[v2,0/2] staging: vc04_services: Use %p to log pointer

Message

Umang Jain Nov. 28, 2023, 8:20 p.m. UTC

%lx is used to print the unmodified pointer address for debugging.
%p will print the hashed pointer address to avoid leaking information
about kernel memory layout to userspace. But when `no_hash_pointers`
is passed as kernel parameter, unmodified pointer address will be
printed.

Hence, drop %lx in favour of %p. For debugging purposes, one can
easily depend on `no_hash_pointers`.

This also solves the following smatch warnings:
service_callback() warn: argument 7 to %lx specifier is cast from pointer
service_callback() warn: argument 11 to %lx specifier is cast from pointer
service_callback() warn: argument 12 to %lx specifier is cast from pointer
service_callback() warn: argument 13 to %lx specifier is cast from pointer
vchiq_release() warn: argument 7 to %lx specifier is cast from pointer

Changes in v2:
- Built/Rebased on top of:
  [PATCH v2 0/5] staging: vc04_services: Drop custom logging

Umang Jain (2):
  staging: vc04_services: Use %p to log pointer address
  staging: vc04_services: Use %p to log pointer address

 .../staging/vc04_services/interface/vchiq_arm/vchiq_arm.c  | 7 +++----
 .../staging/vc04_services/interface/vchiq_arm/vchiq_dev.c  | 2 +-
 2 files changed, 4 insertions(+), 5 deletions(-)

Comments

Greg KH Dec. 4, 2023, 7:08 a.m. UTC | #1

On Wed, Nov 29, 2023 at 01:50:05AM +0530, Umang Jain wrote:
> %lx is used to print the unmodified pointer address for debugging.
> %p will print the hashed pointer address to avoid leaking information
> about kernel memory layout to userspace. But when `no_hash_pointers`
> is passed as kernel parameter, unmodified pointer address will be
> printed.
> 
> Hence, drop %lx in favour of %p. For debugging purposes, one can
> easily depend on `no_hash_pointers`.
> 
> This also solves the following smatch warnings:
> service_callback() warn: argument 7 to %lx specifier is cast from pointer
> service_callback() warn: argument 11 to %lx specifier is cast from pointer
> service_callback() warn: argument 12 to %lx specifier is cast from pointer
> service_callback() warn: argument 13 to %lx specifier is cast from pointer
> vchiq_release() warn: argument 7 to %lx specifier is cast from pointer
> 
> Changes in v2:
> - Built/Rebased on top of:
>   [PATCH v2 0/5] staging: vc04_services: Drop custom logging
> 
> Umang Jain (2):
>   staging: vc04_services: Use %p to log pointer address
>   staging: vc04_services: Use %p to log pointer address

You have 2 different patches that do different things, yet have the
identical subject lines.  That needs to be fixed up before I can take
them.

thanks,

greg k-h