Re: [PATCH v3 3/6] Add LKDTM test to hijack a patch mapping (powerpc, x86_64)

Hi "Christopher, Thank you for the patch! Yet something to improve: [auto build test ERROR on powerpc/next] [also build test ERROR on char-misc/char-misc-testing tip/x86/core v5.9-rc2 next-20200827] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch

Re: [PATCH v3 3/6] Add LKDTM test to hijack a patch mapping (powerpc, x86_64)

Hi "Christopher, Thank you for the patch! Yet something to improve: [auto build test ERROR on powerpc/next] [also build test ERROR on char-misc/char-misc-testing tip/x86/core v5.9-rc2 next-20200827] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch

[PATCH v3 3/6] Add LKDTM test to hijack a patch mapping (powerpc, x86_64)

When live patching with STRICT_KERNEL_RWX, the CPU doing the patching must temporarily remap the page(s) containing the patch site with +W permissions. While this temporary mapping is in use another CPU could write to the same mapping and maliciously alter kernel text. Implement a LKDTM test to att