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linux/arch/s390/kernel/compat_linux.c
Paul Gortmaker 3994a52b54 s390: kernel: Audit and remove any unnecessary uses of module.h 
Historically a lot of these existed because we did not have
a distinction between what was modular code and what was providing
support to modules via EXPORT_SYMBOL and friends.  That changed
when we forked out support for the latter into the export.h file.

This means we should be able to reduce the usage of module.h
in code that is obj-y Makefile or bool Kconfig.  The advantage
in doing so is that module.h itself sources about 15 other headers;
adding significantly to what we feed cpp, and it can obscure what
headers we are effectively using.

Since module.h was the source for init.h (for __init) and for
export.h (for EXPORT_SYMBOL) we consider each change instance
for the presence of either and replace as needed.  Build testing
revealed some implicit header usage that was fixed up accordingly.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-02-17 07:40:31 +01:00

520 lines
13 KiB
C
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/*
* 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_SYSVIPC
COMPAT_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)
a.advice = POSIX_FADV_DONTNEED;
else if (a.advice == 5)
a.advice = POSIX_FADV_NOREUSE;
return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
}
COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
u32, nhigh, u32, nlow, unsigned int, flags)
{
return sys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
((u64)nhigh << 32) + nlow, flags);
}
COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
u32, lenhigh, u32, lenlow)
{
return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
((u64)lenhigh << 32) + lenlow);
}
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