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Use proper resource identifers for table validation and dump state structs #2550
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jphickey
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Use a resourceID value for access into the validation result structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
jphickey
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Use a resourceID value for access into the dump control structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
jphickey
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Use a resourceID value for access into the validation result structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
jphickey
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Use a resourceID value for access into the dump control structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
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jphickey
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Use a resourceID value for access into the validation result structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
jphickey
added a commit
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Apr 19, 2024
Use a resourceID value for access into the dump control structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
jphickey
added a commit
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Apr 19, 2024
Use a resourceID value for access into the validation result structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
jphickey
added a commit
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Apr 19, 2024
Use a resourceID value for access into the dump control structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
jphickey
added a commit
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Apr 19, 2024
Use a resourceID value for access into the validation result structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
jphickey
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Use a resourceID value for access into the dump control structure array. This allows for consistent lookup, matching, and free/in-use determination, as well as improved resilience to race conditions and stale data.
dzbaker
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May 2, 2024
Fix #2550, use resourceids for internal table validation and dump control blocks
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Is your feature request related to a problem? Please describe.
Internally, table services keeps the state of a validation request and dump request in a separate structure under its global data. This is then referenced by index from the other areas (such as registry, etc).
This presents a possible race condition/stale data problem when indices are reused (they are treated as a ring buffer). That is, a reference to index "0" cannot be distinguished from a currently-valid index 0 or a previous reference that has since been closed and reopened for a different purpose.
Describe the solution you'd like
Use Resource IDs. These have two major benefits to the robustness of the code:
memset
to 0 sets it to a safe state automatically).Describe alternatives you've considered
N/A
Additional context
Gradually all table services indices should be converted to use resource IDs. However, changing the table handle will change the API, so that isn't being proposed yet.
These two items (validation and dump state) are rather simple and low-risk to change, as they aren't referenced in nearly as many places as the registry or handle/access descriptor table.
Requester Info
Joseph Hickey, Vantage Systems, Inc.
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