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switch-root: reopen /dev/console before we switch root

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This commit is contained in:
Lennart Poettering 2012-07-10 19:19:59 +02:00
parent 94163dd543
commit cd3bd60a2e
4 changed files with 37 additions and 23 deletions
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14
src/core/main.c
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@ -164,16 +164,11 @@ _noreturn_ static void crash(int sig) {
sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
if ((pid = fork()) < 0)
pid = fork();
if (pid < 0)
log_error("Failed to fork off crash shell: %s", strerror(errno));
else if (pid == 0) {
int fd, r;
if ((fd = acquire_terminal("/dev/console", false, true, true, (usec_t) -1)) < 0)
log_error("Failed to acquire terminal: %s", strerror(-fd));
else if ((r = make_stdio(fd)) < 0)
log_error("Failed to duplicate terminal fd: %s", strerror(-r));
make_console_stdio();
execl("/bin/sh", "/bin/sh", NULL);
log_error("execl() failed: %s", strerror(errno));
@ -1677,6 +1672,9 @@ finish:
* rebooted while we do that */
watchdog_close(true);
/* Reopen the console */
make_console_stdio();
if (switch_root_dir) {
r = switch_root(switch_root_dir);
if (r < 0)

22
src/core/shutdown.c
View File

@ -267,9 +267,10 @@ static int prepare_new_root(void) {
}
static int pivot_to_new_root(void) {
int fd;
chdir("/run/initramfs");
if (chdir("/run/initramfs") < 0) {
log_error("Failed to change directory to /run/initramfs: %m");
return -errno;
}
/*
In case some evil process made "/" MS_SHARED
@ -288,19 +289,12 @@ static int pivot_to_new_root(void) {
}
chroot(".");
setsid();
make_console_stdio();
log_info("Successfully changed into root pivot.");
fd = open("/dev/console", O_RDWR);
if (fd < 0)
log_error("Failed to open /dev/console: %m");
else {
make_stdio(fd);
/* Initialize the controlling terminal */
setsid();
ioctl(STDIN_FILENO, TIOCSCTTY, NULL);
}
return 0;
}

23
src/shared/util.c
View File

@ -2940,7 +2940,8 @@ int make_stdio(int fd) {
int make_null_stdio(void) {
int null_fd;
if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0)
null_fd = open("/dev/null", O_RDWR|O_NOCTTY);
if (null_fd < 0)
return -errno;
return make_stdio(null_fd);
@ -5844,3 +5845,23 @@ void warn_melody(void) {
ioctl(fd, KIOCSOUND, 0);
close_nointr_nofail(fd);
}
int make_console_stdio(void) {
int fd, r;
/* Make /dev/console the controlling terminal and stdin/stdout/stderr */
fd = acquire_terminal("/dev/console", false, true, true, (usec_t) -1);
if (fd < 0) {
log_error("Failed to acquire terminal: %s", strerror(-fd));
return fd;
}
r = make_stdio(fd);
if (r < 0) {
log_error("Failed to duplicate terminal fd: %s", strerror(-r));
return r;
}
return 0;
}

1
src/shared/util.h
View File

@ -278,6 +278,7 @@ char *format_timespan(char *buf, size_t l, usec_t t);
int make_stdio(int fd);
int make_null_stdio(void);
int make_console_stdio(void);
unsigned long long random_ull(void);