Re: security_file_mmap locking

[sfjro]

Ben Hutchings:
> do_mmap_pgoff() /* The caller must hold down_write(&current->mm->mmap_sem) =
> */
> -> get_unmapped_area() -> security_mmap_addr()
        :::

Thanks.
And I am sorry. I was confused.
I have to correct the orders of security_mmap_addr() and ..._file() and
mmap_sem, which is
        ..._file() is called BEFORE mmap_sem
        and .._addr() is AFTER.

But the conclusion about the ..._file() call in aufs_mmap() is
unchanged. As long as ..._file() should be called out of mmap_sem,
delegating to kworker is necessary I think.

Do you have any other better approach?
Or do you think it is good to modify mm/*.c?


J. R. Okajima

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