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nspawn: mount boot ID from temporary file in /tmp

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Let's not make /run too special and let's make sure the source file is
not guessable: let's use our regular temporary file helper calls to
create the source node.
This commit is contained in:
Lennart Poettering 2018-04-30 21:20:50 +02:00
parent d4b653c589
commit cdde6ba6b6
1 changed files with 14 additions and 10 deletions
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24
src/nspawn/nspawn.c
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@ -1470,31 +1470,35 @@ static int setup_resolv_conf(const char *dest) {
}
static int setup_boot_id(void) {
_cleanup_(unlink_and_freep) char *from = NULL;
_cleanup_free_ char *path = NULL;
sd_id128_t rnd = SD_ID128_NULL;
const char *from, *to;
const char *to;
int r;
/* Generate a new randomized boot ID, so that each boot-up of
* the container gets a new one */
from = "/run/proc-sys-kernel-random-boot-id";
to = "/proc/sys/kernel/random/boot_id";
r = tempfn_random_child(NULL, "proc-sys-kernel-random-boot-id", &path);
if (r < 0)
return log_error_errno(r, "Failed to generate random boot ID path: %m");
r = sd_id128_randomize(&rnd);
if (r < 0)
return log_error_errno(r, "Failed to generate random boot id: %m");
r = id128_write(from, ID128_UUID, rnd, false);
r = id128_write(path, ID128_UUID, rnd, false);
if (r < 0)
return log_error_errno(r, "Failed to write boot id: %m");
r = mount_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
if (r >= 0)
r = mount_verbose(LOG_ERR, NULL, to, NULL,
MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
from = TAKE_PTR(path);
to = "/proc/sys/kernel/random/boot_id";
(void) unlink(from);
return r;
r = mount_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
if (r < 0)
return r;
return mount_verbose(LOG_ERR, NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
}
static int copy_devnodes(const char *dest) {