On 01/12/2014 05:20 PM, Borislav Petkov wrote:
On Sun, Jan 12, 2014 at 05:20:00PM +0800, Qiaowei Ren wrote:+static bool allocate_bt(unsigned long bd_entry) +{ + unsigned long bt_size = 1UL << (MPX_L2_BITS+MPX_L2_SHIFT); + unsigned long bt_addr, old_val; + + bt_addr = sys_mmap_pgoff(0, bt_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE | MAP_POPULATE, -1, 0);Are we sure about this? We can do a possible memory allocation in mmap_region() in this exception handler context. And yes, we do a conditional_sti(), which makes it all the more susceptible. Have you run this with lockdep enabled?
Yes, I run this with lockdep enabled. Thanks, Qiaowei -- 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/
