On Mon, 2014-03-17 at 14:25 +1030, Rusty Russell wrote:
> Erk, our tests are insufficient. Testbuilding an allmodconfig with this
> now:
Good idea.
> diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
[]
> @@ -188,6 +188,9 @@ struct kparam_array
> /* Default value instead of permissions? */ \
> static int __param_perm_check_##name __attribute__((unused)) = \
> BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)) \
> + /* User perms >= group perms >= other perms. */ \
> + + BUILD_BUG_ON_ZERO(((perm) >> 6) < (((perm) >> 3) & 7)) \
> + + BUILD_BUG_ON_ZERO((((perm) >> 3) & 7) < ((perm) & 7)) \
> + BUILD_BUG_ON_ZERO(sizeof(""prefix) > MAX_PARAM_PREFIX_LEN); \
> static const char __param_str_##name[] = prefix #name; \
> static struct kernel_param __moduleparam_const __param_##name \
It might make sense to separate this octal permissions
test into a new macro for other checks in macros like
CLASS_ATTR, DEVICE_ATTR, SENSOR_ATTR and SENSOR_ATTR_2.
Maybe something like:
#define VERIFY_OCTAL_PERMISSIONS(perm) \
static int __param_perm_check_##name __attribute__((unused)) = \
BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)) \
/* User perms >= group perms >= other perms. */ \
+ BUILD_BUG_ON_ZERO(((perm) >> 6) < (((perm) >> 3) & 7)) \
+ BUILD_BUG_ON_ZERO((((perm) >> 3) & 7) < ((perm) & 7)); \
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