diff options
Diffstat (limited to 'elf/pldd.c')
| -rw-r--r-- | elf/pldd.c | 344 |
1 files changed, 0 insertions, 344 deletions
diff --git a/elf/pldd.c b/elf/pldd.c deleted file mode 100644 index ddfa88d63b..0000000000 --- a/elf/pldd.c +++ /dev/null @@ -1,344 +0,0 @@ -/* List dynamic shared objects linked into given process. - Copyright (C) 2011-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. - - 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 - <http://www.gnu.org/licenses/>. */ - -#include <alloca.h> -#include <argp.h> -#include <assert.h> -#include <dirent.h> -#include <elf.h> -#include <errno.h> -#include <error.h> -#include <fcntl.h> -#include <libintl.h> -#include <link.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <sys/ptrace.h> -#include <sys/stat.h> -#include <sys/wait.h> -#include <scratch_buffer.h> - -#include <ldsodefs.h> -#include <version.h> - -/* Global variables. */ -extern char *program_invocation_short_name; -#define PACKAGE _libc_intl_domainname - -/* External functions. */ -#include <programs/xmalloc.h> - -/* Name and version of program. */ -static void print_version (FILE *stream, struct argp_state *state); -void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version; - -/* Function to print some extra text in the help message. */ -static char *more_help (int key, const char *text, void *input); - -/* Definitions of arguments for argp functions. */ -static const struct argp_option options[] = -{ - { NULL, 0, NULL, 0, NULL } -}; - -/* Short description of program. */ -static const char doc[] = N_("\ -List dynamic shared objects loaded into process."); - -/* Strings for arguments in help texts. */ -static const char args_doc[] = N_("PID"); - -/* Prototype for option handler. */ -static error_t parse_opt (int key, char *arg, struct argp_state *state); - -/* Data structure to communicate with argp functions. */ -static struct argp argp = -{ - options, parse_opt, args_doc, doc, NULL, more_help, NULL -}; - -// File descriptor of /proc/*/mem file. -static int memfd; - -/* Name of the executable */ -static char *exe; - -/* Local functions. */ -static int get_process_info (int dfd, long int pid); -static void wait_for_ptrace_stop (long int pid); - - -int -main (int argc, char *argv[]) -{ - /* Parse and process arguments. */ - int remaining; - argp_parse (&argp, argc, argv, 0, &remaining, NULL); - - if (remaining != argc - 1) - { - fprintf (stderr, - gettext ("Exactly one parameter with process ID required.\n")); - argp_help (&argp, stderr, ARGP_HELP_SEE, program_invocation_short_name); - return 1; - } - - assert (sizeof (pid_t) == sizeof (int) - || sizeof (pid_t) == sizeof (long int)); - char *endp; - errno = 0; - long int pid = strtol (argv[remaining], &endp, 10); - if (pid < 0 || (pid == ULONG_MAX && errno == ERANGE) || *endp != '\0' - || (sizeof (pid_t) < sizeof (pid) && pid > INT_MAX)) - error (EXIT_FAILURE, 0, gettext ("invalid process ID '%s'"), - argv[remaining]); - - /* Determine the program name. */ - char buf[7 + 3 * sizeof (pid)]; - snprintf (buf, sizeof (buf), "/proc/%lu", pid); - int dfd = open (buf, O_RDONLY | O_DIRECTORY); - if (dfd == -1) - error (EXIT_FAILURE, errno, gettext ("cannot open %s"), buf); - - struct scratch_buffer exebuf; - scratch_buffer_init (&exebuf); - ssize_t nexe; - while ((nexe = readlinkat (dfd, "exe", - exebuf.data, exebuf.length)) == exebuf.length) - { - if (!scratch_buffer_grow (&exebuf)) - { - nexe = -1; - break; - } - } - if (nexe == -1) - exe = (char *) "<program name undetermined>"; - else - { - exe = exebuf.data; - exe[nexe] = '\0'; - } - - /* Stop all threads since otherwise the list of loaded modules might - change while we are reading it. */ - struct thread_list - { - pid_t tid; - struct thread_list *next; - } *thread_list = NULL; - - int taskfd = openat (dfd, "task", O_RDONLY | O_DIRECTORY | O_CLOEXEC); - if (taskfd == 1) - error (EXIT_FAILURE, errno, gettext ("cannot open %s/task"), buf); - DIR *dir = fdopendir (taskfd); - if (dir == NULL) - error (EXIT_FAILURE, errno, gettext ("cannot prepare reading %s/task"), - buf); - - struct dirent64 *d; - while ((d = readdir64 (dir)) != NULL) - { - if (! isdigit (d->d_name[0])) - continue; - - errno = 0; - long int tid = strtol (d->d_name, &endp, 10); - if (tid < 0 || (tid == ULONG_MAX && errno == ERANGE) || *endp != '\0' - || (sizeof (pid_t) < sizeof (pid) && tid > INT_MAX)) - error (EXIT_FAILURE, 0, gettext ("invalid thread ID '%s'"), - d->d_name); - - if (ptrace (PTRACE_ATTACH, tid, NULL, NULL) != 0) - { - /* There might be a race between reading the directory and - threads terminating. Ignore errors attaching to unknown - threads unless this is the main thread. */ - if (errno == ESRCH && tid != pid) - continue; - - error (EXIT_FAILURE, errno, gettext ("cannot attach to process %lu"), - tid); - } - - wait_for_ptrace_stop (tid); - - struct thread_list *newp = alloca (sizeof (*newp)); - newp->tid = tid; - newp->next = thread_list; - thread_list = newp; - } - - closedir (dir); - - int status = get_process_info (dfd, pid); - - assert (thread_list != NULL); - do - { - ptrace (PTRACE_DETACH, thread_list->tid, NULL, NULL); - thread_list = thread_list->next; - } - while (thread_list != NULL); - - close (dfd); - - return status; -} - - -/* Wait for PID to enter ptrace-stop state after being attached. */ -static void -wait_for_ptrace_stop (long int pid) -{ - int status; - - /* While waiting for SIGSTOP being delivered to the tracee we have to - reinject any other pending signal. Ignore all other errors. */ - while (waitpid (pid, &status, __WALL) == pid && WIFSTOPPED (status)) - { - /* The STOP signal should not be delivered to the tracee. */ - if (WSTOPSIG (status) == SIGSTOP) - return; - if (ptrace (PTRACE_CONT, pid, NULL, - (void *) (uintptr_t) WSTOPSIG (status))) - /* The only possible error is that the process died. */ - return; - } -} - - -/* Handle program arguments. */ -static error_t -parse_opt (int key, char *arg, struct argp_state *state) -{ - switch (key) - { - default: - return ARGP_ERR_UNKNOWN; - } - return 0; -} - - -/* Print bug-reporting information in the help message. */ -static char * -more_help (int key, const char *text, void *input) -{ - char *tp = NULL; - switch (key) - { - case ARGP_KEY_HELP_EXTRA: - /* We print some extra information. */ - if (asprintf (&tp, gettext ("\ -For bug reporting instructions, please see:\n\ -%s.\n"), REPORT_BUGS_TO) < 0) - return NULL; - return tp; - default: - break; - } - return (char *) text; -} - -/* Print the version information. */ -static void -print_version (FILE *stream, struct argp_state *state) -{ - fprintf (stream, "pldd %s%s\n", PKGVERSION, VERSION); - fprintf (stream, gettext ("\ -Copyright (C) %s Free Software Foundation, Inc.\n\ -This is free software; see the source for copying conditions. There is NO\n\ -warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\ -"), "2017"); - fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper"); -} - - -#define CLASS 32 -#include "pldd-xx.c" -#define CLASS 64 -#include "pldd-xx.c" - - -static int -get_process_info (int dfd, long int pid) -{ - memfd = openat (dfd, "mem", O_RDONLY); - if (memfd == -1) - goto no_info; - - int fd = openat (dfd, "exe", O_RDONLY); - if (fd == -1) - { - no_info: - error (0, errno, gettext ("cannot get information about process %lu"), - pid); - return EXIT_FAILURE; - } - - char e_ident[EI_NIDENT]; - if (read (fd, e_ident, EI_NIDENT) != EI_NIDENT) - goto no_info; - - close (fd); - - if (memcmp (e_ident, ELFMAG, SELFMAG) != 0) - { - error (0, 0, gettext ("process %lu is no ELF program"), pid); - return EXIT_FAILURE; - } - - fd = openat (dfd, "auxv", O_RDONLY); - if (fd == -1) - goto no_info; - - size_t auxv_size = 0; - void *auxv = NULL; - while (1) - { - auxv_size += 512; - auxv = xrealloc (auxv, auxv_size); - - ssize_t n = pread (fd, auxv, auxv_size, 0); - if (n < 0) - goto no_info; - if (n < auxv_size) - { - auxv_size = n; - break; - } - } - - close (fd); - - int retval; - if (e_ident[EI_CLASS] == ELFCLASS32) - retval = find_maps32 (pid, auxv, auxv_size); - else - retval = find_maps64 (pid, auxv, auxv_size); - - free (auxv); - close (memfd); - - return retval; -} |