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5c1d971003
freebsd/sys/kern/kern_rctl.c
Andriy Gapon f87beb93e8 call racct_proc_ucred_changed() under the proc lock 
The lock is required to ensure that the switch to the new credentials
and the transfer of the process's accounting data from the old
credentials to the new ones is done atomically.  Otherwise, some updates
may be applied to the new credentials and then additionally transferred
from the old credentials if the updates happen after proc_set_cred() and
before racct_proc_ucred_changed().

The problem is especially pronounced for RACCT_RSS because
- there is a strict accounting for this resource (it's reclaimable)
- it's updated asynchronously by the vm daemon
- it's updated by setting an absolute value instead of applying a delta

I had to remove a call to rctl_proc_ucred_changed() from
racct_proc_ucred_changed() and make all callers of latter call the
former as well.  The reason is that rctl_proc_ucred_changed, as it is
implemented now, cannot be called while holding the proc lock, so the
lock is dropped after calling racct_proc_ucred_changed.  Additionally,
I've added calls to crhold / crfree around the rctl call, because
without the proc lock there is no gurantee that the new credentials,
owned by the process, will stay stable.  That does not eliminate a
possibility that the credentials passed to the rctl will get stale.
Ideally, rctl_proc_ucred_changed should be able to work under the proc
lock.

Many thanks to kib for pointing out the above problems.

PR:		222027
Discussed with:	kib
No comment:	trasz
MFC after:	2 weeks
Differential Revision: https://reviews.freebsd.org/D15048
2018-04-20 13:08:04 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2010 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/refcount.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/loginclass.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/racct.h>
#include <sys/rctl.h>
#include <sys/resourcevar.h>
#include <sys/sx.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/eventhandler.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rwlock.h>
#include <sys/sbuf.h>
#include <sys/taskqueue.h>
#include <sys/tree.h>
#include <vm/uma.h>
#ifdef RCTL
#ifndef RACCT
#error "The RCTL option requires the RACCT option"
#endif
FEATURE(rctl, "Resource Limits");
#define HRF_DEFAULT 0
#define HRF_DONT_INHERIT 1
#define HRF_DONT_ACCUMULATE 2
#define RCTL_MAX_INBUFSIZE 4 * 1024
#define RCTL_MAX_OUTBUFSIZE 16 * 1024 * 1024
#define RCTL_LOG_BUFSIZE 128
#define RCTL_PCPU_SHIFT (10 * 1000000)
static unsigned int rctl_maxbufsize = RCTL_MAX_OUTBUFSIZE;
static int rctl_log_rate_limit = 10;
static int rctl_devctl_rate_limit = 10;
/*
* Values below are initialized in rctl_init().
*/
static int rctl_throttle_min = -1;
static int rctl_throttle_max = -1;
static int rctl_throttle_pct = -1;
static int rctl_throttle_pct2 = -1;
static int rctl_throttle_min_sysctl(SYSCTL_HANDLER_ARGS);
static int rctl_throttle_max_sysctl(SYSCTL_HANDLER_ARGS);
static int rctl_throttle_pct_sysctl(SYSCTL_HANDLER_ARGS);
static int rctl_throttle_pct2_sysctl(SYSCTL_HANDLER_ARGS);
SYSCTL_NODE(_kern_racct, OID_AUTO, rctl, CTLFLAG_RW, 0, "Resource Limits");
SYSCTL_UINT(_kern_racct_rctl, OID_AUTO, maxbufsize, CTLFLAG_RWTUN,
&rctl_maxbufsize, 0, "Maximum output buffer size");
SYSCTL_UINT(_kern_racct_rctl, OID_AUTO, log_rate_limit, CTLFLAG_RW,
&rctl_log_rate_limit, 0, "Maximum number of log messages per second");
SYSCTL_UINT(_kern_racct_rctl, OID_AUTO, devctl_rate_limit, CTLFLAG_RWTUN,
&rctl_devctl_rate_limit, 0, "Maximum number of devctl messages per second");
SYSCTL_PROC(_kern_racct_rctl, OID_AUTO, throttle_min,
CTLTYPE_UINT | CTLFLAG_RWTUN, 0, 0, &rctl_throttle_min_sysctl, "IU",
"Shortest throttling duration, in hz");
TUNABLE_INT("kern.racct.rctl.throttle_min", &rctl_throttle_min);
SYSCTL_PROC(_kern_racct_rctl, OID_AUTO, throttle_max,
CTLTYPE_UINT | CTLFLAG_RWTUN, 0, 0, &rctl_throttle_max_sysctl, "IU",
"Longest throttling duration, in hz");
TUNABLE_INT("kern.racct.rctl.throttle_max", &rctl_throttle_max);
SYSCTL_PROC(_kern_racct_rctl, OID_AUTO, throttle_pct,
CTLTYPE_UINT | CTLFLAG_RWTUN, 0, 0, &rctl_throttle_pct_sysctl, "IU",
"Throttling penalty for process consumption, in percent");
TUNABLE_INT("kern.racct.rctl.throttle_pct", &rctl_throttle_pct);
SYSCTL_PROC(_kern_racct_rctl, OID_AUTO, throttle_pct2,
CTLTYPE_UINT | CTLFLAG_RWTUN, 0, 0, &rctl_throttle_pct2_sysctl, "IU",
"Throttling penalty for container consumption, in percent");
TUNABLE_INT("kern.racct.rctl.throttle_pct2", &rctl_throttle_pct2);
/*
* 'rctl_rule_link' connects a rule with every racct it's related to.
* For example, rule 'user:X:openfiles:deny=N/process' is linked
* with uidinfo for user X, and to each process of that user.
*/
struct rctl_rule_link {
LIST_ENTRY(rctl_rule_link) rrl_next;
struct rctl_rule *rrl_rule;
int rrl_exceeded;
};
struct dict {
const char *d_name;
int d_value;
};
static struct dict subjectnames[] = {
{ "process", RCTL_SUBJECT_TYPE_PROCESS },
{ "user", RCTL_SUBJECT_TYPE_USER },
{ "loginclass", RCTL_SUBJECT_TYPE_LOGINCLASS },
{ "jail", RCTL_SUBJECT_TYPE_JAIL },
{ NULL, -1 }};
static struct dict resourcenames[] = {
{ "cputime", RACCT_CPU },
{ "datasize", RACCT_DATA },
{ "stacksize", RACCT_STACK },
{ "coredumpsize", RACCT_CORE },
{ "memoryuse", RACCT_RSS },
{ "memorylocked", RACCT_MEMLOCK },
{ "maxproc", RACCT_NPROC },
{ "openfiles", RACCT_NOFILE },
{ "vmemoryuse", RACCT_VMEM },
{ "pseudoterminals", RACCT_NPTS },
{ "swapuse", RACCT_SWAP },
{ "nthr", RACCT_NTHR },
{ "msgqqueued", RACCT_MSGQQUEUED },
{ "msgqsize", RACCT_MSGQSIZE },
{ "nmsgq", RACCT_NMSGQ },
{ "nsem", RACCT_NSEM },
{ "nsemop", RACCT_NSEMOP },
{ "nshm", RACCT_NSHM },
{ "shmsize", RACCT_SHMSIZE },
{ "wallclock", RACCT_WALLCLOCK },
{ "pcpu", RACCT_PCTCPU },
{ "readbps", RACCT_READBPS },
{ "writebps", RACCT_WRITEBPS },
{ "readiops", RACCT_READIOPS },
{ "writeiops", RACCT_WRITEIOPS },
{ NULL, -1 }};
static struct dict actionnames[] = {
{ "sighup", RCTL_ACTION_SIGHUP },
{ "sigint", RCTL_ACTION_SIGINT },
{ "sigquit", RCTL_ACTION_SIGQUIT },
{ "sigill", RCTL_ACTION_SIGILL },
{ "sigtrap", RCTL_ACTION_SIGTRAP },
{ "sigabrt", RCTL_ACTION_SIGABRT },
{ "sigemt", RCTL_ACTION_SIGEMT },
{ "sigfpe", RCTL_ACTION_SIGFPE },
{ "sigkill", RCTL_ACTION_SIGKILL },
{ "sigbus", RCTL_ACTION_SIGBUS },
{ "sigsegv", RCTL_ACTION_SIGSEGV },
{ "sigsys", RCTL_ACTION_SIGSYS },
{ "sigpipe", RCTL_ACTION_SIGPIPE },
{ "sigalrm", RCTL_ACTION_SIGALRM },
{ "sigterm", RCTL_ACTION_SIGTERM },
{ "sigurg", RCTL_ACTION_SIGURG },
{ "sigstop", RCTL_ACTION_SIGSTOP },
{ "sigtstp", RCTL_ACTION_SIGTSTP },
{ "sigchld", RCTL_ACTION_SIGCHLD },
{ "sigttin", RCTL_ACTION_SIGTTIN },
{ "sigttou", RCTL_ACTION_SIGTTOU },
{ "sigio", RCTL_ACTION_SIGIO },
{ "sigxcpu", RCTL_ACTION_SIGXCPU },
{ "sigxfsz", RCTL_ACTION_SIGXFSZ },
{ "sigvtalrm", RCTL_ACTION_SIGVTALRM },
{ "sigprof", RCTL_ACTION_SIGPROF },
{ "sigwinch", RCTL_ACTION_SIGWINCH },
{ "siginfo", RCTL_ACTION_SIGINFO },
{ "sigusr1", RCTL_ACTION_SIGUSR1 },
{ "sigusr2", RCTL_ACTION_SIGUSR2 },
{ "sigthr", RCTL_ACTION_SIGTHR },
{ "deny", RCTL_ACTION_DENY },
{ "log", RCTL_ACTION_LOG },
{ "devctl", RCTL_ACTION_DEVCTL },
{ "throttle", RCTL_ACTION_THROTTLE },
{ NULL, -1 }};
static void rctl_init(void);
SYSINIT(rctl, SI_SUB_RACCT, SI_ORDER_FIRST, rctl_init, NULL);
static uma_zone_t rctl_rule_zone;
static uma_zone_t rctl_rule_link_zone;
static int rctl_rule_fully_specified(const struct rctl_rule *rule);
static void rctl_rule_to_sbuf(struct sbuf *sb, const struct rctl_rule *rule);
static MALLOC_DEFINE(M_RCTL, "rctl", "Resource Limits");
static int rctl_throttle_min_sysctl(SYSCTL_HANDLER_ARGS)
{
int error, val = rctl_throttle_min;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error || !req->newptr)
return (error);
if (val < 1 || val > rctl_throttle_max)
return (EINVAL);
RACCT_LOCK();
rctl_throttle_min = val;
RACCT_UNLOCK();
return (0);
}
static int rctl_throttle_max_sysctl(SYSCTL_HANDLER_ARGS)
{
int error, val = rctl_throttle_max;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error || !req->newptr)
return (error);
if (val < rctl_throttle_min)
return (EINVAL);
RACCT_LOCK();
rctl_throttle_max = val;
RACCT_UNLOCK();
return (0);
}
static int rctl_throttle_pct_sysctl(SYSCTL_HANDLER_ARGS)
{
int error, val = rctl_throttle_pct;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error || !req->newptr)
return (error);
if (val < 0)
return (EINVAL);
RACCT_LOCK();
rctl_throttle_pct = val;
RACCT_UNLOCK();
return (0);
}
static int rctl_throttle_pct2_sysctl(SYSCTL_HANDLER_ARGS)
{
int error, val = rctl_throttle_pct2;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error || !req->newptr)
return (error);
if (val < 0)
return (EINVAL);
RACCT_LOCK();
rctl_throttle_pct2 = val;
RACCT_UNLOCK();
return (0);
}
static const char *
rctl_subject_type_name(int subject)
{
int i;
for (i = 0; subjectnames[i].d_name != NULL; i++) {
if (subjectnames[i].d_value == subject)
return (subjectnames[i].d_name);
}
panic("rctl_subject_type_name: unknown subject type %d", subject);
}
static const char *
rctl_action_name(int action)
{
int i;
for (i = 0; actionnames[i].d_name != NULL; i++) {
if (actionnames[i].d_value == action)
return (actionnames[i].d_name);
}
panic("rctl_action_name: unknown action %d", action);
}
const char *
rctl_resource_name(int resource)
{
int i;
for (i = 0; resourcenames[i].d_name != NULL; i++) {
if (resourcenames[i].d_value == resource)
return (resourcenames[i].d_name);
}
panic("rctl_resource_name: unknown resource %d", resource);
}
static struct racct *
rctl_proc_rule_to_racct(const struct proc *p, const struct rctl_rule *rule)
{
struct ucred *cred = p->p_ucred;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
switch (rule->rr_per) {
case RCTL_SUBJECT_TYPE_PROCESS:
return (p->p_racct);
case RCTL_SUBJECT_TYPE_USER:
return (cred->cr_ruidinfo->ui_racct);
case RCTL_SUBJECT_TYPE_LOGINCLASS:
return (cred->cr_loginclass->lc_racct);
case RCTL_SUBJECT_TYPE_JAIL:
return (cred->cr_prison->pr_prison_racct->prr_racct);
default:
panic("%s: unknown per %d", __func__, rule->rr_per);
}
}
/*
* Return the amount of resource that can be allocated by 'p' before
* hitting 'rule'.
*/
static int64_t
rctl_available_resource(const struct proc *p, const struct rctl_rule *rule)
{
const struct racct *racct;
int64_t available;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
racct = rctl_proc_rule_to_racct(p, rule);
available = rule->rr_amount - racct->r_resources[rule->rr_resource];
return (available);
}
/*
* Called every second for proc, uidinfo, loginclass, and jail containers.
* If the limit isn't exceeded, it decreases the usage amount to zero.
* Otherwise, it decreases it by the value of the limit. This way
* resource consumption exceeding the limit "carries over" to the next
* period.
*/
void
rctl_throttle_decay(struct racct *racct, int resource)
{
struct rctl_rule *rule;
struct rctl_rule_link *link;
int64_t minavailable;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
minavailable = INT64_MAX;
LIST_FOREACH(link, &racct->r_rule_links, rrl_next) {
rule = link->rrl_rule;
if (rule->rr_resource != resource)
continue;
if (rule->rr_action != RCTL_ACTION_THROTTLE)
continue;
if (rule->rr_amount < minavailable)
minavailable = rule->rr_amount;
}
if (racct->r_resources[resource] < minavailable) {
racct->r_resources[resource] = 0;
} else {
/*
* Cap utilization counter at ten times the limit. Otherwise,
* if we changed the rule lowering the allowed amount, it could
* take unreasonably long time for the accumulated resource
* usage to drop.
*/
if (racct->r_resources[resource] > minavailable * 10)
racct->r_resources[resource] = minavailable * 10;
racct->r_resources[resource] -= minavailable;
}
}
/*
* Special version of rctl_get_available() for the %CPU resource.
* We slightly cheat here and return less than we normally would.
*/
int64_t
rctl_pcpu_available(const struct proc *p) {
struct rctl_rule *rule;
struct rctl_rule_link *link;
int64_t available, minavailable, limit;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
minavailable = INT64_MAX;
limit = 0;
LIST_FOREACH(link, &p->p_racct->r_rule_links, rrl_next) {
rule = link->rrl_rule;
if (rule->rr_resource != RACCT_PCTCPU)
continue;
if (rule->rr_action != RCTL_ACTION_DENY)
continue;
available = rctl_available_resource(p, rule);
if (available < minavailable) {
minavailable = available;
limit = rule->rr_amount;
}
}
/*
* Return slightly less than actual value of the available
* %cpu resource. This makes %cpu throttling more aggressive
* and lets us act sooner than the limits are already exceeded.
*/
if (limit != 0) {
if (limit > 2 * RCTL_PCPU_SHIFT)
minavailable -= RCTL_PCPU_SHIFT;
else
minavailable -= (limit / 2);
}
return (minavailable);
}
static uint64_t
xadd(uint64_t a, uint64_t b)
{
uint64_t c;
c = a + b;
/*
* Detect overflow.
*/
if (c < a || c < b)
return (UINT64_MAX);
return (c);
}
static uint64_t
xmul(uint64_t a, uint64_t b)
{
if (b != 0 && a > UINT64_MAX / b)
return (UINT64_MAX);
return (a * b);
}
/*
* Check whether the proc 'p' can allocate 'amount' of 'resource' in addition
* to what it keeps allocated now. Returns non-zero if the allocation should
* be denied, 0 otherwise.
*/
int
rctl_enforce(struct proc *p, int resource, uint64_t amount)
{
static struct timeval log_lasttime, devctl_lasttime;
static int log_curtime = 0, devctl_curtime = 0;
struct rctl_rule *rule;
struct rctl_rule_link *link;
struct sbuf sb;
char *buf;
int64_t available;
uint64_t sleep_ms, sleep_ratio;
int should_deny = 0;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
/*
* There may be more than one matching rule; go through all of them.
* Denial should be done last, after logging and sending signals.
*/
LIST_FOREACH(link, &p->p_racct->r_rule_links, rrl_next) {
rule = link->rrl_rule;
if (rule->rr_resource != resource)
continue;
available = rctl_available_resource(p, rule);
if (available >= (int64_t)amount) {
link->rrl_exceeded = 0;
continue;
}
switch (rule->rr_action) {
case RCTL_ACTION_DENY:
should_deny = 1;
continue;
case RCTL_ACTION_LOG:
/*
* If rrl_exceeded != 0, it means we've already
* logged a warning for this process.
*/
if (link->rrl_exceeded != 0)
continue;
/*
* If the process state is not fully initialized yet,
* we can't access most of the required fields, e.g.
* p->p_comm. This happens when called from fork1().
* Ignore this rule for now; it will be processed just
* after fork, when called from racct_proc_fork_done().
*/
if (p->p_state != PRS_NORMAL)
continue;
if (!ppsratecheck(&log_lasttime, &log_curtime,
rctl_log_rate_limit))
continue;
buf = malloc(RCTL_LOG_BUFSIZE, M_RCTL, M_NOWAIT);
if (buf == NULL) {
printf("rctl_enforce: out of memory\n");
continue;
}
sbuf_new(&sb, buf, RCTL_LOG_BUFSIZE, SBUF_FIXEDLEN);
rctl_rule_to_sbuf(&sb, rule);
sbuf_finish(&sb);
printf("rctl: rule \"%s\" matched by pid %d "
"(%s), uid %d, jail %s\n", sbuf_data(&sb),
p->p_pid, p->p_comm, p->p_ucred->cr_uid,
p->p_ucred->cr_prison->pr_prison_racct->prr_name);
sbuf_delete(&sb);
free(buf, M_RCTL);
link->rrl_exceeded = 1;
continue;
case RCTL_ACTION_DEVCTL:
if (link->rrl_exceeded != 0)
continue;
if (p->p_state != PRS_NORMAL)
continue;
if (!ppsratecheck(&devctl_lasttime, &devctl_curtime,
rctl_devctl_rate_limit))
continue;
buf = malloc(RCTL_LOG_BUFSIZE, M_RCTL, M_NOWAIT);
if (buf == NULL) {
printf("rctl_enforce: out of memory\n");
continue;
}
sbuf_new(&sb, buf, RCTL_LOG_BUFSIZE, SBUF_FIXEDLEN);
sbuf_printf(&sb, "rule=");
rctl_rule_to_sbuf(&sb, rule);
sbuf_printf(&sb, " pid=%d ruid=%d jail=%s",
p->p_pid, p->p_ucred->cr_ruid,
p->p_ucred->cr_prison->pr_prison_racct->prr_name);
sbuf_finish(&sb);
devctl_notify_f("RCTL", "rule", "matched",
sbuf_data(&sb), M_NOWAIT);
sbuf_delete(&sb);
free(buf, M_RCTL);
link->rrl_exceeded = 1;
continue;
case RCTL_ACTION_THROTTLE:
if (p->p_state != PRS_NORMAL)
continue;
/*
* Make the process sleep for a fraction of second
* proportional to the ratio of process' resource
* utilization compared to the limit. The point is
* to penalize resource hogs: processes that consume
* more of the available resources sleep for longer.
*
* We're trying to defer division until the very end,
* to minimize the rounding effects. The following
* calculation could have been written in a clearer
* way like this:
*
* sleep_ms = hz * p->p_racct->r_resources[resource] /
* rule->rr_amount;
* sleep_ms *= rctl_throttle_pct / 100;
* if (sleep_ms < rctl_throttle_min)
* sleep_ms = rctl_throttle_min;
*
*/
sleep_ms = xmul(hz, p->p_racct->r_resources[resource]);
sleep_ms = xmul(sleep_ms, rctl_throttle_pct) / 100;
if (sleep_ms < rctl_throttle_min * rule->rr_amount)
sleep_ms = rctl_throttle_min * rule->rr_amount;
/*
* Multiply that by the ratio of the resource
* consumption for the container compared to the limit,
* squared. In other words, a process in a container
* that is two times over the limit will be throttled
* four times as much for hitting the same rule. The
* point is to penalize processes more if the container
* itself (eg certain UID or jail) is above the limit.
*/
if (available < 0)
sleep_ratio = -available / rule->rr_amount;
else
sleep_ratio = 0;
sleep_ratio = xmul(sleep_ratio, sleep_ratio);
sleep_ratio = xmul(sleep_ratio, rctl_throttle_pct2) / 100;
sleep_ms = xadd(sleep_ms, xmul(sleep_ms, sleep_ratio));
/*
* Finally the division.
*/
sleep_ms /= rule->rr_amount;
if (sleep_ms > rctl_throttle_max)
sleep_ms = rctl_throttle_max;
#if 0
printf("%s: pid %d (%s), %jd of %jd, will sleep for %ju ms (ratio %ju, available %jd)\n",
__func__, p->p_pid, p->p_comm,
p->p_racct->r_resources[resource],
rule->rr_amount, (uintmax_t)sleep_ms,
(uintmax_t)sleep_ratio, (intmax_t)available);
#endif
KASSERT(sleep_ms >= rctl_throttle_min, ("%s: %ju < %d\n",
__func__, (uintmax_t)sleep_ms, rctl_throttle_min));
racct_proc_throttle(p, sleep_ms);
continue;
default:
if (link->rrl_exceeded != 0)
continue;
if (p->p_state != PRS_NORMAL)
continue;
KASSERT(rule->rr_action > 0 &&
rule->rr_action <= RCTL_ACTION_SIGNAL_MAX,
("rctl_enforce: unknown action %d",
rule->rr_action));
/*
* We're using the fact that RCTL_ACTION_SIG* values
* are equal to their counterparts from sys/signal.h.
*/
kern_psignal(p, rule->rr_action);
link->rrl_exceeded = 1;
continue;
}
}
if (should_deny) {
/*
* Return fake error code; the caller should change it
* into one proper for the situation - EFSIZ, ENOMEM etc.
*/
return (EDOOFUS);
}
return (0);
}
uint64_t
rctl_get_limit(struct proc *p, int resource)
{
struct rctl_rule *rule;
struct rctl_rule_link *link;
uint64_t amount = UINT64_MAX;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
/*
* There may be more than one matching rule; go through all of them.
* Denial should be done last, after logging and sending signals.
*/
LIST_FOREACH(link, &p->p_racct->r_rule_links, rrl_next) {
rule = link->rrl_rule;
if (rule->rr_resource != resource)
continue;
if (rule->rr_action != RCTL_ACTION_DENY)
continue;
if (rule->rr_amount < amount)
amount = rule->rr_amount;
}
return (amount);
}
uint64_t
rctl_get_available(struct proc *p, int resource)
{
struct rctl_rule *rule;
struct rctl_rule_link *link;
int64_t available, minavailable, allocated;
minavailable = INT64_MAX;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
/*
* There may be more than one matching rule; go through all of them.
* Denial should be done last, after logging and sending signals.
*/
LIST_FOREACH(link, &p->p_racct->r_rule_links, rrl_next) {
rule = link->rrl_rule;
if (rule->rr_resource != resource)
continue;
if (rule->rr_action != RCTL_ACTION_DENY)
continue;
available = rctl_available_resource(p, rule);
if (available < minavailable)
minavailable = available;
}
/*
* XXX: Think about this _hard_.
*/
allocated = p->p_racct->r_resources[resource];
if (minavailable < INT64_MAX - allocated)
minavailable += allocated;
if (minavailable < 0)
minavailable = 0;
return (minavailable);
}
static int
rctl_rule_matches(const struct rctl_rule *rule, const struct rctl_rule *filter)
{
ASSERT_RACCT_ENABLED();
if (filter->rr_subject_type != RCTL_SUBJECT_TYPE_UNDEFINED) {
if (rule->rr_subject_type != filter->rr_subject_type)
return (0);
switch (filter->rr_subject_type) {
case RCTL_SUBJECT_TYPE_PROCESS:
if (filter->rr_subject.rs_proc != NULL &&
rule->rr_subject.rs_proc !=
filter->rr_subject.rs_proc)
return (0);
break;
case RCTL_SUBJECT_TYPE_USER:
if (filter->rr_subject.rs_uip != NULL &&
rule->rr_subject.rs_uip !=
filter->rr_subject.rs_uip)
return (0);
break;
case RCTL_SUBJECT_TYPE_LOGINCLASS:
if (filter->rr_subject.rs_loginclass != NULL &&
rule->rr_subject.rs_loginclass !=
filter->rr_subject.rs_loginclass)
return (0);
break;
case RCTL_SUBJECT_TYPE_JAIL:
if (filter->rr_subject.rs_prison_racct != NULL &&
rule->rr_subject.rs_prison_racct !=
filter->rr_subject.rs_prison_racct)
return (0);
break;
default:
panic("rctl_rule_matches: unknown subject type %d",
filter->rr_subject_type);
}
}
if (filter->rr_resource != RACCT_UNDEFINED) {
if (rule->rr_resource != filter->rr_resource)
return (0);
}
if (filter->rr_action != RCTL_ACTION_UNDEFINED) {
if (rule->rr_action != filter->rr_action)
return (0);
}
if (filter->rr_amount != RCTL_AMOUNT_UNDEFINED) {
if (rule->rr_amount != filter->rr_amount)
return (0);
}
if (filter->rr_per != RCTL_SUBJECT_TYPE_UNDEFINED) {
if (rule->rr_per != filter->rr_per)
return (0);
}
return (1);
}
static int
str2value(const char *str, int *value, struct dict *table)
{
int i;
if (value == NULL)
return (EINVAL);
for (i = 0; table[i].d_name != NULL; i++) {
if (strcasecmp(table[i].d_name, str) == 0) {
*value = table[i].d_value;
return (0);
}
}
return (EINVAL);
}
static int
str2id(const char *str, id_t *value)
{
char *end;
if (str == NULL)
return (EINVAL);
*value = strtoul(str, &end, 10);
if ((size_t)(end - str) != strlen(str))
return (EINVAL);
return (0);
}
static int
str2int64(const char *str, int64_t *value)
{
char *end;
if (str == NULL)
return (EINVAL);
*value = strtoul(str, &end, 10);
if ((size_t)(end - str) != strlen(str))
return (EINVAL);
if (*value < 0)
return (ERANGE);
return (0);
}
/*
* Connect the rule to the racct, increasing refcount for the rule.
*/
static void
rctl_racct_add_rule(struct racct *racct, struct rctl_rule *rule)
{
struct rctl_rule_link *link;
ASSERT_RACCT_ENABLED();
KASSERT(rctl_rule_fully_specified(rule), ("rule not fully specified"));
rctl_rule_acquire(rule);
link = uma_zalloc(rctl_rule_link_zone, M_WAITOK);
link->rrl_rule = rule;
link->rrl_exceeded = 0;
RACCT_LOCK();
LIST_INSERT_HEAD(&racct->r_rule_links, link, rrl_next);
RACCT_UNLOCK();
}
static int
rctl_racct_add_rule_locked(struct racct *racct, struct rctl_rule *rule)
{
struct rctl_rule_link *link;
ASSERT_RACCT_ENABLED();
KASSERT(rctl_rule_fully_specified(rule), ("rule not fully specified"));
RACCT_LOCK_ASSERT();
link = uma_zalloc(rctl_rule_link_zone, M_NOWAIT);
if (link == NULL)
return (ENOMEM);
rctl_rule_acquire(rule);
link->rrl_rule = rule;
link->rrl_exceeded = 0;
LIST_INSERT_HEAD(&racct->r_rule_links, link, rrl_next);
return (0);
}
/*
* Remove limits for a rules matching the filter and release
* the refcounts for the rules, possibly freeing them. Returns
* the number of limit structures removed.
*/
static int
rctl_racct_remove_rules(struct racct *racct,
const struct rctl_rule *filter)
{
struct rctl_rule_link *link, *linktmp;
int removed = 0;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
LIST_FOREACH_SAFE(link, &racct->r_rule_links, rrl_next, linktmp) {
if (!rctl_rule_matches(link->rrl_rule, filter))
continue;
LIST_REMOVE(link, rrl_next);
rctl_rule_release(link->rrl_rule);
uma_zfree(rctl_rule_link_zone, link);
removed++;
}
return (removed);
}
static void
rctl_rule_acquire_subject(struct rctl_rule *rule)
{
ASSERT_RACCT_ENABLED();
switch (rule->rr_subject_type) {
case RCTL_SUBJECT_TYPE_UNDEFINED:
case RCTL_SUBJECT_TYPE_PROCESS:
break;
case RCTL_SUBJECT_TYPE_JAIL:
if (rule->rr_subject.rs_prison_racct != NULL)
prison_racct_hold(rule->rr_subject.rs_prison_racct);
break;
case RCTL_SUBJECT_TYPE_USER:
if (rule->rr_subject.rs_uip != NULL)
uihold(rule->rr_subject.rs_uip);
break;
case RCTL_SUBJECT_TYPE_LOGINCLASS:
if (rule->rr_subject.rs_loginclass != NULL)
loginclass_hold(rule->rr_subject.rs_loginclass);
break;
default:
panic("rctl_rule_acquire_subject: unknown subject type %d",
rule->rr_subject_type);
}
}
static void
rctl_rule_release_subject(struct rctl_rule *rule)
{
ASSERT_RACCT_ENABLED();
switch (rule->rr_subject_type) {
case RCTL_SUBJECT_TYPE_UNDEFINED:
case RCTL_SUBJECT_TYPE_PROCESS:
break;
case RCTL_SUBJECT_TYPE_JAIL:
if (rule->rr_subject.rs_prison_racct != NULL)
prison_racct_free(rule->rr_subject.rs_prison_racct);
break;
case RCTL_SUBJECT_TYPE_USER:
if (rule->rr_subject.rs_uip != NULL)
uifree(rule->rr_subject.rs_uip);
break;
case RCTL_SUBJECT_TYPE_LOGINCLASS:
if (rule->rr_subject.rs_loginclass != NULL)
loginclass_free(rule->rr_subject.rs_loginclass);
break;
default:
panic("rctl_rule_release_subject: unknown subject type %d",
rule->rr_subject_type);
}
}
struct rctl_rule *
rctl_rule_alloc(int flags)
{
struct rctl_rule *rule;
ASSERT_RACCT_ENABLED();
rule = uma_zalloc(rctl_rule_zone, flags);
if (rule == NULL)
return (NULL);
rule->rr_subject_type = RCTL_SUBJECT_TYPE_UNDEFINED;
rule->rr_subject.rs_proc = NULL;
rule->rr_subject.rs_uip = NULL;
rule->rr_subject.rs_loginclass = NULL;
rule->rr_subject.rs_prison_racct = NULL;
rule->rr_per = RCTL_SUBJECT_TYPE_UNDEFINED;
rule->rr_resource = RACCT_UNDEFINED;
rule->rr_action = RCTL_ACTION_UNDEFINED;
rule->rr_amount = RCTL_AMOUNT_UNDEFINED;
refcount_init(&rule->rr_refcount, 1);
return (rule);
}
struct rctl_rule *
rctl_rule_duplicate(const struct rctl_rule *rule, int flags)
{
struct rctl_rule *copy;
ASSERT_RACCT_ENABLED();
copy = uma_zalloc(rctl_rule_zone, flags);
if (copy == NULL)
return (NULL);
copy->rr_subject_type = rule->rr_subject_type;
copy->rr_subject.rs_proc = rule->rr_subject.rs_proc;
copy->rr_subject.rs_uip = rule->rr_subject.rs_uip;
copy->rr_subject.rs_loginclass = rule->rr_subject.rs_loginclass;
copy->rr_subject.rs_prison_racct = rule->rr_subject.rs_prison_racct;
copy->rr_per = rule->rr_per;
copy->rr_resource = rule->rr_resource;
copy->rr_action = rule->rr_action;
copy->rr_amount = rule->rr_amount;
refcount_init(&copy->rr_refcount, 1);
rctl_rule_acquire_subject(copy);
return (copy);
}
void
rctl_rule_acquire(struct rctl_rule *rule)
{
ASSERT_RACCT_ENABLED();
KASSERT(rule->rr_refcount > 0, ("rule->rr_refcount <= 0"));
refcount_acquire(&rule->rr_refcount);
}
static void
rctl_rule_free(void *context, int pending)
{
struct rctl_rule *rule;
rule = (struct rctl_rule *)context;
ASSERT_RACCT_ENABLED();
KASSERT(rule->rr_refcount == 0, ("rule->rr_refcount != 0"));
/*
* We don't need locking here; rule is guaranteed to be inaccessible.
*/
rctl_rule_release_subject(rule);
uma_zfree(rctl_rule_zone, rule);
}
void
rctl_rule_release(struct rctl_rule *rule)
{
ASSERT_RACCT_ENABLED();
KASSERT(rule->rr_refcount > 0, ("rule->rr_refcount <= 0"));
if (refcount_release(&rule->rr_refcount)) {
/*
* rctl_rule_release() is often called when iterating
* over all the uidinfo structures in the system,
* holding uihashtbl_lock. Since rctl_rule_free()
* might end up calling uifree(), this would lead
* to lock recursion. Use taskqueue to avoid this.
*/
TASK_INIT(&rule->rr_task, 0, rctl_rule_free, rule);
taskqueue_enqueue(taskqueue_thread, &rule->rr_task);
}
}
static int
rctl_rule_fully_specified(const struct rctl_rule *rule)
{
ASSERT_RACCT_ENABLED();
switch (rule->rr_subject_type) {
case RCTL_SUBJECT_TYPE_UNDEFINED:
return (0);
case RCTL_SUBJECT_TYPE_PROCESS:
if (rule->rr_subject.rs_proc == NULL)
return (0);
break;
case RCTL_SUBJECT_TYPE_USER:
if (rule->rr_subject.rs_uip == NULL)
return (0);
break;
case RCTL_SUBJECT_TYPE_LOGINCLASS:
if (rule->rr_subject.rs_loginclass == NULL)
return (0);
break;
case RCTL_SUBJECT_TYPE_JAIL:
if (rule->rr_subject.rs_prison_racct == NULL)
return (0);
break;
default:
panic("rctl_rule_fully_specified: unknown subject type %d",
rule->rr_subject_type);
}
if (rule->rr_resource == RACCT_UNDEFINED)
return (0);
if (rule->rr_action == RCTL_ACTION_UNDEFINED)
return (0);
if (rule->rr_amount == RCTL_AMOUNT_UNDEFINED)
return (0);
if (rule->rr_per == RCTL_SUBJECT_TYPE_UNDEFINED)
return (0);
return (1);
}
static int
rctl_string_to_rule(char *rulestr, struct rctl_rule **rulep)
{
struct rctl_rule *rule;
char *subjectstr, *subject_idstr, *resourcestr, *actionstr,
*amountstr, *perstr;
id_t id;
int error = 0;
ASSERT_RACCT_ENABLED();
rule = rctl_rule_alloc(M_WAITOK);
subjectstr = strsep(&rulestr, ":");
subject_idstr = strsep(&rulestr, ":");
resourcestr = strsep(&rulestr, ":");
actionstr = strsep(&rulestr, "=/");
amountstr = strsep(&rulestr, "/");
perstr = rulestr;
if (subjectstr == NULL || subjectstr[0] == '\0')
rule->rr_subject_type = RCTL_SUBJECT_TYPE_UNDEFINED;
else {
error = str2value(subjectstr, &rule->rr_subject_type, subjectnames);
if (error != 0)
goto out;
}
if (subject_idstr == NULL || subject_idstr[0] == '\0') {
rule->rr_subject.rs_proc = NULL;
rule->rr_subject.rs_uip = NULL;
rule->rr_subject.rs_loginclass = NULL;
rule->rr_subject.rs_prison_racct = NULL;
} else {
switch (rule->rr_subject_type) {
case RCTL_SUBJECT_TYPE_UNDEFINED:
error = EINVAL;
goto out;
case RCTL_SUBJECT_TYPE_PROCESS:
error = str2id(subject_idstr, &id);
if (error != 0)
goto out;
sx_assert(&allproc_lock, SA_LOCKED);
rule->rr_subject.rs_proc = pfind(id);
if (rule->rr_subject.rs_proc == NULL) {
error = ESRCH;
goto out;
}
PROC_UNLOCK(rule->rr_subject.rs_proc);
break;
case RCTL_SUBJECT_TYPE_USER:
error = str2id(subject_idstr, &id);
if (error != 0)
goto out;
rule->rr_subject.rs_uip = uifind(id);
break;
case RCTL_SUBJECT_TYPE_LOGINCLASS:
rule->rr_subject.rs_loginclass =
loginclass_find(subject_idstr);
if (rule->rr_subject.rs_loginclass == NULL) {
error = ENAMETOOLONG;
goto out;
}
break;
case RCTL_SUBJECT_TYPE_JAIL:
rule->rr_subject.rs_prison_racct =
prison_racct_find(subject_idstr);
if (rule->rr_subject.rs_prison_racct == NULL) {
error = ENAMETOOLONG;
goto out;
}
break;
default:
panic("rctl_string_to_rule: unknown subject type %d",
rule->rr_subject_type);
}
}
if (resourcestr == NULL || resourcestr[0] == '\0')
rule->rr_resource = RACCT_UNDEFINED;
else {
error = str2value(resourcestr, &rule->rr_resource,
resourcenames);
if (error != 0)
goto out;
}
if (actionstr == NULL || actionstr[0] == '\0')
rule->rr_action = RCTL_ACTION_UNDEFINED;
else {
error = str2value(actionstr, &rule->rr_action, actionnames);
if (error != 0)
goto out;
}
if (amountstr == NULL || amountstr[0] == '\0')
rule->rr_amount = RCTL_AMOUNT_UNDEFINED;
else {
error = str2int64(amountstr, &rule->rr_amount);
if (error != 0)
goto out;
if (RACCT_IS_IN_MILLIONS(rule->rr_resource)) {
if (rule->rr_amount > INT64_MAX / 1000000) {
error = ERANGE;
goto out;
}
rule->rr_amount *= 1000000;
}
}
if (perstr == NULL || perstr[0] == '\0')
rule->rr_per = RCTL_SUBJECT_TYPE_UNDEFINED;
else {
error = str2value(perstr, &rule->rr_per, subjectnames);
if (error != 0)
goto out;
}
out:
if (error == 0)
*rulep = rule;
else
rctl_rule_release(rule);
return (error);
}
/*
* Link a rule with all the subjects it applies to.
*/
int
rctl_rule_add(struct rctl_rule *rule)
{
struct proc *p;
struct ucred *cred;
struct uidinfo *uip;
struct prison *pr;
struct prison_racct *prr;
struct loginclass *lc;
struct rctl_rule *rule2;
int match;
ASSERT_RACCT_ENABLED();
KASSERT(rctl_rule_fully_specified(rule), ("rule not fully specified"));
/*
* Some rules just don't make sense, like "deny" rule for an undeniable
* resource. The exception are the RSS and %CPU resources - they are
* not deniable in the racct sense, but the limit is enforced in
* a different way.
*/
if (rule->rr_action == RCTL_ACTION_DENY &&
!RACCT_IS_DENIABLE(rule->rr_resource) &&
rule->rr_resource != RACCT_RSS &&
rule->rr_resource != RACCT_PCTCPU) {
return (EOPNOTSUPP);
}
if (rule->rr_action == RCTL_ACTION_THROTTLE &&
!RACCT_IS_DECAYING(rule->rr_resource)) {
return (EOPNOTSUPP);
}
if (rule->rr_action == RCTL_ACTION_THROTTLE &&
rule->rr_resource == RACCT_PCTCPU) {
return (EOPNOTSUPP);
}
if (rule->rr_per == RCTL_SUBJECT_TYPE_PROCESS &&
RACCT_IS_SLOPPY(rule->rr_resource)) {
return (EOPNOTSUPP);
}
/*
* Make sure there are no duplicated rules. Also, for the "deny"
* rules, remove ones differing only by "amount".
*/
if (rule->rr_action == RCTL_ACTION_DENY) {
rule2 = rctl_rule_duplicate(rule, M_WAITOK);
rule2->rr_amount = RCTL_AMOUNT_UNDEFINED;
rctl_rule_remove(rule2);
rctl_rule_release(rule2);
} else
rctl_rule_remove(rule);
switch (rule->rr_subject_type) {
case RCTL_SUBJECT_TYPE_PROCESS:
p = rule->rr_subject.rs_proc;
KASSERT(p != NULL, ("rctl_rule_add: NULL proc"));
rctl_racct_add_rule(p->p_racct, rule);
/*
* In case of per-process rule, we don't have anything more
* to do.
*/
return (0);
case RCTL_SUBJECT_TYPE_USER:
uip = rule->rr_subject.rs_uip;
KASSERT(uip != NULL, ("rctl_rule_add: NULL uip"));
rctl_racct_add_rule(uip->ui_racct, rule);
break;
case RCTL_SUBJECT_TYPE_LOGINCLASS:
lc = rule->rr_subject.rs_loginclass;
KASSERT(lc != NULL, ("rctl_rule_add: NULL loginclass"));
rctl_racct_add_rule(lc->lc_racct, rule);
break;
case RCTL_SUBJECT_TYPE_JAIL:
prr = rule->rr_subject.rs_prison_racct;
KASSERT(prr != NULL, ("rctl_rule_add: NULL pr"));
rctl_racct_add_rule(prr->prr_racct, rule);
break;
default:
panic("rctl_rule_add: unknown subject type %d",
rule->rr_subject_type);
}
/*
* Now go through all the processes and add the new rule to the ones
* it applies to.
*/
sx_assert(&allproc_lock, SA_LOCKED);
FOREACH_PROC_IN_SYSTEM(p) {
cred = p->p_ucred;
switch (rule->rr_subject_type) {
case RCTL_SUBJECT_TYPE_USER:
if (cred->cr_uidinfo == rule->rr_subject.rs_uip ||
cred->cr_ruidinfo == rule->rr_subject.rs_uip)
break;
continue;
case RCTL_SUBJECT_TYPE_LOGINCLASS:
if (cred->cr_loginclass == rule->rr_subject.rs_loginclass)
break;
continue;
case RCTL_SUBJECT_TYPE_JAIL:
match = 0;
for (pr = cred->cr_prison; pr != NULL; pr = pr->pr_parent) {
if (pr->pr_prison_racct == rule->rr_subject.rs_prison_racct) {
match = 1;
break;
}
}
if (match)
break;
continue;
default:
panic("rctl_rule_add: unknown subject type %d",
rule->rr_subject_type);
}
rctl_racct_add_rule(p->p_racct, rule);
}
return (0);
}
static void
rctl_rule_pre_callback(void)
{
RACCT_LOCK();
}
static void
rctl_rule_post_callback(void)
{
RACCT_UNLOCK();
}
static void
rctl_rule_remove_callback(struct racct *racct, void *arg2, void *arg3)
{
struct rctl_rule *filter = (struct rctl_rule *)arg2;
int found = 0;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
found += rctl_racct_remove_rules(racct, filter);
*((int *)arg3) += found;
}
/*
* Remove all rules that match the filter.
*/
int
rctl_rule_remove(struct rctl_rule *filter)
{
struct proc *p;
int found = 0;
ASSERT_RACCT_ENABLED();
if (filter->rr_subject_type == RCTL_SUBJECT_TYPE_PROCESS &&
filter->rr_subject.rs_proc != NULL) {
p = filter->rr_subject.rs_proc;
RACCT_LOCK();
found = rctl_racct_remove_rules(p->p_racct, filter);
RACCT_UNLOCK();
if (found)
return (0);
return (ESRCH);
}
loginclass_racct_foreach(rctl_rule_remove_callback,
rctl_rule_pre_callback, rctl_rule_post_callback,
filter, (void *)&found);
ui_racct_foreach(rctl_rule_remove_callback,
rctl_rule_pre_callback, rctl_rule_post_callback,
filter, (void *)&found);
prison_racct_foreach(rctl_rule_remove_callback,
rctl_rule_pre_callback, rctl_rule_post_callback,
filter, (void *)&found);
sx_assert(&allproc_lock, SA_LOCKED);
RACCT_LOCK();
FOREACH_PROC_IN_SYSTEM(p) {
found += rctl_racct_remove_rules(p->p_racct, filter);
}
RACCT_UNLOCK();
if (found)
return (0);
return (ESRCH);
}
/*
* Appends a rule to the sbuf.
*/
static void
rctl_rule_to_sbuf(struct sbuf *sb, const struct rctl_rule *rule)
{
int64_t amount;
ASSERT_RACCT_ENABLED();
sbuf_printf(sb, "%s:", rctl_subject_type_name(rule->rr_subject_type));
switch (rule->rr_subject_type) {
case RCTL_SUBJECT_TYPE_PROCESS:
if (rule->rr_subject.rs_proc == NULL)
sbuf_printf(sb, ":");
else
sbuf_printf(sb, "%d:",
rule->rr_subject.rs_proc->p_pid);
break;
case RCTL_SUBJECT_TYPE_USER:
if (rule->rr_subject.rs_uip == NULL)
sbuf_printf(sb, ":");
else
sbuf_printf(sb, "%d:",
rule->rr_subject.rs_uip->ui_uid);
break;
case RCTL_SUBJECT_TYPE_LOGINCLASS:
if (rule->rr_subject.rs_loginclass == NULL)
sbuf_printf(sb, ":");
else
sbuf_printf(sb, "%s:",
rule->rr_subject.rs_loginclass->lc_name);
break;
case RCTL_SUBJECT_TYPE_JAIL:
if (rule->rr_subject.rs_prison_racct == NULL)
sbuf_printf(sb, ":");
else
sbuf_printf(sb, "%s:",
rule->rr_subject.rs_prison_racct->prr_name);
break;
default:
panic("rctl_rule_to_sbuf: unknown subject type %d",
rule->rr_subject_type);
}
amount = rule->rr_amount;
if (amount != RCTL_AMOUNT_UNDEFINED &&
RACCT_IS_IN_MILLIONS(rule->rr_resource))
amount /= 1000000;
sbuf_printf(sb, "%s:%s=%jd",
rctl_resource_name(rule->rr_resource),
rctl_action_name(rule->rr_action),
amount);
if (rule->rr_per != rule->rr_subject_type)
sbuf_printf(sb, "/%s", rctl_subject_type_name(rule->rr_per));
}
/*
* Routine used by RCTL syscalls to read in input string.
*/
static int
rctl_read_inbuf(char **inputstr, const char *inbufp, size_t inbuflen)
{
char *str;
int error;
ASSERT_RACCT_ENABLED();
if (inbuflen <= 0)
return (EINVAL);
if (inbuflen > RCTL_MAX_INBUFSIZE)
return (E2BIG);
str = malloc(inbuflen + 1, M_RCTL, M_WAITOK);
error = copyinstr(inbufp, str, inbuflen, NULL);
if (error != 0) {
free(str, M_RCTL);
return (error);
}
*inputstr = str;
return (0);
}
/*
* Routine used by RCTL syscalls to write out output string.
*/
static int
rctl_write_outbuf(struct sbuf *outputsbuf, char *outbufp, size_t outbuflen)
{
int error;
ASSERT_RACCT_ENABLED();
if (outputsbuf == NULL)
return (0);
sbuf_finish(outputsbuf);
if (outbuflen < sbuf_len(outputsbuf) + 1) {
sbuf_delete(outputsbuf);
return (ERANGE);
}
error = copyout(sbuf_data(outputsbuf), outbufp,
sbuf_len(outputsbuf) + 1);
sbuf_delete(outputsbuf);
return (error);
}
static struct sbuf *
rctl_racct_to_sbuf(struct racct *racct, int sloppy)
{
struct sbuf *sb;
int64_t amount;
int i;
ASSERT_RACCT_ENABLED();
sb = sbuf_new_auto();
for (i = 0; i <= RACCT_MAX; i++) {
if (sloppy == 0 && RACCT_IS_SLOPPY(i))
continue;
RACCT_LOCK();
amount = racct->r_resources[i];
RACCT_UNLOCK();
if (RACCT_IS_IN_MILLIONS(i))
amount /= 1000000;
sbuf_printf(sb, "%s=%jd,", rctl_resource_name(i), amount);
}
sbuf_setpos(sb, sbuf_len(sb) - 1);
return (sb);
}
int
sys_rctl_get_racct(struct thread *td, struct rctl_get_racct_args *uap)
{
struct rctl_rule *filter;
struct sbuf *outputsbuf = NULL;
struct proc *p;
struct uidinfo *uip;
struct loginclass *lc;
struct prison_racct *prr;
char *inputstr;
int error;
if (!racct_enable)
return (ENOSYS);
error = priv_check(td, PRIV_RCTL_GET_RACCT);
if (error != 0)
return (error);
error = rctl_read_inbuf(&inputstr, uap->inbufp, uap->inbuflen);
if (error != 0)
return (error);
sx_slock(&allproc_lock);
error = rctl_string_to_rule(inputstr, &filter);
free(inputstr, M_RCTL);
if (error != 0) {
sx_sunlock(&allproc_lock);
return (error);
}
switch (filter->rr_subject_type) {
case RCTL_SUBJECT_TYPE_PROCESS:
p = filter->rr_subject.rs_proc;
if (p == NULL) {
error = EINVAL;
goto out;
}
outputsbuf = rctl_racct_to_sbuf(p->p_racct, 0);
break;
case RCTL_SUBJECT_TYPE_USER:
uip = filter->rr_subject.rs_uip;
if (uip == NULL) {
error = EINVAL;
goto out;
}
outputsbuf = rctl_racct_to_sbuf(uip->ui_racct, 1);
break;
case RCTL_SUBJECT_TYPE_LOGINCLASS:
lc = filter->rr_subject.rs_loginclass;
if (lc == NULL) {
error = EINVAL;
goto out;
}
outputsbuf = rctl_racct_to_sbuf(lc->lc_racct, 1);
break;
case RCTL_SUBJECT_TYPE_JAIL:
prr = filter->rr_subject.rs_prison_racct;
if (prr == NULL) {
error = EINVAL;
goto out;
}
outputsbuf = rctl_racct_to_sbuf(prr->prr_racct, 1);
break;
default:
error = EINVAL;
}
out:
rctl_rule_release(filter);
sx_sunlock(&allproc_lock);
if (error != 0)
return (error);
error = rctl_write_outbuf(outputsbuf, uap->outbufp, uap->outbuflen);
return (error);
}
static void
rctl_get_rules_callback(struct racct *racct, void *arg2, void *arg3)
{
struct rctl_rule *filter = (struct rctl_rule *)arg2;
struct rctl_rule_link *link;
struct sbuf *sb = (struct sbuf *)arg3;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
LIST_FOREACH(link, &racct->r_rule_links, rrl_next) {
if (!rctl_rule_matches(link->rrl_rule, filter))
continue;
rctl_rule_to_sbuf(sb, link->rrl_rule);
sbuf_printf(sb, ",");
}
}
int
sys_rctl_get_rules(struct thread *td, struct rctl_get_rules_args *uap)
{
struct sbuf *sb;
struct rctl_rule *filter;
struct rctl_rule_link *link;
struct proc *p;
char *inputstr, *buf;
size_t bufsize;
int error;
if (!racct_enable)
return (ENOSYS);
error = priv_check(td, PRIV_RCTL_GET_RULES);
if (error != 0)
return (error);
error = rctl_read_inbuf(&inputstr, uap->inbufp, uap->inbuflen);
if (error != 0)
return (error);
sx_slock(&allproc_lock);
error = rctl_string_to_rule(inputstr, &filter);
free(inputstr, M_RCTL);
if (error != 0) {
sx_sunlock(&allproc_lock);
return (error);
}
bufsize = uap->outbuflen;
if (bufsize > rctl_maxbufsize) {
sx_sunlock(&allproc_lock);
return (E2BIG);
}
buf = malloc(bufsize, M_RCTL, M_WAITOK);
sb = sbuf_new(NULL, buf, bufsize, SBUF_FIXEDLEN);
KASSERT(sb != NULL, ("sbuf_new failed"));
FOREACH_PROC_IN_SYSTEM(p) {
RACCT_LOCK();
LIST_FOREACH(link, &p->p_racct->r_rule_links, rrl_next) {
/*
* Non-process rules will be added to the buffer later.
* Adding them here would result in duplicated output.
*/
if (link->rrl_rule->rr_subject_type !=
RCTL_SUBJECT_TYPE_PROCESS)
continue;
if (!rctl_rule_matches(link->rrl_rule, filter))
continue;
rctl_rule_to_sbuf(sb, link->rrl_rule);
sbuf_printf(sb, ",");
}
RACCT_UNLOCK();
}
loginclass_racct_foreach(rctl_get_rules_callback,
rctl_rule_pre_callback, rctl_rule_post_callback,
filter, sb);
ui_racct_foreach(rctl_get_rules_callback,
rctl_rule_pre_callback, rctl_rule_post_callback,
filter, sb);
prison_racct_foreach(rctl_get_rules_callback,
rctl_rule_pre_callback, rctl_rule_post_callback,
filter, sb);
if (sbuf_error(sb) == ENOMEM) {
error = ERANGE;
goto out;
}
/*
* Remove trailing ",".
*/
if (sbuf_len(sb) > 0)
sbuf_setpos(sb, sbuf_len(sb) - 1);
error = rctl_write_outbuf(sb, uap->outbufp, uap->outbuflen);
out:
rctl_rule_release(filter);
sx_sunlock(&allproc_lock);
free(buf, M_RCTL);
return (error);
}
int
sys_rctl_get_limits(struct thread *td, struct rctl_get_limits_args *uap)
{
struct sbuf *sb;
struct rctl_rule *filter;
struct rctl_rule_link *link;
char *inputstr, *buf;
size_t bufsize;
int error;
if (!racct_enable)
return (ENOSYS);
error = priv_check(td, PRIV_RCTL_GET_LIMITS);
if (error != 0)
return (error);
error = rctl_read_inbuf(&inputstr, uap->inbufp, uap->inbuflen);
if (error != 0)
return (error);
sx_slock(&allproc_lock);
error = rctl_string_to_rule(inputstr, &filter);
free(inputstr, M_RCTL);
if (error != 0) {
sx_sunlock(&allproc_lock);
return (error);
}
if (filter->rr_subject_type == RCTL_SUBJECT_TYPE_UNDEFINED) {
rctl_rule_release(filter);
sx_sunlock(&allproc_lock);
return (EINVAL);
}
if (filter->rr_subject_type != RCTL_SUBJECT_TYPE_PROCESS) {
rctl_rule_release(filter);
sx_sunlock(&allproc_lock);
return (EOPNOTSUPP);
}
if (filter->rr_subject.rs_proc == NULL) {
rctl_rule_release(filter);
sx_sunlock(&allproc_lock);
return (EINVAL);
}
bufsize = uap->outbuflen;
if (bufsize > rctl_maxbufsize) {
rctl_rule_release(filter);
sx_sunlock(&allproc_lock);
return (E2BIG);
}
buf = malloc(bufsize, M_RCTL, M_WAITOK);
sb = sbuf_new(NULL, buf, bufsize, SBUF_FIXEDLEN);
KASSERT(sb != NULL, ("sbuf_new failed"));
RACCT_LOCK();
LIST_FOREACH(link, &filter->rr_subject.rs_proc->p_racct->r_rule_links,
rrl_next) {
rctl_rule_to_sbuf(sb, link->rrl_rule);
sbuf_printf(sb, ",");
}
RACCT_UNLOCK();
if (sbuf_error(sb) == ENOMEM) {
error = ERANGE;
sbuf_delete(sb);
goto out;
}
/*
* Remove trailing ",".
*/
if (sbuf_len(sb) > 0)
sbuf_setpos(sb, sbuf_len(sb) - 1);
error = rctl_write_outbuf(sb, uap->outbufp, uap->outbuflen);
out:
rctl_rule_release(filter);
sx_sunlock(&allproc_lock);
free(buf, M_RCTL);
return (error);
}
int
sys_rctl_add_rule(struct thread *td, struct rctl_add_rule_args *uap)
{
struct rctl_rule *rule;
char *inputstr;
int error;
if (!racct_enable)
return (ENOSYS);
error = priv_check(td, PRIV_RCTL_ADD_RULE);
if (error != 0)
return (error);
error = rctl_read_inbuf(&inputstr, uap->inbufp, uap->inbuflen);
if (error != 0)
return (error);
sx_slock(&allproc_lock);
error = rctl_string_to_rule(inputstr, &rule);
free(inputstr, M_RCTL);
if (error != 0) {
sx_sunlock(&allproc_lock);
return (error);
}
/*
* The 'per' part of a rule is optional.
*/
if (rule->rr_per == RCTL_SUBJECT_TYPE_UNDEFINED &&
rule->rr_subject_type != RCTL_SUBJECT_TYPE_UNDEFINED)
rule->rr_per = rule->rr_subject_type;
if (!rctl_rule_fully_specified(rule)) {
error = EINVAL;
goto out;
}
error = rctl_rule_add(rule);
out:
rctl_rule_release(rule);
sx_sunlock(&allproc_lock);
return (error);
}
int
sys_rctl_remove_rule(struct thread *td, struct rctl_remove_rule_args *uap)
{
struct rctl_rule *filter;
char *inputstr;
int error;
if (!racct_enable)
return (ENOSYS);
error = priv_check(td, PRIV_RCTL_REMOVE_RULE);
if (error != 0)
return (error);
error = rctl_read_inbuf(&inputstr, uap->inbufp, uap->inbuflen);
if (error != 0)
return (error);
sx_slock(&allproc_lock);
error = rctl_string_to_rule(inputstr, &filter);
free(inputstr, M_RCTL);
if (error != 0) {
sx_sunlock(&allproc_lock);
return (error);
}
error = rctl_rule_remove(filter);
rctl_rule_release(filter);
sx_sunlock(&allproc_lock);
return (error);
}
/*
* Update RCTL rule list after credential change.
*/
void
rctl_proc_ucred_changed(struct proc *p, struct ucred *newcred)
{
LIST_HEAD(, rctl_rule_link) newrules;
struct rctl_rule_link *link, *newlink;
struct uidinfo *newuip;
struct loginclass *newlc;
struct prison_racct *newprr;
int rulecnt, i;
if (!racct_enable)
return;
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
newuip = newcred->cr_ruidinfo;
newlc = newcred->cr_loginclass;
newprr = newcred->cr_prison->pr_prison_racct;
LIST_INIT(&newrules);
again:
/*
* First, count the rules that apply to the process with new
* credentials.
*/
rulecnt = 0;
RACCT_LOCK();
LIST_FOREACH(link, &p->p_racct->r_rule_links, rrl_next) {
if (link->rrl_rule->rr_subject_type ==
RCTL_SUBJECT_TYPE_PROCESS)
rulecnt++;
}
LIST_FOREACH(link, &newuip->ui_racct->r_rule_links, rrl_next)
rulecnt++;
LIST_FOREACH(link, &newlc->lc_racct->r_rule_links, rrl_next)
rulecnt++;
LIST_FOREACH(link, &newprr->prr_racct->r_rule_links, rrl_next)
rulecnt++;
RACCT_UNLOCK();
/*
* Create temporary list. We've dropped the rctl_lock in order
* to use M_WAITOK.
*/
for (i = 0; i < rulecnt; i++) {
newlink = uma_zalloc(rctl_rule_link_zone, M_WAITOK);
newlink->rrl_rule = NULL;
newlink->rrl_exceeded = 0;
LIST_INSERT_HEAD(&newrules, newlink, rrl_next);
}
newlink = LIST_FIRST(&newrules);
/*
* Assign rules to the newly allocated list entries.
*/
RACCT_LOCK();
LIST_FOREACH(link, &p->p_racct->r_rule_links, rrl_next) {
if (link->rrl_rule->rr_subject_type ==
RCTL_SUBJECT_TYPE_PROCESS) {
if (newlink == NULL)
goto goaround;
rctl_rule_acquire(link->rrl_rule);
newlink->rrl_rule = link->rrl_rule;
newlink->rrl_exceeded = link->rrl_exceeded;
newlink = LIST_NEXT(newlink, rrl_next);
rulecnt--;
}
}
LIST_FOREACH(link, &newuip->ui_racct->r_rule_links, rrl_next) {
if (newlink == NULL)
goto goaround;
rctl_rule_acquire(link->rrl_rule);
newlink->rrl_rule = link->rrl_rule;
newlink->rrl_exceeded = link->rrl_exceeded;
newlink = LIST_NEXT(newlink, rrl_next);
rulecnt--;
}
LIST_FOREACH(link, &newlc->lc_racct->r_rule_links, rrl_next) {
if (newlink == NULL)
goto goaround;
rctl_rule_acquire(link->rrl_rule);
newlink->rrl_rule = link->rrl_rule;
newlink->rrl_exceeded = link->rrl_exceeded;
newlink = LIST_NEXT(newlink, rrl_next);
rulecnt--;
}
LIST_FOREACH(link, &newprr->prr_racct->r_rule_links, rrl_next) {
if (newlink == NULL)
goto goaround;
rctl_rule_acquire(link->rrl_rule);
newlink->rrl_rule = link->rrl_rule;
newlink->rrl_exceeded = link->rrl_exceeded;
newlink = LIST_NEXT(newlink, rrl_next);
rulecnt--;
}
if (rulecnt == 0) {
/*
* Free the old rule list.
*/
while (!LIST_EMPTY(&p->p_racct->r_rule_links)) {
link = LIST_FIRST(&p->p_racct->r_rule_links);
LIST_REMOVE(link, rrl_next);
rctl_rule_release(link->rrl_rule);
uma_zfree(rctl_rule_link_zone, link);
}
/*
* Replace lists and we're done.
*
* XXX: Is there any way to switch list heads instead
* of iterating here?
*/
while (!LIST_EMPTY(&newrules)) {
newlink = LIST_FIRST(&newrules);
LIST_REMOVE(newlink, rrl_next);
LIST_INSERT_HEAD(&p->p_racct->r_rule_links,
newlink, rrl_next);
}
RACCT_UNLOCK();
return;
}
goaround:
RACCT_UNLOCK();
/*
* Rule list changed while we were not holding the rctl_lock.
* Free the new list and try again.
*/
while (!LIST_EMPTY(&newrules)) {
newlink = LIST_FIRST(&newrules);
LIST_REMOVE(newlink, rrl_next);
if (newlink->rrl_rule != NULL)
rctl_rule_release(newlink->rrl_rule);
uma_zfree(rctl_rule_link_zone, newlink);
}
goto again;
}
/*
* Assign RCTL rules to the newly created process.
*/
int
rctl_proc_fork(struct proc *parent, struct proc *child)
{
struct rctl_rule *rule;
struct rctl_rule_link *link;
int error;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
KASSERT(parent->p_racct != NULL, ("process without racct; p = %p", parent));
LIST_INIT(&child->p_racct->r_rule_links);
/*
* Go through limits applicable to the parent and assign them
* to the child. Rules with 'process' subject have to be duplicated
* in order to make their rr_subject point to the new process.
*/
LIST_FOREACH(link, &parent->p_racct->r_rule_links, rrl_next) {
if (link->rrl_rule->rr_subject_type ==
RCTL_SUBJECT_TYPE_PROCESS) {
rule = rctl_rule_duplicate(link->rrl_rule, M_NOWAIT);
if (rule == NULL)
goto fail;
KASSERT(rule->rr_subject.rs_proc == parent,
("rule->rr_subject.rs_proc != parent"));
rule->rr_subject.rs_proc = child;
error = rctl_racct_add_rule_locked(child->p_racct,
rule);
rctl_rule_release(rule);
if (error != 0)
goto fail;
} else {
error = rctl_racct_add_rule_locked(child->p_racct,
link->rrl_rule);
if (error != 0)
goto fail;
}
}
return (0);
fail:
while (!LIST_EMPTY(&child->p_racct->r_rule_links)) {
link = LIST_FIRST(&child->p_racct->r_rule_links);
LIST_REMOVE(link, rrl_next);
rctl_rule_release(link->rrl_rule);
uma_zfree(rctl_rule_link_zone, link);
}
return (EAGAIN);
}
/*
* Release rules attached to the racct.
*/
void
rctl_racct_release(struct racct *racct)
{
struct rctl_rule_link *link;
ASSERT_RACCT_ENABLED();
RACCT_LOCK_ASSERT();
while (!LIST_EMPTY(&racct->r_rule_links)) {
link = LIST_FIRST(&racct->r_rule_links);
LIST_REMOVE(link, rrl_next);
rctl_rule_release(link->rrl_rule);
uma_zfree(rctl_rule_link_zone, link);
}
}
static void
rctl_init(void)
{
if (!racct_enable)
return;
rctl_rule_zone = uma_zcreate("rctl_rule", sizeof(struct rctl_rule),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
rctl_rule_link_zone = uma_zcreate("rctl_rule_link",
sizeof(struct rctl_rule_link), NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);
/*
* Set default values, making sure not to overwrite the ones
* fetched from tunables. Most of those could be set at the
* declaration, except for the rctl_throttle_max - we cannot
* set it there due to hz not being compile time constant.
*/
if (rctl_throttle_min < 1)
rctl_throttle_min = 1;
if (rctl_throttle_max < rctl_throttle_min)
rctl_throttle_max = 2 * hz;
if (rctl_throttle_pct < 0)
rctl_throttle_pct = 100;
if (rctl_throttle_pct2 < 0)
rctl_throttle_pct2 = 100;
}
#else /* !RCTL */
int
sys_rctl_get_racct(struct thread *td, struct rctl_get_racct_args *uap)
{
return (ENOSYS);
}
int
sys_rctl_get_rules(struct thread *td, struct rctl_get_rules_args *uap)
{
return (ENOSYS);
}
int
sys_rctl_get_limits(struct thread *td, struct rctl_get_limits_args *uap)
{
return (ENOSYS);
}
int
sys_rctl_add_rule(struct thread *td, struct rctl_add_rule_args *uap)
{
return (ENOSYS);
}
int
sys_rctl_remove_rule(struct thread *td, struct rctl_remove_rule_args *uap)
{
return (ENOSYS);
}
#endif /* !RCTL */
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