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author | Ingo Molnar <mingo@elte.hu> | 2008-04-17 20:05:36 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-04-17 20:05:36 +0200 |
commit | c33fa9f5609e918824446ef9a75319d4a802f1f4 (patch) | |
tree | ab711865ba14d4e3d21c2e480e8b113fc73e08a2 /include/linux/uaccess.h | |
parent | 4b119e21d0c66c22e8ca03df05d9de623d0eb50f (diff) | |
download | blackbird-op-linux-c33fa9f5609e918824446ef9a75319d4a802f1f4.tar.gz blackbird-op-linux-c33fa9f5609e918824446ef9a75319d4a802f1f4.zip |
uaccess: add probe_kernel_write()
add probe_kernel_read() and probe_kernel_write().
Uninlined and restricted to kernel range memory only, as suggested
by Linus.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/uaccess.h')
-rw-r--r-- | include/linux/uaccess.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 975c963e5789..fec6decfb983 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -84,4 +84,26 @@ static inline unsigned long __copy_from_user_nocache(void *to, ret; \ }) +/* + * probe_kernel_read(): safely attempt to read from a location + * @dst: pointer to the buffer that shall take the data + * @src: address to read from + * @size: size of the data chunk + * + * Safely read from address @src to the buffer at @dst. If a kernel fault + * happens, handle that and return -EFAULT. + */ +extern long probe_kernel_read(void *dst, void *src, size_t size); + +/* + * probe_kernel_write(): safely attempt to write to a location + * @dst: address to write to + * @src: pointer to the data that shall be written + * @size: size of the data chunk + * + * Safely write to address @dst from the buffer at @src. If a kernel fault + * happens, handle that and return -EFAULT. + */ +extern long probe_kernel_write(void *dst, void *src, size_t size); + #endif /* __LINUX_UACCESS_H__ */ |