Messages in this thread | | | Subject | Re: [PATCH] powerpc vdso updates | From | Benjamin Herrenschmidt <> | Date | Tue, 30 May 2006 17:21:40 +1000 |
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> get_unmapped_area() without holding the mmap semaphore seems dangerous. > The VDSO setup itself should be 'private' to the process, but i'm not > totally sure that no other kernel code could get access to this mm. For > example the swapout code? Am i missing something?
Well, all of this happens so early, I doubt anything will cause actual harm, for get_unmapped_area to be a problem, something would have to concurrently allocate a VMA (or dispose of) I think that can't happen at this point before we even run the binary but yes, better safe than sorry... I supose the whole patch could get in 2.6.17 even without the arch_vma_name (that is it can be there, it wont be used though until your patch gets in).
Ben.
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