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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/parisc/kernel/signal32.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/parisc/kernel/signal32.c')
-rw-r--r--arch/parisc/kernel/signal32.c520
1 files changed, 520 insertions, 0 deletions
diff --git a/arch/parisc/kernel/signal32.c b/arch/parisc/kernel/signal32.c
new file mode 100644
index 00000000000..e1413243076
--- /dev/null
+++ b/arch/parisc/kernel/signal32.c
@@ -0,0 +1,520 @@
+/* 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/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[31] >> 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[31]+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);
+}
+