/* *  S390 version *    Copyright IBM Corp. 2000 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), *               Gerhard Tonn (ton@de.ibm.com)    *               Thomas Spatzier (tspat@de.ibm.com) * *  Conversion between 31bit and 64bit native syscalls. * * Heavily inspired by the 32-bit Sparc compat code which is  * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) * */  #include <linux/kernel.h>#include <linux/sched.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/capability.h>#include <linux/compat.h>#include <linux/vfs.h>#include <linux/ptrace.h>#include <linux/fadvise.h>#include <linux/ipc.h>#include <linux/slab.h> #include <asm/types.h>#include <linux/uaccess.h> #include <net/scm.h>#include <net/sock.h> #include "compat_linux.h" /* For this source file, we want overflow handling. */ #undef high2lowuid#undef high2lowgid#undef low2highuid#undef low2highgid#undef SET_UID16#undef SET_GID16#undef NEW_TO_OLD_UID#undef NEW_TO_OLD_GID#undef SET_OLDSTAT_UID#undef SET_OLDSTAT_GID#undef SET_STAT_UID#undef SET_STAT_GID #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)#define SET_UID16(var, uid)	var = high2lowuid(uid)#define SET_GID16(var, gid)	var = high2lowgid(gid)#define NEW_TO_OLD_UID(uid)	high2lowuid(uid)#define NEW_TO_OLD_GID(gid)	high2lowgid(gid)#define SET_OLDSTAT_UID(stat, uid)	(stat).st_uid = high2lowuid(uid)#define SET_OLDSTAT_GID(stat, gid)	(stat).st_gid = high2lowgid(gid)#define SET_STAT_UID(stat, uid)		(stat).st_uid = high2lowuid(uid)#define SET_STAT_GID(stat, gid)		(stat).st_gid = high2lowgid(gid) COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename,		       u16, user, u16, group){	return sys_chown(filename, low2highuid(user), low2highgid(group));} COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *,		       filename, u16, user, u16, group){	return sys_lchown(filename, low2highuid(user), low2highgid(group));} COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group){	return sys_fchown(fd, low2highuid(user), low2highgid(group));} COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid){	return sys_setregid(low2highgid(rgid), low2highgid(egid));} COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid){	return sys_setgid((gid_t)gid);} COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid){	return sys_setreuid(low2highuid(ruid), low2highuid(euid));} COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid){	return sys_setuid((uid_t)uid);} COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid){	return sys_setresuid(low2highuid(ruid), low2highuid(euid),			     low2highuid(suid));} COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp,		       u16 __user *, euidp, u16 __user *, suidp){	const struct cred *cred = current_cred();	int retval;	u16 ruid, euid, suid; 	ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));	euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));	suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid)); 	if (!(retval   = put_user(ruid, ruidp)) &&	    !(retval   = put_user(euid, euidp)))		retval = put_user(suid, suidp); 	return retval;} COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid){	return sys_setresgid(low2highgid(rgid), low2highgid(egid),			     low2highgid(sgid));} COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp,		       u16 __user *, egidp, u16 __user *, sgidp){	const struct cred *cred = current_cred();	int retval;	u16 rgid, egid, sgid; 	rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));	egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));	sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid)); 	if (!(retval   = put_user(rgid, rgidp)) &&	    !(retval   = put_user(egid, egidp)))		retval = put_user(sgid, sgidp); 	return retval;} COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid){	return sys_setfsuid((uid_t)uid);} COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid){	return sys_setfsgid((gid_t)gid);} static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info){	struct user_namespace *user_ns = current_user_ns();	int i;	u16 group;	kgid_t kgid; 	for (i = 0; i < group_info->ngroups; i++) {		kgid = group_info->gid[i];		group = (u16)from_kgid_munged(user_ns, kgid);		if (put_user(group, grouplist+i))			return -EFAULT;	} 	return 0;} static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist){	struct user_namespace *user_ns = current_user_ns();	int i;	u16 group;	kgid_t kgid; 	for (i = 0; i < group_info->ngroups; i++) {		if (get_user(group, grouplist+i))			return  -EFAULT; 		kgid = make_kgid(user_ns, (gid_t)group);		if (!gid_valid(kgid))			return -EINVAL; 		group_info->gid[i] = kgid;	} 	return 0;} COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist){	const struct cred *cred = current_cred();	int i; 	if (gidsetsize < 0)		return -EINVAL; 	get_group_info(cred->group_info);	i = cred->group_info->ngroups;	if (gidsetsize) {		if (i > gidsetsize) {			i = -EINVAL;			goto out;		}		if (groups16_to_user(grouplist, cred->group_info)) {			i = -EFAULT;			goto out;		}	}out:	put_group_info(cred->group_info);	return i;} COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist){	struct group_info *group_info;	int retval; 	if (!may_setgroups())		return -EPERM;	if ((unsigned)gidsetsize > NGROUPS_MAX)		return -EINVAL; 	group_info = groups_alloc(gidsetsize);	if (!group_info)		return -ENOMEM;	retval = groups16_from_user(group_info, grouplist);	if (retval) {		put_group_info(group_info);		return retval;	} 	retval = set_current_groups(group_info);	put_group_info(group_info); 	return retval;} COMPAT_SYSCALL_DEFINE0(s390_getuid16){	return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));} COMPAT_SYSCALL_DEFINE0(s390_geteuid16){	return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));} COMPAT_SYSCALL_DEFINE0(s390_getgid16){	return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));} COMPAT_SYSCALL_DEFINE0(s390_getegid16){	return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));} #ifdef CONFIG_SYSVIPCCOMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,		compat_ulong_t, third, compat_uptr_t, ptr){	if (call >> 16)		/* hack for backward compatibility */		return -EINVAL;	return compat_sys_ipc(call, first, second, third, ptr, third);}#endif COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low){	return sys_truncate(path, (unsigned long)high << 32 | low);} COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low){	return sys_ftruncate(fd, (unsigned long)high << 32 | low);} COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,		       compat_size_t, count, u32, high, u32, low){	if ((compat_ssize_t) count < 0)		return -EINVAL;	return sys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low);} COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,		       compat_size_t, count, u32, high, u32, low){	if ((compat_ssize_t) count < 0)		return -EINVAL;	return sys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low);} COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count){	return sys_readahead(fd, (unsigned long)high << 32 | low, count);} struct stat64_emu31 {	unsigned long long  st_dev;	unsigned int    __pad1;#define STAT64_HAS_BROKEN_ST_INO        1	u32             __st_ino;	unsigned int    st_mode;	unsigned int    st_nlink;	u32             st_uid;	u32             st_gid;	unsigned long long  st_rdev;	unsigned int    __pad3;	long            st_size;	u32             st_blksize;	unsigned char   __pad4[4];	u32             __pad5;     /* future possible st_blocks high bits */	u32             st_blocks;  /* Number 512-byte blocks allocated. */	u32             st_atime;	u32             __pad6;	u32             st_mtime;	u32             __pad7;	u32             st_ctime;	u32             __pad8;     /* will be high 32 bits of ctime someday */	unsigned long   st_ino;};	 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat){	struct stat64_emu31 tmp; 	memset(&tmp, 0, sizeof(tmp)); 	tmp.st_dev = huge_encode_dev(stat->dev);	tmp.st_ino = stat->ino;	tmp.__st_ino = (u32)stat->ino;	tmp.st_mode = stat->mode;	tmp.st_nlink = (unsigned int)stat->nlink;	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);	tmp.st_rdev = huge_encode_dev(stat->rdev);	tmp.st_size = stat->size;	tmp.st_blksize = (u32)stat->blksize;	tmp.st_blocks = (u32)stat->blocks;	tmp.st_atime = (u32)stat->atime.tv_sec;	tmp.st_mtime = (u32)stat->mtime.tv_sec;	tmp.st_ctime = (u32)stat->ctime.tv_sec; 	return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; } COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf){	struct kstat stat;	int ret = vfs_stat(filename, &stat);	if (!ret)		ret = cp_stat64(statbuf, &stat);	return ret;} COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf){	struct kstat stat;	int ret = vfs_lstat(filename, &stat);	if (!ret)		ret = cp_stat64(statbuf, &stat);	return ret;} COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf){	struct kstat stat;	int ret = vfs_fstat(fd, &stat);	if (!ret)		ret = cp_stat64(statbuf, &stat);	return ret;} COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,		       struct stat64_emu31 __user *, statbuf, int, flag){	struct kstat stat;	int error; 	error = vfs_fstatat(dfd, filename, &stat, flag);	if (error)		return error;	return cp_stat64(statbuf, &stat);} /* * Linux/i386 didn't use to be able to handle more than * 4 system call parameters, so these system calls used a memory * block for parameter passing.. */ struct mmap_arg_struct_emu31 {	compat_ulong_t addr;	compat_ulong_t len;	compat_ulong_t prot;	compat_ulong_t flags;	compat_ulong_t fd;	compat_ulong_t offset;}; COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg){	struct mmap_arg_struct_emu31 a; 	if (copy_from_user(&a, arg, sizeof(a)))		return -EFAULT;	if (a.offset & ~PAGE_MASK)		return -EINVAL;	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,			      a.offset >> PAGE_SHIFT);} COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg){	struct mmap_arg_struct_emu31 a; 	if (copy_from_user(&a, arg, sizeof(a)))		return -EFAULT;	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);} COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count){	if ((compat_ssize_t) count < 0)		return -EINVAL;  	return sys_read(fd, buf, count);} COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count){	if ((compat_ssize_t) count < 0)		return -EINVAL;  	return sys_write(fd, buf, count);} /* * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} * because the 31 bit values differ from the 64 bit values. */ COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise){	if (advise == 4)		advise = POSIX_FADV_DONTNEED;	else if (advise == 5)		advise = POSIX_FADV_NOREUSE;	return sys_fadvise64(fd, (unsigned long)high << 32 | low, len, advise);} struct fadvise64_64_args {	int fd;	long long offset;	long long len;	int advice;}; COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args){	struct fadvise64_64_args a; 	if ( copy_from_user(&a, args, sizeof(a)) )		return -EFAULT;	if (a.advice == 4)

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