]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - mm/maccess.c
2 * Access kernel memory without faulting.
4 #include <linux/uaccess.h>
5 #include <linux/module.h>
9 * probe_kernel_read(): safely attempt to read from a location
10 * @dst: pointer to the buffer that shall take the data
11 * @src: address to read from
12 * @size: size of the data chunk
14 * Safely read from address @src to the buffer at @dst. If a kernel fault
15 * happens, handle that and return -EFAULT.
17 long probe_kernel_read(void *dst
, void *src
, size_t size
)
22 ret
= __copy_from_user_inatomic(dst
,
23 (__force
const void __user
*)src
, size
);
26 return ret
? -EFAULT
: 0;
28 EXPORT_SYMBOL_GPL(probe_kernel_read
);
31 * probe_kernel_write(): safely attempt to write to a location
32 * @dst: address to write to
33 * @src: pointer to the data that shall be written
34 * @size: size of the data chunk
36 * Safely write to address @dst from the buffer at @src. If a kernel fault
37 * happens, handle that and return -EFAULT.
39 long probe_kernel_write(void *dst
, void *src
, size_t size
)
44 ret
= __copy_to_user_inatomic((__force
void __user
*)dst
, src
, size
);
47 return ret
? -EFAULT
: 0;
49 EXPORT_SYMBOL_GPL(probe_kernel_write
);