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 int __libc_multiple_threads __attribute__((nocommon));
 155 int __libc_enable_asynccancel (void) { return 0; }
 156 void __libc_disable_asynccancel (int x) { }
 157 void __libc_csu_init (void) { }
 158 void __libc_csu_fini (void) { }
 159 pid_t __fork (void) { return -1; }
 160 char thr_buf[65536];
 161
 162 #ifndef __powerpc__
 163 int
 164 __libc_start_main (int (*main) (void), int argc, char **argv,
 165                    void (*init) (void), void (*fini) (void),
 166                    void (*rtld_fini) (void), void * stack_end)
 167 #else
 168 struct startup_info
 169 {
 170   void *sda_base;
 171   int (*main) (int, char **, char **, void *);
 172   int (*init) (int, char **, char **, void *);
 173   void (*fini) (void);
 174 };
 175
 176 int
 177 __libc_start_main (int argc, char **ubp_av, char **ubp_ev,
 178                    void *auxvec, void (*rtld_fini) (void),
 179                    struct startup_info *stinfo,
 180                    char **stack_on_entry)
 181 #endif
 182 {
 183 #if defined __ia64__ || defined __powerpc64__
 184   register void *r13 __asm ("r13") = thr_buf + 32768;
 185   __asm ("" : : "r" (r13));
 186 #elif defined __sparc__
 187   register void *g6 __asm ("g6") = thr_buf + 32768;
 188 # ifdef __arch64__
 189   __thread_self = thr_buf + 32768;
 190 # else
 191   register void *__thread_self __asm ("g7") = thr_buf + 32768;
 192 # endif
 193   __asm ("" : : "r" (g6), "r" (__thread_self));
 194 #elif defined __s390__ && !defined __s390x__
 195   __asm ("sar %%a0,%0" : : "d" (thr_buf + 32768));
 196 #elif defined __s390x__
 197   __asm ("sar %%a1,%0; srlg 0,%0,32; sar %%a0,0" : : "d" (thr_buf + 32768) : "0");
 198 #elif defined __powerpc__ && !defined __powerpc64__
 199   register void *r2 __asm ("r2") = thr_buf + 32768;
 200   __asm ("" : : "r" (r2));
 201 #endif
 202   main();
 203   return 0;
 204 }
 205
 206 void
 207 vexec (int failcode, char *const path[])
 208 {
 209   pid_t pid;
 210   int status, save_errno;
 211
 212   pid = vfork ();
 213   if (pid == 0)
 214     {
 215       execv (path[0], path + 1);
 216       save_errno = errno;
 217       message (path);
 218       says (" exec failed with errno ");
 219       sayn (save_errno);
 220       says ("\n");
 221       _exit (failcode);
 222     }
 223   else if (pid < 0)
 224     {
 225       save_errno = errno;
 226       message (path);
 227       says (" fork failed with errno ");
 228       sayn (save_errno);
 229       says ("\n");
 230       _exit (failcode + 1);
 231     }
 232   if (waitpid (0, &status, 0) != pid || !WIFEXITED (status))
 233     {
 234       message (path);
 235       says (" child terminated abnormally\n");
 236       _exit (failcode + 2);
 237     }
 238   if (WEXITSTATUS (status))
 239     {
 240       message (path);
 241       says (" child exited with exit code ");
 242       sayn (WEXITSTATUS (status));
 243       says ("\n");
 244       _exit (WEXITSTATUS (status));
 245     }
 246 }
 247
 248 void
 249 says (const char *str)
 250 {
 251   write (1, str, strlen (str));
 252 }
 253
 254 void
 255 sayn (long num)
 256 {
 257   char string[sizeof (long) * 3 + 1];
 258   char *p = string + sizeof (string) - 1;
 259
 260   *p = '\0';
 261   if (num == 0)
 262     *--p = '0';
 263   else
 264     while (num)
 265       {
 266         *--p = '0' + num % 10;
 267         num = num / 10;
 268       }
 269
 270   says (p);
 271 }
 272
 273 void
 274 message (char *const path[])
 275 {
 276   says ("/usr/sbin/glibc_post_upgrade: While trying to execute ");
 277   says (path[0]);
 278 }
 279
 280 int
 281 check_elf (const char *name)
 282 {
 283   /* Play safe, if we can't open or read, assume it might be
 284      ELF for the current arch.  */
 285   int ret = 1;
 286   int fd = open (name, O_RDONLY);
 287   if (fd >= 0)
 288     {
 289       Elf32_Ehdr ehdr;
 290       if (read (fd, &ehdr, offsetof (Elf32_Ehdr, e_version))
 291           == offsetof (Elf32_Ehdr, e_version))
 292         {
 293           ret = 0;
 294           if (ehdr.e_ident[EI_CLASS]
 295               == (sizeof (long) == 8 ? ELFCLASS64 : ELFCLASS32))
 296             {
 297 #if defined __i386__
 298               ret = ehdr.e_machine == EM_386;
 299 #elif defined __x86_64__
 300               ret = ehdr.e_machine == EM_X86_64;
 301 #elif defined __ia64__
 302               ret = ehdr.e_machine == EM_IA_64;
 303 #elif defined __powerpc64__
 304               ret = ehdr.e_machine == EM_PPC64;
 305 #elif defined __powerpc__
 306               ret = ehdr.e_machine == EM_PPC;
 307 #elif defined __s390__ || defined __s390x__
 308               ret = ehdr.e_machine == EM_S390;
 309 #elif defined __x86_64__
 310               ret = ehdr.e_machine == EM_X86_64;
 311 #elif defined __sparc__
 312               if (sizeof (long) == 8)
 313                 ret = ehdr.e_machine == EM_SPARCV9;
 314               else
 315                 ret = (ehdr.e_machine == EM_SPARC
 316                        || ehdr.e_machine == EM_SPARC32PLUS);
 317 #else
 318               ret = 1;
 319 #endif
 320             }
 321         }
 322       close (fd);
 323     }
 324   return ret;
 325 }