ecryptfs: forbid opening files without mmap handler
This prevents users from triggering a stack overflow through a recursive invocation of pagefault handling that involves mapping procfs files into virtual memory. Signed-off-by: NJann Horn <jannh@google.com> Acked-by: NTyler Hicks <tyhicks@canonical.com> Cc: stable@vger.kernel.org Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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