On Thu, Feb 02, 2023 at 10:56:29AM -0800, John Stultz wrote: > That said, making sense of the error message isn't completely trivial > either. I've been seeing a few cases recently of some of the new > compiler tooling (I pinged you earlier on a CFI one) causing errors > that developers aren't really sure how to address. I know sometimes > it's not easy to surface the errors with context to what was wrong, > but at the risk of intense bike shedding, is there some way to provide > something like "Likely array bounds error" instead of just "BRK > handler: Fatal exception"? Yeah, this is a result of the size trade-off that resulted in config CONFIG_UBSAN_TRAP -- there ends up being no message about what went wrong. I'd really like to have cleaner handling of this -- perhaps what was done for KCFI could be applied to UBSAN as well, though this is an area I don't know well myself. (i.e. encoding "this was a UBSAN trap" in the trap itself.) Sami or Ard, is this something that could be improved for arm64? -- Kees Cook
