https://github.com/torvalds/linux
Revision 46d0b24c5ee10a15dfb25e20642f5a5ed59c5003 authored by Oleg Nesterov on 25 August 2019, 00:54:56 UTC, committed by Linus Torvalds on 25 August 2019, 02:48:42 UTC
userfaultfd_release() should clear vm_flags/vm_userfaultfd_ctx even if
mm->core_state != NULL.

Otherwise a page fault can see userfaultfd_missing() == T and use an
already freed userfaultfd_ctx.

Link: http://lkml.kernel.org/r/20190820160237.GB4983@redhat.com
Fixes: 04f5866e41fb ("coredump: fix race condition between mmget_not_zero()/get_task_mm() and core dumping")
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 7b2b55d
History
Tip revision: 46d0b24c5ee10a15dfb25e20642f5a5ed59c5003 authored by Oleg Nesterov on 25 August 2019, 00:54:56 UTC
userfaultfd_release: always remove uffd flags and clear vm_userfaultfd_ctx
Tip revision: 46d0b24
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