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TOMOYO Linux Cross Reference
Linux/arch/s390/kernel/compat_linux.c

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  1 /*
  2  *  S390 version
  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)
  7  *
  8  *  Conversion between 31bit and 64bit native syscalls.
  9  *
 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)
 13  *
 14  */
 15 
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/sched.h>
 19 #include <linux/fs.h> 
 20 #include <linux/mm.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>
 40 #include <linux/in.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>
 52 
 53 #include <asm/types.h>
 54 #include <asm/uaccess.h>
 55 
 56 #include <net/scm.h>
 57 #include <net/sock.h>
 58 
 59 #include "compat_linux.h"
 60 
 61 /* For this source file, we want overflow handling. */
 62 
 63 #undef high2lowuid
 64 #undef high2lowgid
 65 #undef low2highuid
 66 #undef low2highgid
 67 #undef SET_UID16
 68 #undef SET_GID16
 69 #undef NEW_TO_OLD_UID
 70 #undef NEW_TO_OLD_GID
 71 #undef SET_OLDSTAT_UID
 72 #undef SET_OLDSTAT_GID
 73 #undef SET_STAT_UID
 74 #undef SET_STAT_GID
 75 
 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)
 88 
 89 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
 90 {
 91         return sys_chown(filename, low2highuid(user), low2highgid(group));
 92 }
 93 
 94 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
 95 {
 96         return sys_lchown(filename, low2highuid(user), low2highgid(group));
 97 }
 98 
 99 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
100 {
101         return sys_fchown(fd, low2highuid(user), low2highgid(group));
102 }
103 
104 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
105 {
106         return sys_setregid(low2highgid(rgid), low2highgid(egid));
107 }
108 
109 asmlinkage long sys32_setgid16(u16 gid)
110 {
111         return sys_setgid((gid_t)gid);
112 }
113 
114 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
115 {
116         return sys_setreuid(low2highuid(ruid), low2highuid(euid));
117 }
118 
119 asmlinkage long sys32_setuid16(u16 uid)
120 {
121         return sys_setuid((uid_t)uid);
122 }
123 
124 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
125 {
126         return sys_setresuid(low2highuid(ruid), low2highuid(euid),
127                 low2highuid(suid));
128 }
129 
130 asmlinkage long sys32_getresuid16(u16 __user *ruidp, u16 __user *euidp, u16 __user *suidp)
131 {
132         const struct cred *cred = current_cred();
133         int retval;
134         u16 ruid, euid, suid;
135 
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));
139 
140         if (!(retval   = put_user(ruid, ruidp)) &&
141             !(retval   = put_user(euid, euidp)))
142                 retval = put_user(suid, suidp);
143 
144         return retval;
145 }
146 
147 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
148 {
149         return sys_setresgid(low2highgid(rgid), low2highgid(egid),
150                 low2highgid(sgid));
151 }
152 
153 asmlinkage long sys32_getresgid16(u16 __user *rgidp, u16 __user *egidp, u16 __user *sgidp)
154 {
155         const struct cred *cred = current_cred();
156         int retval;
157         u16 rgid, egid, sgid;
158 
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));
162 
163         if (!(retval   = put_user(rgid, rgidp)) &&
164             !(retval   = put_user(egid, egidp)))
165                 retval = put_user(sgid, sgidp);
166 
167         return retval;
168 }
169 
170 asmlinkage long sys32_setfsuid16(u16 uid)
171 {
172         return sys_setfsuid((uid_t)uid);
173 }
174 
175 asmlinkage long sys32_setfsgid16(u16 gid)
176 {
177         return sys_setfsgid((gid_t)gid);
178 }
179 
180 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
181 {
182         struct user_namespace *user_ns = current_user_ns();
183         int i;
184         u16 group;
185         kgid_t kgid;
186 
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))
191                         return -EFAULT;
192         }
193 
194         return 0;
195 }
196 
197 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
198 {
199         struct user_namespace *user_ns = current_user_ns();
200         int i;
201         u16 group;
202         kgid_t kgid;
203 
204         for (i = 0; i < group_info->ngroups; i++) {
205                 if (get_user(group, grouplist+i))
206                         return  -EFAULT;
207 
208                 kgid = make_kgid(user_ns, (gid_t)group);
209                 if (!gid_valid(kgid))
210                         return -EINVAL;
211 
212                 GROUP_AT(group_info, i) = kgid;
213         }
214 
215         return 0;
216 }
217 
218 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
219 {
220         const struct cred *cred = current_cred();
221         int i;
222 
223         if (gidsetsize < 0)
224                 return -EINVAL;
225 
226         get_group_info(cred->group_info);
227         i = cred->group_info->ngroups;
228         if (gidsetsize) {
229                 if (i > gidsetsize) {
230                         i = -EINVAL;
231                         goto out;
232                 }
233                 if (groups16_to_user(grouplist, cred->group_info)) {
234                         i = -EFAULT;
235                         goto out;
236                 }
237         }
238 out:
239         put_group_info(cred->group_info);
240         return i;
241 }
242 
243 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
244 {
245         struct group_info *group_info;
246         int retval;
247 
248         if (!may_setgroups())
249                 return -EPERM;
250         if ((unsigned)gidsetsize > NGROUPS_MAX)
251                 return -EINVAL;
252 
253         group_info = groups_alloc(gidsetsize);
254         if (!group_info)
255                 return -ENOMEM;
256         retval = groups16_from_user(group_info, grouplist);
257         if (retval) {
258                 put_group_info(group_info);
259                 return retval;
260         }
261 
262         retval = set_current_groups(group_info);
263         put_group_info(group_info);
264 
265         return retval;
266 }
267 
268 asmlinkage long sys32_getuid16(void)
269 {
270         return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
271 }
272 
273 asmlinkage long sys32_geteuid16(void)
274 {
275         return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
276 }
277 
278 asmlinkage long sys32_getgid16(void)
279 {
280         return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
281 }
282 
283 asmlinkage long sys32_getegid16(void)
284 {
285         return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
286 }
287 
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)
291 {
292         if (call >> 16)         /* hack for backward compatibility */
293                 return -EINVAL;
294         return compat_sys_ipc(call, first, second, third, ptr, third);
295 }
296 #endif
297 
298 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
299 {
300         if ((int)high < 0)
301                 return -EINVAL;
302         else
303                 return sys_truncate(path, (high << 32) | low);
304 }
305 
306 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
307 {
308         if ((int)high < 0)
309                 return -EINVAL;
310         else
311                 return sys_ftruncate(fd, (high << 32) | low);
312 }
313 
314 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
315                                 size_t count, u32 poshi, u32 poslo)
316 {
317         if ((compat_ssize_t) count < 0)
318                 return -EINVAL;
319         return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
320 }
321 
322 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
323                                 size_t count, u32 poshi, u32 poslo)
324 {
325         if ((compat_ssize_t) count < 0)
326                 return -EINVAL;
327         return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
328 }
329 
330 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
331 {
332         return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
333 }
334 
335 struct stat64_emu31 {
336         unsigned long long  st_dev;
337         unsigned int    __pad1;
338 #define STAT64_HAS_BROKEN_ST_INO        1
339         u32             __st_ino;
340         unsigned int    st_mode;
341         unsigned int    st_nlink;
342         u32             st_uid;
343         u32             st_gid;
344         unsigned long long  st_rdev;
345         unsigned int    __pad3;
346         long            st_size;
347         u32             st_blksize;
348         unsigned char   __pad4[4];
349         u32             __pad5;     /* future possible st_blocks high bits */
350         u32             st_blocks;  /* Number 512-byte blocks allocated. */
351         u32             st_atime;
352         u32             __pad6;
353         u32             st_mtime;
354         u32             __pad7;
355         u32             st_ctime;
356         u32             __pad8;     /* will be high 32 bits of ctime someday */
357         unsigned long   st_ino;
358 };      
359 
360 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
361 {
362         struct stat64_emu31 tmp;
363 
364         memset(&tmp, 0, sizeof(tmp));
365 
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;
380 
381         return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 
382 }
383 
384 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
385 {
386         struct kstat stat;
387         int ret = vfs_stat(filename, &stat);
388         if (!ret)
389                 ret = cp_stat64(statbuf, &stat);
390         return ret;
391 }
392 
393 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
394 {
395         struct kstat stat;
396         int ret = vfs_lstat(filename, &stat);
397         if (!ret)
398                 ret = cp_stat64(statbuf, &stat);
399         return ret;
400 }
401 
402 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
403 {
404         struct kstat stat;
405         int ret = vfs_fstat(fd, &stat);
406         if (!ret)
407                 ret = cp_stat64(statbuf, &stat);
408         return ret;
409 }
410 
411 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
412                                 struct stat64_emu31 __user* statbuf, int flag)
413 {
414         struct kstat stat;
415         int error;
416 
417         error = vfs_fstatat(dfd, filename, &stat, flag);
418         if (error)
419                 return error;
420         return cp_stat64(statbuf, &stat);
421 }
422 
423 /*
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..
427  */
428 
429 struct mmap_arg_struct_emu31 {
430         compat_ulong_t addr;
431         compat_ulong_t len;
432         compat_ulong_t prot;
433         compat_ulong_t flags;
434         compat_ulong_t fd;
435         compat_ulong_t offset;
436 };
437 
438 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
439 {
440         struct mmap_arg_struct_emu31 a;
441 
442         if (copy_from_user(&a, arg, sizeof(a)))
443                 return -EFAULT;
444         if (a.offset & ~PAGE_MASK)
445                 return -EINVAL;
446         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
447                               a.offset >> PAGE_SHIFT);
448 }
449 
450 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
451 {
452         struct mmap_arg_struct_emu31 a;
453 
454         if (copy_from_user(&a, arg, sizeof(a)))
455                 return -EFAULT;
456         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
457 }
458 
459 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
460 {
461         if ((compat_ssize_t) count < 0)
462                 return -EINVAL; 
463 
464         return sys_read(fd, buf, count);
465 }
466 
467 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
468 {
469         if ((compat_ssize_t) count < 0)
470                 return -EINVAL; 
471 
472         return sys_write(fd, buf, count);
473 }
474 
475 /*
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.
479  */
480 
481 asmlinkage long
482 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
483 {
484         if (advise == 4)
485                 advise = POSIX_FADV_DONTNEED;
486         else if (advise == 5)
487                 advise = POSIX_FADV_NOREUSE;
488         return sys_fadvise64(fd, offset, len, advise);
489 }
490 
491 struct fadvise64_64_args {
492         int fd;
493         long long offset;
494         long long len;
495         int advice;
496 };
497 
498 asmlinkage long
499 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
500 {
501         struct fadvise64_64_args a;
502 
503         if ( copy_from_user(&a, args, sizeof(a)) )
504                 return -EFAULT;
505         if (a.advice == 4)
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);
510 }
511 

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