Marcus Meissner
5715649b6b
I really want networkd with a functioning machinectl --network-veth (broken in 13.2). OBS-URL: https://build.opensuse.org/package/show/Base:System/systemd?expand=0&rev=844
120 lines
5.1 KiB
Diff
120 lines
5.1 KiB
Diff
Simply writing /var/lib/systemd/random-seed back to /dev/(u)random does not
|
|
increase the entropy bit count. Therefore use the RNDADDENTROPY ioctl to
|
|
write back the bytes and increase the entropy bit counter.
|
|
|
|
Related to bnc#892096
|
|
|
|
---
|
|
src/random-seed/random-seed.c | 65 +++++++++++++++++++++++++++++++++++++++---
|
|
1 file changed, 61 insertions(+), 4 deletions(-)
|
|
|
|
Index: systemd-218/src/random-seed/random-seed.c
|
|
===================================================================
|
|
--- systemd-218.orig/src/random-seed/random-seed.c
|
|
+++ systemd-218/src/random-seed/random-seed.c
|
|
@@ -22,7 +22,9 @@
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
+#include <linux/random.h>
|
|
#include <string.h>
|
|
+#include <sys/ioctl.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include "log.h"
|
|
@@ -32,8 +34,9 @@
|
|
#define POOL_SIZE_MIN 512
|
|
|
|
int main(int argc, char *argv[]) {
|
|
- _cleanup_close_ int seed_fd = -1, random_fd = -1;
|
|
+ _cleanup_close_ int seed_fd = -1, random_fd = -1, entropy_fd = -1;
|
|
_cleanup_free_ void* buf = NULL;
|
|
+ size_t entropy_count = 0;
|
|
size_t buf_size = 0;
|
|
ssize_t k;
|
|
int r;
|
|
@@ -82,6 +85,23 @@ int main(int argc, char *argv[]) {
|
|
|
|
if (streq(argv[1], "load")) {
|
|
|
|
+ entropy_fd = open(RANDOM_SEED_DIR "entropy_count", O_RDONLY|O_CLOEXEC|O_NOCTTY, 0600);
|
|
+ if (entropy_fd < 0) {
|
|
+ entropy_count = 0;
|
|
+ if (errno != ENOENT) {
|
|
+ log_error("Failed to open " RANDOM_SEED "/entropy_count: %m");
|
|
+ r = -errno;
|
|
+ goto finish;
|
|
+ }
|
|
+ } else {
|
|
+ r = read(entropy_fd, &entropy_count, sizeof(entropy_count));
|
|
+ if (r < 0) {
|
|
+ log_error("Failed to read entropy count file: %m");
|
|
+ r = -errno;
|
|
+ goto finish;
|
|
+ }
|
|
+ }
|
|
+
|
|
seed_fd = open(RANDOM_SEED, O_RDWR|O_CLOEXEC|O_NOCTTY|O_CREAT, 0600);
|
|
if (seed_fd < 0) {
|
|
seed_fd = open(RANDOM_SEED, O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
|
@@ -113,12 +133,34 @@ int main(int argc, char *argv[]) {
|
|
} else {
|
|
lseek(seed_fd, 0, SEEK_SET);
|
|
|
|
- r = loop_write(random_fd, buf, (size_t) k, false);
|
|
- if (r < 0)
|
|
- log_error_errno(r, "Failed to write seed to /dev/urandom: %m");
|
|
+ if (entropy_count && (size_t) k == buf_size) {
|
|
+ struct rand_pool_info entropy = {
|
|
+ .entropy_count = entropy_count,
|
|
+ .buf_size = buf_size,
|
|
+ };
|
|
+ entropy.buf[0] = ((__u32*)buf)[0];
|
|
+ r = ioctl(random_fd, RNDADDENTROPY, &entropy);
|
|
+ if (r < 0) {
|
|
+ log_error("Failed to write seed to /dev/urandom: %m");
|
|
+ r = -errno;
|
|
+ }
|
|
+ } else {
|
|
+ k = loop_write(random_fd, buf, (size_t) k, false);
|
|
+ if (k <= 0) {
|
|
+ log_error("Failed to write seed to /dev/urandom: %s", r < 0 ? strerror(-r) : "short write");
|
|
+ r = k == 0 ? -EIO : (int) k;
|
|
+ }
|
|
+ }
|
|
}
|
|
|
|
} else if (streq(argv[1], "save")) {
|
|
+ /* Read available entropy count, if possible */
|
|
+ f = fopen("/proc/sys/kernel/random/entropy_avail", "re");
|
|
+ if (f) {
|
|
+ if (fscanf(f, "%zu", &entropy_count) < 0)
|
|
+ entropy_count = 0;
|
|
+ fclose(f);
|
|
+ }
|
|
|
|
seed_fd = open(RANDOM_SEED, O_WRONLY|O_CLOEXEC|O_NOCTTY|O_CREAT, 0600);
|
|
if (seed_fd < 0) {
|
|
@@ -134,6 +176,21 @@ int main(int argc, char *argv[]) {
|
|
goto finish;
|
|
}
|
|
|
|
+ if (entropy_count) {
|
|
+ entropy_fd = open(RANDOM_SEED_DIR "entropy_count", O_WRONLY|O_CLOEXEC|O_NOCTTY|O_CREAT, 0600);
|
|
+ if (seed_fd < 0) {
|
|
+ log_error("Failed to open " RANDOM_SEED_DIR "entropy_count: %m");
|
|
+ r = -errno;
|
|
+ goto finish;
|
|
+ }
|
|
+ r = write(entropy_fd, &entropy_count, sizeof(entropy_count));
|
|
+ if (r < 0) {
|
|
+ log_error("Failed to write entropy count file: %m");
|
|
+ r = -errno;
|
|
+ goto finish;
|
|
+ }
|
|
+ }
|
|
+
|
|
} else {
|
|
log_error("Unknown verb %s.", argv[1]);
|
|
r = -EINVAL;
|