Messages in this thread | | | Date | Tue, 15 Dec 2015 23:07:09 +0100 | From | Pavel Machek <> | Subject | Re: 4.4-rc5: ugly warn on: 5 W+X pages found |
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On Tue 2015-12-15 22:33:59, Borislav Petkov wrote: > On Tue, Dec 15, 2015 at 09:58:35PM +0100, Pavel Machek wrote: > > [ 0.000000] Base memory trampoline at [c009b000] 9b000 size 16384 > > [ 0.000000] ------------[ cut here ]------------ > > [ 0.000000] WARNING: CPU: 0 PID: 0 at > > ./arch/x86/include/asm/pgtable.h:357 kernel_physical_mapping_init+0x > > 256/0x395() > > [ 0.000000] Modules linked in: > > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.4.0-rc5+ #137 > > [ 0.000000] Hardware name: LENOVO 17097HU/17097HU, BIOS 7BETD8WW > > (2.19 ) 03/31/2011 > > [ 0.000000] 00000000 00000000 c4e63e90 c42baaf8 00000000 c4e63eac > > c404066b 00000165 > > [ 0.000000] c4f134da 00000000 00000000 00000000 c4e63ebc c404070f > > 00000009 00000000 > > [ 0.000000] c4e63f18 c4f134da c4e63f00 00000000 00000000 00000000 > > 00000000 00000000 > > [ 0.000000] Call Trace: > > [ 0.000000] [<c42baaf8>] dump_stack+0x41/0x59 > > [ 0.000000] [<c404066b>] warn_slowpath_common+0x6b/0xa0 > > [ 0.000000] [<c4f134da>] ? > > kernel_physical_mapping_init+0x256/0x395 > > [ 0.000000] [<c404070f>] warn_slowpath_null+0xf/0x20 > > [ 0.000000] [<c4f134da>] kernel_physical_mapping_init+0x256/0x395 > > [ 0.000000] [<c4a4de21>] init_memory_mapping+0x191/0x300 > > [ 0.000000] [<c4f12d96>] init_mem_mapping+0xe7/0x1f3 > > Looks like the ISA range to me: > > init_mem_mapping: > > ... > > /* the ISA range is always mapped regardless of memory holes */ > init_memory_mapping(0, ISA_END_ADDRESS); > > Does that kernel_physical_mapping_init() even pay attention to > __supported_pte_mask and thus _PAGE_NX? I don't see it.
Mystery solved, and prize goes to the lguest.
Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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