linux-kernel - Re: [PATCH v3 4/9] clear the memory to store struct page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 19 Oct 2012 03:02:46 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	wency@...fujitsu.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	rientjes@...gle.com, liuj97@...il.com, len.brown@...el.com,
	benh@...nel.crashing.org, paulus@...ba.org, minchan.kim@...il.com,
	akpm@...ux-foundation.org, isimatu.yasuaki@...fujitsu.com
Subject: Re: [PATCH v3 4/9] clear the memory to store struct page

On Fri, Oct 19, 2012 at 2:46 AM,  <wency@...fujitsu.com> wrote:
> From: Wen Congyang <wency@...fujitsu.com>
>
> If sparse memory vmemmap is enabled, we can't free the memory to store
> struct page when a memory device is hotremoved, because we may store
> struct page in the memory to manage the memory which doesn't belong
> to this memory device. When we hotadded this memory device again, we
> will reuse this memory to store struct page, and struct page may
> contain some obsolete information, and we will get bad-page state:
>
> [   59.611278] init_memory_mapping: [mem 0x80000000-0x9fffffff]
> [   59.637836] Built 2 zonelists in Node order, mobility grouping on.  Total pages: 547617
> [   59.638739] Policy zone: Normal
> [   59.650840] BUG: Bad page state in process bash  pfn:9b6dc
> [   59.651124] page:ffffea0002200020 count:0 mapcount:0 mapping:          (null) index:0xfdfdfdfdfdfdfdfd
> [   59.651494] page flags: 0x2fdfdfdfd5df9fd(locked|referenced|uptodate|dirty|lru|active|slab|owner_priv_1|private|private_2|writeback|head|tail|swapcache|reclaim|swapbacked|unevictable|uncached|compound_lock)
> [   59.653604] Modules linked in: netconsole acpiphp pci_hotplug acpi_memhotplug loop kvm_amd kvm microcode tpm_tis tpm tpm_bios evdev psmouse serio_raw i2c_piix4 i2c_core parport_pc parport processor button thermal_sys ext3 jbd mbcache sg sr_mod cdrom ata_generic virtio_net ata_piix virtio_blk libata virtio_pci virtio_ring virtio scsi_mod
> [   59.656998] Pid: 988, comm: bash Not tainted 3.6.0-rc7-guest #12
> [   59.657172] Call Trace:
> [   59.657275]  [<ffffffff810e9b30>] ? bad_page+0xb0/0x100
> [   59.657434]  [<ffffffff810ea4c3>] ? free_pages_prepare+0xb3/0x100
> [   59.657610]  [<ffffffff810ea668>] ? free_hot_cold_page+0x48/0x1a0
> [   59.657787]  [<ffffffff8112cc08>] ? online_pages_range+0x68/0xa0
> [   59.657961]  [<ffffffff8112cba0>] ? __online_page_increment_counters+0x10/0x10
> [   59.658162]  [<ffffffff81045561>] ? walk_system_ram_range+0x101/0x110
> [   59.658346]  [<ffffffff814c4f95>] ? online_pages+0x1a5/0x2b0
> [   59.658515]  [<ffffffff8135663d>] ? __memory_block_change_state+0x20d/0x270
> [   59.658710]  [<ffffffff81356756>] ? store_mem_state+0xb6/0xf0
> [   59.658878]  [<ffffffff8119e482>] ? sysfs_write_file+0xd2/0x160
> [   59.659052]  [<ffffffff8113769a>] ? vfs_write+0xaa/0x160
> [   59.659212]  [<ffffffff81137977>] ? sys_write+0x47/0x90
> [   59.659371]  [<ffffffff814e2f25>] ? async_page_fault+0x25/0x30
> [   59.659543]  [<ffffffff814ea239>] ? system_call_fastpath+0x16/0x1b
> [   59.659720] Disabling lock debugging due to kernel taint
>
> This patch clears the memory to store struct page to avoid unexpected error.
>
> CC: David Rientjes <rientjes@...gle.com>
> CC: Jiang Liu <liuj97@...il.com>
> Cc: Minchan Kim <minchan.kim@...il.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> CC: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> Reported-by: Vasilis Liaskovitis <vasilis.liaskovitis@...fitbricks.com>
> Signed-off-by: Wen Congyang <wency@...fujitsu.com>

Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/