On Tue, 2 Feb 2021 20:15:41 +1100, Alexey Kardashevskiy wrote:
> Since de78a9c "powerpc: Add a framework for Kernel Userspace Access
> Protection", user access helpers call user_{read|write}_access_{begin|end}
> when user space access is allowed.
>
> 890274c "powerpc/64s: Implement KUAP for Radix
Hello,
On Tue, Feb 02, 2021 at 08:15:41PM +1100, Alexey Kardashevskiy wrote:
> Since de78a9c "powerpc: Add a framework for Kernel Userspace Access
> Protection", user access helpers call user_{read|write}_access_{begin|end}
> when user space access is allowed.
>
> 890274c "powerpc/64s: Implement
Since de78a9c "powerpc: Add a framework for Kernel Userspace Access
Protection", user access helpers call user_{read|write}_access_{begin|end}
when user space access is allowed.
890274c "powerpc/64s: Implement KUAP for Radix MMU" made the mentioned
helpers program a AMR special register to allow
Hi Alexey,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on powerpc/next]
[also build test ERROR on linus/master v5.10-rc6 next-20201201]
[cannot apply to scottwood/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting
When interrupted in raw_copy_from_user()/... after user memory access
is enabled, a nested handler may also access user memory (perf is
one example) and when it does so, it calls prevent_read_from_user()
which prevents the upper handler from accessing user memory.
This saves/restores AMR when
