Linus Torvalds writes: (Summary) wrote:
Put another way.
Put another way.
This is ok in the native path:
This is ok in the native path:
[...]
You simply can't have it both ways.Put another way.
Put another way.
This is ok in the native path:
This is ok in the native path:
if ((unsigned long) rseq_cs->abort_ip != rseq_cs->abort_ip)
return -EINVAL;
But it is NOT OK to say "the rseq system call doesn't have any compat
syscall, but we'll do that compat check in the native case, because we
worry about compat issues". Either you worry about compat issues (and have a
compat syscall), or you don't.
The whole "let's not do a compat syscall, but then check compat issues
at run-time in the native system call because compat processes will
use it" is braindamage.