On 11/05/2015 04:13 AM, Sander Eikelenboom wrote:
It makes "cat /sys/kernel/debug/kernel_page_tables" work and
prevents a kernel with CONFIG_DEBUG_WX=y from crashing at boot.
Great. Our nightly runs also failed spectacularly due to this bug.
It now does give a warning about an insecure W+X mapping, so
CONFIG_DEBUG_WX=y
seems to be working. No idea how to interpret it though (and if it's a
legit
warning).
--
Sander
[ 19.034706] Freeing unused kernel memory: 1104K (ffffffff822fc000 -
ffffffff82410000)
[ 19.041339] Write protecting the kernel read-only data: 18432k
[ 19.052596] Freeing unused kernel memory: 1144K (ffff880001ae2000 -
ffff880001c00000)
[ 19.060285] Freeing unused kernel memory: 1560K (ffff88000207a000 -
ffff880002200000)
[ 19.067079] ------------[ cut here ]------------
[ 19.073931] WARNING: CPU: 5 PID: 1 at
arch/x86/mm/dump_pagetables.c:225 note_page+0x619/0x7e0()
Yes, this apparently is a known issue: https://lkml.org/lkml/2015/11/4/476
-boris
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