On Mon, Dec 7, 2015 at 9:15 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote: > On Tue, Dec 08, 2015 at 06:01:48AM +0100, Ingo Molnar wrote: > >> Hm, so if Sparc has no notion of compat-ness of the system call then how does it >> implement runtime compat checks, such as AUDIT_ARCH et al? > > Badly. Things like compat_sys_ioctl() vs. ioctl() work (we use different > arrays of function pointers in 32bit and 64bit traps), but anything > dynamic assumes that things match the task. Not that we had a lot of > such dynamic checks, actually... I wouldn't take x86 as a shining example of how to do this, but it does mostly work. In 4.4, it's not even all that messy, modulo a bunch of checks that check the wrong condition (hence, in part, this proposal). --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
