On Tue, Nov 17, 2020 at 10:28:36PM -0500, Gabriel Krisman Bertazi wrote:

  prctl(PR_SET_SYSCALL_USER_DISPATCH, <op>, <off>, <length>, [selector])

The range [<offset>,<offset>+len] is a part of the process memory map

+	if (likely(instruction_pointer(regs) - sd->offset < sd->len))
+		return false;

The actual implementation ^ is: [<offset>, <offset>+<length>).

Which seems consistent and right, so I would suggest simply changing the
Changelog, something that could be done when applying.