[ubuntu-hardened] [kernel-hardening] Re: Add overflow protection to kref
pageexec at freemail.hu
Fri Feb 24 22:14:43 UTC 2012
On 24 Feb 2012 at 14:04, David Windsor wrote:
> Suggestions on recovering from an overflow here?
do what PaX does? :)
1. saturate the refcount
2. report the event (pax_report_refcount_overflow)
3. kill the triggering userland process (this may be optional but it's a good measure
if you have stuff like grsecurity's lockout feature)
> 2. Detect the overflow before it happens, don't increment the counter,
> issue a warning but no BUG.
> This could also lead to some "undefined" behavior in subsystems.
it's called a memory leak :).
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