On Jun 19, 2018, at 1:12 PM, Kees Cook [off-list ref] wrote:

quoted

On Tue, Jun 19, 2018 at 10:20 AM, Andy Lutomirski [off-list ref] wrote:

quoted

On Jun 19, 2018, at 10:07 AM, Kees Cook [off-list ref] wrote:

Does it provide anything beyond what PR_DUMPABLE does?

What do you mean?

I was just going by the name of it. I wasn't sure what "ptrace CET
lock" meant, so I was trying to understand if it was another "you
can't ptrace me" toggle, and if so, wouldn't it be redundant with
PR_SET_DUMPABLE = 0, etc.

No, other way around. The valid CET states are on/unlocked, off/unlocked, on/locked, off/locked. arch_prctl can freely the state unless locked. ptrace can change it no matter what.  The lock is to prevent the existence of a gadget to disable CET (unless the gadget involves ptrace, but I don’t think that’s a real concern).--
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