| Date | Fri, 19 Mar 2021 11:45:38 -0700 | From | Kees Cook <> | Subject | Re: [PATCH v30 04/12] landlock: Add ptrace restrictions |
| |
On Tue, Mar 16, 2021 at 09:42:44PM +0100, Mickaël Salaün wrote: > From: Mickaël Salaün <mic@linux.microsoft.com> > > Using ptrace(2) and related debug features on a target process can lead > to a privilege escalation. Indeed, ptrace(2) can be used by an attacker > to impersonate another task and to remain undetected while performing > malicious activities. Thanks to ptrace_may_access(), various part of > the kernel can check if a tracer is more privileged than a tracee. > > A landlocked process has fewer privileges than a non-landlocked process > and must then be subject to additional restrictions when manipulating > processes. To be allowed to use ptrace(2) and related syscalls on a > target process, a landlocked process must have a subset of the target > process's rules (i.e. the tracee must be in a sub-domain of the tracer). > > Cc: James Morris <jmorris@namei.org> > Cc: Kees Cook <keescook@chromium.org> > Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
-- Kees Cook
|