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authorIngo Molnar <mingo@elte.hu>2008-04-17 22:05:36 +0400
committerIngo Molnar <mingo@elte.hu>2008-04-17 22:05:36 +0400
commitc33fa9f5609e918824446ef9a75319d4a802f1f4 (patch)
treeab711865ba14d4e3d21c2e480e8b113fc73e08a2 /include/linux/uaccess.h
parent4b119e21d0c66c22e8ca03df05d9de623d0eb50f (diff)
downloadlinux-c33fa9f5609e918824446ef9a75319d4a802f1f4.tar.xz
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.h22
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__ */