diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-04-17 14:05:36 -0400 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-04-17 14:05:36 -0400 |
commit | c33fa9f5609e918824446ef9a75319d4a802f1f4 (patch) | |
tree | ab711865ba14d4e3d21c2e480e8b113fc73e08a2 /include/linux | |
parent | 4b119e21d0c66c22e8ca03df05d9de623d0eb50f (diff) |
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')
-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, | |||
84 | ret; \ | 84 | ret; \ |
85 | }) | 85 | }) |
86 | 86 | ||
87 | /* | ||
88 | * probe_kernel_read(): safely attempt to read from a location | ||
89 | * @dst: pointer to the buffer that shall take the data | ||
90 | * @src: address to read from | ||
91 | * @size: size of the data chunk | ||
92 | * | ||
93 | * Safely read from address @src to the buffer at @dst. If a kernel fault | ||
94 | * happens, handle that and return -EFAULT. | ||
95 | */ | ||
96 | extern long probe_kernel_read(void *dst, void *src, size_t size); | ||
97 | |||
98 | /* | ||
99 | * probe_kernel_write(): safely attempt to write to a location | ||
100 | * @dst: address to write to | ||
101 | * @src: pointer to the data that shall be written | ||
102 | * @size: size of the data chunk | ||
103 | * | ||
104 | * Safely write to address @dst from the buffer at @src. If a kernel fault | ||
105 | * happens, handle that and return -EFAULT. | ||
106 | */ | ||
107 | extern long probe_kernel_write(void *dst, void *src, size_t size); | ||
108 | |||
87 | #endif /* __LINUX_UACCESS_H__ */ | 109 | #endif /* __LINUX_UACCESS_H__ */ |