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Date: Thu, 25 Feb 2021 18:07:06 +0200
From: Mike Rapoport <rppt@...ux.ibm.com>
To: George Kennedy <george.kennedy@...cle.com>
Cc: David Hildenbrand <david@...hat.com>,
Andrey Konovalov <andreyknvl@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Catalin Marinas <catalin.marinas@....com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Konrad Rzeszutek Wilk <konrad@...nok.org>,
Will Deacon <will.deacon@....com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>,
Marco Elver <elver@...gle.com>,
Peter Collingbourne <pcc@...gle.com>,
Evgenii Stepanov <eugenis@...gle.com>,
Branislav Rankov <Branislav.Rankov@....com>,
Kevin Brodsky <kevin.brodsky@....com>,
Christoph Hellwig <hch@...radead.org>,
kasan-dev <kasan-dev@...glegroups.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux Memory Management List <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Dhaval Giani <dhaval.giani@...cle.com>
Subject: Re: [PATCH] mm, kasan: don't poison boot memory
On Thu, Feb 25, 2021 at 10:22:44AM -0500, George Kennedy wrote:
>
> > > > > On 2/24/2021 5:37 AM, Mike Rapoport wrote:
>
> Applied just your latest patch, but same failure.
>
> I thought there was an earlier comment (which I can't find now) that stated
> that memblock_reserve() wouldn't reserve the page, which is what's needed
> here.
Actually, I think that memblock_reserve() should be just fine, but it seems
I'm missing something in address calculation each time.
What would happen if you stuck
memblock_reserve(0xbe453000, PAGE_SIZE);
say, at the beginning of find_ibft_region()?
> [ 30.308229] iBFT detected..
> [ 30.308796]
> ==================================================================
> [ 30.308890] BUG: KASAN: use-after-free in ibft_init+0x134/0xc33
> [ 30.308890] Read of size 4 at addr ffff8880be453004 by task swapper/0/1
> [ 30.308890]
> [ 30.308890] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.11.0-f9593a0 #12
> [ 30.308890] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 0.0.0 02/06/2015
> [ 30.308890] Call Trace:
> [ 30.308890] dump_stack+0xdb/0x120
> [ 30.308890] ? ibft_init+0x134/0xc33
> [ 30.308890] print_address_description.constprop.7+0x41/0x60
> [ 30.308890] ? ibft_init+0x134/0xc33
> [ 30.308890] ? ibft_init+0x134/0xc33
> [ 30.308890] kasan_report.cold.10+0x78/0xd1
> [ 30.308890] ? ibft_init+0x134/0xc33
> [ 30.308890] __asan_report_load_n_noabort+0xf/0x20
> [ 30.308890] ibft_init+0x134/0xc33
> [ 30.308890] ? write_comp_data+0x2f/0x90
> [ 30.308890] ? ibft_check_initiator_for+0x159/0x159
> [ 30.308890] ? write_comp_data+0x2f/0x90
> [ 30.308890] ? ibft_check_initiator_for+0x159/0x159
> [ 30.308890] do_one_initcall+0xc4/0x3e0
> [ 30.308890] ? perf_trace_initcall_level+0x3e0/0x3e0
> [ 30.308890] ? unpoison_range+0x14/0x40
> [ 30.308890] ? ____kasan_kmalloc.constprop.5+0x8f/0xc0
> [ 30.308890] ? kernel_init_freeable+0x420/0x652
> [ 30.308890] ? __kasan_kmalloc+0x9/0x10
> [ 30.308890] ? __sanitizer_cov_trace_pc+0x21/0x50
> [ 30.308890] kernel_init_freeable+0x596/0x652
> [ 30.308890] ? console_on_rootfs+0x7d/0x7d
> [ 30.308890] ? __sanitizer_cov_trace_pc+0x21/0x50
> [ 30.308890] ? rest_init+0xf0/0xf0
> [ 30.308890] kernel_init+0x16/0x1d0
> [ 30.308890] ? rest_init+0xf0/0xf0
> [ 30.308890] ret_from_fork+0x22/0x30
> [ 30.308890]
> [ 30.308890] The buggy address belongs to the page:
> [ 30.308890] page:0000000001b7b17c refcount:0 mapcount:0
> mapping:0000000000000000 index:0x1 pfn:0xbe453
> [ 30.308890] flags: 0xfffffc0000000()
> [ 30.308890] raw: 000fffffc0000000 ffffea0002ef9788 ffffea0002f91488
> 0000000000000000
> [ 30.308890] raw: 0000000000000001 0000000000000000 00000000ffffffff
> 0000000000000000
> [ 30.308890] page dumped because: kasan: bad access detected
> [ 30.308890] page_owner tracks the page as freed
> [ 30.308890] page last allocated via order 0, migratetype Movable,
> gfp_mask 0x100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 204, ts 28121288605
> [ 30.308890] prep_new_page+0xfb/0x140
> [ 30.308890] get_page_from_freelist+0x3503/0x5730
> [ 30.308890] __alloc_pages_nodemask+0x2d8/0x650
> [ 30.308890] alloc_pages_vma+0xe2/0x560
> [ 30.308890] __handle_mm_fault+0x930/0x26c0
> [ 30.308890] handle_mm_fault+0x1f9/0x810
> [ 30.308890] do_user_addr_fault+0x6f7/0xca0
> [ 30.308890] exc_page_fault+0xaf/0x1a0
> [ 30.308890] asm_exc_page_fault+0x1e/0x30
> [ 30.308890] page last free stack trace:
> [ 30.308890] free_pcp_prepare+0x122/0x290
> [ 30.308890] free_unref_page_list+0xe6/0x490
> [ 30.308890] release_pages+0x2ed/0x1270
> [ 30.308890] free_pages_and_swap_cache+0x245/0x2e0
> [ 30.308890] tlb_flush_mmu+0x11e/0x680
> [ 30.308890] tlb_finish_mmu+0xa6/0x3e0
> [ 30.308890] exit_mmap+0x2b3/0x540
> [ 30.308890] mmput+0x11d/0x450
> [ 30.308890] do_exit+0xaa6/0x2d40
> [ 30.308890] do_group_exit+0x128/0x340
> [ 30.308890] __x64_sys_exit_group+0x43/0x50
> [ 30.308890] do_syscall_64+0x37/0x50
> [ 30.308890] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 30.308890]
> [ 30.308890] Memory state around the buggy address:
> [ 30.308890] ffff8880be452f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ff ff
> [ 30.308890] ffff8880be452f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ff ff
> [ 30.308890] >ffff8880be453000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ff ff
> [ 30.308890] ^
> [ 30.308890] ffff8880be453080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ff ff
> [ 30.308890] ffff8880be453100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> ff ff
> [ 30.308890]
> ==================================================================
>
> George
>
--
Sincerely yours,
Mike.
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