On Sat, 2015-03-14 at 15:39 -0700, Davidlohr Bueso wrote:
> + if (test_and_set_mm_exe_file(mm, exefd.file))
> + return 0;
> + return -EPERM;
Bah, this is obviously bogus. We'd need the following folded in:
diff --git a/kernel/sys.c b/kernel/sys.c
index a82d0c4..41b27bd 100644
Given the introduction of the exe_file structure, this
functionality should be associated with. Because this is
a very specific prctl property, it is easily to do so. As
of now, when the file has already changed, mmap_sem is not
taken at all (however we do need it of course to check the
old mapping
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