Messages in this thread | | | Subject | Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core | From | Boris Ostrovsky <> | Date | Thu, 5 Nov 2015 08:53:40 -0500 |
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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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