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[PATCH] add probe_kernel_address()
Add a version of __get_user() which is safe to call inside mmap_sem. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -19,4 +19,26 @@ static inline unsigned long __copy_from_user_nocache(void *to,
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#endif /* ARCH_HAS_NOCACHE_UACCESS */
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/**
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* probe_kernel_address(): safely attempt to read from a location
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* @addr: address to read from - its type is type typeof(retval)*
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* @retval: read into this variable
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*
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* Safely read from address @addr into variable @revtal. If a kernel fault
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* happens, handle that and return -EFAULT.
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* We ensure that the __get_user() is executed in atomic context so that
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* do_page_fault() doesn't attempt to take mmap_sem. This makes
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* probe_kernel_address() suitable for use within regions where the caller
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* already holds mmap_sem, or other locks which nest inside mmap_sem.
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*/
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#define probe_kernel_address(addr, retval) \
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({ \
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long ret; \
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\
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inc_preempt_count(); \
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ret = __get_user(retval, addr); \
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dec_preempt_count(); \
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ret; \
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})
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#endif /* __LINUX_UACCESS_H__ */
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