Re: [PATCH v4 3/3] MIPS: set stack/data protection as non-executable

[David Daney <ddaney@caviumnetworks.com>]

On 08/05/2015 04:49 PM, Leonid Yegoshin wrote:
> This is a last step of 3 patches which shift FPU emulation out of
> stack into protected area. So, it disables a default executable stack.
>

NAK.

You cannot change the default.

If you want a non-executable stack, the program has to request it with 
the proper annotations in its ELF file.

David Daney.


> Additionally, it sets a default data area non-executable protection.
>
> Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
> ---
>   arch/mips/include/asm/page.h |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
> index 89dd7fed1a57..0b6cec4a1b80 100644
> --- a/arch/mips/include/asm/page.h
> +++ b/arch/mips/include/asm/page.h
> @@ -228,7 +228,7 @@ extern int __virt_addr_valid(const volatile void *kaddr);
>   #define virt_addr_valid(kaddr)						\
>   	__virt_addr_valid((const volatile void *) (kaddr))
>
> -#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
> +#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | \
>   				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
>
>   #define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
>