[PATCH 0/7] Rework perf and ptrace watchpoint tracking

[Michael Ellerman]

On Tue, 01 Aug 2023 11:17:37 +1000, Benjamin Gray wrote:
> Syzkaller triggered a null pointer dereference in the
> arch_unregister_hw_breakpoint() hook. This is due to accessing
> the bp->ctx->task field changing to -1 while we iterate the breakpoints.
> 
> This series refactors the breakpoint tracking logic to remove the
> dependency on bp->ctx entirely. It also simplifies handling of ptrace and
> perf breakpoints, making insertion less restrictive.
> 
> [...]

Applied to powerpc/next.

[1/7] powerpc/watchpoints: Explain thread_change_pc() more
      https://git.kernel.org/powerpc/c/8f8f1cd67aa026c9dab8eb4e087e4a2d8fa9d5bc
[2/7] powerpc/watchpoints: Don't track info persistently
      https://git.kernel.org/powerpc/c/668a6ec6ed57f0248070c490aba75a9572e4b0a4
[3/7] powerpc/watchpoints: Track perf single step directly on the breakpoint
      https://git.kernel.org/powerpc/c/1e60f3564bad09962646bf8c2af588ecf518d337
[4/7] powerpc/watchpoints: Simplify watchpoint reinsertion
      https://git.kernel.org/powerpc/c/5a2d8b9c06712b52b2f0f2fc9a144242277fda74
[5/7] powerpc/watchpoints: Remove ptrace/perf exclusion tracking
      https://git.kernel.org/powerpc/c/bd29813ae10698f7bdfb3c68eacbb6464ec701ff
[6/7] selftests/powerpc/ptrace: Update ptrace-perf watchpoint selftest
      https://git.kernel.org/powerpc/c/58709f6fc327a997daeeca77aa5e6bd4d4c238cf
[7/7] perf/hw_breakpoint: Remove arch breakpoint hooks
      https://git.kernel.org/powerpc/c/53834a0c09252dea7918a9e1788bad880690900b

cheers