Messages in this thread | | | Subject | Re: [PATCH v11 25/25] x86/cet/shstk: Add arch_prctl functions for shadow stack | From | "Yu, Yu-cheng" <> | Date | Tue, 1 Sep 2020 10:58:25 -0700 |
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On 9/1/2020 10:50 AM, Florian Weimer wrote: > * Yu-cheng Yu: > >> Like other arch_prctl()'s, this parameter was 'unsigned long' >> earlier. The idea was, since this arch_prctl is only implemented for >> the 64-bit kernel, we wanted it to look as 64-bit only. I will change >> it back to 'unsigned long'. > > What about x32? In general, long is rather problematic for x32.
The problem is the size of 'long', right? Because this parameter is passed in a register, and only the lower bits are used, x32 works as well.
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