mm: fix use-after-free if memory allocation failed in vma_adjust() (734537c9) · Commits · 戴 / test

There's one case when vma_adjust() expands the vma, overlapping with *two* next vma. See case 6 of mprotect, described in the comment to vma_merge(). To handle this (and only this) situation we iterate twice over main part of the function. See "goto again". Vegard reported[1] that he sees out-of-bounds access complain from KASAN, if anon_vma_clone() on the *second* iteration fails. This happens because we free 'next' vma by the end of first iteration and don't have a way to undo this if anon_vma_clone() fails on the second iteration. The solution is to do all required allocations upfront, before we touch vmas. The allocation on the second iteration is only required if first two vmas don't have anon_vma, but third does. So we need, in total, one anon_vma_clone() call. It's easy to adjust 'exporter' to the third vma for such case. [1] http://lkml.kernel.org/r/1469514843-23778-1-git-send-email-vegard.nossum@oracle.com Link: http://lkml.kernel.org/r/1469625255-126641-1-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by:

Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by:

Vegard Nossum <vegard.nossum@oracle.com> Cc: Rik van Riel <riel@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

mm/mmap.c

+15 −5

Original line number	Diff line number	Diff line
		@@ -621,7 +621,6 @@ int vma_adjust(struct vm_area_struct *vma, unsigned long start,
		{
		struct mm_struct *mm = vma->vm_mm;
		struct vm_area_struct *next = vma->vm_next;
		struct vm_area_struct *importer = NULL;
		struct address_space *mapping = NULL;
		struct rb_root *root = NULL;
		struct anon_vma *anon_vma = NULL;
		@@ -631,17 +630,25 @@ int vma_adjust(struct vm_area_struct *vma, unsigned long start,
		int remove_next = 0;

		if (next && !insert) {
		struct vm_area_struct *exporter = NULL;
		struct vm_area_struct exporter = NULL, importer = NULL;

		if (end >= next->vm_end) {
		/*
		* vma expands, overlapping all the next, and
		* perhaps the one after too (mprotect case 6).
		*/
		again: remove_next = 1 + (end > next->vm_end);
		remove_next = 1 + (end > next->vm_end);
		end = next->vm_end;
		exporter = next;
		importer = vma;

		/*
		* If next doesn't have anon_vma, import from vma after
		* next, if the vma overlaps with it.
		*/
		if (remove_next == 2 && next && !next->anon_vma)
		exporter = next->vm_next;

		} else if (end > next->vm_start) {
		/*
		* vma expands, overlapping part of the next:
		@@ -675,7 +682,7 @@ again: remove_next = 1 + (end > next->vm_end);
		return error;
		}
		}

		again:
		vma_adjust_trans_huge(vma, start, end, adjust_next);

		if (file) {
		@@ -796,8 +803,11 @@ again: remove_next = 1 + (end > next->vm_end);
		* up the code too much to do both in one go.
		*/
		next = vma->vm_next;
		if (remove_next == 2)
		if (remove_next == 2) {
		remove_next = 1;
		end = next->vm_end;
		goto again;
		}
		else if (next)
		vma_gap_update(next);
		else

Admin message