sparc/kernel/sys_sparc32.c

// SPDX-License-Identifier: GPL-2.0
/* sys_sparc32.c: Conversion between 32bit and 64bit native syscalls.
 *
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997, 2007 David S. Miller (davem@davemloft.net)
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * environment.
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/file.h>
#include <linux/signal.h>
#include <linux/resource.h>
#include <linux/times.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/uio.h>
#include <linux/quota.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/filter.h>
#include <linux/highmem.h>
#include <linux/highuid.h>
#include <linux/mman.h>
#include <linux/ipv6.h>
#include <linux/in.h>
#include <linux/icmpv6.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/binfmts.h>
#include <linux/dnotify.h>
#include <linux/security.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/slab.h>

#include <asm/types.h>
#include <linux/uaccess.h>
#include <asm/fpumacro.h>
#include <asm/mmu_context.h>
#include <asm/compat_signal.h>

#include "systbls.h"

COMPAT_SYSCALL_DEFINE3(truncate64, const char __user *, path, u32, high, u32, low)
{
	return ksys_truncate(path, ((u64)high << 32) | low);
}

COMPAT_SYSCALL_DEFINE3(ftruncate64, unsigned int, fd, u32, high, u32, low)
{
	return ksys_ftruncate(fd, ((u64)high << 32) | low);
}

static int cp_compat_stat64(struct kstat *stat,
			    struct compat_stat64 __user *statbuf)
{
	int err;

	err  = put_user(huge_encode_dev(stat->dev), &statbuf->st_dev);
	err |= put_user(stat->ino, &statbuf->st_ino);
	err |= put_user(stat->mode, &statbuf->st_mode);
	err |= put_user(stat->nlink, &statbuf->st_nlink);
	err |= put_user(from_kuid_munged(current_user_ns(), stat->uid), &statbuf->st_uid);
	err |= put_user(from_kgid_munged(current_user_ns(), stat->gid), &statbuf->st_gid);
	err |= put_user(huge_encode_dev(stat->rdev), &statbuf->st_rdev);
	err |= put_user(0, (unsigned long __user *) &statbuf->__pad3[0]);
	err |= put_user(stat->size, &statbuf->st_size);
	err |= put_user(stat->blksize, &statbuf->st_blksize);
	err |= put_user(0, (unsigned int __user *) &statbuf->__pad4[0]);
	err |= put_user(0, (unsigned int __user *) &statbuf->__pad4[4]);
	err |= put_user(stat->blocks, &statbuf->st_blocks);
	err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
	err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
	err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
	err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
	err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
	err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
	err |= put_user(0, &statbuf->__unused4);
	err |= put_user(0, &statbuf->__unused5);

	return err;
}

COMPAT_SYSCALL_DEFINE2(stat64, const char __user *, filename,
		struct compat_stat64 __user *, statbuf)
{
	struct kstat stat;
	int error = vfs_stat(filename, &stat);

	if (!error)
		error = cp_compat_stat64(&stat, statbuf);
	return error;
}

COMPAT_SYSCALL_DEFINE2(lstat64, const char __user *, filename,
		struct compat_stat64 __user *, statbuf)
{
	struct kstat stat;
	int error = vfs_lstat(filename, &stat);

	if (!error)
		error = cp_compat_stat64(&stat, statbuf);
	return error;
}

COMPAT_SYSCALL_DEFINE2(fstat64, unsigned int, fd,
		struct compat_stat64 __user *, statbuf)
{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);

	if (!error)
		error = cp_compat_stat64(&stat, statbuf);
	return error;
}

COMPAT_SYSCALL_DEFINE4(fstatat64, unsigned int, dfd,
		const char __user *, filename,
		struct compat_stat64 __user *, statbuf, int, flag)
{
	struct kstat stat;
	int error;

	error = vfs_fstatat(dfd, filename, &stat, flag);
	if (error)
		return error;
	return cp_compat_stat64(&stat, statbuf);
}

COMPAT_SYSCALL_DEFINE3(sparc_sigaction, int, sig,
			struct compat_old_sigaction __user *,act,
			struct compat_old_sigaction __user *,oact)
{
	WARN_ON_ONCE(sig >= 0);
	return compat_sys_sigaction(-sig, act, oact);
}

COMPAT_SYSCALL_DEFINE5(rt_sigaction, int, sig,
			struct compat_sigaction __user *,act,
			struct compat_sigaction __user *,oact,
			void __user *,restorer,
			compat_size_t,sigsetsize)
{
        struct k_sigaction new_ka, old_ka;
        int ret;

        /* XXX: Don't preclude handling different sized sigset_t's.  */
        if (sigsetsize != sizeof(compat_sigset_t))
                return -EINVAL;

        if (act) {
		u32 u_handler, u_restorer;

		new_ka.ka_restorer = restorer;
		ret = get_user(u_handler, &act->sa_handler);
		new_ka.sa.sa_handler =  compat_ptr(u_handler);
		ret |= get_compat_sigset(&new_ka.sa.sa_mask, &act->sa_mask);
		ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
		ret |= get_user(u_restorer, &act->sa_restorer);
		new_ka.sa.sa_restorer = compat_ptr(u_restorer);
                if (ret)
                	return -EFAULT;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
		ret |= put_compat_sigset(&oact->sa_mask, &old_ka.sa.sa_mask,
					 sizeof(oact->sa_mask));
		ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
		ret |= put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer);
		if (ret)
			ret = -EFAULT;
        }

        return ret;
}

COMPAT_SYSCALL_DEFINE5(pread64, unsigned int, fd, char __user *, ubuf,
			compat_size_t, count, u32, poshi, u32, poslo)
{
	return ksys_pread64(fd, ubuf, count, ((u64)poshi << 32) | poslo);
}

COMPAT_SYSCALL_DEFINE5(pwrite64, unsigned int, fd, char __user *, ubuf,
			compat_size_t, count, u32, poshi, u32, poslo)
{
	return ksys_pwrite64(fd, ubuf, count, ((u64)poshi << 32) | poslo);
}

COMPAT_SYSCALL_DEFINE4(readahead, int, fd, u32, offhi, u32, offlo,
		     compat_size_t, count)
{
	return ksys_readahead(fd, ((u64)offhi << 32) | offlo, count);
}

COMPAT_SYSCALL_DEFINE5(fadvise64, int, fd, u32, offhi, u32, offlo,
			  compat_size_t, len, int, advice)
{
	return ksys_fadvise64_64(fd, ((u64)offhi << 32) | offlo, len, advice);
}

COMPAT_SYSCALL_DEFINE6(fadvise64_64, int, fd, u32, offhi, u32, offlo,
			     u32, lenhi, u32, lenlo, int, advice)
{
	return ksys_fadvise64_64(fd,
				 ((u64)offhi << 32) | offlo,
				 ((u64)lenhi << 32) | lenlo,
				 advice);
}

COMPAT_SYSCALL_DEFINE6(sync_file_range, unsigned int, fd, u32, off_high, u32, off_low,
			u32, nb_high, u32, nb_low, unsigned int, flags)
{
	return ksys_sync_file_range(fd,
				    ((u64)off_high << 32) | off_low,
				    ((u64)nb_high << 32) | nb_low,
				    flags);
}

COMPAT_SYSCALL_DEFINE6(fallocate, int, fd, int, mode, u32, offhi, u32, offlo,
				     u32, lenhi, u32, lenlo)
{
	return ksys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
			      ((loff_t)lenhi << 32) | lenlo);
}