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617 lines
16 KiB
617 lines
16 KiB
/*
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* linux/arch/x86_64/ia32/ia32_signal.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
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* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
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* 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen
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*/
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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/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/personality.h>
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#include <linux/compat.h>
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#include <linux/binfmts.h>
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#include <asm/ucontext.h>
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#include <asm/uaccess.h>
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#include <asm/i387.h>
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#include <asm/ia32.h>
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#include <asm/ptrace.h>
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#include <asm/ia32_unistd.h>
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#include <asm/user32.h>
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#include <asm/sigcontext32.h>
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#include <asm/fpu32.h>
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#include <asm/proto.h>
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#include <asm/vsyscall32.h>
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#define DEBUG_SIG 0
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
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void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
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int copy_siginfo_to_user32(compat_siginfo_t __user *to, 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 make sure that
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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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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 |= __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(ptr_to_compat(from->si_ptr), &to->si_ptr);
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} else {
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/* First 32bits of unions are always present:
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* si_pid === si_band === si_tid === si_addr(LS half) */
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err |= __put_user(from->_sifields._pad[0], &to->_sifields._pad[0]);
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switch (from->si_code >> 16) {
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case __SI_FAULT >> 16:
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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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/* FALL THROUGH */
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default:
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case __SI_KILL >> 16:
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err |= __put_user(from->si_uid, &to->si_uid);
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break;
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case __SI_POLL >> 16:
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err |= __put_user(from->si_fd, &to->si_fd);
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break;
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case __SI_TIMER >> 16:
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err |= __put_user(from->si_overrun, &to->si_overrun);
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err |= __put_user(ptr_to_compat(from->si_ptr),
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&to->si_ptr);
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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_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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int err;
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u32 ptr32;
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if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
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return -EFAULT;
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err = __get_user(to->si_signo, &from->si_signo);
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err |= __get_user(to->si_errno, &from->si_errno);
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err |= __get_user(to->si_code, &from->si_code);
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err |= __get_user(to->si_pid, &from->si_pid);
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err |= __get_user(to->si_uid, &from->si_uid);
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err |= __get_user(ptr32, &from->si_ptr);
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to->si_ptr = compat_ptr(ptr32);
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return err;
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}
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asmlinkage long
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sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
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{
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mask &= _BLOCKABLE;
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spin_lock_irq(¤t->sighand->siglock);
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current->saved_sigmask = current->blocked;
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siginitset(¤t->blocked, mask);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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set_thread_flag(TIF_RESTORE_SIGMASK);
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return -ERESTARTNOHAND;
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}
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asmlinkage long
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sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
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stack_ia32_t __user *uoss_ptr,
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struct pt_regs *regs)
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{
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stack_t uss,uoss;
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int ret;
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mm_segment_t seg;
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if (uss_ptr) {
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u32 ptr;
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memset(&uss,0,sizeof(stack_t));
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if (!access_ok(VERIFY_READ,uss_ptr,sizeof(stack_ia32_t)) ||
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__get_user(ptr, &uss_ptr->ss_sp) ||
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__get_user(uss.ss_flags, &uss_ptr->ss_flags) ||
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__get_user(uss.ss_size, &uss_ptr->ss_size))
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return -EFAULT;
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uss.ss_sp = compat_ptr(ptr);
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}
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seg = get_fs();
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set_fs(KERNEL_DS);
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ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->rsp);
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set_fs(seg);
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if (ret >= 0 && uoss_ptr) {
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if (!access_ok(VERIFY_WRITE,uoss_ptr,sizeof(stack_ia32_t)) ||
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__put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) ||
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__put_user(uoss.ss_flags, &uoss_ptr->ss_flags) ||
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__put_user(uoss.ss_size, &uoss_ptr->ss_size))
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ret = -EFAULT;
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}
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return ret;
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}
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/*
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* Do a signal return; undo the signal stack.
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*/
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struct sigframe
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{
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u32 pretcode;
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int sig;
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struct sigcontext_ia32 sc;
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struct _fpstate_ia32 fpstate;
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unsigned int extramask[_COMPAT_NSIG_WORDS-1];
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char retcode[8];
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};
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struct rt_sigframe
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{
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u32 pretcode;
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int sig;
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u32 pinfo;
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u32 puc;
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compat_siginfo_t info;
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struct ucontext_ia32 uc;
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struct _fpstate_ia32 fpstate;
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char retcode[8];
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};
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static int
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ia32_restore_sigcontext(struct pt_regs *regs, struct sigcontext_ia32 __user *sc, unsigned int *peax)
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{
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unsigned int err = 0;
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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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#if DEBUG_SIG
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printk("SIG restore_sigcontext: sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n",
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sc, sc->err, sc->eip, sc->cs, sc->eflags);
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#endif
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#define COPY(x) { \
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unsigned int reg; \
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err |= __get_user(reg, &sc->e ##x); \
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regs->r ## x = reg; \
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}
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#define RELOAD_SEG(seg,mask) \
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{ unsigned int cur; \
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unsigned short pre; \
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err |= __get_user(pre, &sc->seg); \
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asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \
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pre |= mask; \
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if (pre != cur) loadsegment(seg,pre); }
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/* Reload fs and gs if they have changed in the signal handler.
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This does not handle long fs/gs base changes in the handler, but
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does not clobber them at least in the normal case. */
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{
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unsigned gs, oldgs;
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err |= __get_user(gs, &sc->gs);
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gs |= 3;
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asm("movl %%gs,%0" : "=r" (oldgs));
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if (gs != oldgs)
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load_gs_index(gs);
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}
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RELOAD_SEG(fs,3);
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RELOAD_SEG(ds,3);
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RELOAD_SEG(es,3);
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COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
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COPY(dx); COPY(cx); COPY(ip);
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/* Don't touch extended registers */
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err |= __get_user(regs->cs, &sc->cs);
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regs->cs |= 3;
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err |= __get_user(regs->ss, &sc->ss);
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regs->ss |= 3;
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{
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unsigned int tmpflags;
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err |= __get_user(tmpflags, &sc->eflags);
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regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
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regs->orig_rax = -1; /* disable syscall checks */
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}
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{
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u32 tmp;
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struct _fpstate_ia32 __user * buf;
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err |= __get_user(tmp, &sc->fpstate);
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buf = compat_ptr(tmp);
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if (buf) {
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if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
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goto badframe;
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err |= restore_i387_ia32(current, buf, 0);
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} else {
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struct task_struct *me = current;
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if (used_math()) {
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clear_fpu(me);
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clear_used_math();
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}
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}
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}
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{
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u32 tmp;
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err |= __get_user(tmp, &sc->eax);
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*peax = tmp;
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}
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return err;
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badframe:
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return 1;
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}
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asmlinkage long sys32_sigreturn(struct pt_regs *regs)
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{
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struct sigframe __user *frame = (struct sigframe __user *)(regs->rsp-8);
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sigset_t set;
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unsigned int eax;
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__get_user(set.sig[0], &frame->sc.oldmask)
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|| (_COMPAT_NSIG_WORDS > 1
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&& __copy_from_user((((char *) &set.sig) + 4), &frame->extramask,
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sizeof(frame->extramask))))
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goto badframe;
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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if (ia32_restore_sigcontext(regs, &frame->sc, &eax))
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goto badframe;
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return eax;
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badframe:
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signal_fault(regs, frame, "32bit sigreturn");
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return 0;
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}
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asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
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{
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struct rt_sigframe __user *frame;
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sigset_t set;
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unsigned int eax;
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struct pt_regs tregs;
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frame = (struct rt_sigframe __user *)(regs->rsp - 4);
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
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goto badframe;
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
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goto badframe;
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tregs = *regs;
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if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
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goto badframe;
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return eax;
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badframe:
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signal_fault(regs,frame,"32bit rt sigreturn");
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return 0;
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}
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/*
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* Set up a signal frame.
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*/
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static int
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ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate,
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struct pt_regs *regs, unsigned int mask)
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{
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int tmp, err = 0;
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tmp = 0;
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__asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
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err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
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__asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
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err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
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__asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp));
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err |= __put_user(tmp, (unsigned int __user *)&sc->ds);
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__asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp));
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err |= __put_user(tmp, (unsigned int __user *)&sc->es);
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err |= __put_user((u32)regs->rdi, &sc->edi);
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err |= __put_user((u32)regs->rsi, &sc->esi);
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err |= __put_user((u32)regs->rbp, &sc->ebp);
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err |= __put_user((u32)regs->rsp, &sc->esp);
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err |= __put_user((u32)regs->rbx, &sc->ebx);
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err |= __put_user((u32)regs->rdx, &sc->edx);
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err |= __put_user((u32)regs->rcx, &sc->ecx);
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err |= __put_user((u32)regs->rax, &sc->eax);
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err |= __put_user((u32)regs->cs, &sc->cs);
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err |= __put_user((u32)regs->ss, &sc->ss);
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err |= __put_user(current->thread.trap_no, &sc->trapno);
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err |= __put_user(current->thread.error_code, &sc->err);
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err |= __put_user((u32)regs->rip, &sc->eip);
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err |= __put_user((u32)regs->eflags, &sc->eflags);
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err |= __put_user((u32)regs->rsp, &sc->esp_at_signal);
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tmp = save_i387_ia32(current, fpstate, regs, 0);
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if (tmp < 0)
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err = -EFAULT;
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else {
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clear_used_math();
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stts();
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err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL),
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&sc->fpstate);
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}
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/* non-iBCS2 extensions.. */
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err |= __put_user(mask, &sc->oldmask);
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err |= __put_user(current->thread.cr2, &sc->cr2);
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return err;
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}
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/*
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* Determine which stack to use..
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*/
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static void __user *
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get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
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{
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unsigned long rsp;
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/* Default to using normal stack */
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rsp = regs->rsp;
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa.sa_flags & SA_ONSTACK) {
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if (sas_ss_flags(rsp) == 0)
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rsp = current->sas_ss_sp + current->sas_ss_size;
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}
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/* This is the legacy signal stack switching. */
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else if ((regs->ss & 0xffff) != __USER_DS &&
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!(ka->sa.sa_flags & SA_RESTORER) &&
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ka->sa.sa_restorer) {
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rsp = (unsigned long) ka->sa.sa_restorer;
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}
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rsp -= frame_size;
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/* Align the stack pointer according to the i386 ABI,
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* i.e. so that on function entry ((sp + 4) & 15) == 0. */
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rsp = ((rsp + 4) & -16ul) - 4;
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return (void __user *) rsp;
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}
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int ia32_setup_frame(int sig, struct k_sigaction *ka,
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compat_sigset_t *set, struct pt_regs * regs)
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{
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struct sigframe __user *frame;
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int err = 0;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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goto give_sigsegv;
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err |= __put_user(sig, &frame->sig);
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if (err)
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goto give_sigsegv;
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err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs,
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set->sig[0]);
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if (err)
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goto give_sigsegv;
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if (_COMPAT_NSIG_WORDS > 1) {
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err |= __copy_to_user(frame->extramask, &set->sig[1],
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sizeof(frame->extramask));
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}
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if (err)
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goto give_sigsegv;
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/* Return stub is in 32bit vsyscall page */
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{
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void __user *restorer;
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if (current->binfmt->hasvdso)
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restorer = VSYSCALL32_SIGRETURN;
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else
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restorer = (void *)&frame->retcode;
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if (ka->sa.sa_flags & SA_RESTORER)
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restorer = ka->sa.sa_restorer;
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err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
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}
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/* These are actually not used anymore, but left because some
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gdb versions depend on them as a marker. */
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{
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/* copy_to_user optimizes that into a single 8 byte store */
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static const struct {
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u16 poplmovl;
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u32 val;
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u16 int80;
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u16 pad;
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} __attribute__((packed)) code = {
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0xb858, /* popl %eax ; movl $...,%eax */
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__NR_ia32_sigreturn,
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0x80cd, /* int $0x80 */
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0,
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};
|
|
err |= __copy_to_user(frame->retcode, &code, 8);
|
|
}
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up registers for signal handler */
|
|
regs->rsp = (unsigned long) frame;
|
|
regs->rip = (unsigned long) ka->sa.sa_handler;
|
|
|
|
/* Make -mregparm=3 work */
|
|
regs->rax = sig;
|
|
regs->rdx = 0;
|
|
regs->rcx = 0;
|
|
|
|
asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
|
|
asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
|
|
|
|
regs->cs = __USER32_CS;
|
|
regs->ss = __USER32_DS;
|
|
|
|
set_fs(USER_DS);
|
|
regs->eflags &= ~TF_MASK;
|
|
if (test_thread_flag(TIF_SINGLESTEP))
|
|
ptrace_notify(SIGTRAP);
|
|
|
|
#if DEBUG_SIG
|
|
printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n",
|
|
current->comm, current->pid, frame, regs->rip, frame->pretcode);
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(sig, current);
|
|
return -EFAULT;
|
|
}
|
|
|
|
int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
compat_sigset_t *set, struct pt_regs * regs)
|
|
{
|
|
struct rt_sigframe __user *frame;
|
|
int err = 0;
|
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
goto give_sigsegv;
|
|
|
|
{
|
|
struct exec_domain *ed = current_thread_info()->exec_domain;
|
|
err |= __put_user((ed
|
|
&& ed->signal_invmap
|
|
&& sig < 32
|
|
? ed->signal_invmap[sig]
|
|
: sig),
|
|
&frame->sig);
|
|
}
|
|
err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo);
|
|
err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc);
|
|
err |= copy_siginfo_to_user32(&frame->info, info);
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->uc.uc_flags);
|
|
err |= __put_user(0, &frame->uc.uc_link);
|
|
err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
|
err |= __put_user(sas_ss_flags(regs->rsp),
|
|
&frame->uc.uc_stack.ss_flags);
|
|
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
|
err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
|
|
regs, set->sig[0]);
|
|
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
|
|
{
|
|
void __user *restorer = VSYSCALL32_RTSIGRETURN;
|
|
if (ka->sa.sa_flags & SA_RESTORER)
|
|
restorer = ka->sa.sa_restorer;
|
|
err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
|
|
}
|
|
|
|
/* This is movl $,%eax ; int $0x80 */
|
|
/* Not actually used anymore, but left because some gdb versions
|
|
need it. */
|
|
{
|
|
/* __copy_to_user optimizes that into a single 8 byte store */
|
|
static const struct {
|
|
u8 movl;
|
|
u32 val;
|
|
u16 int80;
|
|
u16 pad;
|
|
u8 pad2;
|
|
} __attribute__((packed)) code = {
|
|
0xb8,
|
|
__NR_ia32_rt_sigreturn,
|
|
0x80cd,
|
|
0,
|
|
};
|
|
err |= __copy_to_user(frame->retcode, &code, 8);
|
|
}
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up registers for signal handler */
|
|
regs->rsp = (unsigned long) frame;
|
|
regs->rip = (unsigned long) ka->sa.sa_handler;
|
|
|
|
/* Make -mregparm=3 work */
|
|
regs->rax = sig;
|
|
regs->rdx = (unsigned long) &frame->info;
|
|
regs->rcx = (unsigned long) &frame->uc;
|
|
|
|
/* Make -mregparm=3 work */
|
|
regs->rax = sig;
|
|
regs->rdx = (unsigned long) &frame->info;
|
|
regs->rcx = (unsigned long) &frame->uc;
|
|
|
|
asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
|
|
asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
|
|
|
|
regs->cs = __USER32_CS;
|
|
regs->ss = __USER32_DS;
|
|
|
|
set_fs(USER_DS);
|
|
regs->eflags &= ~TF_MASK;
|
|
if (test_thread_flag(TIF_SINGLESTEP))
|
|
ptrace_notify(SIGTRAP);
|
|
|
|
#if DEBUG_SIG
|
|
printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n",
|
|
current->comm, current->pid, frame, regs->rip, frame->pretcode);
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(sig, current);
|
|
return -EFAULT;
|
|
}
|
|
|