On 1/17/20 11:16 AM, Catalin Marinas wrote:

On Mon, Dec 16, 2019 at 02:17:15PM +0530, Amit Daniel Kachhap wrote:

quoted

This patch disables the probing of authenticate ptrauth
instruction which falls under the hint instructions region.
This is done to disallow probe of instruction which may lead
to ptrauth faults.

The corresponding append pac ptrauth instruction is not
disabled as they are typically the first instruction in the
function so disabling them will be disabling the function
probe itself. Also, appending pac do not cause any exception
in itself.

Neither does AUTIASP in v8.3, only the subsequent dereferencing, so why
can kprobes cope with PACIASP but not AUTIASP?

ok I will add this patch as part of FPAC in armv8.6 ptrauth.

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