On Thu, Aug 01, 2024 at 01:06:49PM +0100, Mark Brown wrote:
> +SYSCALL_DEFINE3(map_shadow_stack, unsigned long, addr, unsigned long, size,
> unsigned int, flags)
> +{
> + unsigned long alloc_size;
> + unsigned long __user *cap_ptr;
> + unsigned long cap_val;
> + int ret = 0;
> +
As discussed extensively in the changelog for the addition of this
syscall on x86 ("x86/shstk: Introduce map_shadow_stack syscall") the
existing mmap() and madvise() syscalls do not map entirely well onto the
security requirements for guarded control stacks since they lead to
windows where memory i
