340 lines
8.7 KiB
C
340 lines
8.7 KiB
C
/* List dynamic shared objects linked into given process.
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Copyright (C) 2011-2022 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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#define _FILE_OFFSET_BITS 64
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#include <argp.h>
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#include <dirent.h>
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#include <error.h>
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#include <fcntl.h>
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#include <libintl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#include <scratch_buffer.h>
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#include <ldsodefs.h>
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#include <version.h>
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/* Global variables. */
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extern char *program_invocation_short_name;
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#define PACKAGE _libc_intl_domainname
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/* External functions. */
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#include <programs/xmalloc.h>
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/* Name and version of program. */
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static void print_version (FILE *stream, struct argp_state *state);
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void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
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/* Function to print some extra text in the help message. */
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static char *more_help (int key, const char *text, void *input);
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/* Definitions of arguments for argp functions. */
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static const struct argp_option options[] =
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{
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{ NULL, 0, NULL, 0, NULL }
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};
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/* Short description of program. */
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static const char doc[] = N_("\
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List dynamic shared objects loaded into process.");
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/* Strings for arguments in help texts. */
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static const char args_doc[] = N_("PID");
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/* Prototype for option handler. */
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static error_t parse_opt (int key, char *arg, struct argp_state *state);
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/* Data structure to communicate with argp functions. */
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static struct argp argp =
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{
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options, parse_opt, args_doc, doc, NULL, more_help, NULL
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};
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/* Local functions. */
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static int get_process_info (const char *exe, int dfd, long int pid);
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static void wait_for_ptrace_stop (long int pid);
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int
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main (int argc, char *argv[])
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{
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/* Parse and process arguments. */
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int remaining;
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argp_parse (&argp, argc, argv, 0, &remaining, NULL);
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if (remaining != argc - 1)
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{
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fprintf (stderr,
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gettext ("Exactly one parameter with process ID required.\n"));
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argp_help (&argp, stderr, ARGP_HELP_SEE, program_invocation_short_name);
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return 1;
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}
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_Static_assert (sizeof (pid_t) == sizeof (int)
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|| sizeof (pid_t) == sizeof (long int),
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"sizeof (pid_t) != sizeof (int) or sizeof (long int)");
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char *endp;
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errno = 0;
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long int pid = strtol (argv[remaining], &endp, 10);
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if (pid < 0 || (pid == ULONG_MAX && errno == ERANGE) || *endp != '\0'
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|| (sizeof (pid_t) < sizeof (pid) && pid > INT_MAX))
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error (EXIT_FAILURE, 0, gettext ("invalid process ID '%s'"),
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argv[remaining]);
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/* Determine the program name. */
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char buf[7 + 3 * sizeof (pid)];
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snprintf (buf, sizeof (buf), "/proc/%lu", pid);
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int dfd = open (buf, O_RDONLY | O_DIRECTORY);
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if (dfd == -1)
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error (EXIT_FAILURE, errno, gettext ("cannot open %s"), buf);
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/* Name of the executable */
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struct scratch_buffer exe;
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scratch_buffer_init (&exe);
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ssize_t nexe;
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while ((nexe = readlinkat (dfd, "exe",
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exe.data, exe.length)) == exe.length)
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{
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if (!scratch_buffer_grow (&exe))
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{
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nexe = -1;
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break;
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}
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}
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if (nexe == -1)
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/* Default stack allocation is at least 1024. */
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snprintf (exe.data, exe.length, "<program name undetermined>");
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else
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((char*)exe.data)[nexe] = '\0';
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/* Stop all threads since otherwise the list of loaded modules might
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change while we are reading it. */
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struct thread_list
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{
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pid_t tid;
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struct thread_list *next;
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} *thread_list = NULL;
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int taskfd = openat (dfd, "task", O_RDONLY | O_DIRECTORY | O_CLOEXEC);
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if (taskfd == 1)
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error (EXIT_FAILURE, errno, gettext ("cannot open %s/task"), buf);
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DIR *dir = fdopendir (taskfd);
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if (dir == NULL)
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error (EXIT_FAILURE, errno, gettext ("cannot prepare reading %s/task"),
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buf);
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struct dirent *d;
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while ((d = readdir (dir)) != NULL)
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{
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if (! isdigit (d->d_name[0]))
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continue;
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errno = 0;
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long int tid = strtol (d->d_name, &endp, 10);
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if (tid < 0 || (tid == ULONG_MAX && errno == ERANGE) || *endp != '\0'
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|| (sizeof (pid_t) < sizeof (pid) && tid > INT_MAX))
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error (EXIT_FAILURE, 0, gettext ("invalid thread ID '%s'"),
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d->d_name);
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if (ptrace (PTRACE_ATTACH, tid, NULL, NULL) != 0)
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{
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/* There might be a race between reading the directory and
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threads terminating. Ignore errors attaching to unknown
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threads unless this is the main thread. */
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if (errno == ESRCH && tid != pid)
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continue;
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error (EXIT_FAILURE, errno, gettext ("cannot attach to process %lu"),
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tid);
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}
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wait_for_ptrace_stop (tid);
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struct thread_list *newp = xmalloc (sizeof (*newp));
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newp->tid = tid;
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newp->next = thread_list;
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thread_list = newp;
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}
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closedir (dir);
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if (thread_list == NULL)
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error (EXIT_FAILURE, 0, gettext ("no valid %s/task entries"), buf);
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int status = get_process_info (exe.data, dfd, pid);
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do
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{
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ptrace (PTRACE_DETACH, thread_list->tid, NULL, NULL);
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struct thread_list *prev = thread_list;
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thread_list = thread_list->next;
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free (prev);
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}
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while (thread_list != NULL);
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close (dfd);
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scratch_buffer_free (&exe);
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return status;
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}
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/* Wait for PID to enter ptrace-stop state after being attached. */
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static void
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wait_for_ptrace_stop (long int pid)
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{
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int status;
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/* While waiting for SIGSTOP being delivered to the tracee we have to
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reinject any other pending signal. Ignore all other errors. */
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while (waitpid (pid, &status, __WALL) == pid && WIFSTOPPED (status))
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{
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/* The STOP signal should not be delivered to the tracee. */
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if (WSTOPSIG (status) == SIGSTOP)
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return;
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if (ptrace (PTRACE_CONT, pid, NULL,
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(void *) (uintptr_t) WSTOPSIG (status)))
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/* The only possible error is that the process died. */
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return;
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}
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}
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/* Handle program arguments. */
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static error_t
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parse_opt (int key, char *arg, struct argp_state *state)
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{
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switch (key)
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{
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default:
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return ARGP_ERR_UNKNOWN;
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}
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return 0;
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}
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/* Print bug-reporting information in the help message. */
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static char *
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more_help (int key, const char *text, void *input)
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{
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char *tp = NULL;
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switch (key)
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{
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case ARGP_KEY_HELP_EXTRA:
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/* We print some extra information. */
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if (asprintf (&tp, gettext ("\
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For bug reporting instructions, please see:\n\
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%s.\n"), REPORT_BUGS_TO) < 0)
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return NULL;
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return tp;
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default:
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break;
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}
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return (char *) text;
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}
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/* Print the version information. */
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static void
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print_version (FILE *stream, struct argp_state *state)
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{
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fprintf (stream, "pldd %s%s\n", PKGVERSION, VERSION);
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fprintf (stream, gettext ("\
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Copyright (C) %s Free Software Foundation, Inc.\n\
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This is free software; see the source for copying conditions. There is NO\n\
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
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"), "2022");
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fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
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}
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#define CLASS 32
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#include "pldd-xx.c"
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#define CLASS 64
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#include "pldd-xx.c"
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static int
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get_process_info (const char *exe, int dfd, long int pid)
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{
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/* File descriptor of /proc/<pid>/mem file. */
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int memfd = openat (dfd, "mem", O_RDONLY);
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if (memfd == -1)
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goto no_info;
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int fd = openat (dfd, "exe", O_RDONLY);
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if (fd == -1)
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{
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no_info:
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error (0, errno, gettext ("cannot get information about process %lu"),
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pid);
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return EXIT_FAILURE;
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}
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char e_ident[EI_NIDENT];
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if (read (fd, e_ident, EI_NIDENT) != EI_NIDENT)
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goto no_info;
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close (fd);
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if (memcmp (e_ident, ELFMAG, SELFMAG) != 0)
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{
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error (0, 0, gettext ("process %lu is no ELF program"), pid);
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return EXIT_FAILURE;
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}
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fd = openat (dfd, "auxv", O_RDONLY);
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if (fd == -1)
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goto no_info;
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size_t auxv_size = 0;
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void *auxv = NULL;
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while (1)
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{
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auxv_size += 512;
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auxv = xrealloc (auxv, auxv_size);
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ssize_t n = pread (fd, auxv, auxv_size, 0);
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if (n < 0)
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goto no_info;
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if (n < auxv_size)
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{
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auxv_size = n;
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break;
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}
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}
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close (fd);
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int retval;
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if (e_ident[EI_CLASS] == ELFCLASS32)
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retval = find_maps32 (exe, memfd, pid, auxv, auxv_size);
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else
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retval = find_maps64 (exe, memfd, pid, auxv, auxv_size);
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free (auxv);
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close (memfd);
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return retval;
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}
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