4 * Kernel compatibililty routines for e.g. 32 bit syscall support
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
18 #include <linux/stddef.h>
19 #include <linux/kernel.h>
20 #include <linux/linkage.h>
21 #include <linux/compat.h>
22 #include <linux/errno.h>
23 #include <linux/time.h>
25 #include <linux/fcntl.h>
26 #include <linux/namei.h>
27 #include <linux/file.h>
28 #include <linux/fdtable.h>
29 #include <linux/vfs.h>
30 #include <linux/ioctl.h>
31 #include <linux/init.h>
32 #include <linux/ncp_mount.h>
33 #include <linux/nfs4_mount.h>
34 #include <linux/syscalls.h>
35 #include <linux/ctype.h>
36 #include <linux/dirent.h>
37 #include <linux/fsnotify.h>
38 #include <linux/highuid.h>
39 #include <linux/personality.h>
40 #include <linux/rwsem.h>
41 #include <linux/tsacct_kern.h>
42 #include <linux/security.h>
43 #include <linux/highmem.h>
44 #include <linux/signal.h>
45 #include <linux/poll.h>
47 #include <linux/fs_struct.h>
48 #include <linux/slab.h>
49 #include <linux/pagemap.h>
50 #include <linux/aio.h>
52 #include <asm/uaccess.h>
53 #include <asm/mmu_context.h>
54 #include <asm/ioctls.h>
59 int compat_printk(const char *fmt, ...)
66 ret = vprintk(fmt, ap);
72 * Not all architectures have sys_utime, so implement this in terms
75 asmlinkage long compat_sys_utime(const char __user *filename,
76 struct compat_utimbuf __user *t)
78 struct timespec tv[2];
81 if (get_user(tv[0].tv_sec, &t->actime) ||
82 get_user(tv[1].tv_sec, &t->modtime))
87 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
90 asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
92 struct timespec tv[2];
95 if (get_compat_timespec(&tv[0], &t[0]) ||
96 get_compat_timespec(&tv[1], &t[1]))
99 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
102 return do_utimes(dfd, filename, t ? tv : NULL, flags);
105 asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
107 struct timespec tv[2];
110 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
111 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
112 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
113 get_user(tv[1].tv_nsec, &t[1].tv_usec))
115 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
116 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
118 tv[0].tv_nsec *= 1000;
119 tv[1].tv_nsec *= 1000;
121 return do_utimes(dfd, filename, t ? tv : NULL, 0);
124 asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
126 return compat_sys_futimesat(AT_FDCWD, filename, t);
129 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
131 struct compat_stat tmp;
133 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
136 memset(&tmp, 0, sizeof(tmp));
137 tmp.st_dev = old_encode_dev(stat->dev);
138 tmp.st_ino = stat->ino;
139 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
141 tmp.st_mode = stat->mode;
142 tmp.st_nlink = stat->nlink;
143 if (tmp.st_nlink != stat->nlink)
145 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
146 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
147 tmp.st_rdev = old_encode_dev(stat->rdev);
148 if ((u64) stat->size > MAX_NON_LFS)
150 tmp.st_size = stat->size;
151 tmp.st_atime = stat->atime.tv_sec;
152 tmp.st_atime_nsec = stat->atime.tv_nsec;
153 tmp.st_mtime = stat->mtime.tv_sec;
154 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
155 tmp.st_ctime = stat->ctime.tv_sec;
156 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
157 tmp.st_blocks = stat->blocks;
158 tmp.st_blksize = stat->blksize;
159 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
162 asmlinkage long compat_sys_newstat(const char __user * filename,
163 struct compat_stat __user *statbuf)
168 error = vfs_stat(filename, &stat);
171 return cp_compat_stat(&stat, statbuf);
174 asmlinkage long compat_sys_newlstat(const char __user * filename,
175 struct compat_stat __user *statbuf)
180 error = vfs_lstat(filename, &stat);
183 return cp_compat_stat(&stat, statbuf);
186 #ifndef __ARCH_WANT_STAT64
187 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
188 const char __user *filename,
189 struct compat_stat __user *statbuf, int flag)
194 error = vfs_fstatat(dfd, filename, &stat, flag);
197 return cp_compat_stat(&stat, statbuf);
201 asmlinkage long compat_sys_newfstat(unsigned int fd,
202 struct compat_stat __user * statbuf)
205 int error = vfs_fstat(fd, &stat);
208 error = cp_compat_stat(&stat, statbuf);
212 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
215 if (sizeof ubuf->f_blocks == 4) {
216 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
217 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
219 /* f_files and f_ffree may be -1; it's okay
220 * to stuff that into 32 bits */
221 if (kbuf->f_files != 0xffffffffffffffffULL
222 && (kbuf->f_files & 0xffffffff00000000ULL))
224 if (kbuf->f_ffree != 0xffffffffffffffffULL
225 && (kbuf->f_ffree & 0xffffffff00000000ULL))
228 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
229 __put_user(kbuf->f_type, &ubuf->f_type) ||
230 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
231 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
232 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
233 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
234 __put_user(kbuf->f_files, &ubuf->f_files) ||
235 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
236 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
237 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
238 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
239 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
240 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
241 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
247 * The following statfs calls are copies of code from fs/statfs.c and
248 * should be checked against those from time to time
250 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
253 int error = user_statfs(pathname, &tmp);
255 error = put_compat_statfs(buf, &tmp);
259 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
262 int error = fd_statfs(fd, &tmp);
264 error = put_compat_statfs(buf, &tmp);
268 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
270 if (sizeof ubuf->f_blocks == 4) {
271 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
272 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
274 /* f_files and f_ffree may be -1; it's okay
275 * to stuff that into 32 bits */
276 if (kbuf->f_files != 0xffffffffffffffffULL
277 && (kbuf->f_files & 0xffffffff00000000ULL))
279 if (kbuf->f_ffree != 0xffffffffffffffffULL
280 && (kbuf->f_ffree & 0xffffffff00000000ULL))
283 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
284 __put_user(kbuf->f_type, &ubuf->f_type) ||
285 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
286 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
287 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
288 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
289 __put_user(kbuf->f_files, &ubuf->f_files) ||
290 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
291 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
292 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
293 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
294 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
295 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
296 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
301 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
306 if (sz != sizeof(*buf))
309 error = user_statfs(pathname, &tmp);
311 error = put_compat_statfs64(buf, &tmp);
315 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
320 if (sz != sizeof(*buf))
323 error = fd_statfs(fd, &tmp);
325 error = put_compat_statfs64(buf, &tmp);
330 * This is a copy of sys_ustat, just dealing with a structure layout.
331 * Given how simple this syscall is that apporach is more maintainable
332 * than the various conversion hacks.
334 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
336 struct compat_ustat tmp;
338 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
342 memset(&tmp, 0, sizeof(struct compat_ustat));
343 tmp.f_tfree = sbuf.f_bfree;
344 tmp.f_tinode = sbuf.f_ffree;
345 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
350 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
352 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
353 __get_user(kfl->l_type, &ufl->l_type) ||
354 __get_user(kfl->l_whence, &ufl->l_whence) ||
355 __get_user(kfl->l_start, &ufl->l_start) ||
356 __get_user(kfl->l_len, &ufl->l_len) ||
357 __get_user(kfl->l_pid, &ufl->l_pid))
362 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
364 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
365 __put_user(kfl->l_type, &ufl->l_type) ||
366 __put_user(kfl->l_whence, &ufl->l_whence) ||
367 __put_user(kfl->l_start, &ufl->l_start) ||
368 __put_user(kfl->l_len, &ufl->l_len) ||
369 __put_user(kfl->l_pid, &ufl->l_pid))
374 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
375 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
377 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
378 __get_user(kfl->l_type, &ufl->l_type) ||
379 __get_user(kfl->l_whence, &ufl->l_whence) ||
380 __get_user(kfl->l_start, &ufl->l_start) ||
381 __get_user(kfl->l_len, &ufl->l_len) ||
382 __get_user(kfl->l_pid, &ufl->l_pid))
388 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
389 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
391 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
392 __put_user(kfl->l_type, &ufl->l_type) ||
393 __put_user(kfl->l_whence, &ufl->l_whence) ||
394 __put_user(kfl->l_start, &ufl->l_start) ||
395 __put_user(kfl->l_len, &ufl->l_len) ||
396 __put_user(kfl->l_pid, &ufl->l_pid))
403 convert_fcntl_cmd(unsigned int cmd)
417 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
423 unsigned int conv_cmd;
429 ret = get_compat_flock(&f, compat_ptr(arg));
434 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
436 if (cmd == F_GETLK && ret == 0) {
437 /* GETLK was successful and we need to return the data...
438 * but it needs to fit in the compat structure.
439 * l_start shouldn't be too big, unless the original
440 * start + end is greater than COMPAT_OFF_T_MAX, in which
441 * case the app was asking for trouble, so we return
442 * -EOVERFLOW in that case.
443 * l_len could be too big, in which case we just truncate it,
444 * and only allow the app to see that part of the conflicting
445 * lock that might make sense to it anyway
448 if (f.l_start > COMPAT_OFF_T_MAX)
450 if (f.l_len > COMPAT_OFF_T_MAX)
451 f.l_len = COMPAT_OFF_T_MAX;
453 ret = put_compat_flock(&f, compat_ptr(arg));
463 ret = get_compat_flock64(&f, compat_ptr(arg));
468 conv_cmd = convert_fcntl_cmd(cmd);
469 ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f);
471 if ((conv_cmd == F_GETLK || conv_cmd == F_GETLKP) && ret == 0) {
472 /* need to return lock information - see above for commentary */
473 if (f.l_start > COMPAT_LOFF_T_MAX)
475 if (f.l_len > COMPAT_LOFF_T_MAX)
476 f.l_len = COMPAT_LOFF_T_MAX;
478 ret = put_compat_flock64(&f, compat_ptr(arg));
483 ret = sys_fcntl(fd, cmd, arg);
489 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
501 return compat_sys_fcntl64(fd, cmd, arg);
505 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
510 mm_segment_t oldfs = get_fs();
511 if (unlikely(get_user(ctx64, ctx32p)))
515 /* The __user pointer cast is valid because of the set_fs() */
516 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
518 /* truncating is ok because it's a user address */
520 ret = put_user((u32) ctx64, ctx32p);
525 compat_sys_io_getevents(aio_context_t ctx_id,
526 unsigned long min_nr,
528 struct io_event __user *events,
529 struct compat_timespec __user *timeout)
533 struct timespec __user *ut = NULL;
536 if (unlikely(!access_ok(VERIFY_WRITE, events,
537 nr * sizeof(struct io_event))))
540 if (get_compat_timespec(&t, timeout))
543 ut = compat_alloc_user_space(sizeof(*ut));
544 if (copy_to_user(ut, &t, sizeof(t)) )
547 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
552 /* A write operation does a read from user space and vice versa */
553 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
555 ssize_t compat_rw_copy_check_uvector(int type,
556 const struct compat_iovec __user *uvector, unsigned long nr_segs,
557 unsigned long fast_segs, struct iovec *fast_pointer,
558 struct iovec **ret_pointer)
560 compat_ssize_t tot_len;
561 struct iovec *iov = *ret_pointer = fast_pointer;
566 * SuS says "The readv() function *may* fail if the iovcnt argument
567 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
568 * traditionally returned zero for zero segments, so...
574 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
576 if (nr_segs > fast_segs) {
578 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
585 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
589 * Single unix specification:
590 * We should -EINVAL if an element length is not >= 0 and fitting an
593 * In Linux, the total length is limited to MAX_RW_COUNT, there is
594 * no overflow possibility.
598 for (seg = 0; seg < nr_segs; seg++) {
602 if (__get_user(len, &uvector->iov_len) ||
603 __get_user(buf, &uvector->iov_base)) {
607 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
610 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
614 if (len > MAX_RW_COUNT - tot_len)
615 len = MAX_RW_COUNT - tot_len;
617 iov->iov_base = compat_ptr(buf);
618 iov->iov_len = (compat_size_t) len;
629 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
634 for (i = 0; i < nr; ++i) {
635 if (get_user(uptr, ptr32 + i))
637 if (put_user(compat_ptr(uptr), ptr64 + i))
643 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
646 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
648 struct iocb __user * __user *iocb64;
651 if (unlikely(nr < 0))
654 if (nr > MAX_AIO_SUBMITS)
655 nr = MAX_AIO_SUBMITS;
657 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
658 ret = copy_iocb(nr, iocb, iocb64);
660 ret = do_io_submit(ctx_id, nr, iocb64, 1);
664 struct compat_ncp_mount_data {
665 compat_int_t version;
666 compat_uint_t ncp_fd;
667 __compat_uid_t mounted_uid;
668 compat_pid_t wdog_pid;
669 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
670 compat_uint_t time_out;
671 compat_uint_t retry_count;
675 compat_mode_t file_mode;
676 compat_mode_t dir_mode;
679 struct compat_ncp_mount_data_v4 {
680 compat_int_t version;
681 compat_ulong_t flags;
682 compat_ulong_t mounted_uid;
683 compat_long_t wdog_pid;
684 compat_uint_t ncp_fd;
685 compat_uint_t time_out;
686 compat_uint_t retry_count;
689 compat_ulong_t file_mode;
690 compat_ulong_t dir_mode;
693 static void *do_ncp_super_data_conv(void *raw_data)
695 int version = *(unsigned int *)raw_data;
698 struct compat_ncp_mount_data *c_n = raw_data;
699 struct ncp_mount_data *n = raw_data;
701 n->dir_mode = c_n->dir_mode;
702 n->file_mode = c_n->file_mode;
705 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
706 n->wdog_pid = c_n->wdog_pid;
707 n->mounted_uid = c_n->mounted_uid;
708 } else if (version == 4) {
709 struct compat_ncp_mount_data_v4 *c_n = raw_data;
710 struct ncp_mount_data_v4 *n = raw_data;
712 n->dir_mode = c_n->dir_mode;
713 n->file_mode = c_n->file_mode;
716 n->retry_count = c_n->retry_count;
717 n->time_out = c_n->time_out;
718 n->ncp_fd = c_n->ncp_fd;
719 n->wdog_pid = c_n->wdog_pid;
720 n->mounted_uid = c_n->mounted_uid;
721 n->flags = c_n->flags;
722 } else if (version != 5) {
730 struct compat_nfs_string {
735 static inline void compat_nfs_string(struct nfs_string *dst,
736 struct compat_nfs_string *src)
738 dst->data = compat_ptr(src->data);
742 struct compat_nfs4_mount_data_v1 {
743 compat_int_t version;
748 compat_int_t retrans;
749 compat_int_t acregmin;
750 compat_int_t acregmax;
751 compat_int_t acdirmin;
752 compat_int_t acdirmax;
753 struct compat_nfs_string client_addr;
754 struct compat_nfs_string mnt_path;
755 struct compat_nfs_string hostname;
756 compat_uint_t host_addrlen;
757 compat_uptr_t host_addr;
759 compat_int_t auth_flavourlen;
760 compat_uptr_t auth_flavours;
763 static int do_nfs4_super_data_conv(void *raw_data)
765 int version = *(compat_uint_t *) raw_data;
768 struct compat_nfs4_mount_data_v1 *raw = raw_data;
769 struct nfs4_mount_data *real = raw_data;
771 /* copy the fields backwards */
772 real->auth_flavours = compat_ptr(raw->auth_flavours);
773 real->auth_flavourlen = raw->auth_flavourlen;
774 real->proto = raw->proto;
775 real->host_addr = compat_ptr(raw->host_addr);
776 real->host_addrlen = raw->host_addrlen;
777 compat_nfs_string(&real->hostname, &raw->hostname);
778 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
779 compat_nfs_string(&real->client_addr, &raw->client_addr);
780 real->acdirmax = raw->acdirmax;
781 real->acdirmin = raw->acdirmin;
782 real->acregmax = raw->acregmax;
783 real->acregmin = raw->acregmin;
784 real->retrans = raw->retrans;
785 real->timeo = raw->timeo;
786 real->wsize = raw->wsize;
787 real->rsize = raw->rsize;
788 real->flags = raw->flags;
789 real->version = raw->version;
795 #define NCPFS_NAME "ncpfs"
796 #define NFS4_NAME "nfs4"
798 asmlinkage long compat_sys_mount(const char __user * dev_name,
799 const char __user * dir_name,
800 const char __user * type, unsigned long flags,
801 const void __user * data)
804 unsigned long data_page;
806 struct filename *dir;
809 retval = copy_mount_string(type, &kernel_type);
813 dir = getname(dir_name);
814 retval = PTR_ERR(dir);
818 retval = copy_mount_string(dev_name, &kernel_dev);
822 retval = copy_mount_options(data, &data_page);
828 if (kernel_type && data_page) {
829 if (!strcmp(kernel_type, NCPFS_NAME)) {
830 do_ncp_super_data_conv((void *)data_page);
831 } else if (!strcmp(kernel_type, NFS4_NAME)) {
832 if (do_nfs4_super_data_conv((void *) data_page))
837 retval = do_mount(kernel_dev, dir->name, kernel_type,
838 flags, (void*)data_page);
841 free_page(data_page);
852 struct compat_old_linux_dirent {
853 compat_ulong_t d_ino;
854 compat_ulong_t d_offset;
855 unsigned short d_namlen;
859 struct compat_readdir_callback {
860 struct dir_context ctx;
861 struct compat_old_linux_dirent __user *dirent;
865 static int compat_fillonedir(void *__buf, const char *name, int namlen,
866 loff_t offset, u64 ino, unsigned int d_type)
868 struct compat_readdir_callback *buf = __buf;
869 struct compat_old_linux_dirent __user *dirent;
870 compat_ulong_t d_ino;
875 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
876 buf->result = -EOVERFLOW;
880 dirent = buf->dirent;
881 if (!access_ok(VERIFY_WRITE, dirent,
882 (unsigned long)(dirent->d_name + namlen + 1) -
883 (unsigned long)dirent))
885 if ( __put_user(d_ino, &dirent->d_ino) ||
886 __put_user(offset, &dirent->d_offset) ||
887 __put_user(namlen, &dirent->d_namlen) ||
888 __copy_to_user(dirent->d_name, name, namlen) ||
889 __put_user(0, dirent->d_name + namlen))
893 buf->result = -EFAULT;
897 asmlinkage long compat_sys_old_readdir(unsigned int fd,
898 struct compat_old_linux_dirent __user *dirent, unsigned int count)
901 struct fd f = fdget(fd);
902 struct compat_readdir_callback buf = {
903 .ctx.actor = compat_fillonedir,
910 error = iterate_dir(f.file, &buf.ctx);
918 struct compat_linux_dirent {
919 compat_ulong_t d_ino;
920 compat_ulong_t d_off;
921 unsigned short d_reclen;
925 struct compat_getdents_callback {
926 struct dir_context ctx;
927 struct compat_linux_dirent __user *current_dir;
928 struct compat_linux_dirent __user *previous;
933 static int compat_filldir(void *__buf, const char *name, int namlen,
934 loff_t offset, u64 ino, unsigned int d_type)
936 struct compat_linux_dirent __user * dirent;
937 struct compat_getdents_callback *buf = __buf;
938 compat_ulong_t d_ino;
939 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
940 namlen + 2, sizeof(compat_long_t));
942 buf->error = -EINVAL; /* only used if we fail.. */
943 if (reclen > buf->count)
946 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
947 buf->error = -EOVERFLOW;
950 dirent = buf->previous;
952 if (__put_user(offset, &dirent->d_off))
955 dirent = buf->current_dir;
956 if (__put_user(d_ino, &dirent->d_ino))
958 if (__put_user(reclen, &dirent->d_reclen))
960 if (copy_to_user(dirent->d_name, name, namlen))
962 if (__put_user(0, dirent->d_name + namlen))
964 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
966 buf->previous = dirent;
967 dirent = (void __user *)dirent + reclen;
968 buf->current_dir = dirent;
969 buf->count -= reclen;
972 buf->error = -EFAULT;
976 asmlinkage long compat_sys_getdents(unsigned int fd,
977 struct compat_linux_dirent __user *dirent, unsigned int count)
980 struct compat_linux_dirent __user * lastdirent;
981 struct compat_getdents_callback buf = {
982 .ctx.actor = compat_filldir,
983 .current_dir = dirent,
988 if (!access_ok(VERIFY_WRITE, dirent, count))
995 error = iterate_dir(f.file, &buf.ctx);
998 lastdirent = buf.previous;
1000 if (put_user(buf.ctx.pos, &lastdirent->d_off))
1003 error = count - buf.count;
1009 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1011 struct compat_getdents_callback64 {
1012 struct dir_context ctx;
1013 struct linux_dirent64 __user *current_dir;
1014 struct linux_dirent64 __user *previous;
1019 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1020 u64 ino, unsigned int d_type)
1022 struct linux_dirent64 __user *dirent;
1023 struct compat_getdents_callback64 *buf = __buf;
1024 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1028 buf->error = -EINVAL; /* only used if we fail.. */
1029 if (reclen > buf->count)
1031 dirent = buf->previous;
1034 if (__put_user_unaligned(offset, &dirent->d_off))
1037 dirent = buf->current_dir;
1038 if (__put_user_unaligned(ino, &dirent->d_ino))
1041 if (__put_user_unaligned(off, &dirent->d_off))
1043 if (__put_user(reclen, &dirent->d_reclen))
1045 if (__put_user(d_type, &dirent->d_type))
1047 if (copy_to_user(dirent->d_name, name, namlen))
1049 if (__put_user(0, dirent->d_name + namlen))
1051 buf->previous = dirent;
1052 dirent = (void __user *)dirent + reclen;
1053 buf->current_dir = dirent;
1054 buf->count -= reclen;
1057 buf->error = -EFAULT;
1061 asmlinkage long compat_sys_getdents64(unsigned int fd,
1062 struct linux_dirent64 __user * dirent, unsigned int count)
1065 struct linux_dirent64 __user * lastdirent;
1066 struct compat_getdents_callback64 buf = {
1067 .ctx.actor = compat_filldir64,
1068 .current_dir = dirent,
1073 if (!access_ok(VERIFY_WRITE, dirent, count))
1080 error = iterate_dir(f.file, &buf.ctx);
1083 lastdirent = buf.previous;
1085 typeof(lastdirent->d_off) d_off = buf.ctx.pos;
1086 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1089 error = count - buf.count;
1094 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1097 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1100 COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
1102 return do_sys_open(AT_FDCWD, filename, flags, mode);
1106 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1109 COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
1111 return do_sys_open(dfd, filename, flags, mode);
1114 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1116 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1117 int timeval, int ret)
1124 if (current->personality & STICKY_TIMEOUTS)
1127 /* No update for zero timeout */
1128 if (!end_time->tv_sec && !end_time->tv_nsec)
1132 ts = timespec_sub(*end_time, ts);
1134 ts.tv_sec = ts.tv_nsec = 0;
1137 struct compat_timeval rtv;
1139 rtv.tv_sec = ts.tv_sec;
1140 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1142 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1145 struct compat_timespec rts;
1147 rts.tv_sec = ts.tv_sec;
1148 rts.tv_nsec = ts.tv_nsec;
1150 if (!copy_to_user(p, &rts, sizeof(rts)))
1154 * If an application puts its timeval in read-only memory, we
1155 * don't want the Linux-specific update to the timeval to
1156 * cause a fault after the select has completed
1157 * successfully. However, because we're not updating the
1158 * timeval, we can't restart the system call.
1162 if (ret == -ERESTARTNOHAND)
1168 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1169 * 64-bit unsigned longs.
1172 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1173 unsigned long *fdset)
1175 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1179 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1186 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1189 *fdset++ = h << 32 | l;
1192 if (odd && __get_user(*fdset, ufdset))
1195 /* Tricky, must clear full unsigned long in the
1196 * kernel fdset at the end, this makes sure that
1199 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1205 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1206 unsigned long *fdset)
1209 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1220 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1225 if (odd && __put_user(*fdset, ufdset))
1232 * This is a virtual copy of sys_select from fs/select.c and probably
1233 * should be compared to it from time to time
1237 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1238 * like to be certain this leads to no problems. So I return
1239 * EINTR just for safety.
1241 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1242 * I'm trying ERESTARTNOHAND which restart only when you want to.
1244 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1245 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1246 struct timespec *end_time)
1250 int size, max_fds, ret = -EINVAL;
1251 struct fdtable *fdt;
1252 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1257 /* max_fds can increase, so grab it once to avoid race */
1259 fdt = files_fdtable(current->files);
1260 max_fds = fdt->max_fds;
1266 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1267 * since we used fdset we need to allocate memory in units of
1270 size = FDS_BYTES(n);
1272 if (size > sizeof(stack_fds) / 6) {
1273 bits = kmalloc(6 * size, GFP_KERNEL);
1278 fds.in = (unsigned long *) bits;
1279 fds.out = (unsigned long *) (bits + size);
1280 fds.ex = (unsigned long *) (bits + 2*size);
1281 fds.res_in = (unsigned long *) (bits + 3*size);
1282 fds.res_out = (unsigned long *) (bits + 4*size);
1283 fds.res_ex = (unsigned long *) (bits + 5*size);
1285 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1286 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1287 (ret = compat_get_fd_set(n, exp, fds.ex)))
1289 zero_fd_set(n, fds.res_in);
1290 zero_fd_set(n, fds.res_out);
1291 zero_fd_set(n, fds.res_ex);
1293 ret = do_select(n, &fds, end_time);
1298 ret = -ERESTARTNOHAND;
1299 if (signal_pending(current))
1304 if (compat_set_fd_set(n, inp, fds.res_in) ||
1305 compat_set_fd_set(n, outp, fds.res_out) ||
1306 compat_set_fd_set(n, exp, fds.res_ex))
1309 if (bits != stack_fds)
1315 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1316 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1317 struct compat_timeval __user *tvp)
1319 struct timespec end_time, *to = NULL;
1320 struct compat_timeval tv;
1324 if (copy_from_user(&tv, tvp, sizeof(tv)))
1328 if (poll_select_set_timeout(to,
1329 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1330 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1334 ret = compat_core_sys_select(n, inp, outp, exp, to);
1335 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1340 struct compat_sel_arg_struct {
1348 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1350 struct compat_sel_arg_struct a;
1352 if (copy_from_user(&a, arg, sizeof(a)))
1354 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1355 compat_ptr(a.exp), compat_ptr(a.tvp));
1358 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1359 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1360 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1361 compat_size_t sigsetsize)
1363 compat_sigset_t ss32;
1364 sigset_t ksigmask, sigsaved;
1365 struct compat_timespec ts;
1366 struct timespec end_time, *to = NULL;
1370 if (copy_from_user(&ts, tsp, sizeof(ts)))
1374 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1379 if (sigsetsize != sizeof(compat_sigset_t))
1381 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1383 sigset_from_compat(&ksigmask, &ss32);
1385 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1386 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1389 ret = compat_core_sys_select(n, inp, outp, exp, to);
1390 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1392 if (ret == -ERESTARTNOHAND) {
1394 * Don't restore the signal mask yet. Let do_signal() deliver
1395 * the signal on the way back to userspace, before the signal
1399 memcpy(¤t->saved_sigmask, &sigsaved,
1401 set_restore_sigmask();
1404 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1409 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1410 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1411 struct compat_timespec __user *tsp, void __user *sig)
1413 compat_size_t sigsetsize = 0;
1414 compat_uptr_t up = 0;
1417 if (!access_ok(VERIFY_READ, sig,
1418 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1419 __get_user(up, (compat_uptr_t __user *)sig) ||
1420 __get_user(sigsetsize,
1421 (compat_size_t __user *)(sig+sizeof(up))))
1424 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1428 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1429 unsigned int nfds, struct compat_timespec __user *tsp,
1430 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1432 compat_sigset_t ss32;
1433 sigset_t ksigmask, sigsaved;
1434 struct compat_timespec ts;
1435 struct timespec end_time, *to = NULL;
1439 if (copy_from_user(&ts, tsp, sizeof(ts)))
1443 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1448 if (sigsetsize != sizeof(compat_sigset_t))
1450 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1452 sigset_from_compat(&ksigmask, &ss32);
1454 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1455 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1458 ret = do_sys_poll(ufds, nfds, to);
1460 /* We can restart this syscall, usually */
1461 if (ret == -EINTR) {
1463 * Don't restore the signal mask yet. Let do_signal() deliver
1464 * the signal on the way back to userspace, before the signal
1468 memcpy(¤t->saved_sigmask, &sigsaved,
1470 set_restore_sigmask();
1472 ret = -ERESTARTNOHAND;
1474 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1476 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1481 #ifdef CONFIG_FHANDLE
1483 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1484 * doesn't set the O_LARGEFILE flag.
1486 COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1487 struct file_handle __user *, handle, int, flags)
1489 return do_handle_open(mountdirfd, handle, flags);