https://github.com/torvalds/linux
Revision e2a50c1f64145a04959df2442305d57307e5395a authored by Andrea Arcangeli on 30 November 2018, 22:09:37 UTC, committed by Linus Torvalds on 30 November 2018, 22:56:14 UTC
With MAP_SHARED: recheck the i_size after taking the PT lock, to serialize against truncate with the PT lock. Delete the page from the pagecache if the i_size_read check fails. With MAP_PRIVATE: check the i_size after the PT lock before mapping anonymous memory or zeropages into the MAP_PRIVATE shmem mapping. A mostly irrelevant cleanup: like we do the delete_from_page_cache() pagecache removal after dropping the PT lock, the PT lock is a spinlock so drop it before the sleepable page lock. Link: http://lkml.kernel.org/r/20181126173452.26955-5-aarcange@redhat.com Fixes: 4c27fe4c4c84 ("userfaultfd: shmem: add shmem_mcopy_atomic_pte for userfaultfd support") Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: Hugh Dickins <hughd@google.com> Reported-by: Jann Horn <jannh@google.com> Cc: <stable@vger.kernel.org> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Peter Xu <peterx@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tip revision: e2a50c1f64145a04959df2442305d57307e5395a authored by Andrea Arcangeli on 30 November 2018, 22:09:37 UTC
userfaultfd: shmem: add i_size checks
userfaultfd: shmem: add i_size checks
Tip revision: e2a50c1
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Kconfig | -rw-r--r-- | 3.5 KB |
Makefile | -rw-r--r-- | 5.2 KB |
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