| /* |
| * linux/kernel/compat.c |
| * |
| * Kernel compatibililty routines for e.g. 32 bit syscall support |
| * on 64 bit kernels. |
| * |
| * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/compat.h> |
| #include <linux/errno.h> |
| #include <linux/time.h> |
| #include <linux/signal.h> |
| #include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */ |
| #include <linux/syscalls.h> |
| #include <linux/unistd.h> |
| #include <linux/security.h> |
| #include <linux/timex.h> |
| #include <linux/export.h> |
| #include <linux/migrate.h> |
| #include <linux/posix-timers.h> |
| #include <linux/times.h> |
| #include <linux/ptrace.h> |
| #include <linux/gfp.h> |
| |
| #include <linux/uaccess.h> |
| |
| int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp) |
| { |
| struct compat_timex tx32; |
| |
| memset(txc, 0, sizeof(struct timex)); |
| if (copy_from_user(&tx32, utp, sizeof(struct compat_timex))) |
| return -EFAULT; |
| |
| txc->modes = tx32.modes; |
| txc->offset = tx32.offset; |
| txc->freq = tx32.freq; |
| txc->maxerror = tx32.maxerror; |
| txc->esterror = tx32.esterror; |
| txc->status = tx32.status; |
| txc->constant = tx32.constant; |
| txc->precision = tx32.precision; |
| txc->tolerance = tx32.tolerance; |
| txc->time.tv_sec = tx32.time.tv_sec; |
| txc->time.tv_usec = tx32.time.tv_usec; |
| txc->tick = tx32.tick; |
| txc->ppsfreq = tx32.ppsfreq; |
| txc->jitter = tx32.jitter; |
| txc->shift = tx32.shift; |
| txc->stabil = tx32.stabil; |
| txc->jitcnt = tx32.jitcnt; |
| txc->calcnt = tx32.calcnt; |
| txc->errcnt = tx32.errcnt; |
| txc->stbcnt = tx32.stbcnt; |
| |
| return 0; |
| } |
| |
| int compat_put_timex(struct compat_timex __user *utp, const struct timex *txc) |
| { |
| struct compat_timex tx32; |
| |
| memset(&tx32, 0, sizeof(struct compat_timex)); |
| tx32.modes = txc->modes; |
| tx32.offset = txc->offset; |
| tx32.freq = txc->freq; |
| tx32.maxerror = txc->maxerror; |
| tx32.esterror = txc->esterror; |
| tx32.status = txc->status; |
| tx32.constant = txc->constant; |
| tx32.precision = txc->precision; |
| tx32.tolerance = txc->tolerance; |
| tx32.time.tv_sec = txc->time.tv_sec; |
| tx32.time.tv_usec = txc->time.tv_usec; |
| tx32.tick = txc->tick; |
| tx32.ppsfreq = txc->ppsfreq; |
| tx32.jitter = txc->jitter; |
| tx32.shift = txc->shift; |
| tx32.stabil = txc->stabil; |
| tx32.jitcnt = txc->jitcnt; |
| tx32.calcnt = txc->calcnt; |
| tx32.errcnt = txc->errcnt; |
| tx32.stbcnt = txc->stbcnt; |
| tx32.tai = txc->tai; |
| if (copy_to_user(utp, &tx32, sizeof(struct compat_timex))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv) |
| { |
| return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) || |
| __get_user(tv->tv_sec, &ctv->tv_sec) || |
| __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; |
| } |
| |
| static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv) |
| { |
| return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) || |
| __put_user(tv->tv_sec, &ctv->tv_sec) || |
| __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; |
| } |
| |
| static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts) |
| { |
| return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || |
| __get_user(ts->tv_sec, &cts->tv_sec) || |
| __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; |
| } |
| |
| static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts) |
| { |
| return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || |
| __put_user(ts->tv_sec, &cts->tv_sec) || |
| __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; |
| } |
| |
| int compat_get_timeval(struct timeval *tv, const void __user *utv) |
| { |
| if (COMPAT_USE_64BIT_TIME) |
| return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0; |
| else |
| return __compat_get_timeval(tv, utv); |
| } |
| EXPORT_SYMBOL_GPL(compat_get_timeval); |
| |
| int compat_put_timeval(const struct timeval *tv, void __user *utv) |
| { |
| if (COMPAT_USE_64BIT_TIME) |
| return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0; |
| else |
| return __compat_put_timeval(tv, utv); |
| } |
| EXPORT_SYMBOL_GPL(compat_put_timeval); |
| |
| int compat_get_timespec(struct timespec *ts, const void __user *uts) |
| { |
| if (COMPAT_USE_64BIT_TIME) |
| return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0; |
| else |
| return __compat_get_timespec(ts, uts); |
| } |
| EXPORT_SYMBOL_GPL(compat_get_timespec); |
| |
| int compat_put_timespec(const struct timespec *ts, void __user *uts) |
| { |
| if (COMPAT_USE_64BIT_TIME) |
| return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0; |
| else |
| return __compat_put_timespec(ts, uts); |
| } |
| EXPORT_SYMBOL_GPL(compat_put_timespec); |
| |
| int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i) |
| { |
| struct compat_itimerval v32; |
| |
| if (copy_from_user(&v32, i, sizeof(struct compat_itimerval))) |
| return -EFAULT; |
| o->it_interval.tv_sec = v32.it_interval.tv_sec; |
| o->it_interval.tv_usec = v32.it_interval.tv_usec; |
| o->it_value.tv_sec = v32.it_value.tv_sec; |
| o->it_value.tv_usec = v32.it_value.tv_usec; |
| return 0; |
| } |
| |
| int put_compat_itimerval(struct compat_itimerval __user *o, const struct itimerval *i) |
| { |
| struct compat_itimerval v32; |
| |
| v32.it_interval.tv_sec = i->it_interval.tv_sec; |
| v32.it_interval.tv_usec = i->it_interval.tv_usec; |
| v32.it_value.tv_sec = i->it_value.tv_sec; |
| v32.it_value.tv_usec = i->it_value.tv_usec; |
| return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0; |
| } |
| |
| #ifdef __ARCH_WANT_SYS_SIGPROCMASK |
| |
| /* |
| * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the |
| * blocked set of signals to the supplied signal set |
| */ |
| static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) |
| { |
| memcpy(blocked->sig, &set, sizeof(set)); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, |
| compat_old_sigset_t __user *, nset, |
| compat_old_sigset_t __user *, oset) |
| { |
| old_sigset_t old_set, new_set; |
| sigset_t new_blocked; |
| |
| old_set = current->blocked.sig[0]; |
| |
| if (nset) { |
| if (get_user(new_set, nset)) |
| return -EFAULT; |
| new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); |
| |
| new_blocked = current->blocked; |
| |
| switch (how) { |
| case SIG_BLOCK: |
| sigaddsetmask(&new_blocked, new_set); |
| break; |
| case SIG_UNBLOCK: |
| sigdelsetmask(&new_blocked, new_set); |
| break; |
| case SIG_SETMASK: |
| compat_sig_setmask(&new_blocked, new_set); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| set_current_blocked(&new_blocked); |
| } |
| |
| if (oset) { |
| if (put_user(old_set, oset)) |
| return -EFAULT; |
| } |
| |
| return 0; |
| } |
| |
| #endif |
| |
| int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) |
| { |
| struct compat_rusage r32; |
| memset(&r32, 0, sizeof(r32)); |
| r32.ru_utime.tv_sec = r->ru_utime.tv_sec; |
| r32.ru_utime.tv_usec = r->ru_utime.tv_usec; |
| r32.ru_stime.tv_sec = r->ru_stime.tv_sec; |
| r32.ru_stime.tv_usec = r->ru_stime.tv_usec; |
| r32.ru_maxrss = r->ru_maxrss; |
| r32.ru_ixrss = r->ru_ixrss; |
| r32.ru_idrss = r->ru_idrss; |
| r32.ru_isrss = r->ru_isrss; |
| r32.ru_minflt = r->ru_minflt; |
| r32.ru_majflt = r->ru_majflt; |
| r32.ru_nswap = r->ru_nswap; |
| r32.ru_inblock = r->ru_inblock; |
| r32.ru_oublock = r->ru_oublock; |
| r32.ru_msgsnd = r->ru_msgsnd; |
| r32.ru_msgrcv = r->ru_msgrcv; |
| r32.ru_nsignals = r->ru_nsignals; |
| r32.ru_nvcsw = r->ru_nvcsw; |
| r32.ru_nivcsw = r->ru_nivcsw; |
| if (copy_to_user(ru, &r32, sizeof(r32))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, |
| unsigned len, struct cpumask *new_mask) |
| { |
| unsigned long *k; |
| |
| if (len < cpumask_size()) |
| memset(new_mask, 0, cpumask_size()); |
| else if (len > cpumask_size()) |
| len = cpumask_size(); |
| |
| k = cpumask_bits(new_mask); |
| return compat_get_bitmap(k, user_mask_ptr, len * 8); |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, |
| unsigned int, len, |
| compat_ulong_t __user *, user_mask_ptr) |
| { |
| cpumask_var_t new_mask; |
| int retval; |
| |
| if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) |
| return -ENOMEM; |
| |
| retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); |
| if (retval) |
| goto out; |
| |
| retval = sched_setaffinity(pid, new_mask); |
| out: |
| free_cpumask_var(new_mask); |
| return retval; |
| } |
| |
| COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, |
| compat_ulong_t __user *, user_mask_ptr) |
| { |
| int ret; |
| cpumask_var_t mask; |
| |
| if ((len * BITS_PER_BYTE) < nr_cpu_ids) |
| return -EINVAL; |
| if (len & (sizeof(compat_ulong_t)-1)) |
| return -EINVAL; |
| |
| if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
| return -ENOMEM; |
| |
| ret = sched_getaffinity(pid, mask); |
| if (ret == 0) { |
| unsigned int retlen = min(len, cpumask_size()); |
| |
| if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) |
| ret = -EFAULT; |
| else |
| ret = retlen; |
| } |
| free_cpumask_var(mask); |
| |
| return ret; |
| } |
| |
| /* |
| * We currently only need the following fields from the sigevent |
| * structure: sigev_value, sigev_signo, sig_notify and (sometimes |
| * sigev_notify_thread_id). The others are handled in user mode. |
| * We also assume that copying sigev_value.sival_int is sufficient |
| * to keep all the bits of sigev_value.sival_ptr intact. |
| */ |
| int get_compat_sigevent(struct sigevent *event, |
| const struct compat_sigevent __user *u_event) |
| { |
| memset(event, 0, sizeof(*event)); |
| return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || |
| __get_user(event->sigev_value.sival_int, |
| &u_event->sigev_value.sival_int) || |
| __get_user(event->sigev_signo, &u_event->sigev_signo) || |
| __get_user(event->sigev_notify, &u_event->sigev_notify) || |
| __get_user(event->sigev_notify_thread_id, |
| &u_event->sigev_notify_thread_id)) |
| ? -EFAULT : 0; |
| } |
| |
| long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, |
| unsigned long bitmap_size) |
| { |
| unsigned long nr_compat_longs; |
| |
| /* align bitmap up to nearest compat_long_t boundary */ |
| bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); |
| nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); |
| |
| if (!user_access_begin(VERIFY_READ, umask, bitmap_size / 8)) |
| return -EFAULT; |
| |
| while (nr_compat_longs > 1) { |
| compat_ulong_t l1, l2; |
| unsafe_get_user(l1, umask++, Efault); |
| unsafe_get_user(l2, umask++, Efault); |
| *mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) | l1; |
| nr_compat_longs -= 2; |
| } |
| if (nr_compat_longs) |
| unsafe_get_user(*mask, umask++, Efault); |
| user_access_end(); |
| return 0; |
| |
| Efault: |
| user_access_end(); |
| return -EFAULT; |
| } |
| |
| long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, |
| unsigned long bitmap_size) |
| { |
| unsigned long nr_compat_longs; |
| |
| /* align bitmap up to nearest compat_long_t boundary */ |
| bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); |
| nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); |
| |
| if (!user_access_begin(VERIFY_WRITE, umask, bitmap_size / 8)) |
| return -EFAULT; |
| |
| while (nr_compat_longs > 1) { |
| unsigned long m = *mask++; |
| unsafe_put_user((compat_ulong_t)m, umask++, Efault); |
| unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault); |
| nr_compat_longs -= 2; |
| } |
| if (nr_compat_longs) |
| unsafe_put_user((compat_ulong_t)*mask, umask++, Efault); |
| user_access_end(); |
| return 0; |
| Efault: |
| user_access_end(); |
| return -EFAULT; |
| } |
| |
| int |
| get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat) |
| { |
| #ifdef __BIG_ENDIAN |
| compat_sigset_t v; |
| if (copy_from_user(&v, compat, sizeof(compat_sigset_t))) |
| return -EFAULT; |
| switch (_NSIG_WORDS) { |
| case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 ); |
| case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 ); |
| case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 ); |
| case 1: set->sig[0] = v.sig[0] | (((long)v.sig[1]) << 32 ); |
| } |
| #else |
| if (copy_from_user(set, compat, sizeof(compat_sigset_t))) |
| return -EFAULT; |
| #endif |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(get_compat_sigset); |
| |
| /* |
| * Allocate user-space memory for the duration of a single system call, |
| * in order to marshall parameters inside a compat thunk. |
| */ |
| void __user *compat_alloc_user_space(unsigned long len) |
| { |
| void __user *ptr; |
| |
| /* If len would occupy more than half of the entire compat space... */ |
| if (unlikely(len > (((compat_uptr_t)~0) >> 1))) |
| return NULL; |
| |
| ptr = arch_compat_alloc_user_space(len); |
| |
| if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) |
| return NULL; |
| |
| return ptr; |
| } |
| EXPORT_SYMBOL_GPL(compat_alloc_user_space); |