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authorSuren Baghdasaryan <surenb@google.com>2024-01-12 04:39:35 +0300
committerAndrew Morton <akpm@linux-foundation.org>2024-01-13 02:20:49 +0300
commit5d4747a6cc8e78ce74742d557fc9b7697fcacc95 (patch)
tree8e459befcdcd7ff84cdb2e7a582198a46182ff12 /MAINTAINERS
parentaa8f91910bf5fb11dcd176e6efac2dbe2cecebea (diff)
downloadlinux-5d4747a6cc8e78ce74742d557fc9b7697fcacc95.tar.xz
userfaultfd: avoid huge_zero_page in UFFDIO_MOVE
While testing UFFDIO_MOVE ioctl, syzbot triggered VM_BUG_ON_PAGE caused by a call to PageAnonExclusive() with a huge_zero_page as a parameter. UFFDIO_MOVE does not yet handle zeropages and returns EBUSY when one is encountered. Add an early huge_zero_page check in the PMD move path to avoid this situation. Link: https://lkml.kernel.org/r/20240112013935.1474648-1-surenb@google.com Fixes: adef440691ba ("userfaultfd: UFFDIO_MOVE uABI") Reported-by: syzbot+705209281e36404998f6@syzkaller.appspotmail.com Signed-off-by: Suren Baghdasaryan <surenb@google.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Peter Xu <peterx@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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