On Fri, 2023-03-10 at 17:11 +0100, Borislav Petkov wrote:

[...]

Thanks on all the text edits.

On Mon, Feb 27, 2023 at 02:29:49PM -0800, Rick Edgecombe wrote:

quoted

diff --git a/arch/x86/entry/syscalls/syscall_64.tbl

b/arch/x86/entry/syscalls/syscall_64.tbl
index c84d12608cd2..f65c671ce3b1 100644

--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl

@@ -372,6 +372,7 @@
 448	common	process_mrelease	sys_process_mreleas

e
 449	common	futex_waitv		sys_futex_waitv
 450	common	set_mempolicy_home_node	sys_set_mempolicy_h
ome_node
+451	64	map_shadow_stack	sys_map_shadow_stack

Yeah, this'll need a manpage too, I presume. But later.

I have one to submit.

[...]

quoted

+
+	if (addr && addr <= 0xFFFFFFFF)

			< SZ_4G

quoted

+		return -EINVAL;

Can we use distinct negative retvals in each case so that it is clear
to
userspace where it fails, *if* it fails?

Good idea, I think maybe ERANGE.