freebsd-nq/sys/amd64/linux/linux_machdep.c
Dmitry Chagin 97d06da692 Fix a copy/paste bug introduced during X86_64 Linuxulator work.
FreeBSD support NX bit on X86_64 processors out of the box, for i386 emulation
use READ_IMPLIES_EXEC flag, introduced in r302515.

While here move common part of mmap() and mprotect() code to the files in compat/linux
to reduce code dupcliation between Linuxulator's.

Reported by:    Johannes Jost Meixner, Shawn Webb

MFC after:	1 week
XMFC with:	r302515, r302516
2016-07-10 08:22:04 +00:00

272 lines
6.6 KiB
C

/*-
* Copyright (c) 2013 Dmitry Chagin
* Copyright (c) 2004 Tim J. Robbins
* Copyright (c) 2002 Doug Rabson
* Copyright (c) 2000 Marcel Moolenaar
* All rights reserved.
*
* 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
* in this position and unchanged.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/capability.h>
#include <sys/dirent.h>
#include <sys/file.h>
#include <sys/fcntl.h>
#include <sys/filedesc.h>
#include <sys/clock.h>
#include <sys/imgact.h>
#include <sys/ktr.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/sched.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <sys/vnode.h>
#include <sys/unistd.h>
#include <sys/wait.h>
#include <security/mac/mac_framework.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>
#include <machine/frame.h>
#include <machine/md_var.h>
#include <machine/pcb.h>
#include <machine/psl.h>
#include <machine/segments.h>
#include <machine/specialreg.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <amd64/linux/linux.h>
#include <amd64/linux/linux_proto.h>
#include <compat/linux/linux_ipc.h>
#include <compat/linux/linux_file.h>
#include <compat/linux/linux_misc.h>
#include <compat/linux/linux_mmap.h>
#include <compat/linux/linux_signal.h>
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_emul.h>
int
linux_execve(struct thread *td, struct linux_execve_args *args)
{
struct image_args eargs;
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
LINUX_CTR(execve);
error = exec_copyin_args(&eargs, path, UIO_SYSSPACE, args->argp,
args->envp);
free(path, M_TEMP);
if (error == 0)
error = linux_common_execve(td, &eargs);
return (error);
}
int
linux_set_upcall_kse(struct thread *td, register_t stack)
{
if (stack)
td->td_frame->tf_rsp = stack;
/*
* The newly created Linux thread returns
* to the user space by the same path that a parent do.
*/
td->td_frame->tf_rax = 0;
return (0);
}
int
linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
{
return (linux_mmap_common(td, PTROUT(args->addr), args->len, args->prot,
args->flags, args->fd, args->pgoff));
}
int
linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
{
return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, uap->prot));
}
int
linux_iopl(struct thread *td, struct linux_iopl_args *args)
{
int error;
LINUX_CTR(iopl);
if (args->level > 3)
return (EINVAL);
if ((error = priv_check(td, PRIV_IO)) != 0)
return (error);
if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
return (error);
td->td_frame->tf_rflags = (td->td_frame->tf_rflags & ~PSL_IOPL) |
(args->level * (PSL_IOPL / 3));
return (0);
}
int
linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
{
l_sigset_t lmask;
sigset_t sigmask;
int error;
LINUX_CTR2(rt_sigsuspend, "%p, %ld",
uap->newset, uap->sigsetsize);
if (uap->sigsetsize != sizeof(l_sigset_t))
return (EINVAL);
error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
if (error)
return (error);
linux_to_bsd_sigset(&lmask, &sigmask);
return (kern_sigsuspend(td, sigmask));
}
int
linux_pause(struct thread *td, struct linux_pause_args *args)
{
struct proc *p = td->td_proc;
sigset_t sigmask;
LINUX_CTR(pause);
PROC_LOCK(p);
sigmask = td->td_sigmask;
PROC_UNLOCK(p);
return (kern_sigsuspend(td, sigmask));
}
int
linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
{
stack_t ss, oss;
l_stack_t lss;
int error;
LINUX_CTR2(sigaltstack, "%p, %p", uap->uss, uap->uoss);
if (uap->uss != NULL) {
error = copyin(uap->uss, &lss, sizeof(l_stack_t));
if (error)
return (error);
ss.ss_sp = PTRIN(lss.ss_sp);
ss.ss_size = lss.ss_size;
ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
}
error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
(uap->uoss != NULL) ? &oss : NULL);
if (!error && uap->uoss != NULL) {
lss.ss_sp = PTROUT(oss.ss_sp);
lss.ss_size = oss.ss_size;
lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
}
return (error);
}
int
linux_arch_prctl(struct thread *td, struct linux_arch_prctl_args *args)
{
int error;
struct pcb *pcb;
LINUX_CTR2(arch_prctl, "0x%x, %p", args->code, args->addr);
error = ENOTSUP;
pcb = td->td_pcb;
switch (args->code) {
case LINUX_ARCH_GET_GS:
error = copyout(&pcb->pcb_gsbase, (unsigned long *)args->addr,
sizeof(args->addr));
break;
case LINUX_ARCH_SET_GS:
if (args->addr >= VM_MAXUSER_ADDRESS)
return(EPERM);
break;
case LINUX_ARCH_GET_FS:
error = copyout(&pcb->pcb_fsbase, (unsigned long *)args->addr,
sizeof(args->addr));
break;
case LINUX_ARCH_SET_FS:
error = linux_set_cloned_tls(td, (void *)args->addr);
break;
default:
error = EINVAL;
}
return (error);
}
int
linux_set_cloned_tls(struct thread *td, void *desc)
{
struct pcb *pcb;
if ((uint64_t)desc >= VM_MAXUSER_ADDRESS)
return (EPERM);
pcb = td->td_pcb;
pcb->pcb_fsbase = (register_t)desc;
td->td_frame->tf_fs = _ufssel;
return (0);
}