/* *  arch/s390x/kernel/linux32.c * *  S390 version *    Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation *    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/module.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 <asm/uaccess.h> #include <net/scm.h>#include <net/sock.h> #include "compat_linux.h" u32 psw32_user_bits = PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT |		      PSW32_DEFAULT_KEY | PSW32_MASK_BASE | PSW32_MASK_MCHECK |		      PSW32_MASK_PSTATE | PSW32_ASC_HOME; /* 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) asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group){	return sys_chown(filename, low2highuid(user), low2highgid(group));} asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group){	return sys_lchown(filename, low2highuid(user), low2highgid(group));} asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group){	return sys_fchown(fd, low2highuid(user), low2highgid(group));} asmlinkage long sys32_setregid16(u16 rgid, u16 egid){	return sys_setregid(low2highgid(rgid), low2highgid(egid));} asmlinkage long sys32_setgid16(u16 gid){	return sys_setgid((gid_t)gid);} asmlinkage long sys32_setreuid16(u16 ruid, u16 euid){	return sys_setreuid(low2highuid(ruid), low2highuid(euid));} asmlinkage long sys32_setuid16(u16 uid){	return sys_setuid((uid_t)uid);} asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid){	return sys_setresuid(low2highuid(ruid), low2highuid(euid),		low2highuid(suid));} asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid){	int retval; 	if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&	    !(retval = put_user(high2lowuid(current->cred->euid), euid)))		retval = put_user(high2lowuid(current->cred->suid), suid); 	return retval;} asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid){	return sys_setresgid(low2highgid(rgid), low2highgid(egid),		low2highgid(sgid));} asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid){	int retval; 	if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&	    !(retval = put_user(high2lowgid(current->cred->egid), egid)))		retval = put_user(high2lowgid(current->cred->sgid), sgid); 	return retval;} asmlinkage long sys32_setfsuid16(u16 uid){	return sys_setfsuid((uid_t)uid);} asmlinkage long sys32_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_AT(group_info, 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_AT(group_info, i) = kgid;	} 	return 0;} asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist){	int i; 	if (gidsetsize < 0)		return -EINVAL; 	get_group_info(current->cred->group_info);	i = current->cred->group_info->ngroups;	if (gidsetsize) {		if (i > gidsetsize) {			i = -EINVAL;			goto out;		}		if (groups16_to_user(grouplist, current->cred->group_info)) {			i = -EFAULT;			goto out;		}	}out:	put_group_info(current->cred->group_info);	return i;} asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist){	struct group_info *group_info;	int retval; 	if (!capable(CAP_SETGID))		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;} asmlinkage long sys32_getuid16(void){	return high2lowuid(current->cred->uid);} asmlinkage long sys32_geteuid16(void){	return high2lowuid(current->cred->euid);} asmlinkage long sys32_getgid16(void){	return high2lowgid(current->cred->gid);} asmlinkage long sys32_getegid16(void){	return high2lowgid(current->cred->egid);} /* * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation. * * This is really horribly ugly. */#ifdef CONFIG_SYSVIPCasmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr){	if (call >> 16)		/* hack for backward compatibility */		return -EINVAL;	switch (call) {	case SEMTIMEDOP:		return compat_sys_semtimedop(first, compat_ptr(ptr),					     second, compat_ptr(third));	case SEMOP:		/* struct sembuf is the same on 32 and 64bit :)) */		return sys_semtimedop(first, compat_ptr(ptr),				      second, NULL);	case SEMGET:		return sys_semget(first, second, third);	case SEMCTL:		return compat_sys_semctl(first, second, third,					 compat_ptr(ptr));	case MSGSND:		return compat_sys_msgsnd(first, second, third,					 compat_ptr(ptr));	case MSGRCV:		return compat_sys_msgrcv(first, second, 0, third,					 0, compat_ptr(ptr));	case MSGGET:		return sys_msgget((key_t) first, second);	case MSGCTL:		return compat_sys_msgctl(first, second, compat_ptr(ptr));	case SHMAT:		return compat_sys_shmat(first, second, third,					0, compat_ptr(ptr));	case SHMDT:		return sys_shmdt(compat_ptr(ptr));	case SHMGET:		return sys_shmget(first, (unsigned)second, third);	case SHMCTL:		return compat_sys_shmctl(first, second, compat_ptr(ptr));	} 	return -ENOSYS;}#endif asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low){	if ((int)high < 0)		return -EINVAL;	else		return sys_truncate(path, (high << 32) | low);} asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low){	if ((int)high < 0)		return -EINVAL;	else		return sys_ftruncate(fd, (high << 32) | low);} asmlinkage long sys32_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 __force __user *) &t);	set_fs (old_fs);	if (put_compat_timespec(&t, interval))		return -EFAULT;	return ret;} asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,			compat_sigset_t __user *oset, size_t sigsetsize){	sigset_t s;	compat_sigset_t s32;	int ret;	mm_segment_t old_fs = get_fs();		if (set) {		if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))			return -EFAULT;		s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);	}	set_fs (KERNEL_DS);	ret = sys_rt_sigprocmask(how,				 set ? (sigset_t __force __user *) &s : NULL,				 oset ? (sigset_t __force __user *) &s : NULL,				 sigsetsize);	set_fs (old_fs);	if (ret) return ret;	if (oset) {		s32.sig[1] = (s.sig[0] >> 32);		s32.sig[0] = s.sig[0];		if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))			return -EFAULT;	}	return 0;} asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,				size_t sigsetsize){	sigset_t s;	compat_sigset_t s32;	int ret;	mm_segment_t old_fs = get_fs();			set_fs (KERNEL_DS);	ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);	set_fs (old_fs);	if (!ret) {		s32.sig[1] = (s.sig[0] >> 32);		s32.sig[0] = s.sig[0];		if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))			return -EFAULT;	}	return ret;} asmlinkage longsys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo){	siginfo_t info;	int ret;	mm_segment_t old_fs = get_fs();		if (copy_siginfo_from_user32(&info, uinfo))		return -EFAULT;	set_fs (KERNEL_DS);	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);	set_fs (old_fs);	return ret;} /* * sys32_execve() executes a new program after the asm stub has set * things up for us.  This should basically do what I want it to. */asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,			     compat_uptr_t __user *envp){	struct pt_regs *regs = task_pt_regs(current);	char *filename;	long rc; 	filename = getname(name);	rc = PTR_ERR(filename);	if (IS_ERR(filename))		return rc;	rc = compat_do_execve(filename, argv, envp, regs);	if (rc)		goto out;	current->thread.fp_regs.fpc=0;	asm volatile("sfpc %0,0" : : "d" (0));	rc = regs->gprs[2];out:	putname(filename);	return rc;} asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,				size_t count, u32 poshi, u32 poslo){	if ((compat_ssize_t) count < 0)		return -EINVAL;	return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));} asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,				size_t count, u32 poshi, u32 poslo){	if ((compat_ssize_t) count < 0)		return -EINVAL;	return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));} asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count){	return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);} asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count){	mm_segment_t old_fs = get_fs();	int ret;	off_t of;		if (offset && get_user(of, offset))		return -EFAULT;			set_fs(KERNEL_DS);	ret = sys_sendfile(out_fd, in_fd,			   offset ? (off_t __force __user *) &of : NULL, count);	set_fs(old_fs);		if (offset && put_user(of, offset))		return -EFAULT;			return ret;} asmlinkage long sys32_sendfile64(int out_fd, int in_fd,				compat_loff_t __user *offset, s32 count){	mm_segment_t old_fs = get_fs();	int ret;	loff_t lof;		if (offset && get_user(lof, offset))		return -EFAULT;

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