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linux-stable/arch/s390/kernel/compat_linux.c
Heiko Carstens 2ec7f4aec4 s390/compat,uid16: use current_cred() 
86a264ab "CRED: Wrap current->cred and a few other accessors" converted
all uses of current->cred into current_cred() but left s390 alone.

So let's convert s390 finally as well, only five years later.

This way we also get rid of a sparse warning which complains about a
possible invalid rcu dereference which however is a false positive.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2013-09-07 11:58:21 +02:00

514 lines
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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/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 *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;
}
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 *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;
}
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)
{
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;
}
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(from_kuid_munged(current_user_ns(), current_uid()));
}
asmlinkage long sys32_geteuid16(void)
{
return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
}
asmlinkage long sys32_getgid16(void)
{
return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
}
asmlinkage long sys32_getegid16(void)
{
return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
}
#ifdef CONFIG_SYSVIPC
COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
unsigned long, 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
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_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);
}
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;
}
asmlinkage long sys32_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;
}
asmlinkage long sys32_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;
}
asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
{
struct kstat stat;
int ret = vfs_fstat(fd, &stat);
if (!ret)
ret = cp_stat64(statbuf, &stat);
return ret;
}
asmlinkage long sys32_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;
};
asmlinkage unsigned long old32_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);
}
asmlinkage long sys32_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);
}
asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
{
if ((compat_ssize_t) count < 0)
return -EINVAL;
return sys_read(fd, buf, count);
}
asmlinkage long sys32_write(unsigned int fd, const char __user * buf, 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.
*/
asmlinkage long
sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
{
if (advise == 4)
advise = POSIX_FADV_DONTNEED;
else if (advise == 5)
advise = POSIX_FADV_NOREUSE;
return sys_fadvise64(fd, offset, len, advise);
}
struct fadvise64_64_args {
int fd;
long long offset;
long long len;
int advice;
};
asmlinkage long
sys32_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);
}
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