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authorAlban Crequy <alban@endocode.com>2015-05-18 16:45:30 +0200
committerLennart Poettering <lennart@poettering.net>2015-05-18 22:24:15 +0200
commit6b7d2e9ea4cdb4cfa1512d37548a1a967623d7f2 (patch)
tree6d5d468c937a6da40631af5d84621d6e6068f168 /src/nspawn/nspawn.c
parent8dc26de6da7a7611ecf0362ffc4f178569109d23 (diff)
nspawn: close extra fds before execing init
When systemd-nspawn gets exec*()ed, it inherits the followings file descriptors: - 0, 1, 2: stdin, stdout, stderr - SD_LISTEN_FDS_START, ... SD_LISTEN_FDS_START+LISTEN_FDS: file descriptors passed by the system manager (useful for socket activation). They are passed to the child process (process leader). - extra lock fd: rkt passes a locked directory as an extra fd, so the directory remains locked as long as the container is alive. systemd-nspawn used to close all open fds except 0, 1, 2 and the SD_LISTEN_FDS_START..SD_LISTEN_FDS_START+LISTEN_FDS. This patch delays the close just before the exec so the nspawn process (parent) keeps the extra fds open. This patch supersedes the previous attempt ("cloexec extraneous fds"): http://lists.freedesktop.org/archives/systemd-devel/2015-May/031608.html
Diffstat (limited to 'src/nspawn/nspawn.c')
-rw-r--r--src/nspawn/nspawn.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index 4095c77fdf..a38f47dd0a 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -3990,7 +3990,6 @@ int main(int argc, char *argv[]) {
goto finish;
}
- log_close();
n_fd_passed = sd_listen_fds(false);
if (n_fd_passed > 0) {
r = fdset_new_listen_fds(&fds, false);
@@ -3999,8 +3998,6 @@ int main(int argc, char *argv[]) {
goto finish;
}
}
- fdset_close_others(fds);
- log_open();
if (arg_directory) {
assert(!arg_image);
@@ -4510,6 +4507,17 @@ int main(int argc, char *argv[]) {
* setup, too... */
(void) barrier_place_and_sync(&barrier); /* #5 */
+ /* Now, explicitly close the log, so that we
+ * then can close all remaining fds. Closing
+ * the log explicitly first has the benefit
+ * that the logging subsystem knows about it,
+ * and is thus ready to be reopened should we
+ * need it again. Note that the other fds
+ * closed here are at least the locking and
+ * barrier fds. */
+ log_close();
+ (void) fdset_close_others(fds);
+
if (arg_boot) {
char **a;
size_t l;
@@ -4536,6 +4544,7 @@ int main(int argc, char *argv[]) {
execle("/bin/sh", "-sh", NULL, env_use);
}
+ (void) log_open();
log_error_errno(errno, "execv() failed: %m");
_exit(EXIT_FAILURE);
}