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linux/arch/parisc/kernel/signal32.c

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/* Signal support for 32-bit kernel builds
*
* Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org>
* Copyright (C) 2006 Kyle McMartin <kyle at parisc-linux.org>
*
* Code was mostly borrowed from kernel/signal.c.
* See kernel/signal.c for additional Copyrights.
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/compat.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/unistd.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/syscalls.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <asm/uaccess.h>
#include "signal32.h"
#include "sys32.h"
#define DEBUG_COMPAT_SIG 0
#define DEBUG_COMPAT_SIG_LEVEL 2
#if DEBUG_COMPAT_SIG
#define DBG(LEVEL, ...) \
((DEBUG_COMPAT_SIG_LEVEL >= LEVEL) \
? printk(__VA_ARGS__) : (void) 0)
#else
#define DBG(LEVEL, ...)
#endif
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
inline void
sigset_32to64(sigset_t *s64, compat_sigset_t *s32)
{
s64->sig[0] = s32->sig[0] | ((unsigned long)s32->sig[1] << 32);
}
inline void
sigset_64to32(compat_sigset_t *s32, sigset_t *s64)
{
s32->sig[0] = s64->sig[0] & 0xffffffffUL;
s32->sig[1] = (s64->sig[0] >> 32) & 0xffffffffUL;
}
static int
put_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz)
{
compat_sigset_t s;
if (sz != sizeof *set) panic("put_sigset32()");
sigset_64to32(&s, set);
return copy_to_user(up, &s, sizeof s);
}
static int
get_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz)
{
compat_sigset_t s;
int r;
if (sz != sizeof *set) panic("put_sigset32()");
if ((r = copy_from_user(&s, up, sz)) == 0) {
sigset_32to64(set, &s);
}
return r;
}
int sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, compat_sigset_t __user *oset,
unsigned int sigsetsize)
{
sigset_t old_set, new_set;
int ret;
if (set && get_sigset32(set, &new_set, sigsetsize))
return -EFAULT;
KERNEL_SYSCALL(ret, sys_rt_sigprocmask, how, set ? (sigset_t __user *)&new_set : NULL,
oset ? (sigset_t __user *)&old_set : NULL, sigsetsize);
if (!ret && oset && put_sigset32(oset, &old_set, sigsetsize))
return -EFAULT;
return ret;
}
int sys32_rt_sigpending(compat_sigset_t __user *uset, unsigned int sigsetsize)
{
int ret;
sigset_t set;
KERNEL_SYSCALL(ret, sys_rt_sigpending, (sigset_t __user *)&set, sigsetsize);
if (!ret && put_sigset32(uset, &set, sigsetsize))
return -EFAULT;
return ret;
}
long
sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, struct sigaction32 __user *oact,
size_t sigsetsize)
{
struct k_sigaction32 new_sa32, old_sa32;
struct k_sigaction new_sa, old_sa;
int ret = -EINVAL;
if (act) {
if (copy_from_user(&new_sa32.sa, act, sizeof new_sa32.sa))
return -EFAULT;
new_sa.sa.sa_handler = (__sighandler_t)(unsigned long)new_sa32.sa.sa_handler;
new_sa.sa.sa_flags = new_sa32.sa.sa_flags;
sigset_32to64(&new_sa.sa.sa_mask, &new_sa32.sa.sa_mask);
}
ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
if (!ret && oact) {
sigset_64to32(&old_sa32.sa.sa_mask, &old_sa.sa.sa_mask);
old_sa32.sa.sa_flags = old_sa.sa.sa_flags;
old_sa32.sa.sa_handler = (__sighandler_t32)(unsigned long)old_sa.sa.sa_handler;
if (copy_to_user(oact, &old_sa32.sa, sizeof old_sa32.sa))
return -EFAULT;
}
return ret;
}
int
do_sigaltstack32 (const compat_stack_t __user *uss32, compat_stack_t __user *uoss32, unsigned long sp)
{
compat_stack_t ss32, oss32;
stack_t ss, oss;
stack_t *ssp = NULL, *ossp = NULL;
int ret;
if (uss32) {
if (copy_from_user(&ss32, uss32, sizeof ss32))
return -EFAULT;
ss.ss_sp = (void __user *)(unsigned long)ss32.ss_sp;
ss.ss_flags = ss32.ss_flags;
ss.ss_size = ss32.ss_size;
ssp = &ss;
}
if (uoss32)
ossp = &oss;
KERNEL_SYSCALL(ret, do_sigaltstack, (const stack_t __user *)ssp, (stack_t __user *)ossp, sp);
if (!ret && uoss32) {
oss32.ss_sp = (unsigned int)(unsigned long)oss.ss_sp;
oss32.ss_flags = oss.ss_flags;
oss32.ss_size = oss.ss_size;
if (copy_to_user(uoss32, &oss32, sizeof *uoss32))
return -EFAULT;
}
return ret;
}
long
restore_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf,
struct pt_regs *regs)
{
long err = 0;
compat_uint_t compat_reg;
compat_uint_t compat_regt;
int regn;
/* When loading 32-bit values into 64-bit registers make
sure to clear the upper 32-bits */
DBG(2,"restore_sigcontext32: PER_LINUX32 process\n");
DBG(2,"restore_sigcontext32: sc = 0x%p, rf = 0x%p, regs = 0x%p\n", sc, rf, regs);
DBG(2,"restore_sigcontext32: compat_sigcontext is %#lx bytes\n", sizeof(*sc));
for(regn=0; regn < 32; regn++){
err |= __get_user(compat_reg,&sc->sc_gr[regn]);
regs->gr[regn] = compat_reg;
/* Load upper half */
err |= __get_user(compat_regt,&rf->rf_gr[regn]);
regs->gr[regn] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(3,"restore_sigcontext32: gr%02d = %#lx (%#x / %#x)\n",
regn, regs->gr[regn], compat_regt, compat_reg);
}
DBG(2,"restore_sigcontext32: sc->sc_fr = 0x%p (%#lx)\n",sc->sc_fr, sizeof(sc->sc_fr));
/* XXX: BE WARNED FR's are 64-BIT! */
err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
/* Better safe than sorry, pass __get_user two things of
the same size and let gcc do the upward conversion to
64-bits */
err |= __get_user(compat_reg, &sc->sc_iaoq[0]);
/* Load upper half */
err |= __get_user(compat_regt, &rf->rf_iaoq[0]);
regs->iaoq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(2,"restore_sigcontext32: upper half of iaoq[0] = %#lx\n", compat_regt);
DBG(2,"restore_sigcontext32: sc->sc_iaoq[0] = %p => %#x\n",
&sc->sc_iaoq[0], compat_reg);
err |= __get_user(compat_reg, &sc->sc_iaoq[1]);
/* Load upper half */
err |= __get_user(compat_regt, &rf->rf_iaoq[1]);
regs->iaoq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(2,"restore_sigcontext32: upper half of iaoq[1] = %#lx\n", compat_regt);
DBG(2,"restore_sigcontext32: sc->sc_iaoq[1] = %p => %#x\n",
&sc->sc_iaoq[1],compat_reg);
DBG(2,"restore_sigcontext32: iaoq is %#lx / %#lx\n",
regs->iaoq[0],regs->iaoq[1]);
err |= __get_user(compat_reg, &sc->sc_iasq[0]);
/* Load the upper half for iasq */
err |= __get_user(compat_regt, &rf->rf_iasq[0]);
regs->iasq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(2,"restore_sigcontext32: upper half of iasq[0] = %#lx\n", compat_regt);
err |= __get_user(compat_reg, &sc->sc_iasq[1]);
/* Load the upper half for iasq */
err |= __get_user(compat_regt, &rf->rf_iasq[1]);
regs->iasq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(2,"restore_sigcontext32: upper half of iasq[1] = %#lx\n", compat_regt);
DBG(2,"restore_sigcontext32: iasq is %#lx / %#lx\n",
regs->iasq[0],regs->iasq[1]);
err |= __get_user(compat_reg, &sc->sc_sar);
/* Load the upper half for sar */
err |= __get_user(compat_regt, &rf->rf_sar);
regs->sar = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(2,"restore_sigcontext32: upper_half & sar = %#lx\n", compat_regt);
DBG(2,"restore_sigcontext32: sar is %#lx\n", regs->sar);
DBG(2,"restore_sigcontext32: r28 is %ld\n", regs->gr[28]);
return err;
}
/*
* Set up the sigcontext structure for this process.
* This is not an easy task if the kernel is 64-bit, it will require
* that we examine the process personality to determine if we need to
* truncate for a 32-bit userspace.
*/
long
setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf,
struct pt_regs *regs, int in_syscall)
{
compat_int_t flags = 0;
long err = 0;
compat_uint_t compat_reg;
compat_uint_t compat_regb;
int regn;
if (on_sig_stack((unsigned long) sc))
flags |= PARISC_SC_FLAG_ONSTACK;
if (in_syscall) {
DBG(1,"setup_sigcontext32: in_syscall\n");
flags |= PARISC_SC_FLAG_IN_SYSCALL;
/* Truncate gr31 */
compat_reg = (compat_uint_t)(regs->gr[31]);
/* regs->iaoq is undefined in the syscall return path */
err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
&sc->sc_iaoq[0], compat_reg);
/* Store upper half */
compat_reg = (compat_uint_t)(regs->gr[32] >> 32);
err |= __put_user(compat_reg, &rf->rf_iaoq[0]);
DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
compat_reg = (compat_uint_t)(regs->gr[31]+4);
err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
&sc->sc_iaoq[1], compat_reg);
/* Store upper half */
compat_reg = (compat_uint_t)((regs->gr[32]+4) >> 32);
err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
/* Truncate sr3 */
compat_reg = (compat_uint_t)(regs->sr[3]);
err |= __put_user(compat_reg, &sc->sc_iasq[0]);
err |= __put_user(compat_reg, &sc->sc_iasq[1]);
/* Store upper half */
compat_reg = (compat_uint_t)(regs->sr[3] >> 32);
err |= __put_user(compat_reg, &rf->rf_iasq[0]);
err |= __put_user(compat_reg, &rf->rf_iasq[1]);
DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);
DBG(1,"setup_sigcontext32: iaoq %#lx / %#lx\n",
regs->gr[31], regs->gr[31]+4);
} else {
compat_reg = (compat_uint_t)(regs->iaoq[0]);
err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
&sc->sc_iaoq[0], compat_reg);
/* Store upper half */
compat_reg = (compat_uint_t)(regs->iaoq[0] >> 32);
err |= __put_user(compat_reg, &rf->rf_iaoq[0]);
DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
compat_reg = (compat_uint_t)(regs->iaoq[1]);
err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
&sc->sc_iaoq[1], compat_reg);
/* Store upper half */
compat_reg = (compat_uint_t)(regs->iaoq[1] >> 32);
err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
compat_reg = (compat_uint_t)(regs->iasq[0]);
err |= __put_user(compat_reg, &sc->sc_iasq[0]);
DBG(2,"setup_sigcontext32: sc->sc_iasq[0] = %p <= %#x\n",
&sc->sc_iasq[0], compat_reg);
/* Store upper half */
compat_reg = (compat_uint_t)(regs->iasq[0] >> 32);
err |= __put_user(compat_reg, &rf->rf_iasq[0]);
DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
compat_reg = (compat_uint_t)(regs->iasq[1]);
err |= __put_user(compat_reg, &sc->sc_iasq[1]);
DBG(2,"setup_sigcontext32: sc->sc_iasq[1] = %p <= %#x\n",
&sc->sc_iasq[1], compat_reg);
/* Store upper half */
compat_reg = (compat_uint_t)(regs->iasq[1] >> 32);
err |= __put_user(compat_reg, &rf->rf_iasq[1]);
DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);
/* Print out the IAOQ for debugging */
DBG(1,"setup_sigcontext32: ia0q %#lx / %#lx\n",
regs->iaoq[0], regs->iaoq[1]);
}
err |= __put_user(flags, &sc->sc_flags);
DBG(1,"setup_sigcontext32: Truncating general registers.\n");
for(regn=0; regn < 32; regn++){
/* Truncate a general register */
compat_reg = (compat_uint_t)(regs->gr[regn]);
err |= __put_user(compat_reg, &sc->sc_gr[regn]);
/* Store upper half */
compat_regb = (compat_uint_t)(regs->gr[regn] >> 32);
err |= __put_user(compat_regb, &rf->rf_gr[regn]);
/* DEBUG: Write out the "upper / lower" register data */
DBG(2,"setup_sigcontext32: gr%02d = %#x / %#x\n", regn,
compat_regb, compat_reg);
}
/* Copy the floating point registers (same size)
XXX: BE WARNED FR's are 64-BIT! */
DBG(1,"setup_sigcontext32: Copying from regs to sc, "
"sc->sc_fr size = %#lx, regs->fr size = %#lx\n",
sizeof(regs->fr), sizeof(sc->sc_fr));
err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
compat_reg = (compat_uint_t)(regs->sar);
err |= __put_user(compat_reg, &sc->sc_sar);
DBG(2,"setup_sigcontext32: sar is %#x\n", compat_reg);
/* Store upper half */
compat_reg = (compat_uint_t)(regs->sar >> 32);
err |= __put_user(compat_reg, &rf->rf_sar);
DBG(2,"setup_sigcontext32: upper half sar = %#x\n", compat_reg);
DBG(1,"setup_sigcontext32: r28 is %ld\n", regs->gr[28]);
return err;
}
int
copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
{
compat_uptr_t addr;
int err;
if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
return -EFAULT;
err = __get_user(to->si_signo, &from->si_signo);
err |= __get_user(to->si_errno, &from->si_errno);
err |= __get_user(to->si_code, &from->si_code);
if (to->si_code < 0)
err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
else {
switch (to->si_code >> 16) {
case __SI_CHLD >> 16:
err |= __get_user(to->si_utime, &from->si_utime);
err |= __get_user(to->si_stime, &from->si_stime);
err |= __get_user(to->si_status, &from->si_status);
default:
err |= __get_user(to->si_pid, &from->si_pid);
err |= __get_user(to->si_uid, &from->si_uid);
break;
case __SI_FAULT >> 16:
err |= __get_user(addr, &from->si_addr);
to->si_addr = compat_ptr(addr);
break;
case __SI_POLL >> 16:
err |= __get_user(to->si_band, &from->si_band);
err |= __get_user(to->si_fd, &from->si_fd);
break;
case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
case __SI_MESGQ >> 16:
err |= __get_user(to->si_pid, &from->si_pid);
err |= __get_user(to->si_uid, &from->si_uid);
err |= __get_user(to->si_int, &from->si_int);
break;
}
}
return err;
}
int
copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
{
compat_uptr_t addr;
compat_int_t val;
int err;
if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
return -EFAULT;
/* If you change siginfo_t structure, please be sure
this code is fixed accordingly.
It should never copy any pad contained in the structure
to avoid security leaks, but must copy the generic
3 ints plus the relevant union member.
This routine must convert siginfo from 64bit to 32bit as well
at the same time. */
err = __put_user(from->si_signo, &to->si_signo);
err |= __put_user(from->si_errno, &to->si_errno);
err |= __put_user((short)from->si_code, &to->si_code);
if (from->si_code < 0)
err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
else {
switch (from->si_code >> 16) {
case __SI_CHLD >> 16:
err |= __put_user(from->si_utime, &to->si_utime);
err |= __put_user(from->si_stime, &to->si_stime);
err |= __put_user(from->si_status, &to->si_status);
default:
err |= __put_user(from->si_pid, &to->si_pid);
err |= __put_user(from->si_uid, &to->si_uid);
break;
case __SI_FAULT >> 16:
addr = ptr_to_compat(from->si_addr);
err |= __put_user(addr, &to->si_addr);
break;
case __SI_POLL >> 16:
err |= __put_user(from->si_band, &to->si_band);
err |= __put_user(from->si_fd, &to->si_fd);
break;
case __SI_TIMER >> 16:
err |= __put_user(from->si_tid, &to->si_tid);
err |= __put_user(from->si_overrun, &to->si_overrun);
val = (compat_int_t)from->si_int;
err |= __put_user(val, &to->si_int);
break;
case __SI_RT >> 16: /* Not generated by the kernel as of now. */
case __SI_MESGQ >> 16:
err |= __put_user(from->si_uid, &to->si_uid);
err |= __put_user(from->si_pid, &to->si_pid);
val = (compat_int_t)from->si_int;
err |= __put_user(val, &to->si_int);
break;
}
}
return err;
}
asmlinkage long compat_sys_rt_sigqueueinfo(int pid, int sig,
struct compat_siginfo __user *uinfo)
{
siginfo_t info;
if (copy_siginfo_from_user32(&info, uinfo))
return -EFAULT;
/* Not even root can pretend to send signals from the kernel.
Nor can they impersonate a kill(), which adds source info. */
if (info.si_code >= 0)
return -EPERM;
info.si_signo = sig;
/* POSIX.1b doesn't mention process groups. */
return kill_proc_info(sig, &info, pid);
}
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