[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core
Thursday, November 5, 2015, 2:53:40 PM, you wrote: > 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 Ah thx for the pointer :) -- Sander _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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