3 * Copyright IBM Corp. 2000
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
5 * Gerhard Tonn (ton@de.ibm.com)
6 * Thomas Spatzier (tspat@de.ibm.com)
8 * Conversion between 31bit and 64bit native syscalls.
10 * Heavily inspired by the 32-bit Sparc compat code which is
11 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
12 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
17 #include <linux/kernel.h>
18 #include <linux/sched.h>
21 #include <linux/file.h>
22 #include <linux/signal.h>
23 #include <linux/resource.h>
24 #include <linux/times.h>
25 #include <linux/smp.h>
26 #include <linux/sem.h>
27 #include <linux/msg.h>
28 #include <linux/shm.h>
29 #include <linux/uio.h>
30 #include <linux/quota.h>
31 #include <linux/module.h>
32 #include <linux/poll.h>
33 #include <linux/personality.h>
34 #include <linux/stat.h>
35 #include <linux/filter.h>
36 #include <linux/highmem.h>
37 #include <linux/highuid.h>
38 #include <linux/mman.h>
39 #include <linux/ipv6.h>
41 #include <linux/icmpv6.h>
42 #include <linux/syscalls.h>
43 #include <linux/sysctl.h>
44 #include <linux/binfmts.h>
45 #include <linux/capability.h>
46 #include <linux/compat.h>
47 #include <linux/vfs.h>
48 #include <linux/ptrace.h>
49 #include <linux/fadvise.h>
50 #include <linux/ipc.h>
51 #include <linux/slab.h>
53 #include <asm/types.h>
54 #include <asm/uaccess.h>
59 #include "compat_linux.h"
61 /* For this source file, we want overflow handling. */
71 #undef SET_OLDSTAT_UID
72 #undef SET_OLDSTAT_GID
76 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
77 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
78 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
79 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
80 #define SET_UID16(var, uid) var = high2lowuid(uid)
81 #define SET_GID16(var, gid) var = high2lowgid(gid)
82 #define NEW_TO_OLD_UID(uid) high2lowuid(uid)
83 #define NEW_TO_OLD_GID(gid) high2lowgid(gid)
84 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
85 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
86 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
87 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
89 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
91 return sys_chown(filename, low2highuid(user), low2highgid(group));
94 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
96 return sys_lchown(filename, low2highuid(user), low2highgid(group));
99 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
101 return sys_fchown(fd, low2highuid(user), low2highgid(group));
104 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
106 return sys_setregid(low2highgid(rgid), low2highgid(egid));
109 asmlinkage long sys32_setgid16(u16 gid)
111 return sys_setgid((gid_t)gid);
114 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
116 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
119 asmlinkage long sys32_setuid16(u16 uid)
121 return sys_setuid((uid_t)uid);
124 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
126 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
130 asmlinkage long sys32_getresuid16(u16 __user *ruidp, u16 __user *euidp, u16 __user *suidp)
132 const struct cred *cred = current_cred();
134 u16 ruid, euid, suid;
136 ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
137 euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
138 suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
140 if (!(retval = put_user(ruid, ruidp)) &&
141 !(retval = put_user(euid, euidp)))
142 retval = put_user(suid, suidp);
147 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
149 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
153 asmlinkage long sys32_getresgid16(u16 __user *rgidp, u16 __user *egidp, u16 __user *sgidp)
155 const struct cred *cred = current_cred();
157 u16 rgid, egid, sgid;
159 rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
160 egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
161 sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
163 if (!(retval = put_user(rgid, rgidp)) &&
164 !(retval = put_user(egid, egidp)))
165 retval = put_user(sgid, sgidp);
170 asmlinkage long sys32_setfsuid16(u16 uid)
172 return sys_setfsuid((uid_t)uid);
175 asmlinkage long sys32_setfsgid16(u16 gid)
177 return sys_setfsgid((gid_t)gid);
180 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
182 struct user_namespace *user_ns = current_user_ns();
187 for (i = 0; i < group_info->ngroups; i++) {
188 kgid = GROUP_AT(group_info, i);
189 group = (u16)from_kgid_munged(user_ns, kgid);
190 if (put_user(group, grouplist+i))
197 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
199 struct user_namespace *user_ns = current_user_ns();
204 for (i = 0; i < group_info->ngroups; i++) {
205 if (get_user(group, grouplist+i))
208 kgid = make_kgid(user_ns, (gid_t)group);
209 if (!gid_valid(kgid))
212 GROUP_AT(group_info, i) = kgid;
218 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
220 const struct cred *cred = current_cred();
226 get_group_info(cred->group_info);
227 i = cred->group_info->ngroups;
229 if (i > gidsetsize) {
233 if (groups16_to_user(grouplist, cred->group_info)) {
239 put_group_info(cred->group_info);
243 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
245 struct group_info *group_info;
248 if (!capable(CAP_SETGID))
250 if ((unsigned)gidsetsize > NGROUPS_MAX)
253 group_info = groups_alloc(gidsetsize);
256 retval = groups16_from_user(group_info, grouplist);
258 put_group_info(group_info);
262 retval = set_current_groups(group_info);
263 put_group_info(group_info);
268 asmlinkage long sys32_getuid16(void)
270 return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
273 asmlinkage long sys32_geteuid16(void)
275 return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
278 asmlinkage long sys32_getgid16(void)
280 return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
283 asmlinkage long sys32_getegid16(void)
285 return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
288 #ifdef CONFIG_SYSVIPC
289 COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
290 compat_ulong_t, third, compat_uptr_t, ptr)
292 if (call >> 16) /* hack for backward compatibility */
294 return compat_sys_ipc(call, first, second, third, ptr, third);
298 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
303 return sys_truncate(path, (high << 32) | low);
306 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
311 return sys_ftruncate(fd, (high << 32) | low);
314 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
315 size_t count, u32 poshi, u32 poslo)
317 if ((compat_ssize_t) count < 0)
319 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
322 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
323 size_t count, u32 poshi, u32 poslo)
325 if ((compat_ssize_t) count < 0)
327 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
330 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
332 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
335 struct stat64_emu31 {
336 unsigned long long st_dev;
338 #define STAT64_HAS_BROKEN_ST_INO 1
340 unsigned int st_mode;
341 unsigned int st_nlink;
344 unsigned long long st_rdev;
348 unsigned char __pad4[4];
349 u32 __pad5; /* future possible st_blocks high bits */
350 u32 st_blocks; /* Number 512-byte blocks allocated. */
356 u32 __pad8; /* will be high 32 bits of ctime someday */
357 unsigned long st_ino;
360 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
362 struct stat64_emu31 tmp;
364 memset(&tmp, 0, sizeof(tmp));
366 tmp.st_dev = huge_encode_dev(stat->dev);
367 tmp.st_ino = stat->ino;
368 tmp.__st_ino = (u32)stat->ino;
369 tmp.st_mode = stat->mode;
370 tmp.st_nlink = (unsigned int)stat->nlink;
371 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
372 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
373 tmp.st_rdev = huge_encode_dev(stat->rdev);
374 tmp.st_size = stat->size;
375 tmp.st_blksize = (u32)stat->blksize;
376 tmp.st_blocks = (u32)stat->blocks;
377 tmp.st_atime = (u32)stat->atime.tv_sec;
378 tmp.st_mtime = (u32)stat->mtime.tv_sec;
379 tmp.st_ctime = (u32)stat->ctime.tv_sec;
381 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
384 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
387 int ret = vfs_stat(filename, &stat);
389 ret = cp_stat64(statbuf, &stat);
393 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
396 int ret = vfs_lstat(filename, &stat);
398 ret = cp_stat64(statbuf, &stat);
402 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
405 int ret = vfs_fstat(fd, &stat);
407 ret = cp_stat64(statbuf, &stat);
411 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
412 struct stat64_emu31 __user* statbuf, int flag)
417 error = vfs_fstatat(dfd, filename, &stat, flag);
420 return cp_stat64(statbuf, &stat);
424 * Linux/i386 didn't use to be able to handle more than
425 * 4 system call parameters, so these system calls used a memory
426 * block for parameter passing..
429 struct mmap_arg_struct_emu31 {
433 compat_ulong_t flags;
435 compat_ulong_t offset;
438 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
440 struct mmap_arg_struct_emu31 a;
442 if (copy_from_user(&a, arg, sizeof(a)))
444 if (a.offset & ~PAGE_MASK)
446 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
447 a.offset >> PAGE_SHIFT);
450 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
452 struct mmap_arg_struct_emu31 a;
454 if (copy_from_user(&a, arg, sizeof(a)))
456 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
459 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
461 if ((compat_ssize_t) count < 0)
464 return sys_read(fd, buf, count);
467 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
469 if ((compat_ssize_t) count < 0)
472 return sys_write(fd, buf, count);
476 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
477 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
478 * because the 31 bit values differ from the 64 bit values.
482 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
485 advise = POSIX_FADV_DONTNEED;
486 else if (advise == 5)
487 advise = POSIX_FADV_NOREUSE;
488 return sys_fadvise64(fd, offset, len, advise);
491 struct fadvise64_64_args {
499 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
501 struct fadvise64_64_args a;
503 if ( copy_from_user(&a, args, sizeof(a)) )
506 a.advice = POSIX_FADV_DONTNEED;
507 else if (a.advice == 5)
508 a.advice = POSIX_FADV_NOREUSE;
509 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);