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nspawn: enable all controllers we can for the "payload" subcgroup we create

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In the unified hierarchy delegating controller access is safe, hence
make sure to enable all controllers for the "payload" subcgroup if we
create it, so that the container will have all controllers enabled the
nspawn service itself has.
This commit is contained in:
Lennart Poettering 2015-09-03 20:10:00 +02:00
parent 5f4c5fef66
commit 98e4d8d763
2 changed files with 8 additions and 1 deletions
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2
src/basic/cgroup-util.c
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@ -2163,7 +2163,7 @@ int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
r = write_string_file(fs, s, 0);
if (r < 0)
log_warning_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs);
log_debug_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs);
}
}

7
src/nspawn/nspawn.c
View File

@ -4737,6 +4737,7 @@ static int create_subcgroup(pid_t pid) {
_cleanup_free_ char *cgroup = NULL;
const char *child;
int unified, r;
CGroupMask supported;
/* In the unified hierarchy inner nodes may only only contain
* subgroups, but not processes. Hence, if we running in the
@ -4756,6 +4757,10 @@ static int create_subcgroup(pid_t pid) {
if (unified == 0)
return 0;
r = cg_mask_supported(&supported);
if (r < 0)
return log_error_errno(r, "Failed to determine supported controllers: %m");
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup);
if (r < 0)
return log_error_errno(r, "Failed to get our control group: %m");
@ -4770,6 +4775,8 @@ static int create_subcgroup(pid_t pid) {
if (r < 0)
return log_error_errno(r, "Failed to create %s subcgroup: %m", child);
/* Try to enable as many controllers as possible for the new payload. */
(void) cg_enable_everywhere(supported, supported, cgroup);
return 0;
}