Re: [PATCH 6.6] sched/task_stack: fix object_is_on_stack() for KASAN tagged pointers

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

The upstream commit SHA1 provided is correct: fd7b4f9f46d46acbc7af3a439bb0d869efdc5c58

WARNING: Author mismatch between patch and upstream commit:
Backport author: Wenshan Lan <jetlan9@163.com>
Commit author: Qun-Wei Lin <qun-wei.lin@mediatek.com>


Status in newer kernel trees:
6.12.y | Present (exact SHA1)
6.6.y | Not found

Note: The patch differs from the upstream commit:
---
1:  fd7b4f9f46d4 ! 1:  3e999d5c22ab sched/task_stack: fix object_is_on_stack() for KASAN tagged pointers
    @@ Metadata
      ## Commit message ##
         sched/task_stack: fix object_is_on_stack() for KASAN tagged pointers
     
    +    [ Upstream commit fd7b4f9f46d46acbc7af3a439bb0d869efdc5c58 ]
    +
         When CONFIG_KASAN_SW_TAGS and CONFIG_KASAN_STACK are enabled, the
         object_is_on_stack() function may produce incorrect results due to the
         presence of tags in the obj pointer, while the stack pointer does not have
    @@ Commit message
         Cc: Shakeel Butt <shakeel.butt@linux.dev>
         Cc: <stable@vger.kernel.org>
         Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    +    [ Resolve line conflicts ]
    +    Signed-off-by: Wenshan Lan <jetlan9@163.com>
     
      ## include/linux/sched/task_stack.h ##
     @@
    + 
      #include <linux/sched.h>
      #include <linux/magic.h>
    - #include <linux/refcount.h>
     +#include <linux/kasan.h>
      
      #ifdef CONFIG_THREAD_INFO_IN_TASK
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.6.y        |  Success    |  Success   |