Messages in this thread |  | | From | Keith Owens <> | Subject | Re: SMP races in proc with thread_struct | Date | Sat, 05 May 2001 09:27:28 +1000 |
| |
On 04 May 2001 15:11:37 +0200, Andreas Schwab <schwab@suse.de> wrote: >Keith Owens <kaos@ocs.com.au> writes: >|> Wrap the reference to the parent task structure with exception table >|> recovery code, like copy_from_user(). > >Exception tables only protect accesses to user virtual memory. Kernel >memory references must always be valid in the first place.
Wrong. Exception tables say that if the kernel gets an exception between labels A and B then branch to fixup label C. See show_regs() in arch/i386/kernel/process.c and wrmsr_eio() in arch/i386/kernel/msr.c for examples which do not depend on user virtual memory.
- 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/
|  |