Messages in this thread | | | Subject | Re: FW: i386 Linux kernel DoS (clarification) | From | Alan Cox <> | Date | 13 Nov 2002 21:47:07 +0000 |
| |
On Wed, 2002-11-13 at 21:13, Petr Vandrovec wrote: > This fixes it for me. I'll have to look at ia32 manual at home, why I > must do pushl %eax & popfl, as NT should be already cleared by > do_debug(). I probably miss something obvious, but I do not think that > adding these three instructions into lcall7/27 fastpath is acceptable.
I dont think you can avoid it without ceasing to be clever. The problem is Linus or someone pulled a nifty track so that we do an lcall in and an iret.
lcall doesnt clear NT iret when it sees NT is set performs a task switch to the link field in the current TSS.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |