Re: [Patch v5 11/16] x86/speculation: Add Spectre v2 app to app protection modes

[Thomas Gleixner]

On Sun, 18 Nov 2018, Jiri Kosina wrote:
> On Sat, 17 Nov 2018, Jiri Kosina wrote:

> Subject: [PATCH] x86/speculation: enforce STIBP for SECCOMP tasks in lite mode
> 
> If 'lite' mode of app2app protection from spectre_v2 is selected on
> kernel command-line, we are currently applying STIBP protection to
> non-dumpable tasks, and tasks that have explicitly requested such
> protection via
> 
> 	prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_INDIR_BRANCH, PR_SPEC_ENABLE, 0, 0);
> 
> Let's extend this to cover also SECCOMP tasks (analogically to how we
> apply SSBD protection).

Right. And SSBD does not fiddle with dumpable.

Willy had concerns about the (ab)use of dumpable so I'm holding off on that
bit for now.

Thanks,

	tglx