| /* |
| * Copyright IBM Corp. 2000, 2006 |
| * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
| * Gerhard Tonn (ton@de.ibm.com) |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * |
| * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| */ |
| |
| #include <linux/compat.h> |
| #include <linux/sched.h> |
| #include <linux/mm.h> |
| #include <linux/smp.h> |
| #include <linux/kernel.h> |
| #include <linux/signal.h> |
| #include <linux/errno.h> |
| #include <linux/wait.h> |
| #include <linux/ptrace.h> |
| #include <linux/unistd.h> |
| #include <linux/stddef.h> |
| #include <linux/tty.h> |
| #include <linux/personality.h> |
| #include <linux/binfmts.h> |
| #include <asm/ucontext.h> |
| #include <asm/uaccess.h> |
| #include <asm/lowcore.h> |
| #include <asm/switch_to.h> |
| #include "compat_linux.h" |
| #include "compat_ptrace.h" |
| #include "entry.h" |
| |
| typedef struct |
| { |
| __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; |
| struct sigcontext32 sc; |
| _sigregs32 sregs; |
| int signo; |
| __u32 gprs_high[NUM_GPRS]; |
| __u8 retcode[S390_SYSCALL_SIZE]; |
| } sigframe32; |
| |
| typedef struct |
| { |
| __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; |
| __u8 retcode[S390_SYSCALL_SIZE]; |
| compat_siginfo_t info; |
| struct ucontext32 uc; |
| __u32 gprs_high[NUM_GPRS]; |
| } rt_sigframe32; |
| |
| int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) |
| { |
| int err; |
| |
| /* If you change siginfo_t structure, please be sure |
| this code is fixed accordingly. |
| It should never copy any pad contained in the structure |
| to avoid security leaks, but must copy the generic |
| 3 ints plus the relevant union member. |
| This routine must convert siginfo from 64bit to 32bit as well |
| at the same time. */ |
| err = __put_user(from->si_signo, &to->si_signo); |
| err |= __put_user(from->si_errno, &to->si_errno); |
| err |= __put_user((short)from->si_code, &to->si_code); |
| if (from->si_code < 0) |
| err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); |
| else { |
| switch (from->si_code >> 16) { |
| case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
| case __SI_MESGQ >> 16: |
| err |= __put_user(from->si_int, &to->si_int); |
| /* fallthrough */ |
| case __SI_KILL >> 16: |
| err |= __put_user(from->si_pid, &to->si_pid); |
| err |= __put_user(from->si_uid, &to->si_uid); |
| break; |
| case __SI_CHLD >> 16: |
| err |= __put_user(from->si_pid, &to->si_pid); |
| err |= __put_user(from->si_uid, &to->si_uid); |
| err |= __put_user(from->si_utime, &to->si_utime); |
| err |= __put_user(from->si_stime, &to->si_stime); |
| err |= __put_user(from->si_status, &to->si_status); |
| break; |
| case __SI_FAULT >> 16: |
| err |= __put_user((unsigned long) from->si_addr, |
| &to->si_addr); |
| break; |
| case __SI_POLL >> 16: |
| err |= __put_user(from->si_band, &to->si_band); |
| err |= __put_user(from->si_fd, &to->si_fd); |
| break; |
| case __SI_TIMER >> 16: |
| err |= __put_user(from->si_tid, &to->si_tid); |
| err |= __put_user(from->si_overrun, &to->si_overrun); |
| err |= __put_user(from->si_int, &to->si_int); |
| break; |
| default: |
| break; |
| } |
| } |
| return err ? -EFAULT : 0; |
| } |
| |
| int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) |
| { |
| int err; |
| u32 tmp; |
| |
| err = __get_user(to->si_signo, &from->si_signo); |
| err |= __get_user(to->si_errno, &from->si_errno); |
| err |= __get_user(to->si_code, &from->si_code); |
| |
| if (to->si_code < 0) |
| err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); |
| else { |
| switch (to->si_code >> 16) { |
| case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
| case __SI_MESGQ >> 16: |
| err |= __get_user(to->si_int, &from->si_int); |
| /* fallthrough */ |
| case __SI_KILL >> 16: |
| err |= __get_user(to->si_pid, &from->si_pid); |
| err |= __get_user(to->si_uid, &from->si_uid); |
| break; |
| case __SI_CHLD >> 16: |
| err |= __get_user(to->si_pid, &from->si_pid); |
| err |= __get_user(to->si_uid, &from->si_uid); |
| err |= __get_user(to->si_utime, &from->si_utime); |
| err |= __get_user(to->si_stime, &from->si_stime); |
| err |= __get_user(to->si_status, &from->si_status); |
| break; |
| case __SI_FAULT >> 16: |
| err |= __get_user(tmp, &from->si_addr); |
| to->si_addr = (void __force __user *) |
| (u64) (tmp & PSW32_ADDR_INSN); |
| break; |
| case __SI_POLL >> 16: |
| err |= __get_user(to->si_band, &from->si_band); |
| err |= __get_user(to->si_fd, &from->si_fd); |
| break; |
| case __SI_TIMER >> 16: |
| err |= __get_user(to->si_tid, &from->si_tid); |
| err |= __get_user(to->si_overrun, &from->si_overrun); |
| err |= __get_user(to->si_int, &from->si_int); |
| break; |
| default: |
| break; |
| } |
| } |
| return err ? -EFAULT : 0; |
| } |
| |
| static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs) |
| { |
| _sigregs32 user_sregs; |
| int i; |
| |
| user_sregs.regs.psw.mask = (__u32)(regs->psw.mask >> 32); |
| user_sregs.regs.psw.mask &= PSW32_MASK_USER | PSW32_MASK_RI; |
| user_sregs.regs.psw.mask |= PSW32_USER_BITS; |
| user_sregs.regs.psw.addr = (__u32) regs->psw.addr | |
| (__u32)(regs->psw.mask & PSW_MASK_BA); |
| for (i = 0; i < NUM_GPRS; i++) |
| user_sregs.regs.gprs[i] = (__u32) regs->gprs[i]; |
| save_access_regs(current->thread.acrs); |
| memcpy(&user_sregs.regs.acrs, current->thread.acrs, |
| sizeof(user_sregs.regs.acrs)); |
| save_fp_ctl(¤t->thread.fp_regs.fpc); |
| save_fp_regs(current->thread.fp_regs.fprs); |
| memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, |
| sizeof(user_sregs.fpregs)); |
| if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs32))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs) |
| { |
| _sigregs32 user_sregs; |
| int i; |
| |
| /* Alwys make any pending restarted system call return -EINTR */ |
| current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| |
| if (__copy_from_user(&user_sregs, &sregs->regs, sizeof(user_sregs))) |
| return -EFAULT; |
| |
| if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW32_MASK_RI)) |
| return -EINVAL; |
| |
| /* Loading the floating-point-control word can fail. Do that first. */ |
| if (restore_fp_ctl(&user_sregs.fpregs.fpc)) |
| return -EINVAL; |
| |
| /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */ |
| regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) | |
| (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_USER) << 32 | |
| (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_RI) << 32 | |
| (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_AMODE); |
| /* Check for invalid user address space control. */ |
| if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME) |
| regs->psw.mask = PSW_ASC_PRIMARY | |
| (regs->psw.mask & ~PSW_MASK_ASC); |
| regs->psw.addr = (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_INSN); |
| for (i = 0; i < NUM_GPRS; i++) |
| regs->gprs[i] = (__u64) user_sregs.regs.gprs[i]; |
| memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, |
| sizeof(current->thread.acrs)); |
| restore_access_regs(current->thread.acrs); |
| |
| memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
| sizeof(current->thread.fp_regs)); |
| |
| restore_fp_regs(current->thread.fp_regs.fprs); |
| clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */ |
| return 0; |
| } |
| |
| static int save_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs) |
| { |
| __u32 gprs_high[NUM_GPRS]; |
| int i; |
| |
| for (i = 0; i < NUM_GPRS; i++) |
| gprs_high[i] = regs->gprs[i] >> 32; |
| if (__copy_to_user(uregs, &gprs_high, sizeof(gprs_high))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int restore_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs) |
| { |
| __u32 gprs_high[NUM_GPRS]; |
| int i; |
| |
| if (__copy_from_user(&gprs_high, uregs, sizeof(gprs_high))) |
| return -EFAULT; |
| for (i = 0; i < NUM_GPRS; i++) |
| *(__u32 *)®s->gprs[i] = gprs_high[i]; |
| return 0; |
| } |
| |
| asmlinkage long sys32_sigreturn(void) |
| { |
| struct pt_regs *regs = task_pt_regs(current); |
| sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15]; |
| sigset_t set; |
| |
| if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32)) |
| goto badframe; |
| set_current_blocked(&set); |
| if (restore_sigregs32(regs, &frame->sregs)) |
| goto badframe; |
| if (restore_sigregs_gprs_high(regs, frame->gprs_high)) |
| goto badframe; |
| return regs->gprs[2]; |
| badframe: |
| force_sig(SIGSEGV, current); |
| return 0; |
| } |
| |
| asmlinkage long sys32_rt_sigreturn(void) |
| { |
| struct pt_regs *regs = task_pt_regs(current); |
| rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15]; |
| sigset_t set; |
| |
| if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| goto badframe; |
| set_current_blocked(&set); |
| if (restore_sigregs32(regs, &frame->uc.uc_mcontext)) |
| goto badframe; |
| if (restore_sigregs_gprs_high(regs, frame->gprs_high)) |
| goto badframe; |
| if (compat_restore_altstack(&frame->uc.uc_stack)) |
| goto badframe; |
| return regs->gprs[2]; |
| badframe: |
| force_sig(SIGSEGV, current); |
| return 0; |
| } |
| |
| /* |
| * Set up a signal frame. |
| */ |
| |
| |
| /* |
| * Determine which stack to use.. |
| */ |
| static inline void __user * |
| get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) |
| { |
| unsigned long sp; |
| |
| /* Default to using normal stack */ |
| sp = (unsigned long) A(regs->gprs[15]); |
| |
| /* Overflow on alternate signal stack gives SIGSEGV. */ |
| if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) |
| return (void __user *) -1UL; |
| |
| /* This is the X/Open sanctioned signal stack switching. */ |
| if (ka->sa.sa_flags & SA_ONSTACK) { |
| if (! sas_ss_flags(sp)) |
| sp = current->sas_ss_sp + current->sas_ss_size; |
| } |
| |
| return (void __user *)((sp - frame_size) & -8ul); |
| } |
| |
| static inline int map_signal(int sig) |
| { |
| if (current_thread_info()->exec_domain |
| && current_thread_info()->exec_domain->signal_invmap |
| && sig < 32) |
| return current_thread_info()->exec_domain->signal_invmap[sig]; |
| else |
| return sig; |
| } |
| |
| static int setup_frame32(int sig, struct k_sigaction *ka, |
| sigset_t *set, struct pt_regs * regs) |
| { |
| sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32)); |
| |
| if (frame == (void __user *) -1UL) |
| goto give_sigsegv; |
| |
| if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32)) |
| goto give_sigsegv; |
| |
| if (save_sigregs32(regs, &frame->sregs)) |
| goto give_sigsegv; |
| if (save_sigregs_gprs_high(regs, frame->gprs_high)) |
| goto give_sigsegv; |
| if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs)) |
| goto give_sigsegv; |
| |
| /* Set up to return from userspace. If provided, use a stub |
| already in userspace. */ |
| if (ka->sa.sa_flags & SA_RESTORER) { |
| regs->gprs[14] = (__u64 __force) ka->sa.sa_restorer | PSW32_ADDR_AMODE; |
| } else { |
| regs->gprs[14] = (__u64 __force) frame->retcode | PSW32_ADDR_AMODE; |
| if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, |
| (u16 __force __user *)(frame->retcode))) |
| goto give_sigsegv; |
| } |
| |
| /* Set up backchain. */ |
| if (__put_user(regs->gprs[15], (unsigned int __user *) frame)) |
| goto give_sigsegv; |
| |
| /* Set up registers for signal handler */ |
| regs->gprs[15] = (__force __u64) frame; |
| /* Force 31 bit amode and default user address space control. */ |
| regs->psw.mask = PSW_MASK_BA | |
| (PSW_USER_BITS & PSW_MASK_ASC) | |
| (regs->psw.mask & ~PSW_MASK_ASC); |
| regs->psw.addr = (__force __u64) ka->sa.sa_handler; |
| |
| regs->gprs[2] = map_signal(sig); |
| regs->gprs[3] = (__force __u64) &frame->sc; |
| |
| /* We forgot to include these in the sigcontext. |
| To avoid breaking binary compatibility, they are passed as args. */ |
| if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || |
| sig == SIGTRAP || sig == SIGFPE) { |
| /* set extra registers only for synchronous signals */ |
| regs->gprs[4] = regs->int_code & 127; |
| regs->gprs[5] = regs->int_parm_long; |
| regs->gprs[6] = task_thread_info(current)->last_break; |
| } |
| |
| /* Place signal number on stack to allow backtrace from handler. */ |
| if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo)) |
| goto give_sigsegv; |
| return 0; |
| |
| give_sigsegv: |
| force_sigsegv(sig, current); |
| return -EFAULT; |
| } |
| |
| static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info, |
| sigset_t *set, struct pt_regs * regs) |
| { |
| int err = 0; |
| rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32)); |
| |
| if (frame == (void __user *) -1UL) |
| goto give_sigsegv; |
| |
| if (copy_siginfo_to_user32(&frame->info, info)) |
| goto give_sigsegv; |
| |
| /* Create the ucontext. */ |
| err |= __put_user(UC_EXTENDED, &frame->uc.uc_flags); |
| err |= __put_user(0, &frame->uc.uc_link); |
| err |= __compat_save_altstack(&frame->uc.uc_stack, regs->gprs[15]); |
| err |= save_sigregs32(regs, &frame->uc.uc_mcontext); |
| err |= save_sigregs_gprs_high(regs, frame->gprs_high); |
| err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| if (err) |
| goto give_sigsegv; |
| |
| /* Set up to return from userspace. If provided, use a stub |
| already in userspace. */ |
| if (ka->sa.sa_flags & SA_RESTORER) { |
| regs->gprs[14] = (__u64 __force) ka->sa.sa_restorer | PSW32_ADDR_AMODE; |
| } else { |
| regs->gprs[14] = (__u64 __force) frame->retcode | PSW32_ADDR_AMODE; |
| err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
| (u16 __force __user *)(frame->retcode)); |
| } |
| |
| /* Set up backchain. */ |
| if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame)) |
| goto give_sigsegv; |
| |
| /* Set up registers for signal handler */ |
| regs->gprs[15] = (__force __u64) frame; |
| /* Force 31 bit amode and default user address space control. */ |
| regs->psw.mask = PSW_MASK_BA | |
| (PSW_USER_BITS & PSW_MASK_ASC) | |
| (regs->psw.mask & ~PSW_MASK_ASC); |
| regs->psw.addr = (__u64 __force) ka->sa.sa_handler; |
| |
| regs->gprs[2] = map_signal(sig); |
| regs->gprs[3] = (__force __u64) &frame->info; |
| regs->gprs[4] = (__force __u64) &frame->uc; |
| regs->gprs[5] = task_thread_info(current)->last_break; |
| return 0; |
| |
| give_sigsegv: |
| force_sigsegv(sig, current); |
| return -EFAULT; |
| } |
| |
| /* |
| * OK, we're invoking a handler |
| */ |
| |
| void handle_signal32(unsigned long sig, struct k_sigaction *ka, |
| siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) |
| { |
| int ret; |
| |
| /* Set up the stack frame */ |
| if (ka->sa.sa_flags & SA_SIGINFO) |
| ret = setup_rt_frame32(sig, ka, info, oldset, regs); |
| else |
| ret = setup_frame32(sig, ka, oldset, regs); |
| if (ret) |
| return; |
| signal_delivered(sig, info, ka, regs, |
| test_thread_flag(TIF_SINGLE_STEP)); |
| } |
| |