mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-14 22:32:30 +01:00
e8f77c204b
Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D24652
250 lines
6.7 KiB
C
250 lines
6.7 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright (c) 1988 University of Utah.
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* 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.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*
|
|
* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
|
|
*
|
|
* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
|
|
*/
|
|
|
|
/*
|
|
* Traditional sbrk/grow interface to VM
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/racct.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/syscallsubr.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/systm.h>
|
|
#if defined(__amd64__) || defined(__i386__) /* for i386_read_exec */
|
|
#include <machine/md_var.h>
|
|
#endif
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct break_args {
|
|
char *nsize;
|
|
};
|
|
#endif
|
|
int
|
|
sys_break(struct thread *td, struct break_args *uap)
|
|
{
|
|
#if !defined(__aarch64__) && !defined(__riscv)
|
|
uintptr_t addr;
|
|
int error;
|
|
|
|
addr = (uintptr_t)uap->nsize;
|
|
error = kern_break(td, &addr);
|
|
if (error == 0)
|
|
td->td_retval[0] = addr;
|
|
return (error);
|
|
#else /* defined(__aarch64__) || defined(__riscv) */
|
|
return (ENOSYS);
|
|
#endif /* defined(__aarch64__) || defined(__riscv) */
|
|
}
|
|
|
|
int
|
|
kern_break(struct thread *td, uintptr_t *addr)
|
|
{
|
|
struct vmspace *vm = td->td_proc->p_vmspace;
|
|
vm_map_t map = &vm->vm_map;
|
|
vm_offset_t new, old, base;
|
|
rlim_t datalim, lmemlim, vmemlim;
|
|
int prot, rv;
|
|
int error = 0;
|
|
|
|
datalim = lim_cur(td, RLIMIT_DATA);
|
|
lmemlim = lim_cur(td, RLIMIT_MEMLOCK);
|
|
vmemlim = lim_cur(td, RLIMIT_VMEM);
|
|
|
|
new = round_page(*addr);
|
|
vm_map_lock(map);
|
|
|
|
base = round_page((vm_offset_t) vm->vm_daddr);
|
|
old = base + ctob(vm->vm_dsize);
|
|
if (new > base) {
|
|
/*
|
|
* Check the resource limit, but allow a process to reduce
|
|
* its usage, even if it remains over the limit.
|
|
*/
|
|
if (new - base > datalim && new > old) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
if (new > vm_map_max(map)) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
} else if (new < base) {
|
|
/*
|
|
* Simply return the current break address without
|
|
* modifying any state. This is an ad-hoc interface
|
|
* used by libc to determine the initial break address,
|
|
* avoiding a dependency on magic features in the system
|
|
* linker.
|
|
*/
|
|
new = old;
|
|
goto done;
|
|
}
|
|
|
|
if (new > old) {
|
|
if (!old_mlock && map->flags & MAP_WIREFUTURE) {
|
|
if (ptoa(pmap_wired_count(map->pmap)) +
|
|
(new - old) > lmemlim) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
}
|
|
if (map->size + (new - old) > vmemlim) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(td->td_proc);
|
|
error = racct_set(td->td_proc, RACCT_DATA, new - base);
|
|
if (error != 0) {
|
|
PROC_UNLOCK(td->td_proc);
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
error = racct_set(td->td_proc, RACCT_VMEM,
|
|
map->size + (new - old));
|
|
if (error != 0) {
|
|
racct_set_force(td->td_proc, RACCT_DATA,
|
|
old - base);
|
|
PROC_UNLOCK(td->td_proc);
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
if (!old_mlock && map->flags & MAP_WIREFUTURE) {
|
|
error = racct_set(td->td_proc, RACCT_MEMLOCK,
|
|
ptoa(pmap_wired_count(map->pmap)) +
|
|
(new - old));
|
|
if (error != 0) {
|
|
racct_set_force(td->td_proc, RACCT_DATA,
|
|
old - base);
|
|
racct_set_force(td->td_proc, RACCT_VMEM,
|
|
map->size);
|
|
PROC_UNLOCK(td->td_proc);
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
prot = VM_PROT_RW;
|
|
#if (defined(COMPAT_FREEBSD32) && defined(__amd64__)) || defined(__i386__)
|
|
if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32))
|
|
prot |= VM_PROT_EXECUTE;
|
|
#endif
|
|
rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL,
|
|
0);
|
|
if (rv == KERN_SUCCESS && (map->flags & MAP_WIREFUTURE) != 0) {
|
|
rv = vm_map_wire_locked(map, old, new,
|
|
VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
|
|
if (rv != KERN_SUCCESS)
|
|
(void)vm_map_delete(map, old, new);
|
|
}
|
|
if (rv != KERN_SUCCESS) {
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(td->td_proc);
|
|
racct_set_force(td->td_proc,
|
|
RACCT_DATA, old - base);
|
|
racct_set_force(td->td_proc,
|
|
RACCT_VMEM, map->size);
|
|
if (!old_mlock && map->flags & MAP_WIREFUTURE) {
|
|
racct_set_force(td->td_proc,
|
|
RACCT_MEMLOCK,
|
|
ptoa(pmap_wired_count(map->pmap)));
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
vm->vm_dsize += btoc(new - old);
|
|
} else if (new < old) {
|
|
rv = vm_map_delete(map, new, old);
|
|
if (rv != KERN_SUCCESS) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
vm->vm_dsize -= btoc(old - new);
|
|
#ifdef RACCT
|
|
if (racct_enable) {
|
|
PROC_LOCK(td->td_proc);
|
|
racct_set_force(td->td_proc, RACCT_DATA, new - base);
|
|
racct_set_force(td->td_proc, RACCT_VMEM, map->size);
|
|
if (!old_mlock && map->flags & MAP_WIREFUTURE) {
|
|
racct_set_force(td->td_proc, RACCT_MEMLOCK,
|
|
ptoa(pmap_wired_count(map->pmap)));
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
}
|
|
done:
|
|
vm_map_unlock(map);
|
|
|
|
if (error == 0)
|
|
*addr = new;
|
|
|
|
return (error);
|
|
}
|
|
|
|
#ifdef COMPAT_FREEBSD11
|
|
int
|
|
freebsd11_vadvise(struct thread *td, struct freebsd11_vadvise_args *uap)
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|
|
#endif
|