Messages in this thread |  | | Date | Thu, 4 Jan 2001 02:51:53 +0100 | From | Andi Kleen <> | Subject | Re: [RFC] prevention of syscalls from writable segments, breaking bug exploits |
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On Wed, Jan 03, 2001 at 04:54:38PM -0500, Alexander Viro wrote: > > Win: 0 > Loss: cost of find_vma() (and down(&mm->mmap_sem), BTW) on every system
It could actually be optimized a lot, e.g. by just read/writing to a byte in the caller's current code page and handling the exception.
But I agree with you that it's rather useless. It'll break some existing exploits, but it's so easy to workaround that exploit writers would quickly adapt and then you have a ugly check with no purpose after a few weeks.
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