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-rw-r--r--fs/compat.c1191
1 files changed, 0 insertions, 1191 deletions
diff --git a/fs/compat.c b/fs/compat.c
index c61b506f5bc9..190b38b39d9e 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -15,555 +15,14 @@
* 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/cred.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/fs_struct.h>
#include <linux/slab.h>
-#include <linux/pagemap.h>
-#include <linux/aio.h>
-
#include <linux/uaccess.h>
-#include <asm/mmu_context.h>
-#include <asm/ioctls.h>
#include "internal.h"
-/*
- * Not all architectures have sys_utime, so implement this in terms
- * of sys_utimes.
- */
-COMPAT_SYSCALL_DEFINE2(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);
-}
-
-COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags)
-{
- struct timespec tv[2];
-
- if (t) {
- if (compat_get_timespec(&tv[0], &t[0]) ||
- compat_get_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);
-}
-
-COMPAT_SYSCALL_DEFINE3(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);
-}
-
-COMPAT_SYSCALL_DEFINE2(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, from_kuid_munged(current_user_ns(), stat->uid));
- SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), 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;
-}
-
-COMPAT_SYSCALL_DEFINE2(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);
-}
-
-COMPAT_SYSCALL_DEFINE2(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
-COMPAT_SYSCALL_DEFINE4(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
-
-COMPAT_SYSCALL_DEFINE2(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
- */
-COMPAT_SYSCALL_DEFINE2(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;
-}
-
-COMPAT_SYSCALL_DEFINE2(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_bsize) == 4) {
- if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen |
- kbuf->f_frsize | kbuf->f_flags) & 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;
-}
-
-COMPAT_SYSCALL_DEFINE3(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;
-}
-
-COMPAT_SYSCALL_DEFINE3(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.
- */
-COMPAT_SYSCALL_DEFINE2(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;
-}
-
-COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
- compat_ulong_t, 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_OFD_GETLK:
- case F_OFD_SETLK:
- case F_OFD_SETLKW:
- 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_OFD_GETLK) && 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;
-}
-
-COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
- compat_ulong_t, arg)
-{
- switch (cmd) {
- case F_GETLK64:
- case F_SETLK64:
- case F_SETLKW64:
- case F_OFD_GETLK:
- case F_OFD_SETLK:
- case F_OFD_SETLKW:
- return -EINVAL;
- }
- return compat_sys_fcntl64(fd, cmd, arg);
-}
-
-/* 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)
-{
- 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)
- 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 (type >= 0 &&
- !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;
-}
-
struct compat_ncp_mount_data {
compat_int_t version;
compat_uint_t ncp_fd;
@@ -744,653 +203,3 @@ COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
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 dir_context ctx;
- struct compat_old_linux_dirent __user *dirent;
- int result;
-};
-
-static int compat_fillonedir(struct dir_context *ctx, const char *name,
- int namlen, loff_t offset, u64 ino,
- unsigned int d_type)
-{
- struct compat_readdir_callback *buf =
- container_of(ctx, struct compat_readdir_callback, ctx);
- 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;
-}
-
-COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
- struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
-{
- int error;
- struct fd f = fdget_pos(fd);
- struct compat_readdir_callback buf = {
- .ctx.actor = compat_fillonedir,
- .dirent = dirent
- };
-
- if (!f.file)
- return -EBADF;
-
- error = iterate_dir(f.file, &buf.ctx);
- if (buf.result)
- error = buf.result;
-
- fdput_pos(f);
- 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 dir_context ctx;
- struct compat_linux_dirent __user *current_dir;
- struct compat_linux_dirent __user *previous;
- int count;
- int error;
-};
-
-static int compat_filldir(struct dir_context *ctx, 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 =
- container_of(ctx, struct compat_getdents_callback, ctx);
- 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 (signal_pending(current))
- return -EINTR;
- 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;
-}
-
-COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
- struct compat_linux_dirent __user *, dirent, unsigned int, count)
-{
- struct fd f;
- struct compat_linux_dirent __user * lastdirent;
- struct compat_getdents_callback buf = {
- .ctx.actor = compat_filldir,
- .current_dir = dirent,
- .count = count
- };
- int error;
-
- if (!access_ok(VERIFY_WRITE, dirent, count))
- return -EFAULT;
-
- f = fdget_pos(fd);
- if (!f.file)
- return -EBADF;
-
- error = iterate_dir(f.file, &buf.ctx);
- if (error >= 0)
- error = buf.error;
- lastdirent = buf.previous;
- if (lastdirent) {
- if (put_user(buf.ctx.pos, &lastdirent->d_off))
- error = -EFAULT;
- else
- error = count - buf.count;
- }
- fdput_pos(f);
- return error;
-}
-
-#ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64
-
-struct compat_getdents_callback64 {
- struct dir_context ctx;
- struct linux_dirent64 __user *current_dir;
- struct linux_dirent64 __user *previous;
- int count;
- int error;
-};
-
-static int compat_filldir64(struct dir_context *ctx, const char *name,
- int namlen, loff_t offset, u64 ino,
- unsigned int d_type)
-{
- struct linux_dirent64 __user *dirent;
- struct compat_getdents_callback64 *buf =
- container_of(ctx, struct compat_getdents_callback64, ctx);
- 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 (signal_pending(current))
- return -EINTR;
- 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;
-}
-
-COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
- struct linux_dirent64 __user *, dirent, unsigned int, count)
-{
- struct fd f;
- struct linux_dirent64 __user * lastdirent;
- struct compat_getdents_callback64 buf = {
- .ctx.actor = compat_filldir64,
- .current_dir = dirent,
- .count = count
- };
- int error;
-
- if (!access_ok(VERIFY_WRITE, dirent, count))
- return -EFAULT;
-
- f = fdget_pos(fd);
- if (!f.file)
- return -EBADF;
-
- error = iterate_dir(f.file, &buf.ctx);
- if (error >= 0)
- error = buf.error;
- lastdirent = buf.previous;
- if (lastdirent) {
- typeof(lastdirent->d_off) d_off = buf.ctx.pos;
- if (__put_user_unaligned(d_off, &lastdirent->d_off))
- error = -EFAULT;
- else
- error = count - buf.count;
- }
- fdput_pos(f);
- return error;
-}
-#endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */
-
-/*
- * Exactly like fs/open.c:sys_open(), except that it doesn't set the
- * O_LARGEFILE flag.
- */
-COMPAT_SYSCALL_DEFINE3(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.
- */
-COMPAT_SYSCALL_DEFINE4(openat, 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;
-}
-
-COMPAT_SYSCALL_DEFINE5(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;
-};
-
-COMPAT_SYSCALL_DEFINE1(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));
-}
-
-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(&current->saved_sigmask, &sigsaved,
- sizeof(sigsaved));
- set_restore_sigmask();
- }
- } else if (sigmask)
- sigprocmask(SIG_SETMASK, &sigsaved, NULL);
-
- return ret;
-}
-
-COMPAT_SYSCALL_DEFINE6(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);
-}
-
-COMPAT_SYSCALL_DEFINE5(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(&current->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;
-}
-
-#ifdef CONFIG_FHANDLE
-/*
- * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
- * doesn't set the O_LARGEFILE flag.
- */
-COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
- struct file_handle __user *, handle, int, flags)
-{
- return do_handle_open(mountdirfd, handle, flags);
-}
-#endif
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-07-21 18:36:44 +0200