Re: [PATCH v2 2/2] Documentation/vmcoreinfo: Add documentation for 'KERNELPACMASK'

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Hi,

On 5/4/20 11:04 PM, Will Deacon wrote:
On Mon, Apr 27, 2020 at 11:55:02AM +0530, Amit Daniel Kachhap wrote:
Add documentation for KERNELPACMASK variable being added to the vmcoreinfo.

It indicates the PAC bits mask information of signed kernel pointers if
Armv8.3-A Pointer Authentication feature is present.

Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@xxxxxxx>
---
  Documentation/admin-guide/kdump/vmcoreinfo.rst | 6 ++++++
  1 file changed, 6 insertions(+)

diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst b/Documentation/admin-guide/kdump/vmcoreinfo.rst
index 007a6b8..5cc3ee6 100644
--- a/Documentation/admin-guide/kdump/vmcoreinfo.rst
+++ b/Documentation/admin-guide/kdump/vmcoreinfo.rst
@@ -393,6 +393,12 @@ KERNELOFFSET
  The kernel randomization offset. Used to compute the page offset. If
  KASLR is disabled, this value is zero.
+KERNELPACMASK
+-------------
+
+Indicates the PAC bits mask information if Pointer Authentication is
+enabled and address authentication feature is present.

This is a bit cryptic. How about:

   The mask to extract the Pointer Authentication Code from a kernel virtual
   address.

Ok sure. I will update like this in the v3 version.

Cheers,
Amit Daniel

Will


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