On 26/2/20 5:35 pm, Russell Currey wrote:
There are a couple of reasons that the set_memory() functions are problematic when STRICT_KERNEL_RWX isn't enabled: - The linear mapping is a different size and apply_to_page_range() may modify a giant section, breaking everything - patch_instruction() doesn't know to work around a page being marked RO, and will subsequently crash The latter can be replicated by building a kernel with the set_memory() patches but with STRICT_KERNEL_RWX off and running ftracetest. Reported-by: Jordan Niethe <jniethe5@xxxxxxxxx> Signed-off-by: Russell Currey <ruscur@xxxxxxxxxx>
Can we squash this in earlier in the series for the sake of bisectability? -- Andrew Donnellan OzLabs, ADL Canberra ajd@xxxxxxxxxxxxx IBM Australia Limited
