W-M-R opened a new pull request, #21359:
URL: https://github.com/apache/nuttx/pull/21359
## Summary
`allsyms.tmp` and `kasan_globals.tmp` are generated arrays with no
compile-time bounds. When built with `-fsanitize=kernel-address`, every
access is checked against a shadow entry that does not exist for dynamically
linked arrays, which produces false positives and, for `kasan_globals.tmp`,
an empty array.
Add `-fno-sanitize=kernel-address` to both generated objects, in the Makefile
paths (`arch/{arm,arm64,risc-v,sim,x86}/src/Makefile`) and via
`set_source_files_properties()` in the CMake path.
## Impact
- Build-system only; `CONFIG_ALLSYMS` / `CONFIG_MM_KASAN_GLOBAL`
configurations build again.
- No runtime change when those options are disabled.
## Testing
Host: Ubuntu 22.04, qemu-system-aarch64 8.2.
Build `qemu-armv8a:sw_tags` with `CONFIG_ALLSYMS=y` and
`CONFIG_MM_KASAN_GLOBAL=y`, then boot it and run `kasantest`.
Before: the generated `allsyms.tmp` / `kasan_globals.tmp` objects are
instrumented and access to them is reported as out-of-bounds (or the array
comes out empty). After: the image builds, boots, and `kasantest` passes.
Also built `sim:kasan` and the `arm`/`risc-v`/`x86` defconfigs with ALLSYMS
enabled to cover the other Makefiles.
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