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![Al Viro](/assets/img/avatar_default.png)
... and finally kill the sodding compat_convert_timespec() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
601 lines
16 KiB
C
601 lines
16 KiB
C
/*
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* linux/kernel/compat.c
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*
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* Kernel compatibililty routines for e.g. 32 bit syscall support
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* on 64 bit kernels.
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*
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* Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <linux/compat.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/signal.h>
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#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
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#include <linux/syscalls.h>
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#include <linux/unistd.h>
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#include <linux/security.h>
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#include <linux/timex.h>
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#include <linux/export.h>
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#include <linux/migrate.h>
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#include <linux/posix-timers.h>
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#include <linux/times.h>
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#include <linux/ptrace.h>
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#include <linux/gfp.h>
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#include <linux/uaccess.h>
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int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp)
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{
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struct compat_timex tx32;
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if (copy_from_user(&tx32, utp, sizeof(struct compat_timex)))
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return -EFAULT;
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txc->modes = tx32.modes;
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txc->offset = tx32.offset;
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txc->freq = tx32.freq;
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txc->maxerror = tx32.maxerror;
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txc->esterror = tx32.esterror;
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txc->status = tx32.status;
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txc->constant = tx32.constant;
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txc->precision = tx32.precision;
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txc->tolerance = tx32.tolerance;
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txc->time.tv_sec = tx32.time.tv_sec;
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txc->time.tv_usec = tx32.time.tv_usec;
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txc->tick = tx32.tick;
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txc->ppsfreq = tx32.ppsfreq;
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txc->jitter = tx32.jitter;
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txc->shift = tx32.shift;
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txc->stabil = tx32.stabil;
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txc->jitcnt = tx32.jitcnt;
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txc->calcnt = tx32.calcnt;
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txc->errcnt = tx32.errcnt;
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txc->stbcnt = tx32.stbcnt;
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return 0;
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}
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int compat_put_timex(struct compat_timex __user *utp, const struct timex *txc)
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{
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struct compat_timex tx32;
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memset(&tx32, 0, sizeof(struct compat_timex));
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tx32.modes = txc->modes;
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tx32.offset = txc->offset;
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tx32.freq = txc->freq;
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tx32.maxerror = txc->maxerror;
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tx32.esterror = txc->esterror;
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tx32.status = txc->status;
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tx32.constant = txc->constant;
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tx32.precision = txc->precision;
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tx32.tolerance = txc->tolerance;
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tx32.time.tv_sec = txc->time.tv_sec;
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tx32.time.tv_usec = txc->time.tv_usec;
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tx32.tick = txc->tick;
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tx32.ppsfreq = txc->ppsfreq;
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tx32.jitter = txc->jitter;
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tx32.shift = txc->shift;
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tx32.stabil = txc->stabil;
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tx32.jitcnt = txc->jitcnt;
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tx32.calcnt = txc->calcnt;
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tx32.errcnt = txc->errcnt;
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tx32.stbcnt = txc->stbcnt;
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tx32.tai = txc->tai;
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if (copy_to_user(utp, &tx32, sizeof(struct compat_timex)))
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return -EFAULT;
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return 0;
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}
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static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
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{
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return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
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__get_user(tv->tv_sec, &ctv->tv_sec) ||
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__get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
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}
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static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
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{
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return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
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__put_user(tv->tv_sec, &ctv->tv_sec) ||
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__put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
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}
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static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
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{
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return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
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__get_user(ts->tv_sec, &cts->tv_sec) ||
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__get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
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}
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static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
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{
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return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
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__put_user(ts->tv_sec, &cts->tv_sec) ||
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__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
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}
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static int __compat_get_timespec64(struct timespec64 *ts64,
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const struct compat_timespec __user *cts)
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{
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struct compat_timespec ts;
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int ret;
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ret = copy_from_user(&ts, cts, sizeof(ts));
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if (ret)
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return -EFAULT;
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ts64->tv_sec = ts.tv_sec;
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ts64->tv_nsec = ts.tv_nsec;
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return 0;
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}
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static int __compat_put_timespec64(const struct timespec64 *ts64,
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struct compat_timespec __user *cts)
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{
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struct compat_timespec ts = {
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.tv_sec = ts64->tv_sec,
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.tv_nsec = ts64->tv_nsec
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};
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return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
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}
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int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
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{
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if (COMPAT_USE_64BIT_TIME)
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return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
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else
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return __compat_get_timespec64(ts, uts);
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}
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EXPORT_SYMBOL_GPL(compat_get_timespec64);
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int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
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{
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if (COMPAT_USE_64BIT_TIME)
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return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
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else
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return __compat_put_timespec64(ts, uts);
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}
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EXPORT_SYMBOL_GPL(compat_put_timespec64);
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int compat_get_timeval(struct timeval *tv, const void __user *utv)
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{
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if (COMPAT_USE_64BIT_TIME)
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return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
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else
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return __compat_get_timeval(tv, utv);
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}
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EXPORT_SYMBOL_GPL(compat_get_timeval);
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int compat_put_timeval(const struct timeval *tv, void __user *utv)
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{
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if (COMPAT_USE_64BIT_TIME)
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return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
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else
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return __compat_put_timeval(tv, utv);
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}
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EXPORT_SYMBOL_GPL(compat_put_timeval);
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int compat_get_timespec(struct timespec *ts, const void __user *uts)
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{
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if (COMPAT_USE_64BIT_TIME)
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return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
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else
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return __compat_get_timespec(ts, uts);
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}
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EXPORT_SYMBOL_GPL(compat_get_timespec);
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int compat_put_timespec(const struct timespec *ts, void __user *uts)
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{
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if (COMPAT_USE_64BIT_TIME)
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return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
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else
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return __compat_put_timespec(ts, uts);
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}
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EXPORT_SYMBOL_GPL(compat_put_timespec);
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int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i)
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{
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struct compat_itimerval v32;
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if (copy_from_user(&v32, i, sizeof(struct compat_itimerval)))
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return -EFAULT;
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o->it_interval.tv_sec = v32.it_interval.tv_sec;
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o->it_interval.tv_usec = v32.it_interval.tv_usec;
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o->it_value.tv_sec = v32.it_value.tv_sec;
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o->it_value.tv_usec = v32.it_value.tv_usec;
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return 0;
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}
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int put_compat_itimerval(struct compat_itimerval __user *o, const struct itimerval *i)
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{
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struct compat_itimerval v32;
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v32.it_interval.tv_sec = i->it_interval.tv_sec;
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v32.it_interval.tv_usec = i->it_interval.tv_usec;
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v32.it_value.tv_sec = i->it_value.tv_sec;
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v32.it_value.tv_usec = i->it_value.tv_usec;
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return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0;
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}
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#ifdef __ARCH_WANT_SYS_SIGPROCMASK
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/*
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* sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
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* blocked set of signals to the supplied signal set
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*/
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static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
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{
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memcpy(blocked->sig, &set, sizeof(set));
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}
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COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
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compat_old_sigset_t __user *, nset,
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compat_old_sigset_t __user *, oset)
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{
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old_sigset_t old_set, new_set;
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sigset_t new_blocked;
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old_set = current->blocked.sig[0];
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if (nset) {
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if (get_user(new_set, nset))
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return -EFAULT;
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new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));
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new_blocked = current->blocked;
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switch (how) {
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case SIG_BLOCK:
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sigaddsetmask(&new_blocked, new_set);
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break;
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case SIG_UNBLOCK:
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sigdelsetmask(&new_blocked, new_set);
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break;
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case SIG_SETMASK:
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compat_sig_setmask(&new_blocked, new_set);
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break;
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default:
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return -EINVAL;
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}
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set_current_blocked(&new_blocked);
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}
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if (oset) {
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if (put_user(old_set, oset))
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return -EFAULT;
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}
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return 0;
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}
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#endif
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int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
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{
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struct compat_rusage r32;
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memset(&r32, 0, sizeof(r32));
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r32.ru_utime.tv_sec = r->ru_utime.tv_sec;
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r32.ru_utime.tv_usec = r->ru_utime.tv_usec;
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r32.ru_stime.tv_sec = r->ru_stime.tv_sec;
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r32.ru_stime.tv_usec = r->ru_stime.tv_usec;
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r32.ru_maxrss = r->ru_maxrss;
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r32.ru_ixrss = r->ru_ixrss;
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r32.ru_idrss = r->ru_idrss;
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r32.ru_isrss = r->ru_isrss;
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r32.ru_minflt = r->ru_minflt;
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r32.ru_majflt = r->ru_majflt;
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r32.ru_nswap = r->ru_nswap;
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r32.ru_inblock = r->ru_inblock;
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r32.ru_oublock = r->ru_oublock;
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r32.ru_msgsnd = r->ru_msgsnd;
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r32.ru_msgrcv = r->ru_msgrcv;
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r32.ru_nsignals = r->ru_nsignals;
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r32.ru_nvcsw = r->ru_nvcsw;
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r32.ru_nivcsw = r->ru_nivcsw;
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if (copy_to_user(ru, &r32, sizeof(r32)))
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return -EFAULT;
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return 0;
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}
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static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
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unsigned len, struct cpumask *new_mask)
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{
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unsigned long *k;
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if (len < cpumask_size())
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memset(new_mask, 0, cpumask_size());
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else if (len > cpumask_size())
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len = cpumask_size();
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k = cpumask_bits(new_mask);
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return compat_get_bitmap(k, user_mask_ptr, len * 8);
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}
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COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
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unsigned int, len,
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compat_ulong_t __user *, user_mask_ptr)
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{
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cpumask_var_t new_mask;
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int retval;
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if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
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return -ENOMEM;
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retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
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if (retval)
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goto out;
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retval = sched_setaffinity(pid, new_mask);
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out:
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free_cpumask_var(new_mask);
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return retval;
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}
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COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
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compat_ulong_t __user *, user_mask_ptr)
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{
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int ret;
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cpumask_var_t mask;
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if ((len * BITS_PER_BYTE) < nr_cpu_ids)
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return -EINVAL;
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if (len & (sizeof(compat_ulong_t)-1))
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return -EINVAL;
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if (!alloc_cpumask_var(&mask, GFP_KERNEL))
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return -ENOMEM;
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ret = sched_getaffinity(pid, mask);
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if (ret == 0) {
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size_t retlen = min_t(size_t, len, cpumask_size());
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if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
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ret = -EFAULT;
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else
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ret = retlen;
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}
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free_cpumask_var(mask);
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return ret;
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}
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int get_compat_itimerspec(struct itimerspec *dst,
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const struct compat_itimerspec __user *src)
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{
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if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
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__compat_get_timespec(&dst->it_value, &src->it_value))
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return -EFAULT;
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return 0;
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}
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int put_compat_itimerspec(struct compat_itimerspec __user *dst,
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const struct itimerspec *src)
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{
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if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
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__compat_put_timespec(&src->it_value, &dst->it_value))
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return -EFAULT;
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return 0;
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}
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int get_compat_itimerspec64(struct itimerspec64 *its,
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const struct compat_itimerspec __user *uits)
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{
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if (__compat_get_timespec64(&its->it_interval, &uits->it_interval) ||
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__compat_get_timespec64(&its->it_value, &uits->it_value))
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return -EFAULT;
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return 0;
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}
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EXPORT_SYMBOL_GPL(get_compat_itimerspec64);
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int put_compat_itimerspec64(const struct itimerspec64 *its,
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struct compat_itimerspec __user *uits)
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{
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if (__compat_put_timespec64(&its->it_interval, &uits->it_interval) ||
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__compat_put_timespec64(&its->it_value, &uits->it_value))
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return -EFAULT;
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return 0;
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}
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EXPORT_SYMBOL_GPL(put_compat_itimerspec64);
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/*
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* We currently only need the following fields from the sigevent
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* structure: sigev_value, sigev_signo, sig_notify and (sometimes
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* sigev_notify_thread_id). The others are handled in user mode.
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* We also assume that copying sigev_value.sival_int is sufficient
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* to keep all the bits of sigev_value.sival_ptr intact.
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*/
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int get_compat_sigevent(struct sigevent *event,
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const struct compat_sigevent __user *u_event)
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{
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memset(event, 0, sizeof(*event));
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return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
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__get_user(event->sigev_value.sival_int,
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&u_event->sigev_value.sival_int) ||
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__get_user(event->sigev_signo, &u_event->sigev_signo) ||
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__get_user(event->sigev_notify, &u_event->sigev_notify) ||
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__get_user(event->sigev_notify_thread_id,
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&u_event->sigev_notify_thread_id))
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? -EFAULT : 0;
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}
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long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
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unsigned long bitmap_size)
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{
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unsigned long nr_compat_longs;
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/* align bitmap up to nearest compat_long_t boundary */
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bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
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nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
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if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
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return -EFAULT;
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user_access_begin();
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while (nr_compat_longs > 1) {
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compat_ulong_t l1, l2;
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unsafe_get_user(l1, umask++, Efault);
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unsafe_get_user(l2, umask++, Efault);
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*mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) | l1;
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nr_compat_longs -= 2;
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}
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if (nr_compat_longs)
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unsafe_get_user(*mask, umask++, Efault);
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user_access_end();
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return 0;
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Efault:
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user_access_end();
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return -EFAULT;
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}
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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 (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
|
|
return -EFAULT;
|
|
|
|
user_access_begin();
|
|
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;
|
|
}
|
|
|
|
void
|
|
sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
|
|
{
|
|
switch (_NSIG_WORDS) {
|
|
case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
|
|
case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
|
|
case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
|
|
case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(sigset_from_compat);
|
|
|
|
void
|
|
sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
|
|
{
|
|
switch (_NSIG_WORDS) {
|
|
case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
|
|
case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
|
|
case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
|
|
case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
|
|
compat_uptr_t __user *, pages32,
|
|
const int __user *, nodes,
|
|
int __user *, status,
|
|
int, flags)
|
|
{
|
|
const void __user * __user *pages;
|
|
int i;
|
|
|
|
pages = compat_alloc_user_space(nr_pages * sizeof(void *));
|
|
for (i = 0; i < nr_pages; i++) {
|
|
compat_uptr_t p;
|
|
|
|
if (get_user(p, pages32 + i) ||
|
|
put_user(compat_ptr(p), pages + i))
|
|
return -EFAULT;
|
|
}
|
|
return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
|
|
compat_ulong_t, maxnode,
|
|
const compat_ulong_t __user *, old_nodes,
|
|
const compat_ulong_t __user *, new_nodes)
|
|
{
|
|
unsigned long __user *old = NULL;
|
|
unsigned long __user *new = NULL;
|
|
nodemask_t tmp_mask;
|
|
unsigned long nr_bits;
|
|
unsigned long size;
|
|
|
|
nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
|
|
size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
|
|
if (old_nodes) {
|
|
if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
|
|
return -EFAULT;
|
|
old = compat_alloc_user_space(new_nodes ? size * 2 : size);
|
|
if (new_nodes)
|
|
new = old + size / sizeof(unsigned long);
|
|
if (copy_to_user(old, nodes_addr(tmp_mask), size))
|
|
return -EFAULT;
|
|
}
|
|
if (new_nodes) {
|
|
if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
|
|
return -EFAULT;
|
|
if (new == NULL)
|
|
new = compat_alloc_user_space(size);
|
|
if (copy_to_user(new, nodes_addr(tmp_mask), size))
|
|
return -EFAULT;
|
|
}
|
|
return sys_migrate_pages(pid, nr_bits + 1, old, new);
|
|
}
|
|
#endif
|
|
|
|
COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
|
|
compat_pid_t, pid,
|
|
struct compat_timespec __user *, interval)
|
|
{
|
|
struct timespec t;
|
|
int ret;
|
|
mm_segment_t old_fs = get_fs();
|
|
|
|
set_fs(KERNEL_DS);
|
|
ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
|
|
set_fs(old_fs);
|
|
if (compat_put_timespec(&t, interval))
|
|
return -EFAULT;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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);
|