fedora/glibc_post_upgrade.c

   1 #if defined __sparc__ && defined __arch64__
   2 register void *__thread_self __asm ("g7");
   3 #endif
   4 #include <sys/types.h>
   5 #include <sys/wait.h>
   6 #include <stdio.h>
   7 #include <errno.h>
   8 #include <unistd.h>
   9 #include <sys/time.h>
  10 #include <dirent.h>
  11 #include <stddef.h>
  12 #include <fcntl.h>
  13 #include <string.h>
  14 #include <sys/stat.h>
  15 #include <elf.h>
  16
  17 #define verbose_exec(failcode, path...) \
  18   do                                                    \
  19     {                                                   \
  20       char *const arr[] = { path, NULL };               \
  21       vexec (failcode, arr);                            \
  22     } while (0)
  23
  24 __attribute__((noinline)) void vexec (int failcode, char *const path[]);
  25 __attribute__((noinline)) void says (const char *str);
  26 __attribute__((noinline)) void sayn (long num);
  27 __attribute__((noinline)) void message (char *const path[]);
  28 __attribute__((noinline)) int check_elf (const char *name);
  29
  30 int
  31 main (void)
  32 {
  33   char initpath[256];
  34
  35   char buffer[4096];
  36   struct pref {
  37     char *p;
  38     int len;
  39   } prefix[] = { { "libc-", 5 }, { "libm-", 5 },
  40                  { "librt-", 6 }, { "libpthread-", 11 },
  41                  { "librtkaio-", 10 }, { "libthread_db-", 13 } };
  42   int i, j, fd;
  43   off_t base;
  44   ssize_t ret;
  45 #ifdef __i386__
  46   const char *remove_dirs[] = { "/lib/tls", "/lib/i686", "/lib/tls/i486", "/lib/tls/i586", "/lib/tls/i686" };
  47 #else
  48 #ifndef LIBTLS
  49 #define LIBTLS "/lib/tls"
  50 #endif
  51   const char *remove_dirs[] = { LIBTLS };
  52 #endif
  53   for (j = 0; j < sizeof (remove_dirs) / sizeof (remove_dirs[0]); ++j)
  54     {
  55       size_t rmlen = strlen (remove_dirs[j]);
  56       fd = open (remove_dirs[j], O_RDONLY);
  57       if (fd >= 0
  58           && (ret = getdirentries (fd, buffer, sizeof (buffer), &base))
  59              >= (ssize_t) offsetof (struct dirent, d_name))
  60         {
  61           for (base = 0; base + offsetof (struct dirent, d_name) < ret; )
  62             {
  63               struct dirent *d = (struct dirent *) (buffer + base);
  64
  65               for (i = 0; i < sizeof (prefix) / sizeof (prefix[0]); i++)
  66                 if (! strncmp (d->d_name, prefix[i].p, prefix[i].len))
  67                   {
  68                     char *p = d->d_name + prefix[i].len;
  69
  70                     while (*p == '.' || (*p >= '0' && *p <= '9')) p++;
  71                     if (p[0] == 's' && p[1] == 'o' && p[2] == '\0'
  72                         && p + 3 - d->d_name
  73                            < sizeof (initpath) - rmlen - 1)
  74                       {
  75                         memcpy (initpath, remove_dirs[j], rmlen);
  76                         initpath[rmlen] = '/';
  77                         strcpy (initpath + rmlen + 1, d->d_name);
  78                         unlink (initpath);
  79                         break;
  80                       }
  81                   }
  82               base += d->d_reclen;
  83             }
  84           close (fd);
  85         }
  86     }
  87
  88   int ldsocfd = open (LD_SO_CONF, O_RDONLY);
  89   struct stat ldsocst;
  90   if (ldsocfd >= 0 && fstat (ldsocfd, &ldsocst) >= 0)
  91     {
  92       char p[ldsocst.st_size + 1];
  93       if (read (ldsocfd, p, ldsocst.st_size) == ldsocst.st_size)
  94         {
  95           p[ldsocst.st_size] = '\0';
  96           if (strstr (p, "include ld.so.conf.d/*.conf") == NULL)
  97             {
  98               close (ldsocfd);
  99               ldsocfd = open (LD_SO_CONF, O_WRONLY | O_TRUNC);
 100               if (ldsocfd >= 0)
 101                 {
 102                   size_t slen = strlen ("include ld.so.conf.d/*.conf\n");
 103                   if (write (ldsocfd, "include ld.so.conf.d/*.conf\n", slen)
 104                       != slen
 105                       || write (ldsocfd, p, ldsocst.st_size) != ldsocst.st_size)
 106                     _exit (109);
 107                 }
 108             }
 109         }
 110       if (ldsocfd >= 0)
 111         close (ldsocfd);
 112     }
 113
 114   /* If installing bi-arch glibc, rpm sometimes doesn't unpack all files
 115      before running one of the lib's %post scriptlet.  /sbin/ldconfig will
 116      then be run by the other arch's %post.  */
 117   if (! access ("/sbin/ldconfig", X_OK))
 118     verbose_exec (110, "/sbin/ldconfig", "/sbin/ldconfig");
 119
 120   if (! utimes (GCONV_MODULES_DIR "/gconv-modules.cache", NULL))
 121     {
 122 #ifndef ICONVCONFIG
 123 #define ICONVCONFIG "/usr/sbin/iconvconfig"
 124 #endif
 125       verbose_exec (113, ICONVCONFIG, "/usr/sbin/iconvconfig",
 126                     "-o", GCONV_MODULES_DIR"/gconv-modules.cache",
 127                     "--nostdlib", GCONV_MODULES_DIR);
 128     }
 129
 130   /* Check if telinit is available and the init fifo as well.  */
 131   if (access ("/sbin/telinit", X_OK) || access ("/dev/initctl", F_OK))
 132     _exit (0);
 133   /* Check if we are not inside of some chroot, because we'd just
 134      timeout and leave /etc/initrunlvl.  */
 135   if (readlink ("/proc/1/exe", initpath, 256) <= 0 ||
 136       readlink ("/proc/1/root", initpath, 256) <= 0)
 137     _exit (0);
 138
 139   if (check_elf ("/proc/1/exe"))
 140     verbose_exec (116, "/sbin/telinit", "/sbin/telinit", "u");
 141
 142   /* Check if we can safely condrestart sshd.  */
 143   if (access ("/sbin/service", X_OK) == 0
 144       && access ("/usr/sbin/sshd", X_OK) == 0
 145       && access ("/bin/bash", X_OK) == 0)
 146     {
 147       if (check_elf ("/usr/sbin/sshd"))
 148         verbose_exec (-121, "/sbin/service", "/sbin/service", "sshd", "condrestart");
 149     }
 150
 151   _exit(0);
 152 }
 153
 154 #ifndef NO_SIZE_OPTIMIZATION
 155 int __libc_multiple_threads __attribute__((nocommon));
 156 int __libc_enable_asynccancel (void) { return 0; }
 157 void __libc_disable_asynccancel (int x) { }
 158 void __libc_csu_init (void) { }
 159 void __libc_csu_fini (void) { }
 160 pid_t __fork (void) { return -1; }
 161 char thr_buf[65536];
 162
 163 # ifndef __powerpc__
 164 int
 165 __libc_start_main (int (*main) (void), int argc, char **argv,
 166                    void (*init) (void), void (*fini) (void),
 167                    void (*rtld_fini) (void), void * stack_end)
 168 # else
 169 struct startup_info
 170 {
 171   void *sda_base;
 172   int (*main) (int, char **, char **, void *);
 173   int (*init) (int, char **, char **, void *);
 174   void (*fini) (void);
 175 };
 176
 177 int
 178 __libc_start_main (int argc, char **ubp_av, char **ubp_ev,
 179                    void *auxvec, void (*rtld_fini) (void),
 180                    struct startup_info *stinfo,
 181                    char **stack_on_entry)
 182 # endif
 183 {
 184 #if defined __ia64__ || defined __powerpc64__
 185   register void *r13 __asm ("r13") = thr_buf + 32768;
 186   __asm ("" : : "r" (r13));
 187 #elif defined __sparc__
 188   register void *g6 __asm ("g6") = thr_buf + 32768;
 189 # ifdef __arch64__
 190   __thread_self = thr_buf + 32768;
 191 # else
 192   register void *__thread_self __asm ("g7") = thr_buf + 32768;
 193 # endif
 194   __asm ("" : : "r" (g6), "r" (__thread_self));
 195 #elif defined __s390__ && !defined __s390x__
 196   __asm ("sar %%a0,%0" : : "d" (thr_buf + 32768));
 197 #elif defined __s390x__
 198   __asm ("sar %%a1,%0; srlg 0,%0,32; sar %%a0,0" : : "d" (thr_buf + 32768) : "0");
 199 #elif defined __powerpc__ && !defined __powerpc64__
 200   register void *r2 __asm ("r2") = thr_buf + 32768;
 201   __asm ("" : : "r" (r2));
 202 #endif
 203   main();
 204   return 0;
 205 }
 206 #endif
 207
 208 void
 209 vexec (int failcode, char *const path[])
 210 {
 211   pid_t pid;
 212   int status, save_errno;
 213   int devnull = 0;
 214
 215   if (failcode < 0)
 216     {
 217       devnull = 1;
 218       failcode = -failcode;
 219     }
 220   pid = vfork ();
 221   if (pid == 0)
 222     {
 223       int fd;
 224       if (devnull && (fd = open ("/dev/null", O_WRONLY)) >= 0)
 225         {
 226           dup2 (fd, 1);
 227           dup2 (fd, 2);
 228           close (fd);
 229         }
 230       execv (path[0], path + 1);
 231       save_errno = errno;
 232       message (path);
 233       says (" exec failed with errno ");
 234       sayn (save_errno);
 235       says ("\n");
 236       _exit (failcode);
 237     }
 238   else if (pid < 0)
 239     {
 240       save_errno = errno;
 241       message (path);
 242       says (" fork failed with errno ");
 243       sayn (save_errno);
 244       says ("\n");
 245       _exit (failcode + 1);
 246     }
 247   if (waitpid (0, &status, 0) != pid || !WIFEXITED (status))
 248     {
 249       message (path);
 250       says (" child terminated abnormally\n");
 251       _exit (failcode + 2);
 252     }
 253   if (WEXITSTATUS (status))
 254     {
 255       message (path);
 256       says (" child exited with exit code ");
 257       sayn (WEXITSTATUS (status));
 258       says ("\n");
 259       _exit (WEXITSTATUS (status));
 260     }
 261 }
 262
 263 void
 264 says (const char *str)
 265 {
 266   write (1, str, strlen (str));
 267 }
 268
 269 void
 270 sayn (long num)
 271 {
 272   char string[sizeof (long) * 3 + 1];
 273   char *p = string + sizeof (string) - 1;
 274
 275   *p = '\0';
 276   if (num == 0)
 277     *--p = '0';
 278   else
 279     while (num)
 280       {
 281         *--p = '0' + num % 10;
 282         num = num / 10;
 283       }
 284
 285   says (p);
 286 }
 287
 288 void
 289 message (char *const path[])
 290 {
 291   says ("/usr/sbin/glibc_post_upgrade: While trying to execute ");
 292   says (path[0]);
 293 }
 294
 295 int
 296 check_elf (const char *name)
 297 {
 298   /* Play safe, if we can't open or read, assume it might be
 299      ELF for the current arch.  */
 300   int ret = 1;
 301   int fd = open (name, O_RDONLY);
 302   if (fd >= 0)
 303     {
 304       Elf32_Ehdr ehdr;
 305       if (read (fd, &ehdr, offsetof (Elf32_Ehdr, e_version))
 306           == offsetof (Elf32_Ehdr, e_version))
 307         {
 308           ret = 0;
 309           if (ehdr.e_ident[EI_CLASS]
 310               == (sizeof (long) == 8 ? ELFCLASS64 : ELFCLASS32))
 311             {
 312 #if defined __i386__
 313               ret = ehdr.e_machine == EM_386;
 314 #elif defined __x86_64__
 315               ret = ehdr.e_machine == EM_X86_64;
 316 #elif defined __ia64__
 317               ret = ehdr.e_machine == EM_IA_64;
 318 #elif defined __powerpc64__
 319               ret = ehdr.e_machine == EM_PPC64;
 320 #elif defined __powerpc__
 321               ret = ehdr.e_machine == EM_PPC;
 322 #elif defined __s390__ || defined __s390x__
 323               ret = ehdr.e_machine == EM_S390;
 324 #elif defined __x86_64__
 325               ret = ehdr.e_machine == EM_X86_64;
 326 #elif defined __sparc__
 327               if (sizeof (long) == 8)
 328                 ret = ehdr.e_machine == EM_SPARCV9;
 329               else
 330                 ret = (ehdr.e_machine == EM_SPARC
 331                        || ehdr.e_machine == EM_SPARC32PLUS);
 332 #else
 333               ret = 1;
 334 #endif
 335             }
 336         }
 337       close (fd);
 338     }
 339   return ret;
 340 }