ACK: [PATCH 1/1] arm64: make sys_call_table const

[Colin Ian King]

On 09/06/17 15:40, Brad Figg wrote:
> From: Mark Rutland <mark.rutland at arm.com>
> 
> CVE-2015-8967
> 
> As with x86, mark the sys_call_table const such that it will be placed
> in the .rodata section. This will cause attempts to modify the table
> (accidental or deliberate) to fail when strict page permissions are in
> place. In the absence of strict page permissions, there should be no
> functional change.
> 
> Signed-off-by: Mark Rutland <mark.rutland at arm.com>
> Acked-by: Will Deacon <will.deacon at arm.com>
> Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
> (cherry picked from commit c623b33b4e9599c6ac5076f7db7369eb9869aa04)
> Signed-off-by: Brad Figg <brad.figg at canonical.com>
> ---
>  arch/arm64/kernel/sys.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c
> index 3fa98ff..df20b79 100644
> --- a/arch/arm64/kernel/sys.c
> +++ b/arch/arm64/kernel/sys.c
> @@ -50,7 +50,7 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
>   * The sys_call_table array must be 4K aligned to be accessible from
>   * kernel/entry.S.
>   */
> -void *sys_call_table[__NR_syscalls] __aligned(4096) = {
> +void * const sys_call_table[__NR_syscalls] __aligned(4096) = {
>  	[0 ... __NR_syscalls - 1] = sys_ni_syscall,
>  #include <asm/unistd.h>
>  };
> 

Clean cherry pick, looks good.

Acked-by: Colin Ian King <colin.king at canonical.com>