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https://github.com/freebsd/freebsd-src.git
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Bojan Novković
1092ec8b33
This change introduces a new per-UID limit for controlling the number of vmm instances, in anticipation of unprivileged bhyve. This allows ut to limit the amount of kernel memory allocated by the vmm driver and prevent potential memory exhaustion attacks. Differential Revision: https://reviews.freebsd.org/D53728 Reviewed by: markj, olce, corvink MFC after: 3 months Sponsored by: The FreeBSD Foundation Sponsored by: Klara, Inc.
129 lines
4.0 KiB
C
129 lines
4.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2011 Mikolaj Golub
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* Copyright (c) 2015 Allan Jude <[email protected]>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <err.h>
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#include <errno.h>
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#include <libprocstat.h>
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#include <libutil.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "procstat.h"
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static struct {
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const char *name;
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const char *suffix;
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} rlimit_param[] = {
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{"cputime", "sec"},
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{"filesize", "B "},
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{"datasize", "B "},
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{"stacksize", "B "},
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{"coredumpsize", "B "},
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{"memoryuse", "B "},
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{"memorylocked", "B "},
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{"maxprocesses", " "},
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{"openfiles", " "},
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{"sbsize", "B "},
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{"vmemoryuse", "B "},
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{"pseudo-terminals", " "},
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{"swapuse", "B "},
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{"kqueues", " "},
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{"umtxp", " "},
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{"pipebuf", "B "},
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{"virtual-machines", " "},
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};
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_Static_assert(nitems(rlimit_param) == RLIM_NLIMITS,
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"Resource limits have grown. Add new entries to rlimit_param[].");
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static const char *
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humanize_rlimit(int indx, rlim_t limit)
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{
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static char buf[14];
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int scale;
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if (limit == RLIM_INFINITY)
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return ("infinity ");
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scale = humanize_number(buf, sizeof(buf) - 1, (int64_t)limit,
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rlimit_param[indx].suffix, HN_AUTOSCALE | HN_GETSCALE, HN_DECIMAL);
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(void)humanize_number(buf, sizeof(buf) - 1, (int64_t)limit,
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rlimit_param[indx].suffix, HN_AUTOSCALE, HN_DECIMAL);
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/* Pad with one space if there is no suffix prefix. */
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if (scale == 0)
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sprintf(buf + strlen(buf), " ");
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return (buf);
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}
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void
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procstat_rlimit(struct procstat *prstat, struct kinfo_proc *kipp)
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{
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struct rlimit rlimit;
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int i;
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if ((procstat_opts & PS_OPT_NOHEADER) == 0) {
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xo_emit("{T:/%5s %-16s %-16s %16s %16s}\n",
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"PID", "COMM", "RLIMIT", "SOFT ", "HARD ");
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}
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xo_emit("{ek:process_id/%5d}{e:command/%-16s/%s}", kipp->ki_pid,
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kipp->ki_comm);
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for (i = 0; i < RLIM_NLIMITS; i++) {
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if (procstat_getrlimit(prstat, kipp, i, &rlimit) == -1)
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return;
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xo_emit("{dk:process_id/%5d} {d:command/%-16s} "
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"{d:rlimit_param/%-16s} ", kipp->ki_pid, kipp->ki_comm,
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rlimit_param[i].name);
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xo_open_container(rlimit_param[i].name);
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if (rlimit.rlim_cur == RLIM_INFINITY)
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xo_emit("{e:soft_limit/infinity}");
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else
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xo_emit("{e:soft_limit/%U}", rlimit.rlim_cur);
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if (rlimit.rlim_max == RLIM_INFINITY)
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xo_emit("{e:hard_limit/infinity}");
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else
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xo_emit("{e:hard_limit/%U}", rlimit.rlim_max);
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xo_close_container(rlimit_param[i].name);
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xo_emit("{d:rlim_cur/%16s} ",
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humanize_rlimit(i, rlimit.rlim_cur));
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xo_emit("{d:rlim_max/%16s}\n",
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humanize_rlimit(i, rlimit.rlim_max));
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}
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}
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