~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/arm/kernel/sys_oabi-compat.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.10 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.83 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.153 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.200 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.200 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.76 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  arch/arm/kernel/sys_oabi-compat.c
  3  *
  4  *  Compatibility wrappers for syscalls that are used from
  5  *  old ABI user space binaries with an EABI kernel.
  6  *
  7  *  Author:     Nicolas Pitre
  8  *  Created:    Oct 7, 2005
  9  *  Copyright:  MontaVista Software, Inc.
 10  *
 11  *  This program is free software; you can redistribute it and/or modify
 12  *  it under the terms of the GNU General Public License version 2 as
 13  *  published by the Free Software Foundation.
 14  */
 15 
 16 /*
 17  * The legacy ABI and the new ARM EABI have different rules making some
 18  * syscalls incompatible especially with structure arguments.
 19  * Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
 20  * simply word aligned.  EABI also pads structures to the size of the largest
 21  * member it contains instead of the invariant 32-bit.
 22  *
 23  * The following syscalls are affected:
 24  *
 25  * sys_stat64:
 26  * sys_lstat64:
 27  * sys_fstat64:
 28  * sys_fstatat64:
 29  *
 30  *   struct stat64 has different sizes and some members are shifted
 31  *   Compatibility wrappers are needed for them and provided below.
 32  *
 33  * sys_fcntl64:
 34  *
 35  *   struct flock64 has different sizes and some members are shifted
 36  *   A compatibility wrapper is needed and provided below.
 37  *
 38  * sys_statfs64:
 39  * sys_fstatfs64:
 40  *
 41  *   struct statfs64 has extra padding with EABI growing its size from
 42  *   84 to 88.  This struct is now __attribute__((packed,aligned(4)))
 43  *   with a small assembly wrapper to force the sz argument to 84 if it is 88
 44  *   to avoid copying the extra padding over user space unexpecting it.
 45  *
 46  * sys_newuname:
 47  *
 48  *   struct new_utsname has no padding with EABI.  No problem there.
 49  *
 50  * sys_epoll_ctl:
 51  * sys_epoll_wait:
 52  *
 53  *   struct epoll_event has its second member shifted also affecting the
 54  *   structure size. Compatibility wrappers are needed and provided below.
 55  *
 56  * sys_ipc:
 57  * sys_semop:
 58  * sys_semtimedop:
 59  *
 60  *   struct sembuf loses its padding with EABI.  Since arrays of them are
 61  *   used they have to be copyed to remove the padding. Compatibility wrappers
 62  *   provided below.
 63  *
 64  * sys_bind:
 65  * sys_connect:
 66  * sys_sendmsg:
 67  * sys_sendto:
 68  * sys_socketcall:
 69  *
 70  *   struct sockaddr_un loses its padding with EABI.  Since the size of the
 71  *   structure is used as a validation test in unix_mkname(), we need to
 72  *   change the length argument to 110 whenever it is 112.  Compatibility
 73  *   wrappers provided below.
 74  */
 75 
 76 #include <linux/syscalls.h>
 77 #include <linux/errno.h>
 78 #include <linux/fs.h>
 79 #include <linux/cred.h>
 80 #include <linux/fcntl.h>
 81 #include <linux/eventpoll.h>
 82 #include <linux/sem.h>
 83 #include <linux/socket.h>
 84 #include <linux/net.h>
 85 #include <linux/ipc.h>
 86 #include <linux/uaccess.h>
 87 #include <linux/slab.h>
 88 
 89 struct oldabi_stat64 {
 90         unsigned long long st_dev;
 91         unsigned int    __pad1;
 92         unsigned long   __st_ino;
 93         unsigned int    st_mode;
 94         unsigned int    st_nlink;
 95 
 96         unsigned long   st_uid;
 97         unsigned long   st_gid;
 98 
 99         unsigned long long st_rdev;
100         unsigned int    __pad2;
101 
102         long long       st_size;
103         unsigned long   st_blksize;
104         unsigned long long st_blocks;
105 
106         unsigned long   st_atime;
107         unsigned long   st_atime_nsec;
108 
109         unsigned long   st_mtime;
110         unsigned long   st_mtime_nsec;
111 
112         unsigned long   st_ctime;
113         unsigned long   st_ctime_nsec;
114 
115         unsigned long long st_ino;
116 } __attribute__ ((packed,aligned(4)));
117 
118 static long cp_oldabi_stat64(struct kstat *stat,
119                              struct oldabi_stat64 __user *statbuf)
120 {
121         struct oldabi_stat64 tmp;
122 
123         tmp.st_dev = huge_encode_dev(stat->dev);
124         tmp.__pad1 = 0;
125         tmp.__st_ino = stat->ino;
126         tmp.st_mode = stat->mode;
127         tmp.st_nlink = stat->nlink;
128         tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
129         tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
130         tmp.st_rdev = huge_encode_dev(stat->rdev);
131         tmp.st_size = stat->size;
132         tmp.st_blocks = stat->blocks;
133         tmp.__pad2 = 0;
134         tmp.st_blksize = stat->blksize;
135         tmp.st_atime = stat->atime.tv_sec;
136         tmp.st_atime_nsec = stat->atime.tv_nsec;
137         tmp.st_mtime = stat->mtime.tv_sec;
138         tmp.st_mtime_nsec = stat->mtime.tv_nsec;
139         tmp.st_ctime = stat->ctime.tv_sec;
140         tmp.st_ctime_nsec = stat->ctime.tv_nsec;
141         tmp.st_ino = stat->ino;
142         return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
143 }
144 
145 asmlinkage long sys_oabi_stat64(const char __user * filename,
146                                 struct oldabi_stat64 __user * statbuf)
147 {
148         struct kstat stat;
149         int error = vfs_stat(filename, &stat);
150         if (!error)
151                 error = cp_oldabi_stat64(&stat, statbuf);
152         return error;
153 }
154 
155 asmlinkage long sys_oabi_lstat64(const char __user * filename,
156                                  struct oldabi_stat64 __user * statbuf)
157 {
158         struct kstat stat;
159         int error = vfs_lstat(filename, &stat);
160         if (!error)
161                 error = cp_oldabi_stat64(&stat, statbuf);
162         return error;
163 }
164 
165 asmlinkage long sys_oabi_fstat64(unsigned long fd,
166                                  struct oldabi_stat64 __user * statbuf)
167 {
168         struct kstat stat;
169         int error = vfs_fstat(fd, &stat);
170         if (!error)
171                 error = cp_oldabi_stat64(&stat, statbuf);
172         return error;
173 }
174 
175 asmlinkage long sys_oabi_fstatat64(int dfd,
176                                    const char __user *filename,
177                                    struct oldabi_stat64  __user *statbuf,
178                                    int flag)
179 {
180         struct kstat stat;
181         int error;
182 
183         error = vfs_fstatat(dfd, filename, &stat, flag);
184         if (error)
185                 return error;
186         return cp_oldabi_stat64(&stat, statbuf);
187 }
188 
189 struct oabi_flock64 {
190         short   l_type;
191         short   l_whence;
192         loff_t  l_start;
193         loff_t  l_len;
194         pid_t   l_pid;
195 } __attribute__ ((packed,aligned(4)));
196 
197 static long do_locks(unsigned int fd, unsigned int cmd,
198                                  unsigned long arg)
199 {
200         struct flock64 kernel;
201         struct oabi_flock64 user;
202         mm_segment_t fs;
203         long ret;
204 
205         if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
206                            sizeof(user)))
207                 return -EFAULT;
208         kernel.l_type   = user.l_type;
209         kernel.l_whence = user.l_whence;
210         kernel.l_start  = user.l_start;
211         kernel.l_len    = user.l_len;
212         kernel.l_pid    = user.l_pid;
213 
214         fs = get_fs();
215         set_fs(KERNEL_DS);
216         ret = sys_fcntl64(fd, cmd, (unsigned long)&kernel);
217         set_fs(fs);
218 
219         if (!ret && (cmd == F_GETLK64 || cmd == F_OFD_GETLK)) {
220                 user.l_type     = kernel.l_type;
221                 user.l_whence   = kernel.l_whence;
222                 user.l_start    = kernel.l_start;
223                 user.l_len      = kernel.l_len;
224                 user.l_pid      = kernel.l_pid;
225                 if (copy_to_user((struct oabi_flock64 __user *)arg,
226                                  &user, sizeof(user)))
227                         ret = -EFAULT;
228         }
229         return ret;
230 }
231 
232 asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
233                                  unsigned long arg)
234 {
235         switch (cmd) {
236         case F_OFD_GETLK:
237         case F_OFD_SETLK:
238         case F_OFD_SETLKW:
239         case F_GETLK64:
240         case F_SETLK64:
241         case F_SETLKW64:
242                 return do_locks(fd, cmd, arg);
243 
244         default:
245                 return sys_fcntl64(fd, cmd, arg);
246         }
247 }
248 
249 struct oabi_epoll_event {
250         __u32 events;
251         __u64 data;
252 } __attribute__ ((packed,aligned(4)));
253 
254 asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
255                                    struct oabi_epoll_event __user *event)
256 {
257         struct oabi_epoll_event user;
258         struct epoll_event kernel;
259         mm_segment_t fs;
260         long ret;
261 
262         if (op == EPOLL_CTL_DEL)
263                 return sys_epoll_ctl(epfd, op, fd, NULL);
264         if (copy_from_user(&user, event, sizeof(user)))
265                 return -EFAULT;
266         kernel.events = user.events;
267         kernel.data   = user.data;
268         fs = get_fs();
269         set_fs(KERNEL_DS);
270         ret = sys_epoll_ctl(epfd, op, fd, &kernel);
271         set_fs(fs);
272         return ret;
273 }
274 
275 asmlinkage long sys_oabi_epoll_wait(int epfd,
276                                     struct oabi_epoll_event __user *events,
277                                     int maxevents, int timeout)
278 {
279         struct epoll_event *kbuf;
280         mm_segment_t fs;
281         long ret, err, i;
282 
283         if (maxevents <= 0 ||
284                         maxevents > (INT_MAX/sizeof(*kbuf)) ||
285                         maxevents > (INT_MAX/sizeof(*events)))
286                 return -EINVAL;
287         if (!access_ok(VERIFY_WRITE, events, sizeof(*events) * maxevents))
288                 return -EFAULT;
289         kbuf = kmalloc(sizeof(*kbuf) * maxevents, GFP_KERNEL);
290         if (!kbuf)
291                 return -ENOMEM;
292         fs = get_fs();
293         set_fs(KERNEL_DS);
294         ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
295         set_fs(fs);
296         err = 0;
297         for (i = 0; i < ret; i++) {
298                 __put_user_error(kbuf[i].events, &events->events, err);
299                 __put_user_error(kbuf[i].data,   &events->data,   err);
300                 events++;
301         }
302         kfree(kbuf);
303         return err ? -EFAULT : ret;
304 }
305 
306 struct oabi_sembuf {
307         unsigned short  sem_num;
308         short           sem_op;
309         short           sem_flg;
310         unsigned short  __pad;
311 };
312 
313 asmlinkage long sys_oabi_semtimedop(int semid,
314                                     struct oabi_sembuf __user *tsops,
315                                     unsigned nsops,
316                                     const struct timespec __user *timeout)
317 {
318         struct sembuf *sops;
319         struct timespec local_timeout;
320         long err;
321         int i;
322 
323         if (nsops < 1 || nsops > SEMOPM)
324                 return -EINVAL;
325         if (!access_ok(VERIFY_READ, tsops, sizeof(*tsops) * nsops))
326                 return -EFAULT;
327         sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL);
328         if (!sops)
329                 return -ENOMEM;
330         err = 0;
331         for (i = 0; i < nsops; i++) {
332                 __get_user_error(sops[i].sem_num, &tsops->sem_num, err);
333                 __get_user_error(sops[i].sem_op,  &tsops->sem_op,  err);
334                 __get_user_error(sops[i].sem_flg, &tsops->sem_flg, err);
335                 tsops++;
336         }
337         if (timeout) {
338                 /* copy this as well before changing domain protection */
339                 err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout));
340                 timeout = &local_timeout;
341         }
342         if (err) {
343                 err = -EFAULT;
344         } else {
345                 mm_segment_t fs = get_fs();
346                 set_fs(KERNEL_DS);
347                 err = sys_semtimedop(semid, sops, nsops, timeout);
348                 set_fs(fs);
349         }
350         kfree(sops);
351         return err;
352 }
353 
354 asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
355                                unsigned nsops)
356 {
357         return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
358 }
359 
360 asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
361                             void __user *ptr, long fifth)
362 {
363         switch (call & 0xffff) {
364         case SEMOP:
365                 return  sys_oabi_semtimedop(first,
366                                             (struct oabi_sembuf __user *)ptr,
367                                             second, NULL);
368         case SEMTIMEDOP:
369                 return  sys_oabi_semtimedop(first,
370                                             (struct oabi_sembuf __user *)ptr,
371                                             second,
372                                             (const struct timespec __user *)fifth);
373         default:
374                 return sys_ipc(call, first, second, third, ptr, fifth);
375         }
376 }
377 
378 asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
379 {
380         sa_family_t sa_family;
381         if (addrlen == 112 &&
382             get_user(sa_family, &addr->sa_family) == 0 &&
383             sa_family == AF_UNIX)
384                         addrlen = 110;
385         return sys_bind(fd, addr, addrlen);
386 }
387 
388 asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
389 {
390         sa_family_t sa_family;
391         if (addrlen == 112 &&
392             get_user(sa_family, &addr->sa_family) == 0 &&
393             sa_family == AF_UNIX)
394                         addrlen = 110;
395         return sys_connect(fd, addr, addrlen);
396 }
397 
398 asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
399                                 size_t len, unsigned flags,
400                                 struct sockaddr __user *addr,
401                                 int addrlen)
402 {
403         sa_family_t sa_family;
404         if (addrlen == 112 &&
405             get_user(sa_family, &addr->sa_family) == 0 &&
406             sa_family == AF_UNIX)
407                         addrlen = 110;
408         return sys_sendto(fd, buff, len, flags, addr, addrlen);
409 }
410 
411 asmlinkage long sys_oabi_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
412 {
413         struct sockaddr __user *addr;
414         int msg_namelen;
415         sa_family_t sa_family;
416         if (msg &&
417             get_user(msg_namelen, &msg->msg_namelen) == 0 &&
418             msg_namelen == 112 &&
419             get_user(addr, &msg->msg_name) == 0 &&
420             get_user(sa_family, &addr->sa_family) == 0 &&
421             sa_family == AF_UNIX)
422         {
423                 /*
424                  * HACK ALERT: there is a limit to how much backward bending
425                  * we should do for what is actually a transitional
426                  * compatibility layer.  This already has known flaws with
427                  * a few ioctls that we don't intend to fix.  Therefore
428                  * consider this blatent hack as another one... and take care
429                  * to run for cover.  In most cases it will "just work fine".
430                  * If it doesn't, well, tough.
431                  */
432                 put_user(110, &msg->msg_namelen);
433         }
434         return sys_sendmsg(fd, msg, flags);
435 }
436 
437 asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
438 {
439         unsigned long r = -EFAULT, a[6];
440 
441         switch (call) {
442         case SYS_BIND:
443                 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
444                         r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
445                 break;
446         case SYS_CONNECT:
447                 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
448                         r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
449                 break;
450         case SYS_SENDTO:
451                 if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
452                         r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
453                                             (struct sockaddr __user *)a[4], a[5]);
454                 break;
455         case SYS_SENDMSG:
456                 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
457                         r = sys_oabi_sendmsg(a[0], (struct user_msghdr __user *)a[1], a[2]);
458                 break;
459         default:
460                 r = sys_socketcall(call, args);
461         }
462 
463         return r;
464 }
465 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp