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authorJann Horn <jannh@google.com>2017-11-14 01:03:44 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-15 13:12:08 -0800
commit373c4557d2aa362702c4c2d41288fb1e54990b7c (patch)
tree4dd47b260e9210d3da7bb3408d70a459f9467a59 /include/uapi
parent5bbcc0f595fadb4cac0eddc4401035ec0bd95b09 (diff)
downloadlinux-next-373c4557d2aa362702c4c2d41288fb1e54990b7c.tar.gz
mm/pagewalk.c: report holes in hugetlb ranges
This matters at least for the mincore syscall, which will otherwise copy uninitialized memory from the page allocator to userspace. It is probably also a correctness error for /proc/$pid/pagemap, but I haven't tested that. Removing the `walk->hugetlb_entry` condition in walk_hugetlb_range() has no effect because the caller already checks for that. This only reports holes in hugetlb ranges to callers who have specified a hugetlb_entry callback. This issue was found using an AFL-based fuzzer. v2: - don't crash on ->pte_hole==NULL (Andrew Morton) - add Cc stable (Andrew Morton) Fixes: 1e25a271c8ac ("mincore: apply page table walker on do_mincore()") Signed-off-by: Jann Horn <jannh@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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