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core: split out one more function

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This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2019-11-08 16:19:43 +01:00
parent a9aac7d8dd
commit 8b139557fe
1 changed files with 74 additions and 63 deletions
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137
src/core/cgroup.c
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@ -955,6 +955,78 @@ static void cgroup_apply_firewall(Unit *u) {
(void) bpf_firewall_install(u);
}
static int cgroup_apply_devices(Unit *u) {
_cleanup_(bpf_program_unrefp) BPFProgram *prog = NULL;
const char *path;
CGroupContext *c;
CGroupDeviceAllow *a;
int r;
assert_se(c = unit_get_cgroup_context(u));
assert_se(path = u->cgroup_path);
if (cg_all_unified() > 0) {
r = bpf_devices_cgroup_init(&prog, c->device_policy, c->device_allow);
if (r < 0)
return log_unit_warning_errno(u, r, "Failed to initialize device control bpf program: %m");
} else {
/* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore
* EINVAL here. */
if (c->device_allow || c->device_policy != CGROUP_DEVICE_POLICY_AUTO)
r = cg_set_attribute("devices", path, "devices.deny", "a");
else
r = cg_set_attribute("devices", path, "devices.allow", "a");
if (r < 0)
log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
"Failed to reset devices.allow/devices.deny: %m");
}
if (c->device_policy == CGROUP_DEVICE_POLICY_CLOSED ||
(c->device_policy == CGROUP_DEVICE_POLICY_AUTO && c->device_allow))
(void) bpf_devices_whitelist_static(prog, path);
LIST_FOREACH(device_allow, a, c->device_allow) {
char acc[4], *val;
unsigned k = 0;
if (a->r)
acc[k++] = 'r';
if (a->w)
acc[k++] = 'w';
if (a->m)
acc[k++] = 'm';
if (k == 0)
continue;
acc[k++] = 0;
if (path_startswith(a->path, "/dev/"))
(void) bpf_devices_whitelist_device(prog, path, a->path, acc);
else if ((val = startswith(a->path, "block-")))
(void) bpf_devices_whitelist_major(prog, path, val, 'b', acc);
else if ((val = startswith(a->path, "char-")))
(void) bpf_devices_whitelist_major(prog, path, val, 'c', acc);
else
log_unit_debug(u, "Ignoring device '%s' while writing cgroup attribute.", a->path);
}
r = bpf_devices_apply_policy(u, prog, c->device_policy, c->device_allow);
if (r < 0) {
static bool warned = false;
log_full_errno(warned ? LOG_DEBUG : LOG_WARNING, r,
"Unit %s configures device ACL, but the local system doesn't seem to support the BPF-based device controller.\n"
"Proceeding WITHOUT applying ACL (all devices will be accessible)!\n"
"(This warning is only shown for the first loaded unit using device ACL.)", u->id);
warned = true;
}
return r;
}
static void cgroup_context_apply(
Unit *u,
CGroupMask apply_mask,
@ -1231,69 +1303,8 @@ static void cgroup_context_apply(
/* On cgroup v2 we can apply BPF everywhere. On cgroup v1 we apply it everywhere except for the root of
* containers, where we leave this to the manager */
if ((apply_mask & (CGROUP_MASK_DEVICES | CGROUP_MASK_BPF_DEVICES)) &&
(is_host_root || cg_all_unified() > 0 || !is_local_root)) {
_cleanup_(bpf_program_unrefp) BPFProgram *prog = NULL;
CGroupDeviceAllow *a;
if (cg_all_unified() > 0) {
r = bpf_devices_cgroup_init(&prog, c->device_policy, c->device_allow);
if (r < 0)
log_unit_warning_errno(u, r, "Failed to initialize device control bpf program: %m");
} else {
/* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore EINVAL
* here. */
if (c->device_allow || c->device_policy != CGROUP_DEVICE_POLICY_AUTO)
r = cg_set_attribute("devices", path, "devices.deny", "a");
else
r = cg_set_attribute("devices", path, "devices.allow", "a");
if (r < 0)
log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
"Failed to reset devices.allow/devices.deny: %m");
}
if (c->device_policy == CGROUP_DEVICE_POLICY_CLOSED ||
(c->device_policy == CGROUP_DEVICE_POLICY_AUTO && c->device_allow))
(void) bpf_devices_whitelist_static(prog, path);
LIST_FOREACH(device_allow, a, c->device_allow) {
char acc[4], *val;
unsigned k = 0;
if (a->r)
acc[k++] = 'r';
if (a->w)
acc[k++] = 'w';
if (a->m)
acc[k++] = 'm';
if (k == 0)
continue;
acc[k++] = 0;
if (path_startswith(a->path, "/dev/"))
(void) bpf_devices_whitelist_device(prog, path, a->path, acc);
else if ((val = startswith(a->path, "block-")))
(void) bpf_devices_whitelist_major(prog, path, val, 'b', acc);
else if ((val = startswith(a->path, "char-")))
(void) bpf_devices_whitelist_major(prog, path, val, 'c', acc);
else
log_unit_debug(u, "Ignoring device '%s' while writing cgroup attribute.", a->path);
}
r = bpf_devices_apply_policy(u, prog, c->device_policy, c->device_allow);
if (r < 0) {
static bool warned = false;
log_full_errno(warned ? LOG_DEBUG : LOG_WARNING, r,
"Unit %s configures device ACL, but the local system doesn't seem to support the BPF-based device controller.\n"
"Proceeding WITHOUT applying ACL (all devices will be accessible)!\n"
"(This warning is only shown for the first loaded unit using device ACL.)", u->id);
warned = true;
}
}
(is_host_root || cg_all_unified() > 0 || !is_local_root))
(void) cgroup_apply_devices(u);
if (apply_mask & CGROUP_MASK_PIDS) {