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.
18 long __weak
probe_kernel_read(void *dst
, void *src
, size_t size
)
19 __attribute__((alias("__probe_kernel_read")));
21 long __probe_kernel_read(void *dst
, void *src
, size_t size
)
24 mm_segment_t old_fs
= get_fs();
28 ret
= __copy_from_user_inatomic(dst
,
29 (__force
const void __user
*)src
, size
);
33 return ret
? -EFAULT
: 0;
35 EXPORT_SYMBOL_GPL(probe_kernel_read
);
38 * probe_kernel_write(): safely attempt to write to a location
39 * @dst: address to write to
40 * @src: pointer to the data that shall be written
41 * @size: size of the data chunk
43 * Safely write to address @dst from the buffer at @src. If a kernel fault
44 * happens, handle that and return -EFAULT.
46 long __weak
probe_kernel_write(void *dst
, void *src
, size_t size
)
47 __attribute__((alias("__probe_kernel_write")));
49 long __probe_kernel_write(void *dst
, void *src
, size_t size
)
52 mm_segment_t old_fs
= get_fs();
56 ret
= __copy_to_user_inatomic((__force
void __user
*)dst
, src
, size
);
60 return ret
? -EFAULT
: 0;
62 EXPORT_SYMBOL_GPL(probe_kernel_write
);
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