Re: [PATCH v4 32/39] x86: Expose thread features in /proc/$PID/status
From: Kees Cook <hidden>
Date: 2022-12-03 02:53:10
Also in:
linux-arch, linux-doc, linux-mm, lkml
On Fri, Dec 02, 2022 at 04:35:59PM -0800, Rick Edgecombe wrote:
Applications and loaders can have logic to decide whether to enable shadow stack. They usually don't report whether shadow stack has been enabled or not, so there is no way to verify whether an application actually is protected by shadow stack. Add two lines in /proc/$PID/status to report enabled and locked features. Since, this involves referring to arch specific defines in asm/prctl.h, implement an arch breakout to emit the feature lines. Tested-by: Pengfei Xu <redacted> Tested-by: John Allen <john.allen@amd.com> Signed-off-by: Kirill A. Shutemov <redacted>
Reviewed-by: Kees Cook <redacted> -- Kees Cook