next/136/60x/20230911/v1 #9472
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next/136/60x/20230911/v1 #9472
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Implement a new design for handling var name id's. The old logic was aware of detection engine versions and generally didn't work well for multi-tenancy cases. Other than memory leaks and crashes, logging of var names worked or failed based on which tenant was loaded last. This patch implements a new approach, where there is a global store of vars and their id's for the lifetime of the program. Overall Design: Base Store: "base" Used during keyword registration. Operates under lock. Base is shared between all detect engines, detect engine versions and tenants. Each variable name is ref counted. During the freeing of a detect engine / tenant, unregistration decreases the ref cnt. Base has both a string to id and a id to string hash table. String to id is used during parsing/registration. id to string during unregistration. Active Store Pointer (atomic) The "active" store atomic pointer points to the active lookup store. The call to `VarNameStoreActivate` will build a new lookup store and hot swap the pointer. Ensuring memory safety. During the hot swap, the pointer is replaced, so any new call to the lookup functions will automatically use the new store. This leaves the case of any lookup happening concurrently with the pointer swap. For this case we add the old store to a free list. It gets a timestamp before which it cannot be freed. Free List The free list contains old stores that are waiting to get removed. They contain a timestamp that is checked before they are freed. Bug: OISF#6044. Bug: OISF#6201. (cherry picked from commit b130234)
Make sure thread ctx registration happens and id remains correct in case of reloads. To do so, move id var into the detect ctx. (cherry picked from commit 2cac440)
(cherry picked from commit 269f751)
Take windows directory separators into account. Path is not checked or "resolved". (cherry picked from commit 228caa6)
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Information: QA ran without warnings. Pipeline 15886 |
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