Messages in this thread | | | Subject | Re: sudo x86info -a => kernel BUG at mm/usercopy.c:78! | From | Tommi Rantala <> | Date | Fri, 31 Mar 2017 08:44:43 +0300 |
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On 30.03.2017 20:44, Laura Abbott wrote: > On 03/30/2017 10:37 AM, Kees Cook wrote: >> >> Reads out of /dev/mem should be restricted to non-RAM on Fedora, yes? >> >> Tommi, do your kernels have CONFIG_STRICT_DEVMEM=y ? >> >> -Kees >> > > CONFIG_STRICT_DEVMEM should be on in all Fedora kernels.
Yes, the fedora kernels do have it enabled:
$ grep STRICT_DEVMEM /boot/config-4.9.14-200.fc25.x86_64 CONFIG_STRICT_DEVMEM=y CONFIG_IO_STRICT_DEVMEM=y
But I do not have it in my own build:
$ grep STRICT_DEVMEM .config # CONFIG_STRICT_DEVMEM is not set
-Tommi
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