On Wed, 2017-10-11 at 14:48 +1100, Tobin C. Harding wrote:
> Currently there are many places in the kernel where addresses are being
> printed using an unadorned %p. Kernel pointers should be printed using
> %pK allowing some control via the kptr_restrict sysctl. Exposing addresses
> gives attackers sensitive information about the kernel layout in memory.
[]
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
[]
> @@ -1591,6 +1591,35 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
> return widen_string(buf, buf - buf_start, end, spec);
> }
>
> +static long get_random_odd_long(void)
> +{
> + long val = 0;
> +
> + while((val & 1) == 0) {
> + val = get_random_long();
> + }
> +
> + return val;
> +}
Perhaps
static long get_random_odd_long(void)
{
return get_random_long() | 1L;
}
