X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fs390%2Fkernel%2Fcompat_signal.c;h=2bbe78a2f4b6291d969a60f8c7452cdb761f0596;hb=refs%2Fheads%2Fvserver;hp=3886a27b8e4de4e4823eeed0cba85ba8844d244d;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c index 3886a27b8..2bbe78a2f 100644 --- a/arch/s390/kernel/compat_signal.c +++ b/arch/s390/kernel/compat_signal.c @@ -1,8 +1,7 @@ /* - * arch/s390/kernel/signal32.c + * arch/s390/kernel/compat_signal.c * - * S390 version - * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Copyright (C) IBM Corp. 2000,2006 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) * Gerhard Tonn (ton@de.ibm.com) * @@ -11,7 +10,6 @@ * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson */ -#include #include #include #include @@ -30,6 +28,7 @@ #include #include #include +#include #include "compat_linux.h" #include "compat_ptrace.h" @@ -40,6 +39,7 @@ typedef struct __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; struct sigcontext32 sc; _sigregs32 sregs; + int signo; __u8 retcode[S390_SYSCALL_SIZE]; } sigframe32; @@ -47,17 +47,15 @@ typedef struct { __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; __u8 retcode[S390_SYSCALL_SIZE]; - struct siginfo32 info; + compat_siginfo_t info; struct ucontext32 uc; } rt_sigframe32; -asmlinkage int FASTCALL(do_signal(struct pt_regs *regs, sigset_t *oldset)); - -int copy_siginfo_to_user32(siginfo_t32 *to, siginfo_t *from) +int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) { int err; - if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t32))) + if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) return -EFAULT; /* If you change siginfo_t structure, please be sure @@ -94,10 +92,14 @@ int copy_siginfo_to_user32(siginfo_t32 *to, siginfo_t *from) &to->si_addr); break; case __SI_POLL >> 16: - case __SI_TIMER >> 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; } @@ -105,105 +107,100 @@ int copy_siginfo_to_user32(siginfo_t32 *to, siginfo_t *from) return err; } -/* - * Atomically swap in the new signal mask, and wait for a signal. - */ -asmlinkage int -sys32_sigsuspend(struct pt_regs * regs,int history0, int history1, old_sigset_t mask) +int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) { - sigset_t saveset; - - mask &= _BLOCKABLE; - spin_lock_irq(¤t->sighand->siglock); - saveset = current->blocked; - siginitset(¤t->blocked, mask); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - regs->gprs[2] = -EINTR; - - while (1) { - set_current_state(TASK_INTERRUPTIBLE); - schedule(); - if (do_signal(regs, &saveset)) - return -EINTR; - } -} + int err; + u32 tmp; -asmlinkage int -sys32_rt_sigsuspend(struct pt_regs * regs,compat_sigset_t *unewset, size_t sigsetsize) -{ - sigset_t saveset, newset; - compat_sigset_t set32; + if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t))) + return -EFAULT; - /* XXX: Don't preclude handling different sized sigset_t's. */ - if (sigsetsize != sizeof(sigset_t)) - return -EINVAL; + 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 (copy_from_user(&set32, unewset, sizeof(set32))) - return -EFAULT; - switch (_NSIG_WORDS) { - case 4: newset.sig[3] = set32.sig[6] + (((long)set32.sig[7]) << 32); - case 3: newset.sig[2] = set32.sig[4] + (((long)set32.sig[5]) << 32); - case 2: newset.sig[1] = set32.sig[2] + (((long)set32.sig[3]) << 32); - case 1: newset.sig[0] = set32.sig[0] + (((long)set32.sig[1]) << 32); + 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 __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; + } } - sigdelsetmask(&newset, ~_BLOCKABLE); - - spin_lock_irq(¤t->sighand->siglock); - saveset = current->blocked; - current->blocked = newset; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - regs->gprs[2] = -EINTR; - - while (1) { - set_current_state(TASK_INTERRUPTIBLE); - schedule(); - if (do_signal(regs, &saveset)) - return -EINTR; - } -} + return err; +} asmlinkage long -sys32_sigaction(int sig, const struct old_sigaction32 *act, - struct old_sigaction32 *oact) +sys32_sigaction(int sig, const struct old_sigaction32 __user *act, + struct old_sigaction32 __user *oact) { struct k_sigaction new_ka, old_ka; + unsigned long sa_handler, sa_restorer; int ret; if (act) { compat_old_sigset_t mask; - if (verify_area(VERIFY_READ, act, sizeof(*act)) || - __get_user((unsigned long)new_ka.sa.sa_handler, &act->sa_handler) || - __get_user((unsigned long)new_ka.sa.sa_restorer, &act->sa_restorer)) + if (!access_ok(VERIFY_READ, act, sizeof(*act)) || + __get_user(sa_handler, &act->sa_handler) || + __get_user(sa_restorer, &act->sa_restorer) || + __get_user(new_ka.sa.sa_flags, &act->sa_flags) || + __get_user(mask, &act->sa_mask)) return -EFAULT; - __get_user(new_ka.sa.sa_flags, &act->sa_flags); - __get_user(mask, &act->sa_mask); + new_ka.sa.sa_handler = (__sighandler_t) sa_handler; + new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer; siginitset(&new_ka.sa.sa_mask, mask); } ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); if (!ret && oact) { - if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) || - __put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler) || - __put_user((unsigned long)old_ka.sa.sa_restorer, &oact->sa_restorer)) + sa_handler = (unsigned long) old_ka.sa.sa_handler; + sa_restorer = (unsigned long) old_ka.sa.sa_restorer; + if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || + __put_user(sa_handler, &oact->sa_handler) || + __put_user(sa_restorer, &oact->sa_restorer) || + __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || + __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) return -EFAULT; - __put_user(old_ka.sa.sa_flags, &oact->sa_flags); - __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); } return ret; } -int -do_sigaction(int sig, const struct k_sigaction *act, struct k_sigaction *oact); - -asmlinkage long -sys32_rt_sigaction(int sig, const struct sigaction32 *act, - struct sigaction32 *oact, size_t sigsetsize) +asmlinkage long +sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, + struct sigaction32 __user *oact, size_t sigsetsize) { struct k_sigaction new_ka, old_ka; + unsigned long sa_handler; int ret; compat_sigset_t set32; @@ -212,7 +209,7 @@ sys32_rt_sigaction(int sig, const struct sigaction32 *act, return -EINVAL; if (act) { - ret = get_user((unsigned long)new_ka.sa.sa_handler, &act->sa_handler); + ret = get_user(sa_handler, &act->sa_handler); ret |= __copy_from_user(&set32, &act->sa_mask, sizeof(compat_sigset_t)); switch (_NSIG_WORDS) { @@ -229,6 +226,7 @@ sys32_rt_sigaction(int sig, const struct sigaction32 *act, if (ret) return -EFAULT; + new_ka.sa.sa_handler = (__sighandler_t) sa_handler; } ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); @@ -258,30 +256,36 @@ sys32_rt_sigaction(int sig, const struct sigaction32 *act, } asmlinkage long -sys32_sigaltstack(const stack_t32 *uss, stack_t32 *uoss, struct pt_regs *regs) +sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss, + struct pt_regs *regs) { stack_t kss, koss; + unsigned long ss_sp; int ret, err = 0; mm_segment_t old_fs = get_fs(); if (uss) { if (!access_ok(VERIFY_READ, uss, sizeof(*uss))) return -EFAULT; - err |= __get_user((unsigned long) kss.ss_sp, &uss->ss_sp); + err |= __get_user(ss_sp, &uss->ss_sp); err |= __get_user(kss.ss_size, &uss->ss_size); err |= __get_user(kss.ss_flags, &uss->ss_flags); if (err) return -EFAULT; + kss.ss_sp = (void __user *) ss_sp; } set_fs (KERNEL_DS); - ret = do_sigaltstack(uss ? &kss : NULL , uoss ? &koss : NULL, regs->gprs[15]); + ret = do_sigaltstack((stack_t __user *) (uss ? &kss : NULL), + (stack_t __user *) (uoss ? &koss : NULL), + regs->gprs[15]); set_fs (old_fs); if (!ret && uoss) { if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) return -EFAULT; - err |= __put_user((unsigned long) koss.ss_sp, &uoss->ss_sp); + ss_sp = (unsigned long) koss.ss_sp; + err |= __put_user(ss_sp, &uoss->ss_sp); err |= __put_user(koss.ss_size, &uoss->ss_size); err |= __put_user(koss.ss_flags, &uoss->ss_flags); if (err) @@ -290,7 +294,7 @@ sys32_sigaltstack(const stack_t32 *uss, stack_t32 *uoss, struct pt_regs *regs) return ret; } -static int save_sigregs32(struct pt_regs *regs,_sigregs32 *sregs) +static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs) { _s390_regs_common32 regs32; int err, i; @@ -311,7 +315,7 @@ static int save_sigregs32(struct pt_regs *regs,_sigregs32 *sregs) sizeof(_s390_fp_regs32)); } -static int restore_sigregs32(struct pt_regs *regs,_sigregs32 *sregs) +static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs) { _s390_regs_common32 regs32; int err, i; @@ -343,10 +347,10 @@ static int restore_sigregs32(struct pt_regs *regs,_sigregs32 *sregs) asmlinkage long sys32_sigreturn(struct pt_regs *regs) { - sigframe32 *frame = (sigframe32 *)regs->gprs[15]; + sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15]; sigset_t set; - if (verify_area(VERIFY_READ, frame, sizeof(*frame))) + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) goto badframe; if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32)) goto badframe; @@ -365,18 +369,18 @@ asmlinkage long sys32_sigreturn(struct pt_regs *regs) badframe: force_sig(SIGSEGV, current); return 0; -} +} asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs) { - rt_sigframe32 *frame = (rt_sigframe32 *)regs->gprs[15]; + rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15]; sigset_t set; stack_t st; __u32 ss_sp; int err; mm_segment_t old_fs = get_fs(); - if (verify_area(VERIFY_READ, frame, sizeof(*frame))) + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) goto badframe; if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) goto badframe; @@ -391,16 +395,14 @@ asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs) goto badframe; err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp); - st.ss_sp = (void *) A((unsigned long)ss_sp); + st.ss_sp = compat_ptr(ss_sp); err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size); err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags); if (err) goto badframe; - /* It is more difficult to avoid calling this function than to - call it and ignore errors. */ - set_fs (KERNEL_DS); - do_sigaltstack(&st, NULL, regs->gprs[15]); + set_fs (KERNEL_DS); + do_sigaltstack((stack_t __user *)&st, NULL, regs->gprs[15]); set_fs (old_fs); return regs->gprs[2]; @@ -418,7 +420,7 @@ badframe: /* * Determine which stack to use.. */ -static inline void * +static inline void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) { unsigned long sp; @@ -428,7 +430,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) /* This is the X/Open sanctioned signal stack switching. */ if (ka->sa.sa_flags & SA_ONSTACK) { - if (! on_sig_stack(sp)) + if (! sas_ss_flags(sp)) sp = current->sas_ss_sp + current->sas_ss_size; } @@ -439,7 +441,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) sp = (unsigned long) ka->sa.sa_restorer; } - return (void *)((sp - frame_size) & -8ul); + return (void __user *)((sp - frame_size) & -8ul); } static inline int map_signal(int sig) @@ -452,10 +454,10 @@ static inline int map_signal(int sig) return sig; } -static void setup_frame32(int sig, struct k_sigaction *ka, +static int setup_frame32(int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs * regs) { - sigframe32 *frame = get_sigframe(ka, regs, sizeof(sigframe32)); + sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32)); if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32))) goto give_sigsegv; @@ -474,12 +476,12 @@ static void setup_frame32(int sig, struct k_sigaction *ka, } else { regs->gprs[14] = (__u64) frame->retcode; if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, - (u16 *)(frame->retcode))) + (u16 __user *)(frame->retcode))) goto give_sigsegv; } /* Set up backchain. */ - if (__put_user(regs->gprs[15], (unsigned int *) frame)) + if (__put_user(regs->gprs[15], (unsigned int __user *) frame)) goto give_sigsegv; /* Set up registers for signal handler */ @@ -493,19 +495,22 @@ static void setup_frame32(int sig, struct k_sigaction *ka, To avoid breaking binary compatibility, they are passed as args. */ regs->gprs[4] = current->thread.trap_no; regs->gprs[5] = current->thread.prot_addr; - return; + + /* Place signal number on stack to allow backtrace from handler. */ + if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) + goto give_sigsegv; + return 0; give_sigsegv: - if (sig == SIGSEGV) - ka->sa.sa_handler = SIG_DFL; - force_sig(SIGSEGV, current); + force_sigsegv(sig, current); + return -EFAULT; } -static void setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info, +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 *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32)); + rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32)); if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32))) goto give_sigsegv; @@ -531,11 +536,11 @@ static void setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info, } else { regs->gprs[14] = (__u64) frame->retcode; err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, - (u16 *)(frame->retcode)); + (u16 __user *)(frame->retcode)); } /* Set up backchain. */ - if (__put_user(regs->gprs[15], (unsigned int *) frame)) + if (__put_user(regs->gprs[15], (unsigned int __user *) frame)) goto give_sigsegv; /* Set up registers for signal handler */ @@ -545,39 +550,39 @@ static void setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info, regs->gprs[2] = map_signal(sig); regs->gprs[3] = (__u64) &frame->info; regs->gprs[4] = (__u64) &frame->uc; - return; + return 0; give_sigsegv: - if (sig == SIGSEGV) - ka->sa.sa_handler = SIG_DFL; - force_sig(SIGSEGV, current); + force_sigsegv(sig, current); + return -EFAULT; } /* * OK, we're invoking a handler */ -void -handle_signal32(unsigned long sig, siginfo_t *info, sigset_t *oldset, - struct pt_regs * regs) +int +handle_signal32(unsigned long sig, struct k_sigaction *ka, + siginfo_t *info, sigset_t *oldset, struct pt_regs * regs) { - struct k_sigaction *ka = ¤t->sighand->action[sig-1]; + int ret; /* Set up the stack frame */ if (ka->sa.sa_flags & SA_SIGINFO) - setup_rt_frame32(sig, ka, info, oldset, regs); + ret = setup_rt_frame32(sig, ka, info, oldset, regs); else - setup_frame32(sig, ka, oldset, regs); + ret = setup_frame32(sig, ka, oldset, regs); - if (ka->sa.sa_flags & SA_ONESHOT) - ka->sa.sa_handler = SIG_DFL; - - if (!(ka->sa.sa_flags & SA_NODEFER)) { + if (ret == 0) { spin_lock_irq(¤t->sighand->siglock); sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); - sigaddset(¤t->blocked,sig); + if (!(ka->sa.sa_flags & SA_NODEFER)) + sigaddset(¤t->blocked,sig); recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); + + tracehook_report_handle_signal(sig, ka, oldset, regs); } -} + return ret; +}