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move point about delayed free for slab allocations

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Daniel Micay 2019-08-18 06:44:35 -04:00
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commit 0129d8e470
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@ -362,6 +362,7 @@ was a bit less important and if a core goal was finding latent bugs.
* Slab allocations are zeroed on free * Slab allocations are zeroed on free
* Detection of write-after-free for slab allocations by verifying zero filling * Detection of write-after-free for slab allocations by verifying zero filling
is intact at allocation time is intact at allocation time
* Delayed free via a combination of FIFO and randomization for slab allocations
* Large allocations are purged and memory protected on free with the memory * Large allocations are purged and memory protected on free with the memory
mapping kept reserved in a quarantine to detect use-after-free mapping kept reserved in a quarantine to detect use-after-free
* The quarantine is primarily based on a FIFO ring buffer, with the oldest * The quarantine is primarily based on a FIFO ring buffer, with the oldest
@ -372,7 +373,6 @@ was a bit less important and if a core goal was finding latent bugs.
of the quarantine of the quarantine
* Memory in fresh allocations is consistently zeroed due to it either being * Memory in fresh allocations is consistently zeroed due to it either being
fresh pages or zeroed on free after previous usage fresh pages or zeroed on free after previous usage
* Delayed free via a combination of FIFO and randomization for slab allocations
* Random canaries placed after each slab allocation to *absorb* * Random canaries placed after each slab allocation to *absorb*
and then later detect overflows/underflows and then later detect overflows/underflows
* High entropy per-slab random values * High entropy per-slab random values