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/******************************************************************************/
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/* THE BEER-WARE LICENSE (Revision 42): */
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/* As long as you retain this notice you can do whatever you want with this */
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/* stuff. If we meet some day, and you think this stuff is worth it, */
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/* you can buy me a beer in return. Ned Ludd. --solarx */
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/******************************************************************************/
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/*
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* normal compile.
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* cc -o pspax pspax.c
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* or with libcap.
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* cc -o pspax pspax.c -DWANT_SYSCAP -lcap
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*/
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static const char rcsid[] = "$Id: pspax.c,v 1.49 2010/12/08 01:24:01 vapier Exp $";
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const char argv0[] = "pspax";
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#include "paxinc.h"
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#include <grp.h>
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#ifdef WANT_SYSCAP
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# undef _POSIX_SOURCE
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# include <sys/capability.h>
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# define WRAP_SYSCAP(x) x
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#else
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# define WRAP_SYSCAP(x)
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#endif
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#define PROC_DIR "/proc"
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/* variables to control behavior */
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static char show_all = 0;
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static char verbose = 0;
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static char show_banner = 1;
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static char show_phdr = 0;
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static char show_addr = 0;
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static char noexec = 1;
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static char writeexec = 1;
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static char wide_output = 0;
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static pid_t show_pid = 0;
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static uid_t show_uid = -1;
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static gid_t show_gid = -1;
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static FILE *proc_fopen(pid_t pid, const char *file)
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{
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char path[__PAX_UTILS_PATH_MAX];
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snprintf(path, sizeof(path), PROC_DIR "/%u/%s", pid, file);
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path[sizeof(path) - 1] = '\0';
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return fopen(path, "r");
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}
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static char *get_proc_name_cmdline(pid_t pid)
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{
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FILE *fp;
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static char str[1024];
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fp = proc_fopen(pid, "cmdline");
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if (fp == NULL)
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return NULL;
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if (fscanf(fp, "%s.1023", str) != 1) {
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fclose(fp);
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return NULL;
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}
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return (str);
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}
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static char *get_proc_name(pid_t pid)
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{
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FILE *fp;
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static char str[BUFSIZ];
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if (wide_output)
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return get_proc_name_cmdline(pid);
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fp = proc_fopen(pid, "stat");
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if (fp == NULL)
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return NULL;
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if (fscanf(fp, "%*d %s.16", str) != 1) {
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fclose(fp);
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return NULL;
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}
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if (*str) {
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str[strlen(str) - 1] = '\0';
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str[16] = 0;
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}
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fclose(fp);
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return (str+1);
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}
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static int get_proc_maps(pid_t pid)
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{
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FILE *fp;
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static char str[BUFSIZ];
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if ((fp = proc_fopen(pid, "maps")) == NULL)
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return -1;
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while (fgets(str, sizeof(str), fp)) {
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char *p;
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if ((p = strchr(str, ' ')) != NULL) {
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if (strlen(p) < 6)
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continue;
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/* 0x0-0x0 rwxp fffff000 00:00 0 */
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/* 0x0-0x0 R+W+XP fffff000 00:00 0 */
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++p; /* ' ' */
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++p; /* r */
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if (*p == '+')
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++p;
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/* FIXME: all of wx, w+, +x, ++ indicate w|x */
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if (tolower(*p) == 'w') {
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++p;
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if (*p == '+')
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++p;
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if (tolower(*p) == 'x') {
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fclose(fp);
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return 1;
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}
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}
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}
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}
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fclose(fp);
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return 0;
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}
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static int print_executable_mappings(pid_t pid)
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{
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FILE *fp;
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static char str[BUFSIZ];
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if ((fp = proc_fopen(pid, "maps")) == NULL)
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return -1;
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while (fgets(str, sizeof(str), fp)) {
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char *p;
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if ((p = strchr(str, ' ')) != NULL) {
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if (strlen(p) < 6)
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continue;
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/* 0x0-0x0 rwxp fffff000 00:00 0 */
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/* 0x0-0x0 R+W+XP fffff000 00:00 0 */
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++p; /* ' ' */
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++p; /* r */
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if (*p == '+')
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++p;
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/* FIXME: all of wx, w+, +x, ++ indicate w|x */
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if (tolower(*p) == 'w') {
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++p;
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if (*p == '+')
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++p;
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if (tolower(*p) == 'x')
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printf(" %s", str);
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}
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}
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}
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fclose(fp);
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return 0;
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}
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#ifdef __BOUNDS_CHECKING_ON
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# define NOTE_TO_SELF warn( \
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"This is bullshit but getpwuid() is leaking memory and I wasted a few hrs 1 day tracking it down in pspax\n" \
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"Later on I forgot I tracked it down before and saw pspax leaking memory so I tracked it down all over again (silly me)\n" \
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"Hopefully the getpwuid()/nis/nss/pam or whatever wont suck later on in the future.")
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#else
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# define NOTE_TO_SELF
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#endif
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static struct passwd *get_proc_passwd(pid_t pid)
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{
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struct stat st;
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struct passwd *pwd;
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char path[__PAX_UTILS_PATH_MAX];
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snprintf(path, sizeof(path), PROC_DIR "/%u/stat", pid);
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if (stat(path, &st) != -1)
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if ((pwd = getpwuid(st.st_uid)) != NULL)
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return pwd;
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return NULL;
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}
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static char *get_proc_status(pid_t pid, const char *name)
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{
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FILE *fp;
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size_t len;
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static char str[BUFSIZ];
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if ((fp = proc_fopen(pid, "status")) == NULL)
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return NULL;
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len = strlen(name);
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while (fgets(str, sizeof(str), fp)) {
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if (strncasecmp(str, name, len) != 0)
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continue;
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if (str[len] == ':') {
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fclose(fp);
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str[strlen(str) - 1] = 0;
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return (str + len + 2);
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}
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}
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fclose(fp);
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return NULL;
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}
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static char *get_pid_attr(pid_t pid)
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{
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FILE *fp;
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char *p;
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static char buf[BUFSIZ];
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if ((fp = proc_fopen(pid, "attr/current")) == NULL)
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return NULL;
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if (fgets(buf, sizeof(buf), fp) != NULL)
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if ((p = strchr(buf, '\n')) != NULL)
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*p = 0;
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fclose(fp);
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return buf;
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}
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static char *get_pid_addr(pid_t pid)
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{
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FILE *fp;
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char *p;
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static char buf[BUFSIZ];
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if ((fp = proc_fopen(pid, "ipaddr")) == NULL)
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return NULL;
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if (fgets(buf, sizeof(buf), fp) != NULL)
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if ((p = strchr(buf, '\n')) != NULL)
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*p = 0;
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fclose(fp);
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return buf;
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}
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static const char *get_proc_type(pid_t pid)
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{
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char fname[32];
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elfobj *elf;
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const char *ret;
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snprintf(fname, sizeof(fname), PROC_DIR "/%u/exe", pid);
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if ((elf = readelf(fname)) == NULL)
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return NULL;
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ret = get_elfetype(elf);
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unreadelf(elf);
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return ret;
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}
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static char *scanelf_file_phdr(elfobj *elf)
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{
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static char ret[8];
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unsigned long i, off, multi_stack, multi_load;
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int max_pt_load;
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memcpy(ret, "--- ---\0", 8);
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multi_stack = multi_load = 0;
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max_pt_load = elf_max_pt_load(elf);
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if (elf->phdr) {
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uint32_t flags;
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#define SHOW_PHDR(B) \
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if (elf->elf_class == ELFCLASS ## B) { \
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Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
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Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
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for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
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if (EGET(phdr[i].p_type) == PT_GNU_STACK) { \
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if (multi_stack++) warnf("%s: multiple PT_GNU_STACK's !?", elf->filename); \
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off = 0; \
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} else if (EGET(phdr[i].p_type) == PT_LOAD) { \
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| 282 |
if (multi_load++ > max_pt_load) warnf("%s: more than %i PT_LOAD's !?", elf->filename, max_pt_load); \
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off = 4; \
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} else \
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continue; \
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flags = EGET(phdr[i].p_flags); \
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memcpy(ret+off, gnu_short_stack_flags(flags), 3); \
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} \
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| 289 |
}
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| 290 |
SHOW_PHDR(32)
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| 291 |
SHOW_PHDR(64)
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| 292 |
}
|
| 293 |
|
| 294 |
return ret;
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| 295 |
}
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| 296 |
/* we scan the elf file two times when the -e flag is given. But we don't need -e very often so big deal */
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| 297 |
static const char *get_proc_phdr(pid_t pid)
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| 298 |
{
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| 299 |
char fname[32];
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| 300 |
elfobj *elf;
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| 301 |
const char *ret;
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| 302 |
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| 303 |
snprintf(fname, sizeof(fname), PROC_DIR "/%u/exe", pid);
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| 304 |
if ((elf = readelf(fname)) == NULL)
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| 305 |
return NULL;
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| 306 |
ret = scanelf_file_phdr(elf);
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| 307 |
unreadelf(elf);
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| 308 |
return ret;
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}
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| 310 |
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| 311 |
static void pspax(const char *find_name)
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{
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| 313 |
register DIR *dir;
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register struct dirent *de;
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pid_t pid;
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pid_t ppid = show_pid;
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int have_attr, have_addr, wx;
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| 318 |
struct passwd *pwd;
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| 319 |
struct stat st;
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| 320 |
const char *pax, *type, *name, *attr, *addr;
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char *caps;
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| 322 |
WRAP_SYSCAP(ssize_t length; cap_t cap_d;)
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| 323 |
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WRAP_SYSCAP(cap_d = cap_init());
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| 325 |
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dir = opendir(PROC_DIR);
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if (dir == NULL || chdir(PROC_DIR))
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errp(PROC_DIR);
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| 329 |
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| 330 |
if (access("/proc/self/attr/current", R_OK) != -1)
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have_attr = 1;
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else
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have_attr = 0;
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| 334 |
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| 335 |
if ((access("/proc/self/ipaddr", R_OK) != -1) && show_addr)
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| 336 |
have_addr = 1;
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| 337 |
else
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| 338 |
have_addr = 0;
|
| 339 |
|
| 340 |
if (show_banner)
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| 341 |
printf("%-8s %-6s %-6s %-4s %-10s %-16s %-4s %-4s %s %s\n",
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| 342 |
"USER", "PID", "PAX", "MAPS", "ETYPE", "NAME", "CAPS", have_attr ? "ATTR" : "",
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| 343 |
have_addr ? "IPADDR" : "", show_phdr ? "STACK LOAD" : "");
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| 344 |
|
| 345 |
while ((de = readdir(dir))) {
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| 346 |
errno = 0;
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| 347 |
stat(de->d_name, &st);
|
| 348 |
if ((errno != ENOENT) && (errno != EACCES)) {
|
| 349 |
pid = (pid_t) atoi((char *) basename((char *) de->d_name));
|
| 350 |
if (find_name && pid) {
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| 351 |
char *str = get_proc_name(pid);
|
| 352 |
if (!str)
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| 353 |
continue;
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| 354 |
if (strcmp(str, find_name) != 0)
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| 355 |
pid = 0;
|
| 356 |
}
|
| 357 |
if (((ppid > 0) && (pid != ppid)) || !pid)
|
| 358 |
continue;
|
| 359 |
|
| 360 |
wx = get_proc_maps(pid);
|
| 361 |
|
| 362 |
if (noexec != writeexec) {
|
| 363 |
if ((wx == 1) && (writeexec != wx))
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| 364 |
goto next_pid;
|
| 365 |
|
| 366 |
if ((wx == 0) && writeexec)
|
| 367 |
goto next_pid;
|
| 368 |
}
|
| 369 |
|
| 370 |
pwd = get_proc_passwd(pid);
|
| 371 |
pax = get_proc_status(pid, "PAX");
|
| 372 |
type = get_proc_type(pid);
|
| 373 |
name = get_proc_name(pid);
|
| 374 |
attr = (have_attr ? get_pid_attr(pid) : NULL);
|
| 375 |
addr = (have_addr ? get_pid_addr(pid) : NULL);
|
| 376 |
|
| 377 |
if (show_uid != -1 && pwd)
|
| 378 |
if (pwd->pw_uid != show_uid)
|
| 379 |
continue;
|
| 380 |
|
| 381 |
if (show_gid != -1 && pwd)
|
| 382 |
if (pwd->pw_gid != show_gid)
|
| 383 |
continue;
|
| 384 |
|
| 385 |
/* this is a non-POSIX function */
|
| 386 |
caps = NULL;
|
| 387 |
WRAP_SYSCAP(capgetp(pid, cap_d));
|
| 388 |
WRAP_SYSCAP(caps = cap_to_text(cap_d, &length));
|
| 389 |
|
| 390 |
if (pwd && strlen(pwd->pw_name) >= 8)
|
| 391 |
pwd->pw_name[8] = 0;
|
| 392 |
|
| 393 |
if (show_all || type) {
|
| 394 |
printf("%-8s %-6d %-6s %-4s %-10s %-16s %-4s %s %s %s\n",
|
| 395 |
pwd ? pwd->pw_name : "--------",
|
| 396 |
pid,
|
| 397 |
pax ? pax : "---",
|
| 398 |
(wx == 1) ? "w|x" : (wx == -1) ? "---" : "w^x",
|
| 399 |
type ? type : "-------",
|
| 400 |
name ? name : "-----",
|
| 401 |
caps ? caps : " = ",
|
| 402 |
attr ? attr : "",
|
| 403 |
addr ? addr : "",
|
| 404 |
show_phdr ? get_proc_phdr(pid) : "");
|
| 405 |
if (verbose && wx)
|
| 406 |
print_executable_mappings(pid);
|
| 407 |
}
|
| 408 |
|
| 409 |
WRAP_SYSCAP(if (caps) cap_free(caps));
|
| 410 |
|
| 411 |
next_pid:
|
| 412 |
continue;
|
| 413 |
}
|
| 414 |
}
|
| 415 |
closedir(dir);
|
| 416 |
}
|
| 417 |
|
| 418 |
/* usage / invocation handling functions */
|
| 419 |
#define PARSE_FLAGS "aeip:u:g:nwWvCBhV"
|
| 420 |
#define a_argument required_argument
|
| 421 |
static struct option const long_opts[] = {
|
| 422 |
{"all", no_argument, NULL, 'a'},
|
| 423 |
{"header", no_argument, NULL, 'e'},
|
| 424 |
{"ipaddr", no_argument, NULL, 'i'},
|
| 425 |
{"pid", a_argument, NULL, 'p'},
|
| 426 |
{"user", a_argument, NULL, 'u'},
|
| 427 |
{"group", a_argument, NULL, 'g'},
|
| 428 |
{"nx", no_argument, NULL, 'n'},
|
| 429 |
{"wx", no_argument, NULL, 'w'},
|
| 430 |
{"wide", no_argument, NULL, 'W'},
|
| 431 |
{"verbose", no_argument, NULL, 'v'},
|
| 432 |
{"nocolor", no_argument, NULL, 'C'},
|
| 433 |
{"nobanner", no_argument, NULL, 'B'},
|
| 434 |
{"help", no_argument, NULL, 'h'},
|
| 435 |
{"version", no_argument, NULL, 'V'},
|
| 436 |
{NULL, no_argument, NULL, 0x0}
|
| 437 |
};
|
| 438 |
|
| 439 |
static const char * const opts_help[] = {
|
| 440 |
"Show all processes",
|
| 441 |
"Print GNU_STACK/PT_LOAD markings",
|
| 442 |
"Print ipaddr info if supported",
|
| 443 |
"Process ID/pid #",
|
| 444 |
"Process user/uid #",
|
| 445 |
"Process group/gid #",
|
| 446 |
"Only display w^x processes",
|
| 447 |
"Only display w|x processes",
|
| 448 |
"Wide output display of cmdline",
|
| 449 |
"Be verbose about executable mappings",
|
| 450 |
"Don't emit color in output",
|
| 451 |
"Don't display the header",
|
| 452 |
"Print this help and exit",
|
| 453 |
"Print version and exit",
|
| 454 |
NULL
|
| 455 |
};
|
| 456 |
|
| 457 |
/* display usage and exit */
|
| 458 |
static void usage(int status)
|
| 459 |
{
|
| 460 |
int i;
|
| 461 |
printf("* List ELF/PaX information about running processes\n\n"
|
| 462 |
"Usage: %s [options]\n\n", argv0);
|
| 463 |
fputs("Options:\n", stdout);
|
| 464 |
for (i = 0; long_opts[i].name; ++i)
|
| 465 |
printf(" -%c, --%-12s* %s\n", long_opts[i].val,
|
| 466 |
long_opts[i].name, opts_help[i]);
|
| 467 |
#ifdef MANLYPAGE
|
| 468 |
for (i = 0; long_opts[i].name; ++i)
|
| 469 |
printf(".TP\n\\fB\\-%c, \\-\\-%s\\fR\n%s\n", long_opts[i].val,
|
| 470 |
long_opts[i].name, opts_help[i]);
|
| 471 |
#endif
|
| 472 |
exit(status);
|
| 473 |
}
|
| 474 |
|
| 475 |
/* parse command line arguments and preform needed actions */
|
| 476 |
static void parseargs(int argc, char *argv[])
|
| 477 |
{
|
| 478 |
int flag;
|
| 479 |
struct passwd *pwd = NULL;
|
| 480 |
struct group *gwd = NULL;
|
| 481 |
|
| 482 |
opterr = 0;
|
| 483 |
while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
|
| 484 |
switch (flag) {
|
| 485 |
|
| 486 |
case 'V': /* version info */
|
| 487 |
printf("pax-utils-%s: %s compiled %s\n%s\n"
|
| 488 |
"%s written for Gentoo by <solar and vapier @ gentoo.org>\n",
|
| 489 |
VERSION, __FILE__, __DATE__, rcsid, argv0);
|
| 490 |
exit(EXIT_SUCCESS);
|
| 491 |
break;
|
| 492 |
case 'h': usage(EXIT_SUCCESS); break;
|
| 493 |
|
| 494 |
case 'C': color_init(true); break;
|
| 495 |
case 'B': show_banner = 0; break;
|
| 496 |
case 'a': show_all = 1; break;
|
| 497 |
case 'e': show_phdr = 1; break;
|
| 498 |
case 'i': show_addr = 1; break;
|
| 499 |
case 'p': show_pid = atoi(optarg); break;
|
| 500 |
case 'n': noexec = 1; writeexec = 0; break;
|
| 501 |
case 'w': noexec = 0; writeexec = 1; break;
|
| 502 |
case 'W': wide_output = 1; break;
|
| 503 |
case 'v': verbose++; break;
|
| 504 |
case 'u':
|
| 505 |
show_uid = atoi(optarg);
|
| 506 |
if (show_uid == 0 && (strcmp(optarg, "0") != 0)) {
|
| 507 |
pwd = getpwnam(optarg);
|
| 508 |
if (pwd)
|
| 509 |
show_uid = pwd->pw_uid;
|
| 510 |
else
|
| 511 |
err("unknown uid");
|
| 512 |
}
|
| 513 |
break;
|
| 514 |
case 'g':
|
| 515 |
show_gid = atoi(optarg);
|
| 516 |
if (show_gid == 0 && (strcmp(optarg, "0") != 0)) {
|
| 517 |
gwd = getgrnam(optarg);
|
| 518 |
if (gwd)
|
| 519 |
show_gid = gwd->gr_gid;
|
| 520 |
else
|
| 521 |
err("unknown gid");
|
| 522 |
}
|
| 523 |
break;
|
| 524 |
case ':':
|
| 525 |
case '?':
|
| 526 |
warn("Unknown option or missing parameter");
|
| 527 |
usage(EXIT_FAILURE);
|
| 528 |
break;
|
| 529 |
default:
|
| 530 |
err("Unhandled option '%c'", flag);
|
| 531 |
break;
|
| 532 |
}
|
| 533 |
}
|
| 534 |
}
|
| 535 |
|
| 536 |
int main(int argc, char *argv[])
|
| 537 |
{
|
| 538 |
char *name = NULL;
|
| 539 |
|
| 540 |
color_init(false);
|
| 541 |
parseargs(argc, argv);
|
| 542 |
|
| 543 |
if ((optind < argc) && (show_pid == 0))
|
| 544 |
name = argv[optind];
|
| 545 |
|
| 546 |
pspax(name);
|
| 547 |
|
| 548 |
NOTE_TO_SELF;
|
| 549 |
return EXIT_SUCCESS;
|
| 550 |
}
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