mirror of https://gitee.com/openkylin/linux.git
454 lines
14 KiB
C
454 lines
14 KiB
C
/*
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* Copyright IBM Corp. 2000, 2006
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* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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* Gerhard Tonn (ton@de.ibm.com)
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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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*/
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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/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/tty.h>
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#include <linux/personality.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/lowcore.h>
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#include <asm/switch_to.h>
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#include "compat_linux.h"
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#include "compat_ptrace.h"
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#include "entry.h"
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typedef struct
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{
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__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
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struct sigcontext32 sc;
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_sigregs32 sregs;
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int signo;
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__u32 gprs_high[NUM_GPRS];
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__u8 retcode[S390_SYSCALL_SIZE];
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} sigframe32;
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typedef struct
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{
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__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
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__u8 retcode[S390_SYSCALL_SIZE];
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compat_siginfo_t info;
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struct ucontext32 uc;
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__u32 gprs_high[NUM_GPRS];
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} rt_sigframe32;
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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 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_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_int, &to->si_int);
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/* fallthrough */
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case __SI_KILL >> 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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break;
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case __SI_CHLD >> 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_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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break;
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case __SI_FAULT >> 16:
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err |= __put_user((unsigned long) from->si_addr,
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&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_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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default:
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break;
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}
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}
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return err ? -EFAULT : 0;
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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 tmp;
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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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if (to->si_code < 0)
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err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
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else {
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switch (to->si_code >> 16) {
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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 |= __get_user(to->si_int, &from->si_int);
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/* fallthrough */
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case __SI_KILL >> 16:
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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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break;
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case __SI_CHLD >> 16:
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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(to->si_utime, &from->si_utime);
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err |= __get_user(to->si_stime, &from->si_stime);
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err |= __get_user(to->si_status, &from->si_status);
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break;
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case __SI_FAULT >> 16:
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err |= __get_user(tmp, &from->si_addr);
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to->si_addr = (void __force __user *)
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(u64) (tmp & PSW32_ADDR_INSN);
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break;
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case __SI_POLL >> 16:
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err |= __get_user(to->si_band, &from->si_band);
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err |= __get_user(to->si_fd, &from->si_fd);
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break;
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case __SI_TIMER >> 16:
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err |= __get_user(to->si_tid, &from->si_tid);
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err |= __get_user(to->si_overrun, &from->si_overrun);
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err |= __get_user(to->si_int, &from->si_int);
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break;
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default:
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break;
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}
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}
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return err ? -EFAULT : 0;
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}
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static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
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{
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_sigregs32 user_sregs;
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int i;
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user_sregs.regs.psw.mask = (__u32)(regs->psw.mask >> 32);
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user_sregs.regs.psw.mask &= PSW32_MASK_USER | PSW32_MASK_RI;
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user_sregs.regs.psw.mask |= PSW32_USER_BITS;
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user_sregs.regs.psw.addr = (__u32) regs->psw.addr |
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(__u32)(regs->psw.mask & PSW_MASK_BA);
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for (i = 0; i < NUM_GPRS; i++)
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user_sregs.regs.gprs[i] = (__u32) regs->gprs[i];
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save_access_regs(current->thread.acrs);
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memcpy(&user_sregs.regs.acrs, current->thread.acrs,
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sizeof(user_sregs.regs.acrs));
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save_fp_ctl(¤t->thread.fp_regs.fpc);
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save_fp_regs(current->thread.fp_regs.fprs);
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memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs,
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sizeof(user_sregs.fpregs));
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if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs32)))
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return -EFAULT;
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return 0;
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}
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static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
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{
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_sigregs32 user_sregs;
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int i;
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/* Alwys make any pending restarted system call return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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if (__copy_from_user(&user_sregs, &sregs->regs, sizeof(user_sregs)))
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return -EFAULT;
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if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW32_MASK_RI))
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return -EINVAL;
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/* Loading the floating-point-control word can fail. Do that first. */
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if (restore_fp_ctl(&user_sregs.fpregs.fpc))
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return -EINVAL;
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/* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
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regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) |
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(__u64)(user_sregs.regs.psw.mask & PSW32_MASK_USER) << 32 |
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(__u64)(user_sregs.regs.psw.mask & PSW32_MASK_RI) << 32 |
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(__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_AMODE);
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/* Check for invalid user address space control. */
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if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
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regs->psw.mask = PSW_ASC_PRIMARY |
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(regs->psw.mask & ~PSW_MASK_ASC);
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regs->psw.addr = (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_INSN);
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for (i = 0; i < NUM_GPRS; i++)
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regs->gprs[i] = (__u64) user_sregs.regs.gprs[i];
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memcpy(¤t->thread.acrs, &user_sregs.regs.acrs,
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sizeof(current->thread.acrs));
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restore_access_regs(current->thread.acrs);
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memcpy(¤t->thread.fp_regs, &user_sregs.fpregs,
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sizeof(current->thread.fp_regs));
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restore_fp_regs(current->thread.fp_regs.fprs);
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clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
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return 0;
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}
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static int save_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
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{
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__u32 gprs_high[NUM_GPRS];
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int i;
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for (i = 0; i < NUM_GPRS; i++)
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gprs_high[i] = regs->gprs[i] >> 32;
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if (__copy_to_user(uregs, &gprs_high, sizeof(gprs_high)))
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return -EFAULT;
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return 0;
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}
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static int restore_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
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{
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__u32 gprs_high[NUM_GPRS];
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int i;
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if (__copy_from_user(&gprs_high, uregs, sizeof(gprs_high)))
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return -EFAULT;
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for (i = 0; i < NUM_GPRS; i++)
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*(__u32 *)®s->gprs[i] = gprs_high[i];
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return 0;
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}
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COMPAT_SYSCALL_DEFINE0(sigreturn)
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{
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struct pt_regs *regs = task_pt_regs(current);
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sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
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sigset_t set;
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if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
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goto badframe;
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set_current_blocked(&set);
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if (restore_sigregs32(regs, &frame->sregs))
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goto badframe;
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if (restore_sigregs_gprs_high(regs, frame->gprs_high))
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goto badframe;
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return regs->gprs[2];
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badframe:
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force_sig(SIGSEGV, current);
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return 0;
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}
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COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
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{
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struct pt_regs *regs = task_pt_regs(current);
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rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
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sigset_t set;
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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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set_current_blocked(&set);
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if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
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goto badframe;
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if (restore_sigregs_gprs_high(regs, frame->gprs_high))
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goto badframe;
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if (compat_restore_altstack(&frame->uc.uc_stack))
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goto badframe;
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return regs->gprs[2];
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badframe:
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force_sig(SIGSEGV, current);
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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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/*
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* Determine which stack to use..
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*/
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static inline 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 sp;
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/* Default to using normal stack */
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sp = (unsigned long) A(regs->gprs[15]);
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/* Overflow on alternate signal stack gives SIGSEGV. */
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if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
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return (void __user *) -1UL;
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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(sp))
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sp = current->sas_ss_sp + current->sas_ss_size;
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}
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return (void __user *)((sp - frame_size) & -8ul);
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}
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static inline int map_signal(int sig)
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{
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if (current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32)
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return current_thread_info()->exec_domain->signal_invmap[sig];
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else
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return sig;
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}
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static int setup_frame32(struct ksignal *ksig, sigset_t *set,
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struct pt_regs *regs)
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{
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int sig = ksig->sig;
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sigframe32 __user *frame = get_sigframe(&ksig->ka, regs, sizeof(sigframe32));
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if (frame == (void __user *) -1UL)
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return -EFAULT;
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if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
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return -EFAULT;
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if (save_sigregs32(regs, &frame->sregs))
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return -EFAULT;
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if (save_sigregs_gprs_high(regs, frame->gprs_high))
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return -EFAULT;
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if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
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return -EFAULT;
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/* Set up to return from userspace. If provided, use a stub
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already in userspace. */
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if (ksig->ka.sa.sa_flags & SA_RESTORER) {
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regs->gprs[14] = (__u64 __force) ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
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} else {
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regs->gprs[14] = (__u64 __force) frame->retcode | PSW32_ADDR_AMODE;
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if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
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(u16 __force __user *)(frame->retcode)))
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return -EFAULT;
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}
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/* Set up backchain. */
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if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
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return -EFAULT;
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/* Set up registers for signal handler */
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regs->gprs[15] = (__force __u64) frame;
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/* Force 31 bit amode and default user address space control. */
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regs->psw.mask = PSW_MASK_BA |
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(PSW_USER_BITS & PSW_MASK_ASC) |
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(regs->psw.mask & ~PSW_MASK_ASC);
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regs->psw.addr = (__force __u64) ksig->ka.sa.sa_handler;
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regs->gprs[2] = map_signal(sig);
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regs->gprs[3] = (__force __u64) &frame->sc;
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/* We forgot to include these in the sigcontext.
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To avoid breaking binary compatibility, they are passed as args. */
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if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
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sig == SIGTRAP || sig == SIGFPE) {
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/* set extra registers only for synchronous signals */
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regs->gprs[4] = regs->int_code & 127;
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regs->gprs[5] = regs->int_parm_long;
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regs->gprs[6] = task_thread_info(current)->last_break;
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}
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/* Place signal number on stack to allow backtrace from handler. */
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if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))
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return -EFAULT;
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return 0;
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}
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static int setup_rt_frame32(struct ksignal *ksig, sigset_t *set,
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struct pt_regs *regs)
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{
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int err = 0;
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rt_sigframe32 __user *frame = get_sigframe(&ksig->ka, regs, sizeof(rt_sigframe32));
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if (frame == (void __user *) -1UL)
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return -EFAULT;
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if (copy_siginfo_to_user32(&frame->info, &ksig->info))
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return -EFAULT;
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/* Create the ucontext. */
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err |= __put_user(UC_EXTENDED, &frame->uc.uc_flags);
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err |= __put_user(0, &frame->uc.uc_link);
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err |= __compat_save_altstack(&frame->uc.uc_stack, regs->gprs[15]);
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err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
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err |= save_sigregs_gprs_high(regs, frame->gprs_high);
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err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
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if (err)
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return -EFAULT;
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/* Set up to return from userspace. If provided, use a stub
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already in userspace. */
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if (ksig->ka.sa.sa_flags & SA_RESTORER) {
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regs->gprs[14] = (__u64 __force) ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
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} else {
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regs->gprs[14] = (__u64 __force) frame->retcode | PSW32_ADDR_AMODE;
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if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
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(u16 __force __user *)(frame->retcode)))
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return -EFAULT;
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}
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/* Set up backchain. */
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if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame))
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return -EFAULT;
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/* Set up registers for signal handler */
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regs->gprs[15] = (__force __u64) frame;
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/* Force 31 bit amode and default user address space control. */
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regs->psw.mask = PSW_MASK_BA |
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(PSW_USER_BITS & PSW_MASK_ASC) |
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(regs->psw.mask & ~PSW_MASK_ASC);
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regs->psw.addr = (__u64 __force) ksig->ka.sa.sa_handler;
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regs->gprs[2] = map_signal(ksig->sig);
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regs->gprs[3] = (__force __u64) &frame->info;
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regs->gprs[4] = (__force __u64) &frame->uc;
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regs->gprs[5] = task_thread_info(current)->last_break;
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return 0;
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}
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|
|
/*
|
|
* OK, we're invoking a handler
|
|
*/
|
|
|
|
void handle_signal32(struct ksignal *ksig, sigset_t *oldset,
|
|
struct pt_regs *regs)
|
|
{
|
|
int ret;
|
|
|
|
/* Set up the stack frame */
|
|
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
|
|
ret = setup_rt_frame32(ksig, oldset, regs);
|
|
else
|
|
ret = setup_frame32(ksig, oldset, regs);
|
|
|
|
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLE_STEP));
|
|
}
|
|
|