Messages in this thread | | | Date | Fri, 12 Sep 2014 15:58:01 -0700 | From | Dave Hansen <> | Subject | Re: [PATCH v8 04/10] x86, mpx: hook #BR exception handler to allocate bound tables |
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On 09/11/2014 01:46 AM, Qiaowei Ren wrote: > +static int allocate_bt(long __user *bd_entry) > +{ > + unsigned long bt_addr, old_val = 0; > + int ret = 0; > + > + bt_addr = mpx_mmap(MPX_BT_SIZE_BYTES); > + if (IS_ERR((void *)bt_addr)) > + return bt_addr; > + bt_addr = (bt_addr & MPX_BT_ADDR_MASK) | MPX_BD_ENTRY_VALID_FLAG;
Qiaowei, why do we need the "& MPX_BT_ADDR_MASK" here?
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