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![Arnd Bergmann](/assets/img/avatar_default.png)
The structure is only used in one place, moving it there simplifies the interface and helps with later changes to this code. Rename it to match the other time32 structures in the process. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
356 lines
9.2 KiB
C
356 lines
9.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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/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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static int __compat_get_timeval(struct timeval *tv, const struct old_timeval32 __user *ctv)
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{
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return (!access_ok(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 old_timeval32 __user *ctv)
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{
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return (!access_ok(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 old_timespec32 __user *cts)
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{
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return (!access_ok(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 old_timespec32 __user *cts)
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{
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return (!access_ok(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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#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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unsigned int retlen = min(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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/*
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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(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 (!user_access_begin(umask, bitmap_size / 8))
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return -EFAULT;
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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,
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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 (!user_access_begin(umask, bitmap_size / 8))
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return -EFAULT;
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while (nr_compat_longs > 1) {
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unsigned long m = *mask++;
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unsafe_put_user((compat_ulong_t)m, umask++, Efault);
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unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault);
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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_put_user((compat_ulong_t)*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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int
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get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat)
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{
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#ifdef __BIG_ENDIAN
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compat_sigset_t v;
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if (copy_from_user(&v, compat, sizeof(compat_sigset_t)))
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return -EFAULT;
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switch (_NSIG_WORDS) {
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case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 );
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/* fall through */
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case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 );
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/* fall through */
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case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 );
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/* fall through */
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case 1: set->sig[0] = v.sig[0] | (((long)v.sig[1]) << 32 );
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}
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#else
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if (copy_from_user(set, compat, sizeof(compat_sigset_t)))
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return -EFAULT;
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#endif
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return 0;
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}
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EXPORT_SYMBOL_GPL(get_compat_sigset);
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/*
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* Allocate user-space memory for the duration of a single system call,
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* in order to marshall parameters inside a compat thunk.
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*/
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void __user *compat_alloc_user_space(unsigned long len)
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{
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void __user *ptr;
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/* If len would occupy more than half of the entire compat space... */
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if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
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return NULL;
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ptr = arch_compat_alloc_user_space(len);
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if (unlikely(!access_ok(ptr, len)))
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return NULL;
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return ptr;
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}
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EXPORT_SYMBOL_GPL(compat_alloc_user_space);
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