On Thu, Apr 23, 2015 at 10:01:16PM +0200, Denys Vlasenko wrote: > Naturally, CS can't be NULL, and up until today > I thought SS also can't. But the bit is probably implemented > for all eight cached descriptors.
There's this section about NULL selector in APM v2. It says that NULL selectors are used to invalidate segment registers and software can load a NULL selector in SS in CPL0. So, if an interrupt happens and as you quoted earlier that SS gets set to NULL as a result of an interrupt, there's that SS leak causing the SS exception. -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/