> +#define printk(fmt, ...) do { \
> + compiletime_assert(__builtin_constant_p(fmt), \
> + "Non-constant format string"); \
> + printk(fmt, ##__VA_ARGS__); \
> +} while (0)
May I recommend __builtin_constant_p(*fmt). Since:
char buf[OVERFLOW_VULNERABILITY];
strcpy(buf, malicious_format);
printk(buf, args)
has __builtin_constant_p(buf), but it's not a constant format string.
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