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Re: autoloading compat43 on tty ioctls

On Sat, Oct 10, 2020 at 01:33:42PM +0000, nia wrote:
> syzkaller found a bug in tty_43.c which i noticed could lock up my
> system after i wrote a reproducer for it.
> i was curious why 43bsd compat is enabled by default on amd64 then
> noticed it gets loaded by tty if it detects an unrecognized ioctl
> this seems to be a strange choice, especially on archs that never ran
> 43bsd binaries. were applications relying on these ioctls more recently?
> i'm not familiar with the history of this code, but maybe someone here is

it looks like maxv disabled compat43 in amd64 GENERIC in 2017

is its autoloading by tty an oversight?

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