On Mon, Feb 26, 2024 at 02:37:29PM -0800, Doug Anderson wrote:

Hi,

On Mon, Feb 26, 2024 at 2:33 PM Adrian Ratiu [off-list ref] wrote:

quoted

quoted

quoted

[...]
+config SECURITY_PROC_MEM_RESTRICT_WRITES

Instead of a build-time CONFIG, I'd prefer a boot-time config (or a
sysctl, but that's be harder given the perms). That this is selectable
by distro users, etc, and they don't need to rebuild their kernel to
benefit from it.

Ack, I'll implement a cmdline arg in v2.

Any objections to doing both? Have a CONFIG option for a default and a
cmdline to override it? This way if a distro wants to restrict writes
by default then don't need to jam more stuff into the kernel command
line.

For an example, take a look at randomize_kstack_offset and
CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT.

-- 
Kees Cook