Re: [PATCH v3 21/36] arm64/mm: Implement map_shadow_stack()
From: Szabolcs Nagy <hidden>
Date: 2023-08-07 10:21:51
Also in:
kvmarm, linux-arm-kernel, linux-doc, linux-fsdevel, linux-kselftest, linux-mm, linux-riscv, lkml
The 07/31/2023 14:43, 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;
+
+ if (!system_supports_gcs())
+ return -EOPNOTSUPP;
+
+ if (flags)
+ return -EINVAL;
+
+ if (addr % 16)
+ return -EINVAL;mmap addr must be page aligned (and there is no align req on size). i'd expect similar api here.
+ + if (size == 16 || size % 16) + return -EINVAL;
why %16 and not %8 ?