mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-05 20:04:19 +08:00
f56141e3e2
If an attacker can cause a controlled kernel stack overflow, overwriting the restart block is a very juicy exploit target. This is because the restart_block is held in the same memory allocation as the kernel stack. Moving the restart block to struct task_struct prevents this exploit by making the restart_block harder to locate. Note that there are other fields in thread_info that are also easy targets, at least on some architectures. It's also a decent simplification, since the restart code is more or less identical on all architectures. [james.hogan@imgtec.com: metag: align thread_info::supervisor_stack] Signed-off-by: Andy Lutomirski <luto@amacapital.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: David Miller <davem@davemloft.net> Acked-by: Richard Weinberger <richard@nod.at> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Steven Miao <realmz6@gmail.com> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Tested-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chen Liqin <liqin.linux@gmail.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1175 lines
29 KiB
C
1175 lines
29 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 <asm/uaccess.h>
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static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
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{
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memset(txc, 0, sizeof(struct timex));
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if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
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__get_user(txc->modes, &utp->modes) ||
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__get_user(txc->offset, &utp->offset) ||
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__get_user(txc->freq, &utp->freq) ||
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__get_user(txc->maxerror, &utp->maxerror) ||
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__get_user(txc->esterror, &utp->esterror) ||
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__get_user(txc->status, &utp->status) ||
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__get_user(txc->constant, &utp->constant) ||
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__get_user(txc->precision, &utp->precision) ||
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__get_user(txc->tolerance, &utp->tolerance) ||
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__get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
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__get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
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__get_user(txc->tick, &utp->tick) ||
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__get_user(txc->ppsfreq, &utp->ppsfreq) ||
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__get_user(txc->jitter, &utp->jitter) ||
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__get_user(txc->shift, &utp->shift) ||
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__get_user(txc->stabil, &utp->stabil) ||
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__get_user(txc->jitcnt, &utp->jitcnt) ||
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__get_user(txc->calcnt, &utp->calcnt) ||
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__get_user(txc->errcnt, &utp->errcnt) ||
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__get_user(txc->stbcnt, &utp->stbcnt))
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return -EFAULT;
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return 0;
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}
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static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
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{
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if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
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__put_user(txc->modes, &utp->modes) ||
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__put_user(txc->offset, &utp->offset) ||
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__put_user(txc->freq, &utp->freq) ||
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__put_user(txc->maxerror, &utp->maxerror) ||
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__put_user(txc->esterror, &utp->esterror) ||
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__put_user(txc->status, &utp->status) ||
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__put_user(txc->constant, &utp->constant) ||
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__put_user(txc->precision, &utp->precision) ||
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__put_user(txc->tolerance, &utp->tolerance) ||
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__put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
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__put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
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__put_user(txc->tick, &utp->tick) ||
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__put_user(txc->ppsfreq, &utp->ppsfreq) ||
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__put_user(txc->jitter, &utp->jitter) ||
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__put_user(txc->shift, &utp->shift) ||
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__put_user(txc->stabil, &utp->stabil) ||
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__put_user(txc->jitcnt, &utp->jitcnt) ||
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__put_user(txc->calcnt, &utp->calcnt) ||
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__put_user(txc->errcnt, &utp->errcnt) ||
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__put_user(txc->stbcnt, &utp->stbcnt) ||
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__put_user(txc->tai, &utp->tai))
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return -EFAULT;
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return 0;
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}
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COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv,
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struct timezone __user *, tz)
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{
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if (tv) {
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struct timeval ktv;
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do_gettimeofday(&ktv);
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if (compat_put_timeval(&ktv, tv))
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return -EFAULT;
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}
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if (tz) {
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if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
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return -EFAULT;
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}
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return 0;
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}
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COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv,
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struct timezone __user *, tz)
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{
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struct timeval user_tv;
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struct timespec new_ts;
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struct timezone new_tz;
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if (tv) {
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if (compat_get_timeval(&user_tv, tv))
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return -EFAULT;
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new_ts.tv_sec = user_tv.tv_sec;
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new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
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}
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if (tz) {
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if (copy_from_user(&new_tz, tz, sizeof(*tz)))
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return -EFAULT;
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}
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return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
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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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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 compat_convert_timespec(struct timespec __user **kts,
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const void __user *cts)
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{
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struct timespec ts;
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struct timespec __user *uts;
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if (!cts || COMPAT_USE_64BIT_TIME) {
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*kts = (struct timespec __user *)cts;
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return 0;
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}
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uts = compat_alloc_user_space(sizeof(ts));
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if (!uts)
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return -EFAULT;
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if (compat_get_timespec(&ts, cts))
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return -EFAULT;
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if (copy_to_user(uts, &ts, sizeof(ts)))
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return -EFAULT;
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*kts = uts;
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return 0;
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}
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static long compat_nanosleep_restart(struct restart_block *restart)
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{
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struct compat_timespec __user *rmtp;
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struct timespec rmt;
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mm_segment_t oldfs;
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long ret;
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restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
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oldfs = get_fs();
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set_fs(KERNEL_DS);
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ret = hrtimer_nanosleep_restart(restart);
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set_fs(oldfs);
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if (ret == -ERESTART_RESTARTBLOCK) {
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rmtp = restart->nanosleep.compat_rmtp;
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if (rmtp && compat_put_timespec(&rmt, rmtp))
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return -EFAULT;
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}
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return ret;
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}
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COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
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struct compat_timespec __user *, rmtp)
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{
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struct timespec tu, rmt;
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mm_segment_t oldfs;
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long ret;
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if (compat_get_timespec(&tu, rqtp))
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return -EFAULT;
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if (!timespec_valid(&tu))
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return -EINVAL;
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oldfs = get_fs();
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set_fs(KERNEL_DS);
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ret = hrtimer_nanosleep(&tu,
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rmtp ? (struct timespec __user *)&rmt : NULL,
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HRTIMER_MODE_REL, CLOCK_MONOTONIC);
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set_fs(oldfs);
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/*
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* hrtimer_nanosleep() can only return 0 or
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* -ERESTART_RESTARTBLOCK here because:
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*
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* - we call it with HRTIMER_MODE_REL and therefor exclude the
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* -ERESTARTNOHAND return path.
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*
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* - we supply the rmtp argument from the task stack (due to
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* the necessary compat conversion. So the update cannot
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* fail, which excludes the -EFAULT return path as well. If
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* it fails nevertheless we have a bigger problem and wont
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* reach this place anymore.
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*
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* - if the return value is 0, we do not have to update rmtp
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* because there is no remaining time.
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*
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* We check for -ERESTART_RESTARTBLOCK nevertheless if the
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* core implementation decides to return random nonsense.
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*/
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if (ret == -ERESTART_RESTARTBLOCK) {
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struct restart_block *restart = ¤t->restart_block;
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restart->fn = compat_nanosleep_restart;
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restart->nanosleep.compat_rmtp = rmtp;
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if (rmtp && compat_put_timespec(&rmt, rmtp))
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return -EFAULT;
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}
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return ret;
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}
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static inline long get_compat_itimerval(struct itimerval *o,
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struct compat_itimerval __user *i)
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{
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return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
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(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
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__get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
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__get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
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__get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
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}
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static inline long put_compat_itimerval(struct compat_itimerval __user *o,
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struct itimerval *i)
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{
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return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
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(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
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__put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
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__put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
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__put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
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}
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COMPAT_SYSCALL_DEFINE2(getitimer, int, which,
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struct compat_itimerval __user *, it)
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{
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struct itimerval kit;
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int error;
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error = do_getitimer(which, &kit);
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if (!error && put_compat_itimerval(it, &kit))
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error = -EFAULT;
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return error;
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}
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COMPAT_SYSCALL_DEFINE3(setitimer, int, which,
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struct compat_itimerval __user *, in,
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struct compat_itimerval __user *, out)
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{
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struct itimerval kin, kout;
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int error;
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if (in) {
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if (get_compat_itimerval(&kin, in))
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return -EFAULT;
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} else
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memset(&kin, 0, sizeof(kin));
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error = do_setitimer(which, &kin, out ? &kout : NULL);
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if (error || !out)
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return error;
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if (put_compat_itimerval(out, &kout))
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return -EFAULT;
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return 0;
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}
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static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
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{
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return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
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}
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COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
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{
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if (tbuf) {
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struct tms tms;
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struct compat_tms tmp;
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do_sys_times(&tms);
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/* Convert our struct tms to the compat version. */
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tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
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tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
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tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
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tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
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if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
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return -EFAULT;
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}
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force_successful_syscall_return();
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return compat_jiffies_to_clock_t(jiffies);
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}
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#ifdef __ARCH_WANT_SYS_SIGPENDING
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/*
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* Assumption: old_sigset_t and compat_old_sigset_t are both
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* types that can be passed to put_user()/get_user().
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*/
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COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set)
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{
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old_sigset_t s;
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long ret;
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mm_segment_t old_fs = get_fs();
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set_fs(KERNEL_DS);
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ret = sys_sigpending((old_sigset_t __user *) &s);
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set_fs(old_fs);
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if (ret == 0)
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ret = put_user(s, set);
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return ret;
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}
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#endif
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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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|
{
|
|
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
|
|
|
|
COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
|
|
struct compat_rlimit __user *, rlim)
|
|
{
|
|
struct rlimit r;
|
|
|
|
if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
|
|
__get_user(r.rlim_cur, &rlim->rlim_cur) ||
|
|
__get_user(r.rlim_max, &rlim->rlim_max))
|
|
return -EFAULT;
|
|
|
|
if (r.rlim_cur == COMPAT_RLIM_INFINITY)
|
|
r.rlim_cur = RLIM_INFINITY;
|
|
if (r.rlim_max == COMPAT_RLIM_INFINITY)
|
|
r.rlim_max = RLIM_INFINITY;
|
|
return do_prlimit(current, resource, &r, NULL);
|
|
}
|
|
|
|
#ifdef COMPAT_RLIM_OLD_INFINITY
|
|
|
|
COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
|
|
struct compat_rlimit __user *, rlim)
|
|
{
|
|
struct rlimit r;
|
|
int ret;
|
|
mm_segment_t old_fs = get_fs();
|
|
|
|
set_fs(KERNEL_DS);
|
|
ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r);
|
|
set_fs(old_fs);
|
|
|
|
if (!ret) {
|
|
if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
|
|
r.rlim_cur = COMPAT_RLIM_INFINITY;
|
|
if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
|
|
r.rlim_max = COMPAT_RLIM_INFINITY;
|
|
|
|
if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
|
|
__put_user(r.rlim_cur, &rlim->rlim_cur) ||
|
|
__put_user(r.rlim_max, &rlim->rlim_max))
|
|
return -EFAULT;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#endif
|
|
|
|
COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
|
|
struct compat_rlimit __user *, rlim)
|
|
{
|
|
struct rlimit r;
|
|
int ret;
|
|
|
|
ret = do_prlimit(current, resource, NULL, &r);
|
|
if (!ret) {
|
|
if (r.rlim_cur > COMPAT_RLIM_INFINITY)
|
|
r.rlim_cur = COMPAT_RLIM_INFINITY;
|
|
if (r.rlim_max > COMPAT_RLIM_INFINITY)
|
|
r.rlim_max = COMPAT_RLIM_INFINITY;
|
|
|
|
if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
|
|
__put_user(r.rlim_cur, &rlim->rlim_cur) ||
|
|
__put_user(r.rlim_max, &rlim->rlim_max))
|
|
return -EFAULT;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
|
|
{
|
|
if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
|
|
__put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
|
|
__put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
|
|
__put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
|
|
__put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
|
|
__put_user(r->ru_maxrss, &ru->ru_maxrss) ||
|
|
__put_user(r->ru_ixrss, &ru->ru_ixrss) ||
|
|
__put_user(r->ru_idrss, &ru->ru_idrss) ||
|
|
__put_user(r->ru_isrss, &ru->ru_isrss) ||
|
|
__put_user(r->ru_minflt, &ru->ru_minflt) ||
|
|
__put_user(r->ru_majflt, &ru->ru_majflt) ||
|
|
__put_user(r->ru_nswap, &ru->ru_nswap) ||
|
|
__put_user(r->ru_inblock, &ru->ru_inblock) ||
|
|
__put_user(r->ru_oublock, &ru->ru_oublock) ||
|
|
__put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
|
|
__put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
|
|
__put_user(r->ru_nsignals, &ru->ru_nsignals) ||
|
|
__put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
|
|
__put_user(r->ru_nivcsw, &ru->ru_nivcsw))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE4(wait4,
|
|
compat_pid_t, pid,
|
|
compat_uint_t __user *, stat_addr,
|
|
int, options,
|
|
struct compat_rusage __user *, ru)
|
|
{
|
|
if (!ru) {
|
|
return sys_wait4(pid, stat_addr, options, NULL);
|
|
} else {
|
|
struct rusage r;
|
|
int ret;
|
|
unsigned int status;
|
|
mm_segment_t old_fs = get_fs();
|
|
|
|
set_fs (KERNEL_DS);
|
|
ret = sys_wait4(pid,
|
|
(stat_addr ?
|
|
(unsigned int __user *) &status : NULL),
|
|
options, (struct rusage __user *) &r);
|
|
set_fs (old_fs);
|
|
|
|
if (ret > 0) {
|
|
if (put_compat_rusage(&r, ru))
|
|
return -EFAULT;
|
|
if (stat_addr && put_user(status, stat_addr))
|
|
return -EFAULT;
|
|
}
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE5(waitid,
|
|
int, which, compat_pid_t, pid,
|
|
struct compat_siginfo __user *, uinfo, int, options,
|
|
struct compat_rusage __user *, uru)
|
|
{
|
|
siginfo_t info;
|
|
struct rusage ru;
|
|
long ret;
|
|
mm_segment_t old_fs = get_fs();
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
|
|
set_fs(KERNEL_DS);
|
|
ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
|
|
uru ? (struct rusage __user *)&ru : NULL);
|
|
set_fs(old_fs);
|
|
|
|
if ((ret < 0) || (info.si_signo == 0))
|
|
return ret;
|
|
|
|
if (uru) {
|
|
/* sys_waitid() overwrites everything in ru */
|
|
if (COMPAT_USE_64BIT_TIME)
|
|
ret = copy_to_user(uru, &ru, sizeof(ru));
|
|
else
|
|
ret = put_compat_rusage(&ru, uru);
|
|
if (ret)
|
|
return -EFAULT;
|
|
}
|
|
|
|
BUG_ON(info.si_code & __SI_MASK);
|
|
info.si_code |= __SI_CHLD;
|
|
return copy_siginfo_to_user32(uinfo, &info);
|
|
}
|
|
|
|
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) {
|
|
size_t retlen = min_t(size_t, 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;
|
|
}
|
|
|
|
int get_compat_itimerspec(struct itimerspec *dst,
|
|
const struct compat_itimerspec __user *src)
|
|
{
|
|
if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
|
|
__compat_get_timespec(&dst->it_value, &src->it_value))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
int put_compat_itimerspec(struct compat_itimerspec __user *dst,
|
|
const struct itimerspec *src)
|
|
{
|
|
if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
|
|
__compat_put_timespec(&src->it_value, &dst->it_value))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
|
|
struct compat_sigevent __user *, timer_event_spec,
|
|
timer_t __user *, created_timer_id)
|
|
{
|
|
struct sigevent __user *event = NULL;
|
|
|
|
if (timer_event_spec) {
|
|
struct sigevent kevent;
|
|
|
|
event = compat_alloc_user_space(sizeof(*event));
|
|
if (get_compat_sigevent(&kevent, timer_event_spec) ||
|
|
copy_to_user(event, &kevent, sizeof(*event)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
return sys_timer_create(which_clock, event, created_timer_id);
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
|
|
struct compat_itimerspec __user *, new,
|
|
struct compat_itimerspec __user *, old)
|
|
{
|
|
long err;
|
|
mm_segment_t oldfs;
|
|
struct itimerspec newts, oldts;
|
|
|
|
if (!new)
|
|
return -EINVAL;
|
|
if (get_compat_itimerspec(&newts, new))
|
|
return -EFAULT;
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
err = sys_timer_settime(timer_id, flags,
|
|
(struct itimerspec __user *) &newts,
|
|
(struct itimerspec __user *) &oldts);
|
|
set_fs(oldfs);
|
|
if (!err && old && put_compat_itimerspec(old, &oldts))
|
|
return -EFAULT;
|
|
return err;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
|
|
struct compat_itimerspec __user *, setting)
|
|
{
|
|
long err;
|
|
mm_segment_t oldfs;
|
|
struct itimerspec ts;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
err = sys_timer_gettime(timer_id,
|
|
(struct itimerspec __user *) &ts);
|
|
set_fs(oldfs);
|
|
if (!err && put_compat_itimerspec(setting, &ts))
|
|
return -EFAULT;
|
|
return err;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
|
|
struct compat_timespec __user *, tp)
|
|
{
|
|
long err;
|
|
mm_segment_t oldfs;
|
|
struct timespec ts;
|
|
|
|
if (compat_get_timespec(&ts, tp))
|
|
return -EFAULT;
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
err = sys_clock_settime(which_clock,
|
|
(struct timespec __user *) &ts);
|
|
set_fs(oldfs);
|
|
return err;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
|
|
struct compat_timespec __user *, tp)
|
|
{
|
|
long err;
|
|
mm_segment_t oldfs;
|
|
struct timespec ts;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
err = sys_clock_gettime(which_clock,
|
|
(struct timespec __user *) &ts);
|
|
set_fs(oldfs);
|
|
if (!err && compat_put_timespec(&ts, tp))
|
|
return -EFAULT;
|
|
return err;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
|
|
struct compat_timex __user *, utp)
|
|
{
|
|
struct timex txc;
|
|
mm_segment_t oldfs;
|
|
int err, ret;
|
|
|
|
err = compat_get_timex(&txc, utp);
|
|
if (err)
|
|
return err;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
|
|
set_fs(oldfs);
|
|
|
|
err = compat_put_timex(utp, &txc);
|
|
if (err)
|
|
return err;
|
|
|
|
return ret;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
|
|
struct compat_timespec __user *, tp)
|
|
{
|
|
long err;
|
|
mm_segment_t oldfs;
|
|
struct timespec ts;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
err = sys_clock_getres(which_clock,
|
|
(struct timespec __user *) &ts);
|
|
set_fs(oldfs);
|
|
if (!err && tp && compat_put_timespec(&ts, tp))
|
|
return -EFAULT;
|
|
return err;
|
|
}
|
|
|
|
static long compat_clock_nanosleep_restart(struct restart_block *restart)
|
|
{
|
|
long err;
|
|
mm_segment_t oldfs;
|
|
struct timespec tu;
|
|
struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp;
|
|
|
|
restart->nanosleep.rmtp = (struct timespec __user *) &tu;
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
err = clock_nanosleep_restart(restart);
|
|
set_fs(oldfs);
|
|
|
|
if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
|
|
compat_put_timespec(&tu, rmtp))
|
|
return -EFAULT;
|
|
|
|
if (err == -ERESTART_RESTARTBLOCK) {
|
|
restart->fn = compat_clock_nanosleep_restart;
|
|
restart->nanosleep.compat_rmtp = rmtp;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
|
|
struct compat_timespec __user *, rqtp,
|
|
struct compat_timespec __user *, rmtp)
|
|
{
|
|
long err;
|
|
mm_segment_t oldfs;
|
|
struct timespec in, out;
|
|
struct restart_block *restart;
|
|
|
|
if (compat_get_timespec(&in, rqtp))
|
|
return -EFAULT;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
err = sys_clock_nanosleep(which_clock, flags,
|
|
(struct timespec __user *) &in,
|
|
(struct timespec __user *) &out);
|
|
set_fs(oldfs);
|
|
|
|
if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
|
|
compat_put_timespec(&out, rmtp))
|
|
return -EFAULT;
|
|
|
|
if (err == -ERESTART_RESTARTBLOCK) {
|
|
restart = ¤t->restart_block;
|
|
restart->fn = compat_clock_nanosleep_restart;
|
|
restart->nanosleep.compat_rmtp = rmtp;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
int i, j;
|
|
unsigned long m;
|
|
compat_ulong_t um;
|
|
unsigned long nr_compat_longs;
|
|
|
|
/* align bitmap up to nearest compat_long_t boundary */
|
|
bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
|
|
|
|
if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
|
|
return -EFAULT;
|
|
|
|
nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
|
|
|
|
for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
|
|
m = 0;
|
|
|
|
for (j = 0; j < sizeof(m)/sizeof(um); j++) {
|
|
/*
|
|
* We dont want to read past the end of the userspace
|
|
* bitmap. We must however ensure the end of the
|
|
* kernel bitmap is zeroed.
|
|
*/
|
|
if (nr_compat_longs-- > 0) {
|
|
if (__get_user(um, umask))
|
|
return -EFAULT;
|
|
} else {
|
|
um = 0;
|
|
}
|
|
|
|
umask++;
|
|
m |= (long)um << (j * BITS_PER_COMPAT_LONG);
|
|
}
|
|
*mask++ = m;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
|
|
unsigned long bitmap_size)
|
|
{
|
|
int i, j;
|
|
unsigned long m;
|
|
compat_ulong_t um;
|
|
unsigned long nr_compat_longs;
|
|
|
|
/* align bitmap up to nearest compat_long_t boundary */
|
|
bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
|
|
|
|
if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
|
|
return -EFAULT;
|
|
|
|
nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
|
|
|
|
for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
|
|
m = *mask++;
|
|
|
|
for (j = 0; j < sizeof(m)/sizeof(um); j++) {
|
|
um = m;
|
|
|
|
/*
|
|
* We dont want to write past the end of the userspace
|
|
* bitmap.
|
|
*/
|
|
if (nr_compat_longs-- > 0) {
|
|
if (__put_user(um, umask))
|
|
return -EFAULT;
|
|
}
|
|
|
|
umask++;
|
|
m >>= 4*sizeof(um);
|
|
m >>= 4*sizeof(um);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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];
|
|
}
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
|
|
struct compat_siginfo __user *, uinfo,
|
|
struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
|
|
{
|
|
compat_sigset_t s32;
|
|
sigset_t s;
|
|
struct timespec t;
|
|
siginfo_t info;
|
|
long ret;
|
|
|
|
if (sigsetsize != sizeof(sigset_t))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
|
|
return -EFAULT;
|
|
sigset_from_compat(&s, &s32);
|
|
|
|
if (uts) {
|
|
if (compat_get_timespec(&t, uts))
|
|
return -EFAULT;
|
|
}
|
|
|
|
ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
|
|
|
|
if (ret > 0 && uinfo) {
|
|
if (copy_siginfo_to_user32(uinfo, &info))
|
|
ret = -EFAULT;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef __ARCH_WANT_COMPAT_SYS_TIME
|
|
|
|
/* compat_time_t is a 32 bit "long" and needs to get converted. */
|
|
|
|
COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc)
|
|
{
|
|
compat_time_t i;
|
|
struct timeval tv;
|
|
|
|
do_gettimeofday(&tv);
|
|
i = tv.tv_sec;
|
|
|
|
if (tloc) {
|
|
if (put_user(i,tloc))
|
|
return -EFAULT;
|
|
}
|
|
force_successful_syscall_return();
|
|
return i;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr)
|
|
{
|
|
struct timespec tv;
|
|
int err;
|
|
|
|
if (get_user(tv.tv_sec, tptr))
|
|
return -EFAULT;
|
|
|
|
tv.tv_nsec = 0;
|
|
|
|
err = security_settime(&tv, NULL);
|
|
if (err)
|
|
return err;
|
|
|
|
do_settimeofday(&tv);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
|
|
|
|
COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp)
|
|
{
|
|
struct timex txc;
|
|
int err, ret;
|
|
|
|
err = compat_get_timex(&txc, utp);
|
|
if (err)
|
|
return err;
|
|
|
|
ret = do_adjtimex(&txc);
|
|
|
|
err = compat_put_timex(utp, &txc);
|
|
if (err)
|
|
return err;
|
|
|
|
return ret;
|
|
}
|
|
|
|
#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);
|