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Factor checks under separate feature flags. (#587)

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All the checks and mitigations have been placed under feature flags.
These can be controlled by defining

  SNMALLOC_CHECK_CLIENT_MITIGATIONS

This can take a term that represents the mitigations that should be enabled.
E.g.
  -DSNMALLOC_CHECK_CLIENT_MITIGATIONS=nochecks+random_pagemap

The CMake uses this to build numerous versions of the LD_PRELOAD library and
tests to allow individual features to be benchmarked.

Co-authored-by: Nathaniel Wesley Filardo <nfilardo@microsoft.com>
This commit is contained in:
Matthew Parkinson
2023-03-23 13:41:02 +00:00
committed by GitHub
parent 848db74cfc
commit ccca98a709
25 changed files with 753 additions and 435 deletions
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docs/PORTING.md
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@@ -30,7 +30,7 @@ If memory is not required any more, then `snmalloc` will change the state to
`not using`, and will ensure that it notifies the `Pal` again
before it every accesses that memory again.
The `not using` state allows the `Pal` to recycle the memory for other purposes.
If `PalEnforceAccess` is set to true, then accessing that has not been notified
If `pal_enforce_access` is set as a mitigation, then accessing memory that has not been notified
correctly should trigger an exception/segfault.
The state for a particular region of memory is set with