[IA64] Failure to grow RBS (e8c59c0c) · Commits · 戴 / test

There is a bug in the ia64_do_page_fault code that can cause a failure to grow the register backing store, or any mapping that is marked as VM_GROWSUP if the mapping is the highest mapped area of memory. When the address accessed is below the first mapping the previous mapping is returned as NULL, and this case is handled. However, when the address accessed is above the highest mapping the vma returned is NULL, this case is not handled correctly, and it fails to spot that this access might require an existing mapping to grow upwards. Signed-off-by:

Andrew Burgess <andrew@transitive.com> Signed-off-by:

Tony Luck <tony.luck@intel.com>

arch/ia64/mm/fault.c

+11 −3

Original line number	Diff line number	Diff line
		@@ -112,11 +112,17 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
		down_read(&mm->mmap_sem);

		vma = find_vma_prev(mm, address, &prev_vma);
		if (!vma)
		if (!vma && !prev_vma )
		goto bad_area;

		/* find_vma_prev() returns vma such that address < vma->vm_end or NULL */
		if (address < vma->vm_start)
		/*
		* find_vma_prev() returns vma such that address < vma->vm_end or NULL
		*
		* May find no vma, but could be that the last vm area is the
		* register backing store that needs to expand upwards, in
		* this case vma will be null, but prev_vma will ne non-null
		*/
		if (( !vma && prev_vma ) \|\| (address < vma->vm_start) )
		goto check_expansion;

		good_area:
		@@ -172,6 +178,8 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re

		check_expansion:
		if (!(prev_vma && (prev_vma->vm_flags & VM_GROWSUP) && (address == prev_vma->vm_end))) {
		if (!vma)
		goto bad_area;
		if (!(vma->vm_flags & VM_GROWSDOWN))
		goto bad_area;
		if (REGION_NUMBER(address) != REGION_NUMBER(vma->vm_start)

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