPARE (fscanf (out, "%u: " STRINPUT (BUFFERLEN), &pid, buffer), 2);
TEST_COMPARE (pid, *target_pid_ptr);
TEST_COMPARE (strcmp (basename (buffer), "tst-pldd"), 0);
/* It expects only one loader and libc loaded by the program. */
bool interpreter_found = false, libc_found = false;
while (fgets (buffer, array_length (buffer), out) != NULL)
{
/* Ignore vDSO. */
if (buffer[0] != '/')
continue;
/* Remove newline so baseline (buffer) can compare against the
LD_SO and LIBC_SO macros unmodified. */
if (buffer[strlen(buffer)-1] == '\n')
buffer[strlen(buffer)-1] = '\0';
const char *libname = basename (buffer);
/* It checks for default names in case of build configure with
--enable-hardcoded-path-in-tests (BZ #24506). */
if (in_str_list (libname,
(const char *const []) { "ld.so", LD_SO, NULL }))
{
TEST_COMPARE (interpreter_found, false);
interpreter_found = true;
continue;
}
if (in_str_list (libname,
(const char *const []) { "libc.so", LIBC_SO, NULL }))
{
TEST_COMPARE (libc_found, false);
libc_found = true;
continue;
}
}
TEST_COMPARE (interpreter_found, true);
TEST_COMPARE (libc_found, true);
fclose (out);
}
support_capture_subprocess_free (&pldd);
if (kill (*target_pid_ptr, SIGKILL) != 0)
FAIL_EXIT1 ("Unable to kill target_process: errno=%d=%m\n", errno);
xmunmap (target_pid_ptr, sizeof (pid_t));
return 0;
}
#include <support/test-driver.c>
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