try_grab_compound_head() is used to grab a reference to a page from get_user_pages_fast(), which is only protected against concurrent freeing of page tables (via local_irq_save()), but not against concurrent TLB flushes, freeing of data pages, or splitting of compound pages.

Because no reference is held to the page when try_grab_compound_head() is called, the page may have been freed and reallocated by the time its refcount has been elevated; therefore, once we're holding a stable reference to the page, the caller re-checks whether the PTE still points to the same page (with the same access rights).

The problem is that try_grab_compound_head() has to grab a reference on the head page; but between the time we look up what the head page is and the time we actually grab a reference on the head page, the compound page may have been split up (either explicitly through split_huge_page() or by freeing the compound page to the buddy allocator and then allocating its individual order-0 pages). If that happens, get_user_pages_fast() may end up returning the right page but lifting the refcount on a now-unrelated page, leading to use-after-free of pages.

To fix it: Re-check whether the pages still belong together after lifting the refcount on the head page. Move anything else that checks compound_head(page) below the refcount increment.

This can't actually happen on bare-metal x86 (because there, disabling IRQs locks out remote TLB flushes), but it can happen on virtualized x86 (e.g. under KVM) and probably also on arm64. The race window is pretty narrow, and constantly allocating and shattering hugepages isn't exactly fast; for now I've only managed to reproduce this in an x86 KVM guest with an artificially widened timing window (by adding a loop that repeatedly calls `inl(0x3f8 + 5)` in `try_get_compound_head()` to force VM exits, so that PV TLB flushes are used instead of IPIs).

Cc: Matthew Wilcox willy@infradead.org Cc: Kirill A. Shutemov kirill@shutemov.name Cc: John Hubbard jhubbard@nvidia.com Cc: Jan Kara jack@suse.cz Cc: stable@vger.kernel.org Fixes: 7aef4172c795 ("mm: handle PTE-mapped tail pages in gerneric fast gup implementaiton") Signed-off-by: Jann Horn jannh@google.com --- resending because linux-mm was down

mm/gup.c | 54 +++++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 39 insertions(+), 15 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c index 3ded6a5f26b2..1f9c0ac15073 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -43,8 +43,21 @@ static void hpage_pincount_sub(struct page *page, int refs)

atomic_sub(refs, compound_pincount_ptr(page)); }

+/* Equivalent to calling put_page() @refs times. */ +static void put_page_refs(struct page *page, int refs) +{ + VM_BUG_ON_PAGE(page_ref_count(page) < refs, page); + /* + * Calling put_page() for each ref is unnecessarily slow. Only the last + * ref needs a put_page(). + */ + if (refs > 1) + page_ref_sub(page, refs - 1); + put_page(page); +} + /* * Return the compound head page with ref appropriately incremented, * or NULL if that failed. */ @@ -55,8 +68,23 @@ static inline struct page *try_get_compound_head(struct page *page, int refs) if (WARN_ON_ONCE(page_ref_count(head) < 0)) return NULL; if (unlikely(!page_cache_add_speculative(head, refs))) return NULL; + + /* + * At this point we have a stable reference to the head page; but it + * could be that between the compound_head() lookup and the refcount + * increment, the compound page was split, in which case we'd end up + * holding a reference on a page that has nothing to do with the page + * we were given anymore. + * So now that the head page is stable, recheck that the pages still + * belong together. + */ + if (unlikely(compound_head(page) != head)) { + put_page_refs(head, refs); + return NULL; + } + return head; }

/* @@ -94,25 +122,28 @@ __maybe_unused struct page *try_grab_compound_head(struct page *page, if (unlikely((flags & FOLL_LONGTERM) && !is_pinnable_page(page))) return NULL;

+ /* + * CAUTION: Don't use compound_head() on the page before this + * point, the result won't be stable. + */ + page = try_get_compound_head(page, refs); + if (!page) + return NULL; + /* * When pinning a compound page of order > 1 (which is what * hpage_pincount_available() checks for), use an exact count to * track it, via hpage_pincount_add/_sub(). * * However, be sure to *also* increment the normal page refcount * field at least once, so that the page really is pinned. */ - if (!hpage_pincount_available(page)) - refs *= GUP_PIN_COUNTING_BIAS; - - page = try_get_compound_head(page, refs); - if (!page) - return NULL; - if (hpage_pincount_available(page)) hpage_pincount_add(page, refs); + else + page_ref_add(page, refs * (GUP_PIN_COUNTING_BIAS - 1));

mod_node_page_state(page_pgdat(page), NR_FOLL_PIN_ACQUIRED, orig_refs);

@@ -134,16 +165,9 @@ static void put_compound_head(struct page *page, int refs, unsigned int flags) else refs *= GUP_PIN_COUNTING_BIAS; }

- VM_BUG_ON_PAGE(page_ref_count(page) < refs, page); - /* - * Calling put_page() for each ref is unnecessarily slow. Only the last - * ref needs a put_page(). - */ - if (refs > 1) - page_ref_sub(page, refs - 1); - put_page(page); + put_page_refs(page, refs); }

/** * try_grab_page() - elevate a page's refcount by a flag-dependent amount

base-commit: 614124bea77e452aa6df7a8714e8bc820b489922