On Wed, Aug 27, 2014 at 02:55:46PM +0900, AKASHI Takahiro wrote:
1)
setting x0 to -ENOSYS is necessary because, otherwise, user-issued syscall(-1) will
return a bogus value when audit tracing is on.
Please note that, on arm,
not traced traced
------ ------
syscall(-1) aborted OOPs(BUG_ON)
syscall(-3000) aborted aborted
syscall(1000) ENOSYS ENOSYS
Two points here:
1. You've found a case which causes a BUG_ON(). Where is the bug report
for this, so the problem can be investigated and resolved?
2. What do you mean by "aborted" ?
Please, if you find a problem with 32-bit ARM, report it. Don't hide it,
because hiding it can be a security issue or in the case of BUG_ON(), it
could be a denial of service issue.
As you're part of Linaro, I would have thought you'd be more responsible
in this regard - after all, Linaro is supposed to be about improving the
ARM kernel... Maybe I got that wrong, and Linaro is actually about
ensuring that the ARM kernel is stuffed full of broken features?