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Commit 0100b2ce authored by qctecmdr's avatar qctecmdr Committed by Gerrit - the friendly Code Review server
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Merge "mm: usercopy: skip stack page span check"

parents eac37ae5 dd282b25

mm/usercopy.c

+6 −0
Original line number Diff line number Diff line
@@ -164,6 +164,8 @@ static inline void check_page_span(const void *ptr, unsigned long n, 
	const void *end = ptr + n - 1;

	struct page *endpage;

	bool is_reserved, is_cma;

	const void * const stack = task_stack_page(current);

	const void * const stackend = stack + THREAD_SIZE;



	/*

	 * Sometimes the kernel data regions are not marked Reserved (see
@@ -188,6 +190,10 @@ static inline void check_page_span(const void *ptr, unsigned long n, 
	    end <= (const void *)__bss_stop)

		return;



	/* Allow stack region to span multiple pages */

	if (ptr >= stack && end <= stackend)

		return;



	/* Is the object wholly within one base page? */

	if (likely(((unsigned long)ptr & (unsigned long)PAGE_MASK) ==

		   ((unsigned long)end & (unsigned long)PAGE_MASK)))