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- /* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
- /* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
- /* Copyright (C) 2014 Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * shim_getrlimit.c
- *
- * Implementation of system call "getrlimit" and "setrlimit".
- */
- #include <shim_internal.h>
- #include <shim_checkpoint.h>
- #include <shim_table.h>
- #include <shim_utils.h>
- #include <shim_vma.h>
- #include <asm/resource.h>
- /*
- * TODO: implement actual limitation on each resource.
- *
- * The current behavor(i.e. sys_stack_size, brk_max_size) may be subject
- * to be fixed.
- */
- #define _STK_LIM (8*1024*1024)
- #define MAX_THREADS (0x3fffffff / 2)
- #define DEFAULT_MAX_FDS (1024)
- #define MAX_MAX_FDS (65536) /* 4096: Linux initial value */
- #define MLOCK_LIMIT (64*1024)
- #define MQ_BYTES_MAX 819200
- struct __kernel_rlimit __rlim[RLIM_NLIMITS] __attribute_migratable = {
- [RLIMIT_CPU] = { RLIM_INFINITY, RLIM_INFINITY },
- [RLIMIT_FSIZE] = { RLIM_INFINITY, RLIM_INFINITY },
- /* For now __rlim[RLIMIT_DATA] isn't used. See the implementation */
- [RLIMIT_DATA] = { RLIM_INFINITY, RLIM_INFINITY },
- /* For now __rlim[RLIMIT_STACK] isn't used. See the implementation */
- [RLIMIT_STACK] = { _STK_LIM, RLIM_INFINITY },
- [RLIMIT_CORE] = { 0, RLIM_INFINITY },
- [RLIMIT_RSS] = { RLIM_INFINITY, RLIM_INFINITY },
- [RLIMIT_NPROC] = { MAX_THREADS, MAX_THREADS },
- [RLIMIT_NOFILE] = { DEFAULT_MAX_FDS, MAX_MAX_FDS },
- [RLIMIT_MEMLOCK] = { MLOCK_LIMIT, MLOCK_LIMIT },
- [RLIMIT_AS] = { RLIM_INFINITY, RLIM_INFINITY },
- [RLIMIT_LOCKS] = { RLIM_INFINITY, RLIM_INFINITY },
- /* [RLIMIT_SIGPENDING] = [RLIMIT_NPROC] for initial value */
- [RLIMIT_SIGPENDING] = { MAX_THREADS, MAX_THREADS },
- [RLIMIT_MSGQUEUE] = { MQ_BYTES_MAX, MQ_BYTES_MAX },
- [RLIMIT_NICE] = { 0, 0 },
- [RLIMIT_RTPRIO] = { 0, 0 },
- [RLIMIT_RTTIME] = { RLIM_INFINITY, RLIM_INFINITY },
- };
- int shim_do_getrlimit (int resource, struct __kernel_rlimit * rlim)
- {
- if (resource < 0 || RLIM_NLIMITS <= resource)
- return -EINVAL;
- switch (resource) {
- case RLIMIT_STACK:
- rlim->rlim_cur = sys_stack_size;
- rlim->rlim_max = sys_stack_size;
- return 0;
- case RLIMIT_DATA:
- rlim->rlim_cur = brk_max_size;
- rlim->rlim_max = __rlim[resource].rlim_max;
- return 0;
- default:
- *rlim = __rlim[resource];
- return 0;
- }
- }
- int shim_do_setrlimit (int resource, struct __kernel_rlimit * rlim)
- {
- if (resource < 0 || RLIM_NLIMITS <= resource)
- return -EINVAL;
- if (!rlim || test_user_memory(rlim, sizeof(*rlim), false))
- return -EFAULT;
- if (rlim->rlim_cur > rlim->rlim_max)
- return -EINVAL;
- if (rlim->rlim_cur > __rlim->rlim_max)
- return -EINVAL;
- switch (resource) {
- case RLIMIT_STACK:
- sys_stack_size = rlim->rlim_cur;
- return 0;
- default:
- __rlim[resource].rlim_cur = rlim->rlim_cur;
- return 0;
- }
- }
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