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SubjectRe: [PATCH?] Crash in 2.4.17/ptrace
Date
From: "Alan Cox" <alan@lxorguk.ukuu.org.uk>
> > For framebuffers addresses, there is no page structure, and then the
> > page reference count updates read/write to random memory.
>
> If it is a physical pci bus object why do we need to refcount it,
> surely "no page" is ok. Its just up to the driver not to do anything
> stupid and the core code to honour the pci/pci transfer quirks (or
> when faced with a hard one just say "no")
>
With multi-threaded apps, munmap() during O_DIRECT is possible. vma
structures don't contain a reference count.

For ptrace, taking the physical address from the PTE and ioremapping it
temporarily would work, but ...

--
Manfred


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