common/os/rctl_proc.c

	rctl_proc.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <sys/cmn_err.h>
#include <sys/sysmacros.h>
#include <sys/proc.h>
#include <sys/rctl.h>
#include <sys/rctl_impl.h>
#include <sys/port_kernel.h>

#include <sys/vmparam.h>
#include <sys/machparam.h>

/*
 * Process-based resource controls
 *   The structure of the kernel leaves us no particular place where the process
 *   abstraction can be declared--it is intertwined with the growth of the Unix
 *   kernel.  Accordingly, we place all of the resource control logic associated
 *   with processes, both existing and future, in this file.
 */

rctl_hndl_t rctlproc_legacy[RLIM_NLIMITS];
uint_t rctlproc_flags[RLIM_NLIMITS] = {
    RCTL_LOCAL_SIGNAL,          /* RLIMIT_CPU   */
    RCTL_LOCAL_DENY | RCTL_LOCAL_SIGNAL,    /* RLIMIT_FSIZE */
    RCTL_LOCAL_DENY,                /* RLIMIT_DATA  */
    RCTL_LOCAL_DENY,                /* RLIMIT_STACK */
    RCTL_LOCAL_DENY,                /* RLIMIT_CORE  */
    RCTL_LOCAL_DENY,                /* RLIMIT_NOFILE */
    RCTL_LOCAL_DENY             /* RLIMIT_VMEM  */
};
int rctlproc_signals[RLIM_NLIMITS] = {
    SIGXCPU,                /* RLIMIT_CPU   */
    SIGXFSZ,                /* RLIMIT_FSIZE */
    0, 0, 0, 0, 0               /* remainder do not signal */
};

rctl_hndl_t rc_process_msgmnb;
rctl_hndl_t rc_process_msgtql;
rctl_hndl_t rc_process_semmsl;
rctl_hndl_t rc_process_semopm;
rctl_hndl_t rc_process_portev;

/*
 * process.max-cpu-time / RLIMIT_CPU
 */
/*ARGSUSED*/
static int
proc_cpu_time_test(struct rctl *rctl, struct proc *p, rctl_entity_p_t *e,
    rctl_val_t *rval, rctl_qty_t inc, uint_t flags)
{
    return (inc >= rval->rcv_value);
}

static rctl_ops_t proc_cpu_time_ops = {
    rcop_no_action,
    rcop_no_usage,
    rcop_no_set,
    proc_cpu_time_test
};

/*
 * process.max-file-size / RLIMIT_FSIZE
 */
static int
proc_filesize_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e,
    rctl_qty_t nv)
{
    if (p->p_model == DATAMODEL_NATIVE)
        nv = MIN(nv, rctl->rc_dict_entry->rcd_max_native);
    else
        nv = MIN(nv, rctl->rc_dict_entry->rcd_max_ilp32);

    ASSERT(e->rcep_t == RCENTITY_PROCESS);
    e->rcep_p.proc->p_fsz_ctl = nv;

    return (0);
}

static rctl_ops_t proc_filesize_ops = {
    rcop_no_action,
    rcop_no_usage,
    proc_filesize_set,
    rcop_no_test
};

/*
 * process.max-data / RLIMIT_DATA
 */

/*
 * process.max-stack-size / RLIMIT_STACK
 */
static int
proc_stack_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e,
    rctl_qty_t nv)
{
    klwp_t *lwp = ttolwp(curthread);

    if (p->p_model == DATAMODEL_NATIVE)
        nv = MIN(nv, rctl->rc_dict_entry->rcd_max_native);
    else
        nv = MIN(nv, rctl->rc_dict_entry->rcd_max_ilp32);

    /*
     * In the process of changing the rlimit, this function actually
     * gets called a number of times. We only want to save the current
     * rlimit the first time we come through here. In post_syscall(),
     * we copyin() the lwp's ustack, and compare it to the rlimit we
     * save here; if the two match, we adjust the ustack to reflect
     * the new stack bounds.
     *
     * We check to make sure that we're changing the rlimit of our
     * own process rather than on behalf of some other process. The
     * notion of changing this resource limit on behalf of another
     * process is problematic at best, and changing the amount of stack
     * space a process is allowed to consume is a rather antiquated
     * notion that has limited applicability in our multithreaded
     * process model.
     */
    ASSERT(e->rcep_t == RCENTITY_PROCESS);
    if (lwp != NULL && lwp->lwp_procp == e->rcep_p.proc &&
        lwp->lwp_ustack && lwp->lwp_old_stk_ctl == 0) {
        lwp->lwp_old_stk_ctl = (size_t)e->rcep_p.proc->p_stk_ctl;
        curthread->t_post_sys = 1;
    }

    e->rcep_p.proc->p_stk_ctl = nv;

    return (0);
}

static rctl_ops_t proc_stack_ops = {
    rcop_no_action,
    rcop_no_usage,
    proc_stack_set,
    rcop_no_test
};

/*
 * process.max-file-descriptors / RLIMIT_NOFILE
 */
static int
proc_nofile_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e, rctl_qty_t nv)
{
    ASSERT(e->rcep_t == RCENTITY_PROCESS);
    if (p->p_model == DATAMODEL_NATIVE)
        nv = MIN(nv, rctl->rc_dict_entry->rcd_max_native);
    else
        nv = MIN(nv, rctl->rc_dict_entry->rcd_max_ilp32);

    e->rcep_p.proc->p_fno_ctl = nv;

    return (0);
}

static rctl_ops_t proc_nofile_ops = {
    rcop_no_action,
    rcop_no_usage,
    proc_nofile_set,
    rcop_absolute_test
};

/*
 * process.max-address-space / RLIMIT_VMEM
 */
static int
proc_vmem_set(rctl_t *rctl, struct proc *p, rctl_entity_p_t *e, rctl_qty_t nv)
{
    ASSERT(e->rcep_t == RCENTITY_PROCESS);
    if (p->p_model == DATAMODEL_ILP32)
        nv = MIN(nv, rctl->rc_dict_entry->rcd_max_ilp32);
    else
        nv = MIN(nv, rctl->rc_dict_entry->rcd_max_native);

    e->rcep_p.proc->p_vmem_ctl = nv;

    return (0);
}

static rctl_ops_t proc_vmem_ops = {
    rcop_no_action,
    rcop_no_usage,
    proc_vmem_set,
    rcop_no_test
};

/*
 * void rctlproc_default_init()
 *
 * Overview
 *   Establish default basic and privileged control values on the init process.
 *   These correspond to the soft and hard limits, respectively.
 */
void
rctlproc_default_init(struct proc *initp, rctl_alloc_gp_t *gp)
{
    struct rlimit64 rlp64;

    /*
     * RLIMIT_CPU: deny never, sigtoproc(pp, NULL, SIGXCPU).
     */
    rlp64.rlim_cur = rlp64.rlim_max = RLIM64_INFINITY;
    (void) rctl_rlimit_set(rctlproc_legacy[RLIMIT_CPU], initp, &rlp64, gp,
        RCTL_LOCAL_SIGNAL, SIGXCPU, kcred);

    /*
     * RLIMIT_FSIZE: deny always, sigtoproc(pp, NULL, SIGXFSZ).
     */
    rlp64.rlim_cur = rlp64.rlim_max = RLIM64_INFINITY;
    (void) rctl_rlimit_set(rctlproc_legacy[RLIMIT_FSIZE], initp, &rlp64, gp,
        RCTL_LOCAL_SIGNAL | RCTL_LOCAL_DENY, SIGXFSZ, kcred);

    /*
     * RLIMIT_DATA: deny always, no default action.
     */
    rlp64.rlim_cur = rlp64.rlim_max = RLIM64_INFINITY;
    (void) rctl_rlimit_set(rctlproc_legacy[RLIMIT_DATA], initp, &rlp64, gp,
        RCTL_LOCAL_DENY, 0, kcred);

    /*
     * RLIMIT_STACK: deny always, no default action.
     */
#ifdef __sparc
    rlp64.rlim_cur = DFLSSIZ;
    rlp64.rlim_max = LONG_MAX;
#else
    rlp64.rlim_cur = DFLSSIZ;
    rlp64.rlim_max = MAXSSIZ;
#endif
    (void) rctl_rlimit_set(rctlproc_legacy[RLIMIT_STACK], initp, &rlp64, gp,
        RCTL_LOCAL_DENY, 0, kcred);

    /*
     * RLIMIT_CORE: deny always, no default action.
     */
    rlp64.rlim_cur = rlp64.rlim_max = RLIM64_INFINITY;
    (void) rctl_rlimit_set(rctlproc_legacy[RLIMIT_CORE], initp, &rlp64, gp,
        RCTL_LOCAL_DENY, 0, kcred);

    /*
     * RLIMIT_NOFILE: deny always, no action.
     */
    rlp64.rlim_cur = rlim_fd_cur;
    rlp64.rlim_max = rlim_fd_max;
    (void) rctl_rlimit_set(rctlproc_legacy[RLIMIT_NOFILE], initp, &rlp64,
        gp, RCTL_LOCAL_DENY, 0, kcred);

    /*
     * RLIMIT_VMEM
     */
    rlp64.rlim_cur = rlp64.rlim_max = RLIM64_INFINITY;
    (void) rctl_rlimit_set(rctlproc_legacy[RLIMIT_VMEM], initp, &rlp64, gp,
        RCTL_LOCAL_DENY, 0, kcred);
}

/*
 * void rctlproc_init()
 *
 * Overview
 *   Register the various resource controls associated with process entities.
 *   The historical rlim_infinity_map and rlim_infinity32_map are now encoded
 *   here as the native and ILP32 infinite values for each resource control.
 */
void
rctlproc_init()
{
    rctl_set_t *set;
    rctl_alloc_gp_t *gp;
    rctl_entity_p_t e;

    rctlproc_legacy[RLIMIT_CPU] = rctl_register("process.max-cpu-time",
        RCENTITY_PROCESS, RCTL_GLOBAL_LOWERABLE | RCTL_GLOBAL_DENY_NEVER |
        RCTL_GLOBAL_CPU_TIME | RCTL_GLOBAL_INFINITE | RCTL_GLOBAL_SECONDS,
        UINT64_MAX, UINT64_MAX, &proc_cpu_time_ops);
    rctlproc_legacy[RLIMIT_FSIZE] = rctl_register("process.max-file-size",
        RCENTITY_PROCESS, RCTL_GLOBAL_LOWERABLE | RCTL_GLOBAL_DENY_ALWAYS |
        RCTL_GLOBAL_FILE_SIZE | RCTL_GLOBAL_BYTES,
        MAXOFFSET_T, MAXOFFSET_T, &proc_filesize_ops);
    rctlproc_legacy[RLIMIT_DATA] = rctl_register("process.max-data-size",
        RCENTITY_PROCESS, RCTL_GLOBAL_LOWERABLE | RCTL_GLOBAL_DENY_ALWAYS |
        RCTL_GLOBAL_SIGNAL_NEVER | RCTL_GLOBAL_BYTES,
        ULONG_MAX, UINT32_MAX, &rctl_default_ops);
#ifdef _LP64
#ifdef __sparc
    rctlproc_legacy[RLIMIT_STACK] = rctl_register("process.max-stack-size",
        RCENTITY_PROCESS, RCTL_GLOBAL_LOWERABLE | RCTL_GLOBAL_DENY_ALWAYS |
        RCTL_GLOBAL_SIGNAL_NEVER | RCTL_GLOBAL_BYTES,
        LONG_MAX, INT32_MAX, &proc_stack_ops);
#else   /* __sparc */
    rctlproc_legacy[RLIMIT_STACK] = rctl_register("process.max-stack-size",
        RCENTITY_PROCESS, RCTL_GLOBAL_LOWERABLE | RCTL_GLOBAL_DENY_ALWAYS |
        RCTL_GLOBAL_SIGNAL_NEVER | RCTL_GLOBAL_BYTES,
        MAXSSIZ, INT32_MAX, &proc_stack_ops);
#endif  /* __sparc */
#else   /* _LP64 */
    rctlproc_legacy[RLIMIT_STACK] = rctl_register("process.max-stack-size",
        RCENTITY_PROCESS, RCTL_GLOBAL_LOWERABLE | RCTL_GLOBAL_DENY_ALWAYS |
        RCTL_GLOBAL_SIGNAL_NEVER | RCTL_GLOBAL_BYTES,
        INT32_MAX, INT32_MAX, &proc_stack_ops);
#endif
    rctlproc_legacy[RLIMIT_CORE] = rctl_register("process.max-core-size",
        RCENTITY_PROCESS, RCTL_GLOBAL_LOWERABLE | RCTL_GLOBAL_DENY_ALWAYS |
        RCTL_GLOBAL_SIGNAL_NEVER | RCTL_GLOBAL_BYTES,
        MIN(MAXOFFSET_T, ULONG_MAX), UINT32_MAX, &rctl_default_ops);
    rctlproc_legacy[RLIMIT_NOFILE] = rctl_register(
        "process.max-file-descriptor", RCENTITY_PROCESS,
        RCTL_GLOBAL_LOWERABLE | RCTL_GLOBAL_DENY_ALWAYS |
        RCTL_GLOBAL_COUNT, INT32_MAX, INT32_MAX, &proc_nofile_ops);
    rctlproc_legacy[RLIMIT_VMEM] =
        rctl_register("process.max-address-space", RCENTITY_PROCESS,
        RCTL_GLOBAL_LOWERABLE | RCTL_GLOBAL_DENY_ALWAYS |
        RCTL_GLOBAL_SIGNAL_NEVER | RCTL_GLOBAL_BYTES,
        ULONG_MAX, UINT32_MAX, &proc_vmem_ops);

    rc_process_semmsl = rctl_register("process.max-sem-nsems",
        RCENTITY_PROCESS, RCTL_GLOBAL_DENY_ALWAYS | RCTL_GLOBAL_COUNT,
        SHRT_MAX, SHRT_MAX, &rctl_absolute_ops);
    rctl_add_legacy_limit("process.max-sem-nsems", "semsys",
        "seminfo_semmsl", 512, SHRT_MAX);

    rc_process_semopm = rctl_register("process.max-sem-ops",
        RCENTITY_PROCESS, RCTL_GLOBAL_DENY_ALWAYS | RCTL_GLOBAL_COUNT,
        INT_MAX, INT_MAX, &rctl_absolute_ops);
    rctl_add_legacy_limit("process.max-sem-ops", "semsys",
        "seminfo_semopm", 512, INT_MAX);

    rc_process_msgmnb = rctl_register("process.max-msg-qbytes",
        RCENTITY_PROCESS, RCTL_GLOBAL_DENY_ALWAYS | RCTL_GLOBAL_BYTES,
        ULONG_MAX, ULONG_MAX, &rctl_absolute_ops);
    rctl_add_legacy_limit("process.max-msg-qbytes", "msgsys",
        "msginfo_msgmnb", 65536, ULONG_MAX);

    rc_process_msgtql = rctl_register("process.max-msg-messages",
        RCENTITY_PROCESS, RCTL_GLOBAL_DENY_ALWAYS | RCTL_GLOBAL_COUNT,
        UINT_MAX, UINT_MAX, &rctl_absolute_ops);
    rctl_add_legacy_limit("process.max-msg-messages", "msgsys",
        "msginfo_msgtql", 8192, UINT_MAX);

    rc_process_portev = rctl_register("process.max-port-events",
        RCENTITY_PROCESS, RCTL_GLOBAL_DENY_ALWAYS | RCTL_GLOBAL_COUNT,
        PORT_MAX_EVENTS, PORT_MAX_EVENTS, &rctl_absolute_ops);
    rctl_add_default_limit("process.max-port-events", PORT_DEFAULT_EVENTS,
        RCPRIV_PRIVILEGED, RCTL_LOCAL_DENY);

    /*
     * Place minimal set of controls on "sched" process for inheritance by
     * processes created via newproc().
     */
    set = rctl_set_create();
    gp = rctl_set_init_prealloc(RCENTITY_PROCESS);
    mutex_enter(&curproc->p_lock);
    e.rcep_p.proc = curproc;
    e.rcep_t = RCENTITY_PROCESS;
    curproc->p_rctls = rctl_set_init(RCENTITY_PROCESS, curproc, &e,
        set, gp);
    mutex_exit(&curproc->p_lock);
    rctl_prealloc_destroy(gp);
}