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glibc/glibc_post_upgrade.c

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/* skeleton based on version from Fedora Core 3 */
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>
#include <dirent.h>
#include <stddef.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <elf.h>
#define verbose_exec(failcode, path...) \
do \
{ \
char *const arr[] = { path, NULL }; \
vexec (failcode, arr); \
} while (0)
__attribute__((noinline)) void vexec (int failcode, char *const path[]);
__attribute__((noinline)) void says (const char *str);
__attribute__((noinline)) void sayn (long num);
__attribute__((noinline)) void message (char *const path[]);
__attribute__((noinline)) int check_elf (const char *name);
int
main (void)
{
char initpath[256];
struct stat root, init_root;
#ifdef REMOVE_TLS_DIRS
const char *library[] = {"libc.so.6", "libc.so.6.1", "libm.so.6",
"libm.so.6.1", "librt.so.1", "librtkaio.so.1",
"libpthread.so.0", "libthread_db.so.1"};
const char *remove_dir[] = {
#ifdef __i386__
"/lib/i686/",
#endif
#ifdef __powerpc64__
#ifdef REMOVE_PPC_OPTIMIZE_POWER4
"/lib64/power4/",
"/lib64/ppc970/",
#endif
#ifdef REMOVE_PPC_OPTIMIZE_POWER5
"/lib64/power5/",
"/lib64/power5+/",
#endif
#ifdef REMOVE_PPC_OPTIMIZE_POWER6
"/lib64/power6/",
"/lib64/power6x/",
#endif
#ifdef REMOVE_PPC_OPTIMIZE_POWER7
"/lib64/power7/",
#endif
#ifdef REMOVE_PPC_OPTIMIZE_CELL
"/lib64/ppc-cell-be/",
#endif
#endif /* __powerpc64__ */
#ifdef __powerpc__
#ifdef REMOVE_PPC_OPTIMIZE_POWER4
"/lib/power4/",
"/lib/ppc970/",
#endif
#ifdef REMOVE_PPC_OPTIMIZE_POWER5
"/lib/power5/",
"/lib/power5+/",
#endif
#ifdef REMOVE_PPC_OPTIMIZE_POWER6
"/lib/power6/",
"/lib/power6x/",
#endif
#ifdef REMOVE_PPC_OPTIMIZE_POWER7
"/lib/power7/",
#endif
#ifdef REMOVE_PPC_OPTIMIZE_CELL
"/lib/ppc-cell-be/",
#endif
#endif /* __powerpc__ */
LIBDIR"/tls/" };
int i, j;
for (i = 0; i < sizeof (remove_dir) / sizeof (remove_dir[0]); ++i)
for (j = 0; j < sizeof (library) / sizeof (library[0]); j++)
{
char buf[strlen (remove_dir[i]) + strlen (library[j]) + 1];
char readlink_buf[(strlen (remove_dir[i]) + strlen (library[j])) * 2 + 30];
ssize_t len;
char *cp;
cp = stpcpy (buf, remove_dir[i]);
strcpy (cp, library[j]);
/* This file could be a symlink to library-%{version}.so, so check
this and don't remove only the link, but also the library itself. */
cp = stpcpy (readlink_buf, remove_dir[i]);
if ((len = readlink (buf, cp, (sizeof (readlink_buf)
- (cp - readlink_buf) - 1))) > 0)
{
cp[len] = '\0';
if (cp[0] != '/') cp = readlink_buf;
unlink (cp);
}
unlink (buf);
}
#endif
/* If installing bi-arch glibc, rpm sometimes doesn't unpack all files
before running one of the lib's %post scriptlet. /sbin/ldconfig will
then be run by the other arch's %post. */
if (access ("/sbin/ldconfig", X_OK) == 0)
verbose_exec (110, "/sbin/ldconfig", "/sbin/ldconfig", "-X");
if (utimes (GCONV_MODULES_DIR "/gconv-modules.cache", NULL) == 0)
{
#ifndef ICONVCONFIG
#define ICONVCONFIG "/usr/sbin/iconvconfig"
#endif
verbose_exec (113, ICONVCONFIG, "/usr/sbin/iconvconfig",
"-o", GCONV_MODULES_DIR"/gconv-modules.cache",
"--nostdlib", GCONV_MODULES_DIR);
}
/* Check if telinit is available and the init fifo as well. */
if (access ("/sbin/telinit", X_OK) || access ("/dev/initctl", F_OK))
_exit (0);
/* Check if we are not inside of some chroot, because we'd just
timeout and leave /etc/initrunlvl. */
if (readlink ("/proc/1/exe", initpath, 256) <= 0 ||
readlink ("/proc/1/root", initpath, 256) <= 0 ||
stat ("/proc/1/root", &init_root) < 0 ||
stat ("/.buildenv", &init_root) < 0 || /* XEN build */
stat ("/", &root) < 0 ||
init_root.st_dev != root.st_dev || init_root.st_ino != root.st_ino)
_exit (0);
if (check_elf ("/proc/1/exe"))
verbose_exec (116, "/sbin/telinit", "/sbin/telinit", "u");
#if 0
/* Check if we can safely condrestart sshd. */
if (access ("/sbin/service", X_OK) == 0
&& access ("/usr/sbin/sshd", X_OK) == 0
&& access ("/bin/bash", X_OK) == 0)
{
if (check_elf ("/usr/sbin/sshd"))
verbose_exec (121, "/sbin/service", "/sbin/service", "sshd", "condrestart");
}
#endif
_exit(0);
}
void
vexec (int failcode, char *const path[])
{
pid_t pid;
int status, save_errno;
pid = vfork ();
if (pid == 0)
{
execv (path[0], path + 1);
save_errno = errno;
message (path);
says (" exec failed with errno ");
sayn (save_errno);
says ("\n");
_exit (failcode);
}
else if (pid < 0)
{
save_errno = errno;
message (path);
says (" fork failed with errno ");
sayn (save_errno);
says ("\n");
_exit (failcode + 1);
}
if (waitpid (0, &status, 0) != pid || !WIFEXITED (status))
{
message (path);
says (" child terminated abnormally\n");
_exit (failcode + 2);
}
if (WEXITSTATUS (status))
{
message (path);
says (" child exited with exit code ");
sayn (WEXITSTATUS (status));
says ("\n");
_exit (WEXITSTATUS (status));
}
}
void
says (const char *str)
{
write (1, str, strlen (str));
}
void
sayn (long num)
{
char string[sizeof (long) * 3 + 1];
char *p = string + sizeof (string) - 1;
*p = '\0';
if (num == 0)
*--p = '0';
else
while (num)
{
*--p = '0' + num % 10;
num = num / 10;
}
says (p);
}
void
message (char *const path[])
{
says ("/usr/sbin/glibc_post_upgrade: While trying to execute ");
says (path[0]);
}
int
check_elf (const char *name)
{
/* Play safe, if we can't open or read, assume it might be
ELF for the current arch. */
int ret = 1;
int fd = open (name, O_RDONLY);
if (fd >= 0)
{
Elf32_Ehdr ehdr;
if (read (fd, &ehdr, offsetof (Elf32_Ehdr, e_version))
== offsetof (Elf32_Ehdr, e_version))
{
ret = 0;
if (ehdr.e_ident[EI_CLASS]
== (sizeof (long) == 8 ? ELFCLASS64 : ELFCLASS32))
{
#if defined __i386__
ret = ehdr.e_machine == EM_386;
#elif defined __x86_64__
ret = ehdr.e_machine == EM_X86_64;
#elif defined __ia64__
ret = ehdr.e_machine == EM_IA_64;
#elif defined __powerpc64__
ret = ehdr.e_machine == EM_PPC64;
#elif defined __powerpc__
ret = ehdr.e_machine == EM_PPC;
#elif defined __s390__ || defined __s390x__
ret = ehdr.e_machine == EM_S390;
#elif defined __x86_64__
ret = ehdr.e_machine == EM_X86_64;
#elif defined __sparc__
if (sizeof (long) == 8)
ret = ehdr.e_machine == EM_SPARCV9;
else
ret = (ehdr.e_machine == EM_SPARC
|| ehdr.e_machine == EM_SPARC32PLUS);
#else
ret = 1;
#endif
}
}
close (fd);
}
return ret;
}
#ifdef SMALL_BINARY
int __libc_multiple_threads __attribute__((nocommon));
int __libc_enable_asynccancel (void) { return 0; }
void __libc_disable_asynccancel (int x) { }
void __libc_csu_init (void) { }
void __libc_csu_fini (void) { }
pid_t __fork (void) { return -1; }
char thr_buf[65536];
#ifndef __powerpc__
int
__libc_start_main (int (*main) (void), int argc, char **argv,
void (*init) (void), void (*fini) (void),
void (*rtld_fini) (void), void * stack_end)
#else
struct startup_info
{
void *sda_base;
int (*main) (int, char **, char **, void *);
int (*init) (int, char **, char **, void *);
void (*fini) (void);
};
int
__libc_start_main (int argc, char **ubp_av, char **ubp_ev,
void *auxvec, void (*rtld_fini) (void),
struct startup_info *stinfo,
char **stack_on_entry)
#endif
{
#if defined __ia64__ || defined __powerpc64__
register void *r13 __asm ("r13") = thr_buf + 32768;
__asm ("" : : "r" (r13));
#elif defined __sparc__
register void *g6 __asm ("g6") = thr_buf + 32768;
# ifdef __arch64__
__thread_self = thr_buf + 32768;
# else
register void *__thread_self __asm ("g7") = thr_buf + 32768;
# endif
__asm ("" : : "r" (g6), "r" (__thread_self));
#elif defined __s390__ && !defined __s390x__
__asm ("sar %%a0,%0" : : "d" (thr_buf + 32768));
#elif defined __s390x__
__asm ("sar %%a1,%0; srlg 0,%0,32; sar %%a0,0" : : "d" (thr_buf + 32768) : "0");
#elif defined __powerpc__ && !defined __powerpc64__
register void *r2 __asm ("r2") = thr_buf + 32768;
__asm ("" : : "r" (r2));
#endif
main();
return 0;
}
#endif
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