| /* |
| * linux/fs/compat.c |
| * |
| * Kernel compatibililty routines for e.g. 32 bit syscall support |
| * on 64 bit kernels. |
| * |
| * Copyright (C) 2002 Stephen Rothwell, IBM Corporation |
| * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com) |
| * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) |
| * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs |
| * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/stddef.h> |
| #include <linux/kernel.h> |
| #include <linux/linkage.h> |
| #include <linux/compat.h> |
| #include <linux/errno.h> |
| #include <linux/time.h> |
| #include <linux/fs.h> |
| #include <linux/fcntl.h> |
| #include <linux/namei.h> |
| #include <linux/file.h> |
| #include <linux/fdtable.h> |
| #include <linux/vfs.h> |
| #include <linux/ioctl.h> |
| #include <linux/init.h> |
| #include <linux/ncp_mount.h> |
| #include <linux/nfs4_mount.h> |
| #include <linux/syscalls.h> |
| #include <linux/ctype.h> |
| #include <linux/dirent.h> |
| #include <linux/fsnotify.h> |
| #include <linux/highuid.h> |
| #include <linux/personality.h> |
| #include <linux/rwsem.h> |
| #include <linux/tsacct_kern.h> |
| #include <linux/security.h> |
| #include <linux/highmem.h> |
| #include <linux/signal.h> |
| #include <linux/poll.h> |
| #include <linux/mm.h> |
| #include <linux/eventpoll.h> |
| #include <linux/fs_struct.h> |
| #include <linux/slab.h> |
| #include <linux/pagemap.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/mmu_context.h> |
| #include <asm/ioctls.h> |
| #include "internal.h" |
| |
| int compat_log = 1; |
| |
| int compat_printk(const char *fmt, ...) |
| { |
| va_list ap; |
| int ret; |
| if (!compat_log) |
| return 0; |
| va_start(ap, fmt); |
| ret = vprintk(fmt, ap); |
| va_end(ap); |
| return ret; |
| } |
| |
| #include "read_write.h" |
| |
| /* |
| * Not all architectures have sys_utime, so implement this in terms |
| * of sys_utimes. |
| */ |
| asmlinkage long compat_sys_utime(const char __user *filename, |
| struct compat_utimbuf __user *t) |
| { |
| struct timespec tv[2]; |
| |
| if (t) { |
| if (get_user(tv[0].tv_sec, &t->actime) || |
| get_user(tv[1].tv_sec, &t->modtime)) |
| return -EFAULT; |
| tv[0].tv_nsec = 0; |
| tv[1].tv_nsec = 0; |
| } |
| return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0); |
| } |
| |
| asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags) |
| { |
| struct timespec tv[2]; |
| |
| if (t) { |
| if (get_compat_timespec(&tv[0], &t[0]) || |
| get_compat_timespec(&tv[1], &t[1])) |
| return -EFAULT; |
| |
| if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT) |
| return 0; |
| } |
| return do_utimes(dfd, filename, t ? tv : NULL, flags); |
| } |
| |
| asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t) |
| { |
| struct timespec tv[2]; |
| |
| if (t) { |
| if (get_user(tv[0].tv_sec, &t[0].tv_sec) || |
| get_user(tv[0].tv_nsec, &t[0].tv_usec) || |
| get_user(tv[1].tv_sec, &t[1].tv_sec) || |
| get_user(tv[1].tv_nsec, &t[1].tv_usec)) |
| return -EFAULT; |
| if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 || |
| tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0) |
| return -EINVAL; |
| tv[0].tv_nsec *= 1000; |
| tv[1].tv_nsec *= 1000; |
| } |
| return do_utimes(dfd, filename, t ? tv : NULL, 0); |
| } |
| |
| asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t) |
| { |
| return compat_sys_futimesat(AT_FDCWD, filename, t); |
| } |
| |
| static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) |
| { |
| struct compat_stat tmp; |
| |
| if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) |
| return -EOVERFLOW; |
| |
| memset(&tmp, 0, sizeof(tmp)); |
| tmp.st_dev = old_encode_dev(stat->dev); |
| tmp.st_ino = stat->ino; |
| if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
| return -EOVERFLOW; |
| tmp.st_mode = stat->mode; |
| tmp.st_nlink = stat->nlink; |
| if (tmp.st_nlink != stat->nlink) |
| return -EOVERFLOW; |
| SET_UID(tmp.st_uid, stat->uid); |
| SET_GID(tmp.st_gid, stat->gid); |
| tmp.st_rdev = old_encode_dev(stat->rdev); |
| if ((u64) stat->size > MAX_NON_LFS) |
| return -EOVERFLOW; |
| tmp.st_size = stat->size; |
| tmp.st_atime = stat->atime.tv_sec; |
| tmp.st_atime_nsec = stat->atime.tv_nsec; |
| tmp.st_mtime = stat->mtime.tv_sec; |
| tmp.st_mtime_nsec = stat->mtime.tv_nsec; |
| tmp.st_ctime = stat->ctime.tv_sec; |
| tmp.st_ctime_nsec = stat->ctime.tv_nsec; |
| tmp.st_blocks = stat->blocks; |
| tmp.st_blksize = stat->blksize; |
| return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| } |
| |
| asmlinkage long compat_sys_newstat(const char __user * filename, |
| struct compat_stat __user *statbuf) |
| { |
| struct kstat stat; |
| int error; |
| |
| error = vfs_stat(filename, &stat); |
| if (error) |
| return error; |
| return cp_compat_stat(&stat, statbuf); |
| } |
| |
| asmlinkage long compat_sys_newlstat(const char __user * filename, |
| struct compat_stat __user *statbuf) |
| { |
| struct kstat stat; |
| int error; |
| |
| error = vfs_lstat(filename, &stat); |
| if (error) |
| return error; |
| return cp_compat_stat(&stat, statbuf); |
| } |
| |
| #ifndef __ARCH_WANT_STAT64 |
| asmlinkage long compat_sys_newfstatat(unsigned int dfd, |
| const char __user *filename, |
| struct compat_stat __user *statbuf, int flag) |
| { |
| struct kstat stat; |
| int error; |
| |
| error = vfs_fstatat(dfd, filename, &stat, flag); |
| if (error) |
| return error; |
| return cp_compat_stat(&stat, statbuf); |
| } |
| #endif |
| |
| asmlinkage long compat_sys_newfstat(unsigned int fd, |
| struct compat_stat __user * statbuf) |
| { |
| struct kstat stat; |
| int error = vfs_fstat(fd, &stat); |
| |
| if (!error) |
| error = cp_compat_stat(&stat, statbuf); |
| return error; |
| } |
| |
| static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf) |
| { |
| |
| if (sizeof ubuf->f_blocks == 4) { |
| if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | |
| kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) |
| return -EOVERFLOW; |
| /* f_files and f_ffree may be -1; it's okay |
| * to stuff that into 32 bits */ |
| if (kbuf->f_files != 0xffffffffffffffffULL |
| && (kbuf->f_files & 0xffffffff00000000ULL)) |
| return -EOVERFLOW; |
| if (kbuf->f_ffree != 0xffffffffffffffffULL |
| && (kbuf->f_ffree & 0xffffffff00000000ULL)) |
| return -EOVERFLOW; |
| } |
| if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || |
| __put_user(kbuf->f_type, &ubuf->f_type) || |
| __put_user(kbuf->f_bsize, &ubuf->f_bsize) || |
| __put_user(kbuf->f_blocks, &ubuf->f_blocks) || |
| __put_user(kbuf->f_bfree, &ubuf->f_bfree) || |
| __put_user(kbuf->f_bavail, &ubuf->f_bavail) || |
| __put_user(kbuf->f_files, &ubuf->f_files) || |
| __put_user(kbuf->f_ffree, &ubuf->f_ffree) || |
| __put_user(kbuf->f_namelen, &ubuf->f_namelen) || |
| __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || |
| __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || |
| __put_user(kbuf->f_frsize, &ubuf->f_frsize) || |
| __put_user(kbuf->f_flags, &ubuf->f_flags) || |
| __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /* |
| * The following statfs calls are copies of code from fs/statfs.c and |
| * should be checked against those from time to time |
| */ |
| asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf) |
| { |
| struct kstatfs tmp; |
| int error = user_statfs(pathname, &tmp); |
| if (!error) |
| error = put_compat_statfs(buf, &tmp); |
| return error; |
| } |
| |
| asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf) |
| { |
| struct kstatfs tmp; |
| int error = fd_statfs(fd, &tmp); |
| if (!error) |
| error = put_compat_statfs(buf, &tmp); |
| return error; |
| } |
| |
| static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf) |
| { |
| if (sizeof ubuf->f_blocks == 4) { |
| if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | |
| kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) |
| return -EOVERFLOW; |
| /* f_files and f_ffree may be -1; it's okay |
| * to stuff that into 32 bits */ |
| if (kbuf->f_files != 0xffffffffffffffffULL |
| && (kbuf->f_files & 0xffffffff00000000ULL)) |
| return -EOVERFLOW; |
| if (kbuf->f_ffree != 0xffffffffffffffffULL |
| && (kbuf->f_ffree & 0xffffffff00000000ULL)) |
| return -EOVERFLOW; |
| } |
| if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || |
| __put_user(kbuf->f_type, &ubuf->f_type) || |
| __put_user(kbuf->f_bsize, &ubuf->f_bsize) || |
| __put_user(kbuf->f_blocks, &ubuf->f_blocks) || |
| __put_user(kbuf->f_bfree, &ubuf->f_bfree) || |
| __put_user(kbuf->f_bavail, &ubuf->f_bavail) || |
| __put_user(kbuf->f_files, &ubuf->f_files) || |
| __put_user(kbuf->f_ffree, &ubuf->f_ffree) || |
| __put_user(kbuf->f_namelen, &ubuf->f_namelen) || |
| __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || |
| __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || |
| __put_user(kbuf->f_frsize, &ubuf->f_frsize) || |
| __put_user(kbuf->f_flags, &ubuf->f_flags) || |
| __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf) |
| { |
| struct kstatfs tmp; |
| int error; |
| |
| if (sz != sizeof(*buf)) |
| return -EINVAL; |
| |
| error = user_statfs(pathname, &tmp); |
| if (!error) |
| error = put_compat_statfs64(buf, &tmp); |
| return error; |
| } |
| |
| asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf) |
| { |
| struct kstatfs tmp; |
| int error; |
| |
| if (sz != sizeof(*buf)) |
| return -EINVAL; |
| |
| error = fd_statfs(fd, &tmp); |
| if (!error) |
| error = put_compat_statfs64(buf, &tmp); |
| return error; |
| } |
| |
| /* |
| * This is a copy of sys_ustat, just dealing with a structure layout. |
| * Given how simple this syscall is that apporach is more maintainable |
| * than the various conversion hacks. |
| */ |
| asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u) |
| { |
| struct compat_ustat tmp; |
| struct kstatfs sbuf; |
| int err = vfs_ustat(new_decode_dev(dev), &sbuf); |
| if (err) |
| return err; |
| |
| memset(&tmp, 0, sizeof(struct compat_ustat)); |
| tmp.f_tfree = sbuf.f_bfree; |
| tmp.f_tinode = sbuf.f_ffree; |
| if (copy_to_user(u, &tmp, sizeof(struct compat_ustat))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) |
| { |
| if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || |
| __get_user(kfl->l_type, &ufl->l_type) || |
| __get_user(kfl->l_whence, &ufl->l_whence) || |
| __get_user(kfl->l_start, &ufl->l_start) || |
| __get_user(kfl->l_len, &ufl->l_len) || |
| __get_user(kfl->l_pid, &ufl->l_pid)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) |
| { |
| if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || |
| __put_user(kfl->l_type, &ufl->l_type) || |
| __put_user(kfl->l_whence, &ufl->l_whence) || |
| __put_user(kfl->l_start, &ufl->l_start) || |
| __put_user(kfl->l_len, &ufl->l_len) || |
| __put_user(kfl->l_pid, &ufl->l_pid)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64 |
| static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) |
| { |
| if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || |
| __get_user(kfl->l_type, &ufl->l_type) || |
| __get_user(kfl->l_whence, &ufl->l_whence) || |
| __get_user(kfl->l_start, &ufl->l_start) || |
| __get_user(kfl->l_len, &ufl->l_len) || |
| __get_user(kfl->l_pid, &ufl->l_pid)) |
| return -EFAULT; |
| return 0; |
| } |
| #endif |
| |
| #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64 |
| static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) |
| { |
| if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || |
| __put_user(kfl->l_type, &ufl->l_type) || |
| __put_user(kfl->l_whence, &ufl->l_whence) || |
| __put_user(kfl->l_start, &ufl->l_start) || |
| __put_user(kfl->l_len, &ufl->l_len) || |
| __put_user(kfl->l_pid, &ufl->l_pid)) |
| return -EFAULT; |
| return 0; |
| } |
| #endif |
| |
| static unsigned int |
| convert_fcntl_cmd(unsigned int cmd) |
| { |
| switch (cmd) { |
| case F_GETLK64: |
| return F_GETLK; |
| case F_SETLK64: |
| return F_SETLK; |
| case F_SETLKW64: |
| return F_SETLKW; |
| } |
| |
| return cmd; |
| } |
| |
| asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, |
| unsigned long arg) |
| { |
| mm_segment_t old_fs; |
| struct flock f; |
| long ret; |
| unsigned int conv_cmd; |
| |
| switch (cmd) { |
| case F_GETLK: |
| case F_SETLK: |
| case F_SETLKW: |
| ret = get_compat_flock(&f, compat_ptr(arg)); |
| if (ret != 0) |
| break; |
| old_fs = get_fs(); |
| set_fs(KERNEL_DS); |
| ret = sys_fcntl(fd, cmd, (unsigned long)&f); |
| set_fs(old_fs); |
| if (cmd == F_GETLK && ret == 0) { |
| /* GETLK was successful and we need to return the data... |
| * but it needs to fit in the compat structure. |
| * l_start shouldn't be too big, unless the original |
| * start + end is greater than COMPAT_OFF_T_MAX, in which |
| * case the app was asking for trouble, so we return |
| * -EOVERFLOW in that case. |
| * l_len could be too big, in which case we just truncate it, |
| * and only allow the app to see that part of the conflicting |
| * lock that might make sense to it anyway |
| */ |
| |
| if (f.l_start > COMPAT_OFF_T_MAX) |
| ret = -EOVERFLOW; |
| if (f.l_len > COMPAT_OFF_T_MAX) |
| f.l_len = COMPAT_OFF_T_MAX; |
| if (ret == 0) |
| ret = put_compat_flock(&f, compat_ptr(arg)); |
| } |
| break; |
| |
| case F_GETLK64: |
| case F_SETLK64: |
| case F_SETLKW64: |
| case F_GETLKP: |
| case F_SETLKP: |
| case F_SETLKPW: |
| ret = get_compat_flock64(&f, compat_ptr(arg)); |
| if (ret != 0) |
| break; |
| old_fs = get_fs(); |
| set_fs(KERNEL_DS); |
| conv_cmd = convert_fcntl_cmd(cmd); |
| ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f); |
| set_fs(old_fs); |
| if ((conv_cmd == F_GETLK || conv_cmd == F_GETLKP) && ret == 0) { |
| /* need to return lock information - see above for commentary */ |
| if (f.l_start > COMPAT_LOFF_T_MAX) |
| ret = -EOVERFLOW; |
| if (f.l_len > COMPAT_LOFF_T_MAX) |
| f.l_len = COMPAT_LOFF_T_MAX; |
| if (ret == 0) |
| ret = put_compat_flock64(&f, compat_ptr(arg)); |
| } |
| break; |
| |
| default: |
| ret = sys_fcntl(fd, cmd, arg); |
| break; |
| } |
| return ret; |
| } |
| |
| asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd, |
| unsigned long arg) |
| { |
| switch (cmd) { |
| case F_GETLK64: |
| case F_SETLK64: |
| case F_SETLKW64: |
| case F_GETLKP: |
| case F_SETLKP: |
| case F_SETLKPW: |
| return -EINVAL; |
| } |
| return compat_sys_fcntl64(fd, cmd, arg); |
| } |
| |
| asmlinkage long |
| compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p) |
| { |
| long ret; |
| aio_context_t ctx64; |
| |
| mm_segment_t oldfs = get_fs(); |
| if (unlikely(get_user(ctx64, ctx32p))) |
| return -EFAULT; |
| |
| set_fs(KERNEL_DS); |
| /* The __user pointer cast is valid because of the set_fs() */ |
| ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64); |
| set_fs(oldfs); |
| /* truncating is ok because it's a user address */ |
| if (!ret) |
| ret = put_user((u32) ctx64, ctx32p); |
| return ret; |
| } |
| |
| asmlinkage long |
| compat_sys_io_getevents(aio_context_t ctx_id, |
| unsigned long min_nr, |
| unsigned long nr, |
| struct io_event __user *events, |
| struct compat_timespec __user *timeout) |
| { |
| long ret; |
| struct timespec t; |
| struct timespec __user *ut = NULL; |
| |
| ret = -EFAULT; |
| if (unlikely(!access_ok(VERIFY_WRITE, events, |
| nr * sizeof(struct io_event)))) |
| goto out; |
| if (timeout) { |
| if (get_compat_timespec(&t, timeout)) |
| goto out; |
| |
| ut = compat_alloc_user_space(sizeof(*ut)); |
| if (copy_to_user(ut, &t, sizeof(t)) ) |
| goto out; |
| } |
| ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut); |
| out: |
| return ret; |
| } |
| |
| /* A write operation does a read from user space and vice versa */ |
| #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
| |
| ssize_t compat_rw_copy_check_uvector(int type, |
| const struct compat_iovec __user *uvector, unsigned long nr_segs, |
| unsigned long fast_segs, struct iovec *fast_pointer, |
| struct iovec **ret_pointer, int check_access) |
| { |
| compat_ssize_t tot_len; |
| struct iovec *iov = *ret_pointer = fast_pointer; |
| ssize_t ret = 0; |
| int seg; |
| |
| /* |
| * SuS says "The readv() function *may* fail if the iovcnt argument |
| * was less than or equal to 0, or greater than {IOV_MAX}. Linux has |
| * traditionally returned zero for zero segments, so... |
| */ |
| if (nr_segs == 0) |
| goto out; |
| |
| ret = -EINVAL; |
| if (nr_segs > UIO_MAXIOV || nr_segs < 0) |
| goto out; |
| if (nr_segs > fast_segs) { |
| ret = -ENOMEM; |
| iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
| if (iov == NULL) |
| goto out; |
| } |
| *ret_pointer = iov; |
| |
| ret = -EFAULT; |
| if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector))) |
| goto out; |
| |
| /* |
| * Single unix specification: |
| * We should -EINVAL if an element length is not >= 0 and fitting an |
| * ssize_t. |
| * |
| * In Linux, the total length is limited to MAX_RW_COUNT, there is |
| * no overflow possibility. |
| */ |
| tot_len = 0; |
| ret = -EINVAL; |
| for (seg = 0; seg < nr_segs; seg++) { |
| compat_uptr_t buf; |
| compat_ssize_t len; |
| |
| if (__get_user(len, &uvector->iov_len) || |
| __get_user(buf, &uvector->iov_base)) { |
| ret = -EFAULT; |
| goto out; |
| } |
| if (len < 0) /* size_t not fitting in compat_ssize_t .. */ |
| goto out; |
| if (check_access && |
| !access_ok(vrfy_dir(type), compat_ptr(buf), len)) { |
| ret = -EFAULT; |
| goto out; |
| } |
| if (len > MAX_RW_COUNT - tot_len) |
| len = MAX_RW_COUNT - tot_len; |
| tot_len += len; |
| iov->iov_base = compat_ptr(buf); |
| iov->iov_len = (compat_size_t) len; |
| uvector++; |
| iov++; |
| } |
| ret = tot_len; |
| |
| out: |
| return ret; |
| } |
| |
| static inline long |
| copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64) |
| { |
| compat_uptr_t uptr; |
| int i; |
| |
| for (i = 0; i < nr; ++i) { |
| if (get_user(uptr, ptr32 + i)) |
| return -EFAULT; |
| if (put_user(compat_ptr(uptr), ptr64 + i)) |
| return -EFAULT; |
| } |
| return 0; |
| } |
| |
| #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *)) |
| |
| asmlinkage long |
| compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb) |
| { |
| struct iocb __user * __user *iocb64; |
| long ret; |
| |
| if (unlikely(nr < 0)) |
| return -EINVAL; |
| |
| if (nr > MAX_AIO_SUBMITS) |
| nr = MAX_AIO_SUBMITS; |
| |
| iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64)); |
| ret = copy_iocb(nr, iocb, iocb64); |
| if (!ret) |
| ret = do_io_submit(ctx_id, nr, iocb64, 1); |
| return ret; |
| } |
| |
| struct compat_ncp_mount_data { |
| compat_int_t version; |
| compat_uint_t ncp_fd; |
| __compat_uid_t mounted_uid; |
| compat_pid_t wdog_pid; |
| unsigned char mounted_vol[NCP_VOLNAME_LEN + 1]; |
| compat_uint_t time_out; |
| compat_uint_t retry_count; |
| compat_uint_t flags; |
| __compat_uid_t uid; |
| __compat_gid_t gid; |
| compat_mode_t file_mode; |
| compat_mode_t dir_mode; |
| }; |
| |
| struct compat_ncp_mount_data_v4 { |
| compat_int_t version; |
| compat_ulong_t flags; |
| compat_ulong_t mounted_uid; |
| compat_long_t wdog_pid; |
| compat_uint_t ncp_fd; |
| compat_uint_t time_out; |
| compat_uint_t retry_count; |
| compat_ulong_t uid; |
| compat_ulong_t gid; |
| compat_ulong_t file_mode; |
| compat_ulong_t dir_mode; |
| }; |
| |
| static void *do_ncp_super_data_conv(void *raw_data) |
| { |
| int version = *(unsigned int *)raw_data; |
| |
| if (version == 3) { |
| struct compat_ncp_mount_data *c_n = raw_data; |
| struct ncp_mount_data *n = raw_data; |
| |
| n->dir_mode = c_n->dir_mode; |
| n->file_mode = c_n->file_mode; |
| n->gid = c_n->gid; |
| n->uid = c_n->uid; |
| memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int))); |
| n->wdog_pid = c_n->wdog_pid; |
| n->mounted_uid = c_n->mounted_uid; |
| } else if (version == 4) { |
| struct compat_ncp_mount_data_v4 *c_n = raw_data; |
| struct ncp_mount_data_v4 *n = raw_data; |
| |
| n->dir_mode = c_n->dir_mode; |
| n->file_mode = c_n->file_mode; |
| n->gid = c_n->gid; |
| n->uid = c_n->uid; |
| n->retry_count = c_n->retry_count; |
| n->time_out = c_n->time_out; |
| n->ncp_fd = c_n->ncp_fd; |
| n->wdog_pid = c_n->wdog_pid; |
| n->mounted_uid = c_n->mounted_uid; |
| n->flags = c_n->flags; |
| } else if (version != 5) { |
| return NULL; |
| } |
| |
| return raw_data; |
| } |
| |
| |
| struct compat_nfs_string { |
| compat_uint_t len; |
| compat_uptr_t data; |
| }; |
| |
| static inline void compat_nfs_string(struct nfs_string *dst, |
| struct compat_nfs_string *src) |
| { |
| dst->data = compat_ptr(src->data); |
| dst->len = src->len; |
| } |
| |
| struct compat_nfs4_mount_data_v1 { |
| compat_int_t version; |
| compat_int_t flags; |
| compat_int_t rsize; |
| compat_int_t wsize; |
| compat_int_t timeo; |
| compat_int_t retrans; |
| compat_int_t acregmin; |
| compat_int_t acregmax; |
| compat_int_t acdirmin; |
| compat_int_t acdirmax; |
| struct compat_nfs_string client_addr; |
| struct compat_nfs_string mnt_path; |
| struct compat_nfs_string hostname; |
| compat_uint_t host_addrlen; |
| compat_uptr_t host_addr; |
| compat_int_t proto; |
| compat_int_t auth_flavourlen; |
| compat_uptr_t auth_flavours; |
| }; |
| |
| static int do_nfs4_super_data_conv(void *raw_data) |
| { |
| int version = *(compat_uint_t *) raw_data; |
| |
| if (version == 1) { |
| struct compat_nfs4_mount_data_v1 *raw = raw_data; |
| struct nfs4_mount_data *real = raw_data; |
| |
| /* copy the fields backwards */ |
| real->auth_flavours = compat_ptr(raw->auth_flavours); |
| real->auth_flavourlen = raw->auth_flavourlen; |
| real->proto = raw->proto; |
| real->host_addr = compat_ptr(raw->host_addr); |
| real->host_addrlen = raw->host_addrlen; |
| compat_nfs_string(&real->hostname, &raw->hostname); |
| compat_nfs_string(&real->mnt_path, &raw->mnt_path); |
| compat_nfs_string(&real->client_addr, &raw->client_addr); |
| real->acdirmax = raw->acdirmax; |
| real->acdirmin = raw->acdirmin; |
| real->acregmax = raw->acregmax; |
| real->acregmin = raw->acregmin; |
| real->retrans = raw->retrans; |
| real->timeo = raw->timeo; |
| real->wsize = raw->wsize; |
| real->rsize = raw->rsize; |
| real->flags = raw->flags; |
| real->version = raw->version; |
| } |
| |
| return 0; |
| } |
| |
| #define NCPFS_NAME "ncpfs" |
| #define NFS4_NAME "nfs4" |
| |
| asmlinkage long compat_sys_mount(const char __user * dev_name, |
| const char __user * dir_name, |
| const char __user * type, unsigned long flags, |
| const void __user * data) |
| { |
| char *kernel_type; |
| unsigned long data_page; |
| char *kernel_dev; |
| struct filename *dir; |
| int retval; |
| |
| retval = copy_mount_string(type, &kernel_type); |
| if (retval < 0) |
| goto out; |
| |
| dir = getname(dir_name); |
| retval = PTR_ERR(dir); |
| if (IS_ERR(dir)) |
| goto out1; |
| |
| retval = copy_mount_string(dev_name, &kernel_dev); |
| if (retval < 0) |
| goto out2; |
| |
| retval = copy_mount_options(data, &data_page); |
| if (retval < 0) |
| goto out3; |
| |
| retval = -EINVAL; |
| |
| if (kernel_type && data_page) { |
| if (!strcmp(kernel_type, NCPFS_NAME)) { |
| do_ncp_super_data_conv((void *)data_page); |
| } else if (!strcmp(kernel_type, NFS4_NAME)) { |
| if (do_nfs4_super_data_conv((void *) data_page)) |
| goto out4; |
| } |
| } |
| |
| retval = do_mount(kernel_dev, dir->name, kernel_type, |
| flags, (void*)data_page); |
| |
| out4: |
| free_page(data_page); |
| out3: |
| kfree(kernel_dev); |
| out2: |
| putname(dir); |
| out1: |
| kfree(kernel_type); |
| out: |
| return retval; |
| } |
| |
| struct compat_old_linux_dirent { |
| compat_ulong_t d_ino; |
| compat_ulong_t d_offset; |
| unsigned short d_namlen; |
| char d_name[1]; |
| }; |
| |
| struct compat_readdir_callback { |
| struct compat_old_linux_dirent __user *dirent; |
| int result; |
| }; |
| |
| static int compat_fillonedir(void *__buf, const char *name, int namlen, |
| loff_t offset, u64 ino, unsigned int d_type) |
| { |
| struct compat_readdir_callback *buf = __buf; |
| struct compat_old_linux_dirent __user *dirent; |
| compat_ulong_t d_ino; |
| |
| if (buf->result) |
| return -EINVAL; |
| d_ino = ino; |
| if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
| buf->result = -EOVERFLOW; |
| return -EOVERFLOW; |
| } |
| buf->result++; |
| dirent = buf->dirent; |
| if (!access_ok(VERIFY_WRITE, dirent, |
| (unsigned long)(dirent->d_name + namlen + 1) - |
| (unsigned long)dirent)) |
| goto efault; |
| if ( __put_user(d_ino, &dirent->d_ino) || |
| __put_user(offset, &dirent->d_offset) || |
| __put_user(namlen, &dirent->d_namlen) || |
| __copy_to_user(dirent->d_name, name, namlen) || |
| __put_user(0, dirent->d_name + namlen)) |
| goto efault; |
| return 0; |
| efault: |
| buf->result = -EFAULT; |
| return -EFAULT; |
| } |
| |
| asmlinkage long compat_sys_old_readdir(unsigned int fd, |
| struct compat_old_linux_dirent __user *dirent, unsigned int count) |
| { |
| int error; |
| struct file *file; |
| struct compat_readdir_callback buf; |
| |
| error = -EBADF; |
| file = fget(fd); |
| if (!file) |
| goto out; |
| |
| buf.result = 0; |
| buf.dirent = dirent; |
| |
| error = vfs_readdir(file, compat_fillonedir, &buf); |
| if (buf.result) |
| error = buf.result; |
| |
| fput(file); |
| out: |
| return error; |
| } |
| |
| struct compat_linux_dirent { |
| compat_ulong_t d_ino; |
| compat_ulong_t d_off; |
| unsigned short d_reclen; |
| char d_name[1]; |
| }; |
| |
| struct compat_getdents_callback { |
| struct compat_linux_dirent __user *current_dir; |
| struct compat_linux_dirent __user *previous; |
| int count; |
| int error; |
| }; |
| |
| static int compat_filldir(void *__buf, const char *name, int namlen, |
| loff_t offset, u64 ino, unsigned int d_type) |
| { |
| struct compat_linux_dirent __user * dirent; |
| struct compat_getdents_callback *buf = __buf; |
| compat_ulong_t d_ino; |
| int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) + |
| namlen + 2, sizeof(compat_long_t)); |
| |
| buf->error = -EINVAL; /* only used if we fail.. */ |
| if (reclen > buf->count) |
| return -EINVAL; |
| d_ino = ino; |
| if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
| buf->error = -EOVERFLOW; |
| return -EOVERFLOW; |
| } |
| dirent = buf->previous; |
| if (dirent) { |
| if (__put_user(offset, &dirent->d_off)) |
| goto efault; |
| } |
| dirent = buf->current_dir; |
| if (__put_user(d_ino, &dirent->d_ino)) |
| goto efault; |
| if (__put_user(reclen, &dirent->d_reclen)) |
| goto efault; |
| if (copy_to_user(dirent->d_name, name, namlen)) |
| goto efault; |
| if (__put_user(0, dirent->d_name + namlen)) |
| goto efault; |
| if (__put_user(d_type, (char __user *) dirent + reclen - 1)) |
| goto efault; |
| buf->previous = dirent; |
| dirent = (void __user *)dirent + reclen; |
| buf->current_dir = dirent; |
| buf->count -= reclen; |
| return 0; |
| efault: |
| buf->error = -EFAULT; |
| return -EFAULT; |
| } |
| |
| asmlinkage long compat_sys_getdents(unsigned int fd, |
| struct compat_linux_dirent __user *dirent, unsigned int count) |
| { |
| struct file * file; |
| struct compat_linux_dirent __user * lastdirent; |
| struct compat_getdents_callback buf; |
| int error; |
| |
| error = -EFAULT; |
| if (!access_ok(VERIFY_WRITE, dirent, count)) |
| goto out; |
| |
| error = -EBADF; |
| file = fget(fd); |
| if (!file) |
| goto out; |
| |
| buf.current_dir = dirent; |
| buf.previous = NULL; |
| buf.count = count; |
| buf.error = 0; |
| |
| error = vfs_readdir(file, compat_filldir, &buf); |
| if (error >= 0) |
| error = buf.error; |
| lastdirent = buf.previous; |
| if (lastdirent) { |
| if (put_user(file->f_pos, &lastdirent->d_off)) |
| error = -EFAULT; |
| else |
| error = count - buf.count; |
| } |
| fput(file); |
| out: |
| return error; |
| } |
| |
| #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64 |
| |
| struct compat_getdents_callback64 { |
| struct linux_dirent64 __user *current_dir; |
| struct linux_dirent64 __user *previous; |
| int count; |
| int error; |
| }; |
| |
| static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset, |
| u64 ino, unsigned int d_type) |
| { |
| struct linux_dirent64 __user *dirent; |
| struct compat_getdents_callback64 *buf = __buf; |
| int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1, |
| sizeof(u64)); |
| u64 off; |
| |
| buf->error = -EINVAL; /* only used if we fail.. */ |
| if (reclen > buf->count) |
| return -EINVAL; |
| dirent = buf->previous; |
| |
| if (dirent) { |
| if (__put_user_unaligned(offset, &dirent->d_off)) |
| goto efault; |
| } |
| dirent = buf->current_dir; |
| if (__put_user_unaligned(ino, &dirent->d_ino)) |
| goto efault; |
| off = 0; |
| if (__put_user_unaligned(off, &dirent->d_off)) |
| goto efault; |
| if (__put_user(reclen, &dirent->d_reclen)) |
| goto efault; |
| if (__put_user(d_type, &dirent->d_type)) |
| goto efault; |
| if (copy_to_user(dirent->d_name, name, namlen)) |
| goto efault; |
| if (__put_user(0, dirent->d_name + namlen)) |
| goto efault; |
| buf->previous = dirent; |
| dirent = (void __user *)dirent + reclen; |
| buf->current_dir = dirent; |
| buf->count -= reclen; |
| return 0; |
| efault: |
| buf->error = -EFAULT; |
| return -EFAULT; |
| } |
| |
| asmlinkage long compat_sys_getdents64(unsigned int fd, |
| struct linux_dirent64 __user * dirent, unsigned int count) |
| { |
| struct file * file; |
| struct linux_dirent64 __user * lastdirent; |
| struct compat_getdents_callback64 buf; |
| int error; |
| |
| error = -EFAULT; |
| if (!access_ok(VERIFY_WRITE, dirent, count)) |
| goto out; |
| |
| error = -EBADF; |
| file = fget(fd); |
| if (!file) |
| goto out; |
| |
| buf.current_dir = dirent; |
| buf.previous = NULL; |
| buf.count = count; |
| buf.error = 0; |
| |
| error = vfs_readdir(file, compat_filldir64, &buf); |
| if (error >= 0) |
| error = buf.error; |
| lastdirent = buf.previous; |
| if (lastdirent) { |
| typeof(lastdirent->d_off) d_off = file->f_pos; |
| if (__put_user_unaligned(d_off, &lastdirent->d_off)) |
| error = -EFAULT; |
| else |
| error = count - buf.count; |
| } |
| fput(file); |
| out: |
| return error; |
| } |
| #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */ |
| |
| static ssize_t compat_do_readv_writev(int type, struct file *file, |
| const struct compat_iovec __user *uvector, |
| unsigned long nr_segs, loff_t *pos) |
| { |
| compat_ssize_t tot_len; |
| struct iovec iovstack[UIO_FASTIOV]; |
| struct iovec *iov = iovstack; |
| ssize_t ret; |
| io_fn_t fn; |
| iov_fn_t fnv; |
| |
| ret = -EINVAL; |
| if (!file->f_op) |
| goto out; |
| |
| ret = compat_rw_copy_check_uvector(type, uvector, nr_segs, |
| UIO_FASTIOV, iovstack, &iov, 1); |
| if (ret <= 0) |
| goto out; |
| |
| tot_len = ret; |
| ret = rw_verify_area(type, file, pos, tot_len); |
| if (ret < 0) |
| goto out; |
| |
| fnv = NULL; |
| if (type == READ) { |
| fn = file->f_op->read; |
| fnv = file->f_op->aio_read; |
| } else { |
| fn = (io_fn_t)file->f_op->write; |
| fnv = file->f_op->aio_write; |
| } |
| |
| if (fnv) |
| ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
| pos, fnv); |
| else |
| ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
| |
| out: |
| if (iov != iovstack) |
| kfree(iov); |
| if ((ret + (type == READ)) > 0) { |
| if (type == READ) |
| fsnotify_access(file); |
| else |
| fsnotify_modify(file); |
| } |
| return ret; |
| } |
| |
| static size_t compat_readv(struct file *file, |
| const struct compat_iovec __user *vec, |
| unsigned long vlen, loff_t *pos) |
| { |
| ssize_t ret = -EBADF; |
| |
| if (!(file->f_mode & FMODE_READ)) |
| goto out; |
| |
| ret = -EINVAL; |
| if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read)) |
| goto out; |
| |
| ret = compat_do_readv_writev(READ, file, vec, vlen, pos); |
| |
| out: |
| if (ret > 0) |
| add_rchar(current, ret); |
| inc_syscr(current); |
| return ret; |
| } |
| |
| asmlinkage ssize_t |
| compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, |
| unsigned long vlen) |
| { |
| struct file *file; |
| int fput_needed; |
| ssize_t ret; |
| loff_t pos; |
| |
| file = fget_light(fd, &fput_needed); |
| if (!file) |
| return -EBADF; |
| pos = file->f_pos; |
| ret = compat_readv(file, vec, vlen, &pos); |
| file->f_pos = pos; |
| fput_light(file, fput_needed); |
| return ret; |
| } |
| |
| asmlinkage ssize_t |
| compat_sys_preadv64(unsigned long fd, const struct compat_iovec __user *vec, |
| unsigned long vlen, loff_t pos) |
| { |
| struct file *file; |
| int fput_needed; |
| ssize_t ret; |
| |
| if (pos < 0) |
| return -EINVAL; |
| file = fget_light(fd, &fput_needed); |
| if (!file) |
| return -EBADF; |
| ret = -ESPIPE; |
| if (file->f_mode & FMODE_PREAD) |
| ret = compat_readv(file, vec, vlen, &pos); |
| fput_light(file, fput_needed); |
| return ret; |
| } |
| |
| asmlinkage ssize_t |
| compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec, |
| unsigned long vlen, u32 pos_low, u32 pos_high) |
| { |
| loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
| return compat_sys_preadv64(fd, vec, vlen, pos); |
| } |
| |
| static size_t compat_writev(struct file *file, |
| const struct compat_iovec __user *vec, |
| unsigned long vlen, loff_t *pos) |
| { |
| ssize_t ret = -EBADF; |
| |
| if (!(file->f_mode & FMODE_WRITE)) |
| goto out; |
| |
| ret = -EINVAL; |
| if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write)) |
| goto out; |
| |
| ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos); |
| |
| out: |
| if (ret > 0) |
| add_wchar(current, ret); |
| inc_syscw(current); |
| return ret; |
| } |
| |
| asmlinkage ssize_t |
| compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, |
| unsigned long vlen) |
| { |
| struct file *file; |
| int fput_needed; |
| ssize_t ret; |
| loff_t pos; |
| |
| file = fget_light(fd, &fput_needed); |
| if (!file) |
| return -EBADF; |
| pos = file->f_pos; |
| ret = compat_writev(file, vec, vlen, &pos); |
| file->f_pos = pos; |
| fput_light(file, fput_needed); |
| return ret; |
| } |
| |
| asmlinkage ssize_t |
| compat_sys_pwritev64(unsigned long fd, const struct compat_iovec __user *vec, |
| unsigned long vlen, loff_t pos) |
| { |
| struct file *file; |
| int fput_needed; |
| ssize_t ret; |
| |
| if (pos < 0) |
| return -EINVAL; |
| file = fget_light(fd, &fput_needed); |
| if (!file) |
| return -EBADF; |
| ret = -ESPIPE; |
| if (file->f_mode & FMODE_PWRITE) |
| ret = compat_writev(file, vec, vlen, &pos); |
| fput_light(file, fput_needed); |
| return ret; |
| } |
| |
| asmlinkage ssize_t |
| compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec, |
| unsigned long vlen, u32 pos_low, u32 pos_high) |
| { |
| loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
| return compat_sys_pwritev64(fd, vec, vlen, pos); |
| } |
| |
| asmlinkage long |
| compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32, |
| unsigned int nr_segs, unsigned int flags) |
| { |
| unsigned i; |
| struct iovec __user *iov; |
| if (nr_segs > UIO_MAXIOV) |
| return -EINVAL; |
| iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec)); |
| for (i = 0; i < nr_segs; i++) { |
| struct compat_iovec v; |
| if (get_user(v.iov_base, &iov32[i].iov_base) || |
| get_user(v.iov_len, &iov32[i].iov_len) || |
| put_user(compat_ptr(v.iov_base), &iov[i].iov_base) || |
| put_user(v.iov_len, &iov[i].iov_len)) |
| return -EFAULT; |
| } |
| return sys_vmsplice(fd, iov, nr_segs, flags); |
| } |
| |
| /* |
| * Exactly like fs/open.c:sys_open(), except that it doesn't set the |
| * O_LARGEFILE flag. |
| */ |
| asmlinkage long |
| compat_sys_open(const char __user *filename, int flags, umode_t mode) |
| { |
| return do_sys_open(AT_FDCWD, filename, flags, mode); |
| } |
| |
| /* |
| * Exactly like fs/open.c:sys_openat(), except that it doesn't set the |
| * O_LARGEFILE flag. |
| */ |
| asmlinkage long |
| compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, umode_t mode) |
| { |
| return do_sys_open(dfd, filename, flags, mode); |
| } |
| |
| #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) |
| |
| static int poll_select_copy_remaining(struct timespec *end_time, void __user *p, |
| int timeval, int ret) |
| { |
| struct timespec ts; |
| |
| if (!p) |
| return ret; |
| |
| if (current->personality & STICKY_TIMEOUTS) |
| goto sticky; |
| |
| /* No update for zero timeout */ |
| if (!end_time->tv_sec && !end_time->tv_nsec) |
| return ret; |
| |
| ktime_get_ts(&ts); |
| ts = timespec_sub(*end_time, ts); |
| if (ts.tv_sec < 0) |
| ts.tv_sec = ts.tv_nsec = 0; |
| |
| if (timeval) { |
| struct compat_timeval rtv; |
| |
| rtv.tv_sec = ts.tv_sec; |
| rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC; |
| |
| if (!copy_to_user(p, &rtv, sizeof(rtv))) |
| return ret; |
| } else { |
| struct compat_timespec rts; |
| |
| rts.tv_sec = ts.tv_sec; |
| rts.tv_nsec = ts.tv_nsec; |
| |
| if (!copy_to_user(p, &rts, sizeof(rts))) |
| return ret; |
| } |
| /* |
| * If an application puts its timeval in read-only memory, we |
| * don't want the Linux-specific update to the timeval to |
| * cause a fault after the select has completed |
| * successfully. However, because we're not updating the |
| * timeval, we can't restart the system call. |
| */ |
| |
| sticky: |
| if (ret == -ERESTARTNOHAND) |
| ret = -EINTR; |
| return ret; |
| } |
| |
| /* |
| * Ooo, nasty. We need here to frob 32-bit unsigned longs to |
| * 64-bit unsigned longs. |
| */ |
| static |
| int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
| unsigned long *fdset) |
| { |
| nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
| if (ufdset) { |
| unsigned long odd; |
| |
| if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t))) |
| return -EFAULT; |
| |
| odd = nr & 1UL; |
| nr &= ~1UL; |
| while (nr) { |
| unsigned long h, l; |
| if (__get_user(l, ufdset) || __get_user(h, ufdset+1)) |
| return -EFAULT; |
| ufdset += 2; |
| *fdset++ = h << 32 | l; |
| nr -= 2; |
| } |
| if (odd && __get_user(*fdset, ufdset)) |
| return -EFAULT; |
| } else { |
| /* Tricky, must clear full unsigned long in the |
| * kernel fdset at the end, this makes sure that |
| * actually happens. |
| */ |
| memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t)); |
| } |
| return 0; |
| } |
| |
| static |
| int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
| unsigned long *fdset) |
| { |
| unsigned long odd; |
| nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
| |
| if (!ufdset) |
| return 0; |
| |
| odd = nr & 1UL; |
| nr &= ~1UL; |
| while (nr) { |
| unsigned long h, l; |
| l = *fdset++; |
| h = l >> 32; |
| if (__put_user(l, ufdset) || __put_user(h, ufdset+1)) |
| return -EFAULT; |
| ufdset += 2; |
| nr -= 2; |
| } |
| if (odd && __put_user(*fdset, ufdset)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| |
| /* |
| * This is a virtual copy of sys_select from fs/select.c and probably |
| * should be compared to it from time to time |
| */ |
| |
| /* |
| * We can actually return ERESTARTSYS instead of EINTR, but I'd |
| * like to be certain this leads to no problems. So I return |
| * EINTR just for safety. |
| * |
| * Update: ERESTARTSYS breaks at least the xview clock binary, so |
| * I'm trying ERESTARTNOHAND which restart only when you want to. |
| */ |
| int compat_core_sys_select(int n, compat_ulong_t __user *inp, |
| compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
| struct timespec *end_time) |
| { |
| fd_set_bits fds; |
| void *bits; |
| int size, max_fds, ret = -EINVAL; |
| struct fdtable *fdt; |
| long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; |
| |
| if (n < 0) |
| goto out_nofds; |
| |
| /* max_fds can increase, so grab it once to avoid race */ |
| rcu_read_lock(); |
| fdt = files_fdtable(current->files); |
| max_fds = fdt->max_fds; |
| rcu_read_unlock(); |
| if (n > max_fds) |
| n = max_fds; |
| |
| /* |
| * We need 6 bitmaps (in/out/ex for both incoming and outgoing), |
| * since we used fdset we need to allocate memory in units of |
| * long-words. |
| */ |
| size = FDS_BYTES(n); |
| bits = stack_fds; |
| if (size > sizeof(stack_fds) / 6) { |
| bits = kmalloc(6 * size, GFP_KERNEL); |
| ret = -ENOMEM; |
| if (!bits) |
| goto out_nofds; |
| } |
| fds.in = (unsigned long *) bits; |
| fds.out = (unsigned long *) (bits + size); |
| fds.ex = (unsigned long *) (bits + 2*size); |
| fds.res_in = (unsigned long *) (bits + 3*size); |
| fds.res_out = (unsigned long *) (bits + 4*size); |
| fds.res_ex = (unsigned long *) (bits + 5*size); |
| |
| if ((ret = compat_get_fd_set(n, inp, fds.in)) || |
| (ret = compat_get_fd_set(n, outp, fds.out)) || |
| (ret = compat_get_fd_set(n, exp, fds.ex))) |
| goto out; |
| zero_fd_set(n, fds.res_in); |
| zero_fd_set(n, fds.res_out); |
| zero_fd_set(n, fds.res_ex); |
| |
| ret = do_select(n, &fds, end_time); |
| |
| if (ret < 0) |
| goto out; |
| if (!ret) { |
| ret = -ERESTARTNOHAND; |
| if (signal_pending(current)) |
| goto out; |
| ret = 0; |
| } |
| |
| if (compat_set_fd_set(n, inp, fds.res_in) || |
| compat_set_fd_set(n, outp, fds.res_out) || |
| compat_set_fd_set(n, exp, fds.res_ex)) |
| ret = -EFAULT; |
| out: |
| if (bits != stack_fds) |
| kfree(bits); |
| out_nofds: |
| return ret; |
| } |
| |
| asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp, |
| compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
| struct compat_timeval __user *tvp) |
| { |
| struct timespec end_time, *to = NULL; |
| struct compat_timeval tv; |
| int ret; |
| |
| if (tvp) { |
| if (copy_from_user(&tv, tvp, sizeof(tv))) |
| return -EFAULT; |
| |
| to = &end_time; |
| if (poll_select_set_timeout(to, |
| tv.tv_sec + (tv.tv_usec / USEC_PER_SEC), |
| (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC)) |
| return -EINVAL; |
| } |
| |
| ret = compat_core_sys_select(n, inp, outp, exp, to); |
| ret = poll_select_copy_remaining(&end_time, tvp, 1, ret); |
| |
| return ret; |
| } |
| |
| struct compat_sel_arg_struct { |
| compat_ulong_t n; |
| compat_uptr_t inp; |
| compat_uptr_t outp; |
| compat_uptr_t exp; |
| compat_uptr_t tvp; |
| }; |
| |
| asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg) |
| { |
| struct compat_sel_arg_struct a; |
| |
| if (copy_from_user(&a, arg, sizeof(a))) |
| return -EFAULT; |
| return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp), |
| compat_ptr(a.exp), compat_ptr(a.tvp)); |
| } |
| |
| #ifdef HAVE_SET_RESTORE_SIGMASK |
| static long do_compat_pselect(int n, compat_ulong_t __user *inp, |
| compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
| struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask, |
| compat_size_t sigsetsize) |
| { |
| compat_sigset_t ss32; |
| sigset_t ksigmask, sigsaved; |
| struct compat_timespec ts; |
| struct timespec end_time, *to = NULL; |
| int ret; |
| |
| if (tsp) { |
| if (copy_from_user(&ts, tsp, sizeof(ts))) |
| return -EFAULT; |
| |
| to = &end_time; |
| if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) |
| return -EINVAL; |
| } |
| |
| if (sigmask) { |
| if (sigsetsize != sizeof(compat_sigset_t)) |
| return -EINVAL; |
| if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
| return -EFAULT; |
| sigset_from_compat(&ksigmask, &ss32); |
| |
| sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
| sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
| } |
| |
| ret = compat_core_sys_select(n, inp, outp, exp, to); |
| ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); |
| |
| if (ret == -ERESTARTNOHAND) { |
| /* |
| * Don't restore the signal mask yet. Let do_signal() deliver |
| * the signal on the way back to userspace, before the signal |
| * mask is restored. |
| */ |
| if (sigmask) { |
| memcpy(¤t->saved_sigmask, &sigsaved, |
| sizeof(sigsaved)); |
| set_restore_sigmask(); |
| } |
| } else if (sigmask) |
| sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
| |
| return ret; |
| } |
| |
| asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp, |
| compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
| struct compat_timespec __user *tsp, void __user *sig) |
| { |
| compat_size_t sigsetsize = 0; |
| compat_uptr_t up = 0; |
| |
| if (sig) { |
| if (!access_ok(VERIFY_READ, sig, |
| sizeof(compat_uptr_t)+sizeof(compat_size_t)) || |
| __get_user(up, (compat_uptr_t __user *)sig) || |
| __get_user(sigsetsize, |
| (compat_size_t __user *)(sig+sizeof(up)))) |
| return -EFAULT; |
| } |
| return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up), |
| sigsetsize); |
| } |
| |
| asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds, |
| unsigned int nfds, struct compat_timespec __user *tsp, |
| const compat_sigset_t __user *sigmask, compat_size_t sigsetsize) |
| { |
| compat_sigset_t ss32; |
| sigset_t ksigmask, sigsaved; |
| struct compat_timespec ts; |
| struct timespec end_time, *to = NULL; |
| int ret; |
| |
| if (tsp) { |
| if (copy_from_user(&ts, tsp, sizeof(ts))) |
| return -EFAULT; |
| |
| to = &end_time; |
| if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) |
| return -EINVAL; |
| } |
| |
| if (sigmask) { |
| if (sigsetsize != sizeof(compat_sigset_t)) |
| return -EINVAL; |
| if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
| return -EFAULT; |
| sigset_from_compat(&ksigmask, &ss32); |
| |
| sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
| sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
| } |
| |
| ret = do_sys_poll(ufds, nfds, to); |
| |
| /* We can restart this syscall, usually */ |
| if (ret == -EINTR) { |
| /* |
| * Don't restore the signal mask yet. Let do_signal() deliver |
| * the signal on the way back to userspace, before the signal |
| * mask is restored. |
| */ |
| if (sigmask) { |
| memcpy(¤t->saved_sigmask, &sigsaved, |
| sizeof(sigsaved)); |
| set_restore_sigmask(); |
| } |
| ret = -ERESTARTNOHAND; |
| } else if (sigmask) |
| sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
| |
| ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); |
| |
| return ret; |
| } |
| #endif /* HAVE_SET_RESTORE_SIGMASK */ |
| |
| #ifdef CONFIG_EPOLL |
| |
| #ifdef HAVE_SET_RESTORE_SIGMASK |
| asmlinkage long compat_sys_epoll_pwait(int epfd, |
| struct compat_epoll_event __user *events, |
| int maxevents, int timeout, |
| const compat_sigset_t __user *sigmask, |
| compat_size_t sigsetsize) |
| { |
| long err; |
| compat_sigset_t csigmask; |
| sigset_t ksigmask, sigsaved; |
| |
| /* |
| * If the caller wants a certain signal mask to be set during the wait, |
| * we apply it here. |
| */ |
| if (sigmask) { |
| if (sigsetsize != sizeof(compat_sigset_t)) |
| return -EINVAL; |
| if (copy_from_user(&csigmask, sigmask, sizeof(csigmask))) |
| return -EFAULT; |
| sigset_from_compat(&ksigmask, &csigmask); |
| sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP)); |
| sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
| } |
| |
| err = sys_epoll_wait(epfd, events, maxevents, timeout); |
| |
| /* |
| * If we changed the signal mask, we need to restore the original one. |
| * In case we've got a signal while waiting, we do not restore the |
| * signal mask yet, and we allow do_signal() to deliver the signal on |
| * the way back to userspace, before the signal mask is restored. |
| */ |
| if (sigmask) { |
| if (err == -EINTR) { |
| memcpy(¤t->saved_sigmask, &sigsaved, |
| sizeof(sigsaved)); |
| set_restore_sigmask(); |
| } else |
| sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
| } |
| |
| return err; |
| } |
| #endif /* HAVE_SET_RESTORE_SIGMASK */ |
| |
| #endif /* CONFIG_EPOLL */ |
| |
| #ifdef CONFIG_SIGNALFD |
| |
| asmlinkage long compat_sys_signalfd4(int ufd, |
| const compat_sigset_t __user *sigmask, |
| compat_size_t sigsetsize, int flags) |
| { |
| compat_sigset_t ss32; |
| sigset_t tmp; |
| sigset_t __user *ksigmask; |
| |
| if (sigsetsize != sizeof(compat_sigset_t)) |
| return -EINVAL; |
| if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
| return -EFAULT; |
| sigset_from_compat(&tmp, &ss32); |
| ksigmask = compat_alloc_user_space(sizeof(sigset_t)); |
| if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t))) |
| return -EFAULT; |
| |
| return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags); |
| } |
| |
| asmlinkage long compat_sys_signalfd(int ufd, |
| const compat_sigset_t __user *sigmask, |
| compat_size_t sigsetsize) |
| { |
| return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0); |
| } |
| #endif /* CONFIG_SIGNALFD */ |
| |
| #ifdef CONFIG_TIMERFD |
| |
| asmlinkage long compat_sys_timerfd_settime(int ufd, int flags, |
| const struct compat_itimerspec __user *utmr, |
| struct compat_itimerspec __user *otmr) |
| { |
| int error; |
| struct itimerspec t; |
| struct itimerspec __user *ut; |
| |
| if (get_compat_itimerspec(&t, utmr)) |
| return -EFAULT; |
| ut = compat_alloc_user_space(2 * sizeof(struct itimerspec)); |
| if (copy_to_user(&ut[0], &t, sizeof(t))) |
| return -EFAULT; |
| error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]); |
| if (!error && otmr) |
| error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) || |
| put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0; |
| |
| return error; |
| } |
| |
| asmlinkage long compat_sys_timerfd_gettime(int ufd, |
| struct compat_itimerspec __user *otmr) |
| { |
| int error; |
| struct itimerspec t; |
| struct itimerspec __user *ut; |
| |
| ut = compat_alloc_user_space(sizeof(struct itimerspec)); |
| error = sys_timerfd_gettime(ufd, ut); |
| if (!error) |
| error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) || |
| put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0; |
| |
| return error; |
| } |
| |
| #endif /* CONFIG_TIMERFD */ |
| |
| #ifdef CONFIG_FHANDLE |
| /* |
| * Exactly like fs/open.c:sys_open_by_handle_at(), except that it |
| * doesn't set the O_LARGEFILE flag. |
| */ |
| asmlinkage long |
| compat_sys_open_by_handle_at(int mountdirfd, |
| struct file_handle __user *handle, int flags) |
| { |
| return do_handle_open(mountdirfd, handle, flags); |
| } |
| #endif |