![Richard Weinberger](/assets/img/avatar_default.png)
Use sigsp() instead of the open coded variant. Signed-off-by: Richard Weinberger <richard@nod.at>
607 lines
16 KiB
C
607 lines
16 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1994 - 2000, 2006 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#include <linux/cache.h>
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#include <linux/compat.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/syscalls.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/suspend.h>
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#include <linux/compiler.h>
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#include <linux/uaccess.h>
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#include <asm/abi.h>
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#include <asm/asm.h>
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#include <asm/compat-signal.h>
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#include <linux/bitops.h>
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#include <asm/cacheflush.h>
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#include <asm/sim.h>
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#include <asm/ucontext.h>
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#include <asm/fpu.h>
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#include <asm/war.h>
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#include <asm/vdso.h>
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#include <asm/dsp.h>
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#include "signal-common.h"
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static int (*save_fp_context32)(struct sigcontext32 __user *sc);
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static int (*restore_fp_context32)(struct sigcontext32 __user *sc);
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extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc);
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extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc);
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/*
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* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
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*/
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#define __NR_O32_restart_syscall 4253
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/* 32-bit compatibility types */
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typedef unsigned int __sighandler32_t;
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typedef void (*vfptr_t)(void);
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struct ucontext32 {
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u32 uc_flags;
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s32 uc_link;
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compat_stack_t uc_stack;
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struct sigcontext32 uc_mcontext;
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compat_sigset_t uc_sigmask; /* mask last for extensibility */
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};
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struct sigframe32 {
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u32 sf_ass[4]; /* argument save space for o32 */
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u32 sf_pad[2]; /* Was: signal trampoline */
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struct sigcontext32 sf_sc;
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compat_sigset_t sf_mask;
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};
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struct rt_sigframe32 {
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u32 rs_ass[4]; /* argument save space for o32 */
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u32 rs_pad[2]; /* Was: signal trampoline */
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compat_siginfo_t rs_info;
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struct ucontext32 rs_uc;
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};
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/*
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* Thread saved context copy to/from a signal context presumed to be on the
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* user stack, and therefore accessed with appropriate macros from uaccess.h.
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*/
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static int copy_fp_to_sigcontext32(struct sigcontext32 __user *sc)
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{
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int i;
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int err = 0;
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int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
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for (i = 0; i < NUM_FPU_REGS; i += inc) {
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err |=
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__put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0),
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&sc->sc_fpregs[i]);
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}
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err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
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return err;
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}
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static int copy_fp_from_sigcontext32(struct sigcontext32 __user *sc)
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{
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int i;
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int err = 0;
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int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
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u64 fpr_val;
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for (i = 0; i < NUM_FPU_REGS; i += inc) {
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err |= __get_user(fpr_val, &sc->sc_fpregs[i]);
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set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val);
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}
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err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
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return err;
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}
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/*
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* sigcontext handlers
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*/
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static int protected_save_fp_context32(struct sigcontext32 __user *sc)
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{
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int err;
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while (1) {
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lock_fpu_owner();
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if (is_fpu_owner()) {
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err = save_fp_context32(sc);
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unlock_fpu_owner();
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} else {
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unlock_fpu_owner();
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err = copy_fp_to_sigcontext32(sc);
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}
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if (likely(!err))
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break;
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/* touch the sigcontext and try again */
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err = __put_user(0, &sc->sc_fpregs[0]) |
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__put_user(0, &sc->sc_fpregs[31]) |
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__put_user(0, &sc->sc_fpc_csr);
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if (err)
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break; /* really bad sigcontext */
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}
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return err;
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}
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static int protected_restore_fp_context32(struct sigcontext32 __user *sc)
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{
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int err, tmp __maybe_unused;
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while (1) {
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lock_fpu_owner();
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if (is_fpu_owner()) {
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err = restore_fp_context32(sc);
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unlock_fpu_owner();
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} else {
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unlock_fpu_owner();
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err = copy_fp_from_sigcontext32(sc);
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}
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if (likely(!err))
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break;
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/* touch the sigcontext and try again */
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err = __get_user(tmp, &sc->sc_fpregs[0]) |
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__get_user(tmp, &sc->sc_fpregs[31]) |
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__get_user(tmp, &sc->sc_fpc_csr);
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if (err)
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break; /* really bad sigcontext */
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}
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return err;
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}
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static int setup_sigcontext32(struct pt_regs *regs,
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struct sigcontext32 __user *sc)
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{
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int err = 0;
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int i;
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u32 used_math;
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err |= __put_user(regs->cp0_epc, &sc->sc_pc);
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err |= __put_user(0, &sc->sc_regs[0]);
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for (i = 1; i < 32; i++)
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err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
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err |= __put_user(regs->hi, &sc->sc_mdhi);
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err |= __put_user(regs->lo, &sc->sc_mdlo);
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if (cpu_has_dsp) {
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err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
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err |= __put_user(mfhi1(), &sc->sc_hi1);
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err |= __put_user(mflo1(), &sc->sc_lo1);
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err |= __put_user(mfhi2(), &sc->sc_hi2);
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err |= __put_user(mflo2(), &sc->sc_lo2);
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err |= __put_user(mfhi3(), &sc->sc_hi3);
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err |= __put_user(mflo3(), &sc->sc_lo3);
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}
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used_math = !!used_math();
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err |= __put_user(used_math, &sc->sc_used_math);
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if (used_math) {
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/*
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* Save FPU state to signal context. Signal handler
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* will "inherit" current FPU state.
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*/
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err |= protected_save_fp_context32(sc);
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}
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return err;
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}
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static int
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check_and_restore_fp_context32(struct sigcontext32 __user *sc)
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{
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int err, sig;
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err = sig = fpcsr_pending(&sc->sc_fpc_csr);
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if (err > 0)
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err = 0;
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err |= protected_restore_fp_context32(sc);
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return err ?: sig;
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}
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static int restore_sigcontext32(struct pt_regs *regs,
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struct sigcontext32 __user *sc)
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{
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u32 used_math;
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int err = 0;
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s32 treg;
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int i;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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err |= __get_user(regs->cp0_epc, &sc->sc_pc);
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err |= __get_user(regs->hi, &sc->sc_mdhi);
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err |= __get_user(regs->lo, &sc->sc_mdlo);
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if (cpu_has_dsp) {
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err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
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err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
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err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
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err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
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err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
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err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
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err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
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}
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for (i = 1; i < 32; i++)
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err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
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err |= __get_user(used_math, &sc->sc_used_math);
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conditional_used_math(used_math);
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if (used_math) {
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/* restore fpu context if we have used it before */
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if (!err)
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err = check_and_restore_fp_context32(sc);
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} else {
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/* signal handler may have used FPU. Give it up. */
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lose_fpu(0);
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}
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return err;
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}
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/*
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*
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*/
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extern void __put_sigset_unknown_nsig(void);
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extern void __get_sigset_unknown_nsig(void);
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static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf)
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{
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int err = 0;
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if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
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return -EFAULT;
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switch (_NSIG_WORDS) {
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default:
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__put_sigset_unknown_nsig();
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case 2:
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err |= __put_user(kbuf->sig[1] >> 32, &ubuf->sig[3]);
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err |= __put_user(kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);
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case 1:
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err |= __put_user(kbuf->sig[0] >> 32, &ubuf->sig[1]);
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err |= __put_user(kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);
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}
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return err;
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}
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static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t __user *ubuf)
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{
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int err = 0;
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unsigned long sig[4];
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if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
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return -EFAULT;
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switch (_NSIG_WORDS) {
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default:
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__get_sigset_unknown_nsig();
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case 2:
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err |= __get_user(sig[3], &ubuf->sig[3]);
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err |= __get_user(sig[2], &ubuf->sig[2]);
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kbuf->sig[1] = sig[2] | (sig[3] << 32);
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case 1:
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err |= __get_user(sig[1], &ubuf->sig[1]);
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err |= __get_user(sig[0], &ubuf->sig[0]);
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kbuf->sig[0] = sig[0] | (sig[1] << 32);
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}
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return err;
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}
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/*
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* Atomically swap in the new signal mask, and wait for a signal.
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*/
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asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset)
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{
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return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t));
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}
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SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act,
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struct compat_sigaction __user *, oact)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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int err = 0;
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if (act) {
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old_sigset_t mask;
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s32 handler;
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if (!access_ok(VERIFY_READ, act, sizeof(*act)))
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return -EFAULT;
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err |= __get_user(handler, &act->sa_handler);
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new_ka.sa.sa_handler = (void __user *)(s64)handler;
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err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
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err |= __get_user(mask, &act->sa_mask.sig[0]);
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if (err)
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return -EFAULT;
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siginitset(&new_ka.sa.sa_mask, mask);
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
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return -EFAULT;
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err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
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&oact->sa_handler);
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err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
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err |= __put_user(0, &oact->sa_mask.sig[1]);
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err |= __put_user(0, &oact->sa_mask.sig[2]);
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err |= __put_user(0, &oact->sa_mask.sig[3]);
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if (err)
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return -EFAULT;
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}
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return ret;
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}
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int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
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{
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int err;
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if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
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return -EFAULT;
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/* If you change siginfo_t structure, please be sure
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this code is fixed accordingly.
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It should never copy any pad contained in the structure
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to avoid security leaks, but must copy the generic
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3 ints plus the relevant union member.
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This routine must convert siginfo from 64bit to 32bit as well
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at the same time. */
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err = __put_user(from->si_signo, &to->si_signo);
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err |= __put_user(from->si_errno, &to->si_errno);
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err |= __put_user((short)from->si_code, &to->si_code);
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if (from->si_code < 0)
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err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
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else {
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switch (from->si_code >> 16) {
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case __SI_TIMER >> 16:
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err |= __put_user(from->si_tid, &to->si_tid);
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err |= __put_user(from->si_overrun, &to->si_overrun);
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err |= __put_user(from->si_int, &to->si_int);
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break;
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case __SI_CHLD >> 16:
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err |= __put_user(from->si_utime, &to->si_utime);
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err |= __put_user(from->si_stime, &to->si_stime);
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err |= __put_user(from->si_status, &to->si_status);
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default:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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break;
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case __SI_FAULT >> 16:
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err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
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break;
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case __SI_POLL >> 16:
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err |= __put_user(from->si_band, &to->si_band);
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err |= __put_user(from->si_fd, &to->si_fd);
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break;
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case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
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case __SI_MESGQ >> 16:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_int, &to->si_int);
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break;
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}
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}
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return err;
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}
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int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
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{
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memset(to, 0, sizeof *to);
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if (copy_from_user(to, from, 3*sizeof(int)) ||
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copy_from_user(to->_sifields._pad,
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from->_sifields._pad, SI_PAD_SIZE32))
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return -EFAULT;
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return 0;
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}
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asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
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{
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struct sigframe32 __user *frame;
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sigset_t blocked;
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int sig;
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frame = (struct sigframe32 __user *) regs.regs[29];
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
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goto badframe;
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set_current_blocked(&blocked);
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sig = restore_sigcontext32(®s, &frame->sf_sc);
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if (sig < 0)
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goto badframe;
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else if (sig)
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force_sig(sig, current);
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/*
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* Don't let your children do this ...
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*/
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__asm__ __volatile__(
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"move\t$29, %0\n\t"
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"j\tsyscall_exit"
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:/* no outputs */
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:"r" (®s));
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/* Unreached */
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badframe:
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force_sig(SIGSEGV, current);
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}
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asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
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{
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struct rt_sigframe32 __user *frame;
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sigset_t set;
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int sig;
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frame = (struct rt_sigframe32 __user *) regs.regs[29];
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
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goto badframe;
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set_current_blocked(&set);
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sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext);
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if (sig < 0)
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goto badframe;
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else if (sig)
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force_sig(sig, current);
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if (compat_restore_altstack(&frame->rs_uc.uc_stack))
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goto badframe;
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/*
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* Don't let your children do this ...
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*/
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__asm__ __volatile__(
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"move\t$29, %0\n\t"
|
|
"j\tsyscall_exit"
|
|
:/* no outputs */
|
|
:"r" (®s));
|
|
/* Unreached */
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
}
|
|
|
|
static int setup_frame_32(void *sig_return, struct ksignal *ksig,
|
|
struct pt_regs *regs, sigset_t *set)
|
|
{
|
|
struct sigframe32 __user *frame;
|
|
int err = 0;
|
|
|
|
frame = get_sigframe(ksig, regs, sizeof(*frame));
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
|
|
return -EFAULT;
|
|
|
|
err |= setup_sigcontext32(regs, &frame->sf_sc);
|
|
err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
|
|
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Arguments to signal handler:
|
|
*
|
|
* a0 = signal number
|
|
* a1 = 0 (should be cause)
|
|
* a2 = pointer to struct sigcontext
|
|
*
|
|
* $25 and c0_epc point to the signal handler, $29 points to the
|
|
* struct sigframe.
|
|
*/
|
|
regs->regs[ 4] = ksig->sig;
|
|
regs->regs[ 5] = 0;
|
|
regs->regs[ 6] = (unsigned long) &frame->sf_sc;
|
|
regs->regs[29] = (unsigned long) frame;
|
|
regs->regs[31] = (unsigned long) sig_return;
|
|
regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
|
|
|
|
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
|
|
current->comm, current->pid,
|
|
frame, regs->cp0_epc, regs->regs[31]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig,
|
|
struct pt_regs *regs, sigset_t *set)
|
|
{
|
|
struct rt_sigframe32 __user *frame;
|
|
int err = 0;
|
|
|
|
frame = get_sigframe(ksig, regs, sizeof(*frame));
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
|
|
return -EFAULT;
|
|
|
|
/* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
|
|
err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->rs_uc.uc_flags);
|
|
err |= __put_user(0, &frame->rs_uc.uc_link);
|
|
err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
|
|
err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
|
|
err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
|
|
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Arguments to signal handler:
|
|
*
|
|
* a0 = signal number
|
|
* a1 = 0 (should be cause)
|
|
* a2 = pointer to ucontext
|
|
*
|
|
* $25 and c0_epc point to the signal handler, $29 points to
|
|
* the struct rt_sigframe32.
|
|
*/
|
|
regs->regs[ 4] = ksig->sig;
|
|
regs->regs[ 5] = (unsigned long) &frame->rs_info;
|
|
regs->regs[ 6] = (unsigned long) &frame->rs_uc;
|
|
regs->regs[29] = (unsigned long) frame;
|
|
regs->regs[31] = (unsigned long) sig_return;
|
|
regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
|
|
|
|
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
|
|
current->comm, current->pid,
|
|
frame, regs->cp0_epc, regs->regs[31]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* o32 compatibility on 64-bit kernels, without DSP ASE
|
|
*/
|
|
struct mips_abi mips_abi_32 = {
|
|
.setup_frame = setup_frame_32,
|
|
.signal_return_offset =
|
|
offsetof(struct mips_vdso, o32_signal_trampoline),
|
|
.setup_rt_frame = setup_rt_frame_32,
|
|
.rt_signal_return_offset =
|
|
offsetof(struct mips_vdso, o32_rt_signal_trampoline),
|
|
.restart = __NR_O32_restart_syscall
|
|
};
|
|
|
|
static int signal32_init(void)
|
|
{
|
|
if (cpu_has_fpu) {
|
|
save_fp_context32 = _save_fp_context32;
|
|
restore_fp_context32 = _restore_fp_context32;
|
|
} else {
|
|
save_fp_context32 = copy_fp_to_sigcontext32;
|
|
restore_fp_context32 = copy_fp_from_sigcontext32;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(signal32_init);
|