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Merge branch 'work.__copy_in_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull __copy_in_user removal from Al Viro:
 "There used to be 6 places in the entire tree calling __copy_in_user(),
  all of them bogus.

  Four got killed off in work.drm branch, this takes care of the
  remaining ones and kills the definition of that sucker"

* 'work.__copy_in_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  kill __copy_in_user()
  sanitize do_i2c_smbus_ioctl()
This commit is contained in:
Linus Torvalds 2017-07-08 10:15:02 -07:00
commit 46ace66b3b
2 changed files with 9 additions and 16 deletions
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19
fs/compat_ioctl.c
View file

@ -739,23 +739,22 @@ static int do_i2c_smbus_ioctl(struct file *file,
unsigned int cmd, struct i2c_smbus_ioctl_data32 __user *udata)
{
struct i2c_smbus_ioctl_data __user *tdata;
compat_caddr_t datap;
union {
/* beginnings of those have identical layouts */
struct i2c_smbus_ioctl_data32 data32;
struct i2c_smbus_ioctl_data data;
} v;
tdata = compat_alloc_user_space(sizeof(*tdata));
if (tdata == NULL)
return -ENOMEM;
if (!access_ok(VERIFY_WRITE, tdata, sizeof(*tdata)))
return -EFAULT;
if (!access_ok(VERIFY_READ, udata, sizeof(*udata)))
memset(&v, 0, sizeof(v));
if (copy_from_user(&v.data32, udata, sizeof(v.data32)))
return -EFAULT;
v.data.data = compat_ptr(v.data32.data);
if (__copy_in_user(&tdata->read_write, &udata->read_write, 2 * sizeof(u8)))
return -EFAULT;
if (__copy_in_user(&tdata->size, &udata->size, 2 * sizeof(u32)))
return -EFAULT;
if (__get_user(datap, &udata->data) ||
__put_user(compat_ptr(datap), &tdata->data))
if (copy_to_user(tdata, &v.data, sizeof(v.data)))
return -EFAULT;
return do_ioctl(file, cmd, (unsigned long)tdata);

6
include/linux/uaccess.h
View file

@ -156,12 +156,6 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
}
#ifdef CONFIG_COMPAT
static __always_inline unsigned long __must_check
__copy_in_user(void __user *to, const void *from, unsigned long n)
{
might_fault();
return raw_copy_in_user(to, from, n);
}
static __always_inline unsigned long __must_check
copy_in_user(void __user *to, const void *from, unsigned long n)
{
might_fault();