On 2024/12/03 12:08, Marc Espie wrote:
> I always forget about these when I need some instrumentation
> 
> Since the ddb knobs are already there, is there an issue to having
> more "dangerous" sysctl(8)  that need to happen before securelevel in there ?
> ...
> 
> Index: sysctl.conf
> ===================================================================
> RCS file: /build/data/openbsd/cvs/src/etc/examples/sysctl.conf,v
> diff -u -p -r1.5 sysctl.conf
> --- sysctl.conf	18 Sep 2019 08:39:06 -0000	1.5
> +++ sysctl.conf	3 Dec 2024 11:06:31 -0000
> @@ -25,6 +25,8 @@
>  #ddb.panic=0			# 0=Do not drop into ddb on a kernel panic
>  #ddb.console=1			# 1=Permit entry of ddb from the console
>  #ddb.log=1			# 1=Log ddb output in kernel message buffer
> +#kern.allowdt=1			# 1=Enable dtrace(8)
> +#kern.allowkmem=1		# 1=Enable procmap(8)
>  #fs.posix.setuid=0		# 0=Traditional BSD chown() semantics
>  #vm.swapencrypt.enable=0	# 0=Do not encrypt pages that go to swap
>  #vfs.nfs.iothreads=4		# Number of nfsio kernel threads
> 

I think allowkmem would need a more strongly-worded description.
"Allow userland access to all physical and kernel memory"?