Re: Linux-2.2.15: access_ok

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• In reply to: Thomas Sailer: "Linux-2.2.15: access_ok"
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Thomas Sailer wrote:
>
> Can anyone give me a hint why
> access_ok(VERIFY_WRITE, 0xbffff784, 2)
> fails on 2.2.15/x86 ?
>
> CONFIG_X86_WP_WORKS_OK=y

Found out. The length parameter was a 16bit
quantity, which the __range_ok macro treated
as 32bit quantity with the high half being garbage.

Alan, how about adding an explicit cast in __range_ok
like in 2.3.? That would make access_ok less fragile.

Tom

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