fix(dyninst): Fix use-after-unmap from filename-keyed DwarfHandle cache - #29
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kcossett-amd wants to merge 1 commit into
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fix(dyninst): Fix use-after-unmap from filename-keyed DwarfHandle cache#29kcossett-amd wants to merge 1 commit into
kcossett-amd wants to merge 1 commit into
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ROCm/rocm-systems#10255 (comment) |
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Pull request overview
Fixes a use-after-unmap hazard in Dyninst’s DWARF handling by preventing DwarfHandle reuse when a filename-cache hit refers to a handle built from a different Elf_X instance than the one currently being parsed.
Changes:
- Validate cached
DwarfHandleentries by comparingorigFile()against the incomingElf_X*. - Evict filename-cache entries that don’t match the current
Elf_Xto force rebuilding a fresh handle.
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sputhala-amd
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Aug 19, 2026
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Once this fix is merged, is the plan to revert ROCm/rocm-systems#10171?
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Motivation
For background on the issue being fixed, see ROCm/rocm-systems#10171
The problem is that the
DwarfHandlecache is keyed only on filename, so it hands back a handle bound to anElf_Xwhose image~Symtabalready unmapped; this verifies the binding and rebuilds the entry when it differs.Technical Details
Reuse a cached
DwarfHandleonly when itsorigFile()matches theElf_Xbeing passed in, otherwise drop the stale entry and build a new handle.Test Plan
ROCm/rocm-systems#10255 (comment)
Test Result
See Test PR on rocprofiler-systems, all tests pass.
Submission Checklist