freebsd-dev/sys/i386/linux/linux_machdep.c
Edward Tomasz Napierala 52c81be11a Add linux_madvise(2) instead of having Linux apps call the native
FreeBSD madvise(2) directly.  While some of the flag values match,
most don't.

PR:		kern/230160
Reported by:	markj
Reviewed by:	markj
Discussed with:	brooks, kib
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D25272
2020-06-20 18:29:22 +00:00

738 lines
17 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/imgact.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/queue.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/sched.h>
#include <sys/signalvar.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <sys/systm.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/wait.h>
#include <machine/frame.h>
#include <machine/psl.h>
#include <machine/segments.h>
#include <machine/sysarch.h>
#include <vm/pmap.h>
#include <vm/vm.h>
#include <vm/vm_map.h>
#include <i386/linux/linux.h>
#include <i386/linux/linux_proto.h>
#include <compat/linux/linux_emul.h>
#include <compat/linux/linux_ipc.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 <i386/include/pcb.h> /* needed for pcb definition in linux_set_thread_area */
#include "opt_posix.h"
extern struct sysentvec elf32_freebsd_sysvec; /* defined in i386/i386/elf_machdep.c */
struct l_descriptor {
l_uint entry_number;
l_ulong base_addr;
l_uint limit;
l_uint seg_32bit:1;
l_uint contents:2;
l_uint read_exec_only:1;
l_uint limit_in_pages:1;
l_uint seg_not_present:1;
l_uint useable:1;
};
struct l_old_select_argv {
l_int nfds;
l_fd_set *readfds;
l_fd_set *writefds;
l_fd_set *exceptfds;
struct l_timeval *timeout;
};
int
linux_execve(struct thread *td, struct linux_execve_args *args)
{
struct image_args eargs;
char *newpath;
int error;
LCONVPATHEXIST(td, args->path, &newpath);
error = exec_copyin_args(&eargs, newpath, UIO_SYSSPACE,
args->argp, args->envp);
free(newpath, M_TEMP);
if (error == 0)
error = linux_common_execve(td, &eargs);
return (error);
}
struct l_ipc_kludge {
struct l_msgbuf *msgp;
l_long msgtyp;
};
int
linux_ipc(struct thread *td, struct linux_ipc_args *args)
{
switch (args->what & 0xFFFF) {
case LINUX_SEMOP: {
struct linux_semop_args a;
a.semid = args->arg1;
a.tsops = PTRIN(args->ptr);
a.nsops = args->arg2;
return (linux_semop(td, &a));
}
case LINUX_SEMGET: {
struct linux_semget_args a;
a.key = args->arg1;
a.nsems = args->arg2;
a.semflg = args->arg3;
return (linux_semget(td, &a));
}
case LINUX_SEMCTL: {
struct linux_semctl_args a;
int error;
a.semid = args->arg1;
a.semnum = args->arg2;
a.cmd = args->arg3;
error = copyin(PTRIN(args->ptr), &a.arg, sizeof(a.arg));
if (error)
return (error);
return (linux_semctl(td, &a));
}
case LINUX_MSGSND: {
struct linux_msgsnd_args a;
a.msqid = args->arg1;
a.msgp = PTRIN(args->ptr);
a.msgsz = args->arg2;
a.msgflg = args->arg3;
return (linux_msgsnd(td, &a));
}
case LINUX_MSGRCV: {
struct linux_msgrcv_args a;
a.msqid = args->arg1;
a.msgsz = args->arg2;
a.msgflg = args->arg3;
if ((args->what >> 16) == 0) {
struct l_ipc_kludge tmp;
int error;
if (args->ptr == 0)
return (EINVAL);
error = copyin(PTRIN(args->ptr), &tmp, sizeof(tmp));
if (error)
return (error);
a.msgp = PTRIN(tmp.msgp);
a.msgtyp = tmp.msgtyp;
} else {
a.msgp = PTRIN(args->ptr);
a.msgtyp = args->arg5;
}
return (linux_msgrcv(td, &a));
}
case LINUX_MSGGET: {
struct linux_msgget_args a;
a.key = args->arg1;
a.msgflg = args->arg2;
return (linux_msgget(td, &a));
}
case LINUX_MSGCTL: {
struct linux_msgctl_args a;
a.msqid = args->arg1;
a.cmd = args->arg2;
a.buf = PTRIN(args->ptr);
return (linux_msgctl(td, &a));
}
case LINUX_SHMAT: {
struct linux_shmat_args a;
l_uintptr_t addr;
int error;
a.shmid = args->arg1;
a.shmaddr = PTRIN(args->ptr);
a.shmflg = args->arg2;
error = linux_shmat(td, &a);
if (error != 0)
return (error);
addr = td->td_retval[0];
error = copyout(&addr, PTRIN(args->arg3), sizeof(addr));
td->td_retval[0] = 0;
return (error);
}
case LINUX_SHMDT: {
struct linux_shmdt_args a;
a.shmaddr = PTRIN(args->ptr);
return (linux_shmdt(td, &a));
}
case LINUX_SHMGET: {
struct linux_shmget_args a;
a.key = args->arg1;
a.size = args->arg2;
a.shmflg = args->arg3;
return (linux_shmget(td, &a));
}
case LINUX_SHMCTL: {
struct linux_shmctl_args a;
a.shmid = args->arg1;
a.cmd = args->arg2;
a.buf = PTRIN(args->ptr);
return (linux_shmctl(td, &a));
}
default:
break;
}
return (EINVAL);
}
int
linux_old_select(struct thread *td, struct linux_old_select_args *args)
{
struct l_old_select_argv linux_args;
struct linux_select_args newsel;
int error;
error = copyin(args->ptr, &linux_args, sizeof(linux_args));
if (error)
return (error);
newsel.nfds = linux_args.nfds;
newsel.readfds = linux_args.readfds;
newsel.writefds = linux_args.writefds;
newsel.exceptfds = linux_args.exceptfds;
newsel.timeout = linux_args.timeout;
return (linux_select(td, &newsel));
}
int
linux_set_cloned_tls(struct thread *td, void *desc)
{
struct segment_descriptor sd;
struct l_user_desc info;
int idx, error;
int a[2];
error = copyin(desc, &info, sizeof(struct l_user_desc));
if (error) {
linux_msg(td, "set_cloned_tls copyin failed!");
} else {
idx = info.entry_number;
/*
* looks like we're getting the idx we returned
* in the set_thread_area() syscall
*/
if (idx != 6 && idx != 3) {
linux_msg(td, "set_cloned_tls resetting idx!");
idx = 3;
}
/* this doesnt happen in practice */
if (idx == 6) {
/* we might copy out the entry_number as 3 */
info.entry_number = 3;
error = copyout(&info, desc, sizeof(struct l_user_desc));
if (error)
linux_msg(td, "set_cloned_tls copyout failed!");
}
a[0] = LINUX_LDT_entry_a(&info);
a[1] = LINUX_LDT_entry_b(&info);
memcpy(&sd, &a, sizeof(a));
/* set %gs */
td->td_pcb->pcb_gsd = sd;
td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
}
return (error);
}
int
linux_set_upcall_kse(struct thread *td, register_t stack)
{
if (stack)
td->td_frame->tf_esp = stack;
/*
* The newly created Linux thread returns
* to the user space by the same path that a parent do.
*/
td->td_frame->tf_eax = 0;
return (0);
}
int
linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
{
return (linux_mmap_common(td, args->addr, args->len, args->prot,
args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
PAGE_SIZE));
}
int
linux_mmap(struct thread *td, struct linux_mmap_args *args)
{
int error;
struct l_mmap_argv linux_args;
error = copyin(args->ptr, &linux_args, sizeof(linux_args));
if (error)
return (error);
return (linux_mmap_common(td, linux_args.addr, linux_args.len,
linux_args.prot, linux_args.flags, linux_args.fd,
(uint32_t)linux_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_madvise(struct thread *td, struct linux_madvise_args *uap)
{
return (linux_madvise_common(td, PTROUT(uap->addr), uap->len, uap->behav));
}
int
linux_ioperm(struct thread *td, struct linux_ioperm_args *args)
{
int error;
struct i386_ioperm_args iia;
iia.start = args->start;
iia.length = args->length;
iia.enable = args->enable;
error = i386_set_ioperm(td, &iia);
return (error);
}
int
linux_iopl(struct thread *td, struct linux_iopl_args *args)
{
int error;
if (args->level < 0 || 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_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) |
(args->level * (PSL_IOPL / 3));
return (0);
}
int
linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap)
{
int error;
struct i386_ldt_args ldt;
struct l_descriptor ld;
union descriptor desc;
int size, written;
switch (uap->func) {
case 0x00: /* read_ldt */
ldt.start = 0;
ldt.descs = uap->ptr;
ldt.num = uap->bytecount / sizeof(union descriptor);
error = i386_get_ldt(td, &ldt);
td->td_retval[0] *= sizeof(union descriptor);
break;
case 0x02: /* read_default_ldt = 0 */
size = 5*sizeof(struct l_desc_struct);
if (size > uap->bytecount)
size = uap->bytecount;
for (written = error = 0; written < size && error == 0; written++)
error = subyte((char *)uap->ptr + written, 0);
td->td_retval[0] = written;
break;
case 0x01: /* write_ldt */
case 0x11: /* write_ldt */
if (uap->bytecount != sizeof(ld))
return (EINVAL);
error = copyin(uap->ptr, &ld, sizeof(ld));
if (error)
return (error);
ldt.start = ld.entry_number;
ldt.descs = &desc;
ldt.num = 1;
desc.sd.sd_lolimit = (ld.limit & 0x0000ffff);
desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16;
desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff);
desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24;
desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) |
(ld.contents << 2);
desc.sd.sd_dpl = 3;
desc.sd.sd_p = (ld.seg_not_present ^ 1);
desc.sd.sd_xx = 0;
desc.sd.sd_def32 = ld.seg_32bit;
desc.sd.sd_gran = ld.limit_in_pages;
error = i386_set_ldt(td, &ldt, &desc);
break;
default:
error = ENOSYS;
break;
}
if (error == EOPNOTSUPP) {
linux_msg(td, "modify_ldt needs kernel option USER_LDT");
error = ENOSYS;
}
return (error);
}
int
linux_sigaction(struct thread *td, struct linux_sigaction_args *args)
{
l_osigaction_t osa;
l_sigaction_t act, oact;
int error;
if (args->nsa != NULL) {
error = copyin(args->nsa, &osa, sizeof(l_osigaction_t));
if (error)
return (error);
act.lsa_handler = osa.lsa_handler;
act.lsa_flags = osa.lsa_flags;
act.lsa_restorer = osa.lsa_restorer;
LINUX_SIGEMPTYSET(act.lsa_mask);
act.lsa_mask.__mask = osa.lsa_mask;
}
error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL,
args->osa ? &oact : NULL);
if (args->osa != NULL && !error) {
osa.lsa_handler = oact.lsa_handler;
osa.lsa_flags = oact.lsa_flags;
osa.lsa_restorer = oact.lsa_restorer;
osa.lsa_mask = oact.lsa_mask.__mask;
error = copyout(&osa, args->osa, sizeof(l_osigaction_t));
}
return (error);
}
/*
* Linux has two extra args, restart and oldmask. We dont use these,
* but it seems that "restart" is actually a context pointer that
* enables the signal to happen with a different register set.
*/
int
linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args)
{
sigset_t sigmask;
l_sigset_t mask;
LINUX_SIGEMPTYSET(mask);
mask.__mask = args->mask;
linux_to_bsd_sigset(&mask, &sigmask);
return (kern_sigsuspend(td, sigmask));
}
int
linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
{
l_sigset_t lmask;
sigset_t sigmask;
int error;
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;
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;
if (uap->uss != NULL) {
error = copyin(uap->uss, &lss, sizeof(l_stack_t));
if (error)
return (error);
ss.ss_sp = 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 = 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_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args)
{
struct l_user_desc info;
int error;
int idx;
int a[2];
struct segment_descriptor sd;
error = copyin(args->desc, &info, sizeof(struct l_user_desc));
if (error)
return (error);
idx = info.entry_number;
/*
* Semantics of Linux version: every thread in the system has array of
* 3 tls descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown. This
* syscall loads one of the selected tls decriptors with a value and
* also loads GDT descriptors 6, 7 and 8 with the content of the
* per-thread descriptors.
*
* Semantics of FreeBSD version: I think we can ignore that Linux has 3
* per-thread descriptors and use just the 1st one. The tls_array[]
* is used only in set/get-thread_area() syscalls and for loading the
* GDT descriptors. In FreeBSD we use just one GDT descriptor for TLS
* so we will load just one.
*
* XXX: this doesn't work when a user space process tries to use more
* than 1 TLS segment. Comment in the Linux sources says wine might do
* this.
*/
/*
* we support just GLIBC TLS now
* we should let 3 proceed as well because we use this segment so
* if code does two subsequent calls it should succeed
*/
if (idx != 6 && idx != -1 && idx != 3)
return (EINVAL);
/*
* we have to copy out the GDT entry we use
* FreeBSD uses GDT entry #3 for storing %gs so load that
*
* XXX: what if a user space program doesn't check this value and tries
* to use 6, 7 or 8?
*/
idx = info.entry_number = 3;
error = copyout(&info, args->desc, sizeof(struct l_user_desc));
if (error)
return (error);
if (LINUX_LDT_empty(&info)) {
a[0] = 0;
a[1] = 0;
} else {
a[0] = LINUX_LDT_entry_a(&info);
a[1] = LINUX_LDT_entry_b(&info);
}
memcpy(&sd, &a, sizeof(a));
/* this is taken from i386 version of cpu_set_user_tls() */
critical_enter();
/* set %gs */
td->td_pcb->pcb_gsd = sd;
PCPU_GET(fsgs_gdt)[1] = sd;
load_gs(GSEL(GUGS_SEL, SEL_UPL));
critical_exit();
return (0);
}
int
linux_get_thread_area(struct thread *td, struct linux_get_thread_area_args *args)
{
struct l_user_desc info;
int error;
int idx;
struct l_desc_struct desc;
struct segment_descriptor sd;
error = copyin(args->desc, &info, sizeof(struct l_user_desc));
if (error)
return (error);
idx = info.entry_number;
/* XXX: I am not sure if we want 3 to be allowed too. */
if (idx != 6 && idx != 3)
return (EINVAL);
idx = 3;
memset(&info, 0, sizeof(info));
sd = PCPU_GET(fsgs_gdt)[1];
memcpy(&desc, &sd, sizeof(desc));
info.entry_number = idx;
info.base_addr = LINUX_GET_BASE(&desc);
info.limit = LINUX_GET_LIMIT(&desc);
info.seg_32bit = LINUX_GET_32BIT(&desc);
info.contents = LINUX_GET_CONTENTS(&desc);
info.read_exec_only = !LINUX_GET_WRITABLE(&desc);
info.limit_in_pages = LINUX_GET_LIMIT_PAGES(&desc);
info.seg_not_present = !LINUX_GET_PRESENT(&desc);
info.useable = LINUX_GET_USEABLE(&desc);
error = copyout(&info, args->desc, sizeof(struct l_user_desc));
if (error)
return (EFAULT);
return (0);
}
/* XXX: this wont work with module - convert it */
int
linux_mq_open(struct thread *td, struct linux_mq_open_args *args)
{
#ifdef P1003_1B_MQUEUE
return (sys_kmq_open(td, (struct kmq_open_args *)args));
#else
return (ENOSYS);
#endif
}
int
linux_mq_unlink(struct thread *td, struct linux_mq_unlink_args *args)
{
#ifdef P1003_1B_MQUEUE
return (sys_kmq_unlink(td, (struct kmq_unlink_args *)args));
#else
return (ENOSYS);
#endif
}
int
linux_mq_timedsend(struct thread *td, struct linux_mq_timedsend_args *args)
{
#ifdef P1003_1B_MQUEUE
return (sys_kmq_timedsend(td, (struct kmq_timedsend_args *)args));
#else
return (ENOSYS);
#endif
}
int
linux_mq_timedreceive(struct thread *td, struct linux_mq_timedreceive_args *args)
{
#ifdef P1003_1B_MQUEUE
return (sys_kmq_timedreceive(td, (struct kmq_timedreceive_args *)args));
#else
return (ENOSYS);
#endif
}
int
linux_mq_notify(struct thread *td, struct linux_mq_notify_args *args)
{
#ifdef P1003_1B_MQUEUE
return (sys_kmq_notify(td, (struct kmq_notify_args *)args));
#else
return (ENOSYS);
#endif
}
int
linux_mq_getsetattr(struct thread *td, struct linux_mq_getsetattr_args *args)
{
#ifdef P1003_1B_MQUEUE
return (sys_kmq_setattr(td, (struct kmq_setattr_args *)args));
#else
return (ENOSYS);
#endif
}