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Date: Wed, 8 Apr 2015 09:36:47 +0800
From: Xishi Qiu <qiuxishi@...wei.com>
To: Dave Young <dyoung@...hat.com>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
<tglx@...utronix.de>, <bhe@...hat.com>,
<akpm@...ux-foundation.org>, <isimatu.yasuaki@...fujitsu.com>,
<mingo@...hat.com>, <hpa@...or.com>
Subject: Re: [PATCH V2] x86/numa: kernel stack corruption fix
On 2015/4/7 21:41, Dave Young wrote:
> I got below kernel panic during kdump test on Thinkpad T420 laptop:
>
> [ 0.000000] No NUMA configuration found
> [ 0.000000] Faking a node at [mem 0x0000000000000000-0x0000000037ba4fff]
> [ 0.000000] Kernel panic - not syncing: stack-protector: Kernel stack is cor
> upted in: ffffffff81d21910 r
> [ 0.000000]
> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.0.0-rc6+ #44
> [ 0.000000] Hardware name: LENOVO 4236NUC/4236NUC, BIOS 83ET76WW (1.46 ) 07/
> 5/2013 0
> [ 0.000000] 0000000000000000 c70296ddd809e4f6 ffffffff81b67ce8 ffffffff817c
> a26 2
> [ 0.000000] 0000000000000000 ffffffff81a61c90 ffffffff81b67d68 ffffffff817b
> 8d2 c
> [ 0.000000] 0000000000000010 ffffffff81b67d78 ffffffff81b67d18 c70296ddd809
> 4f6 e
> [ 0.000000] Call Trace:
> [ 0.000000] [<ffffffff817c2a26>] dump_stack+0x45/0x57
> [ 0.000000] [<ffffffff817bc8d2>] panic+0xd0/0x204
> [ 0.000000] [<ffffffff81d21910>] ? numa_clear_kernel_node_hotplug+0xe6/0xf2
> [ 0.000000] [<ffffffff8107741b>] __stack_chk_fail+0x1b/0x20
> [ 0.000000] [<ffffffff81d21910>] numa_clear_kernel_node_hotplug+0xe6/0xf2
> [ 0.000000] [<ffffffff81d21e5d>] numa_init+0x1a5/0x520
> [ 0.000000] [<ffffffff81d222b1>] x86_numa_init+0x19/0x3d
> [ 0.000000] [<ffffffff81d22460>] initmem_init+0x9/0xb
> [ 0.000000] [<ffffffff81d0d00c>] setup_arch+0x94f/0xc82
> [ 0.000000] [<ffffffff81d05120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff817bd0bb>] ? printk+0x55/0x6b
> [ 0.000000] [<ffffffff81d05120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff81d05d9b>] start_kernel+0xe8/0x4d6
> [ 0.000000] [<ffffffff81d05120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff81d05120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff81d055ee>] x86_64_start_reservations+0x2a/0x2c
> [ 0.000000] [<ffffffff81d05751>] x86_64_start_kernel+0x161/0x184
> [ 0.000000] ---[ end Kernel panic - not syncing: stack-protector: Kernel sta
> k is corrupted in: ffffffff81d21910 c
> [ 0.000000]
> PANIC: early exception 0d rip 10:ffffffff8105d2a6 error 7eb cr2 ffff8800371dd00
> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.0.0-rc6+ #44 0
> [ 0.000000] Hardware name: LENOVO 4236NUC/4236NUC, BIOS 83ET76WW (1.46 ) 07/
> 5/2013 0
> [ 0.000000] 0000000000000000 c70296ddd809e4f6 ffffffff81b67c60 ffffffff817c
> a26 2
> [ 0.000000] 0000000000000096 ffffffff81a61c90 ffffffff81b67d68 fffffff00000
> 084 0000000000000a0d 0000000000000a00 0
> [ 0.000000] Call Trace:
> [ 0.000000] [<ffffffff817c2a26>] dump_stack+0x45/0x57
> [ 0.000000] [<ffffffff81d051b0>] early_idt_handler+0x90/0xb7
> [ 0.000000] [<ffffffff8105d2a6>] ? native_irq_enable+0x6/0x10
> [ 0.000000] [<ffffffff817bc9c5>] ? panic+0x1c3/0x204
> [ 0.000000] [<ffffffff81d21910>] ? numa_clear_kernel_node_hotplug+0xe6/0xf2
> [ 0.000000] [<ffffffff8107741b>] __stack_chk_fail+0x1b/0x20
> [ 0.000000] [<ffffffff81d21910>] numa_clear_kernel_node_hotplug+0xe6/0xf2
> [ 0.000000] [<ffffffff81d21e5d>] numa_init+0x1a5/0x520
> [ 0.000000] [<ffffffff81d222b1>] x86_numa_init+0x19/0x3d
> [ 0.000000] [<ffffffff81d22460>] initmem_init+0x9/0xb
> [ 0.000000] [<ffffffff81d0d00c>] setup_arch+0x94f/0xc82
> [ 0.000000] [<ffffffff81d05120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff817bd0bb>] ? printk+0x55/0x6b
> [ 0.000000] [<ffffffff81d05120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff81d05d9b>] start_kernel+0xe8/0x4d6
> [ 0.000000] [<ffffffff81d05120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff81d05120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff81d055ee>] x86_64_start_reservations+0x2a/0x2c
> [ 0.000000] [<ffffffff81d05751>] x86_64_start_kernel+0x161/0x184
> [ 0.000000] RIP 0x46
>
> This is caused by writing over end of numa mask bitmap.
>
> numa_clear_kernel_node try to set node id in a mask bitmap, it iterating all
> reserved region and assume every regions have valid nid. It is not true because
> There's an exception for some graphic memory quirks.
> See function trim_snb_memory in arch/x86/kernel/setup.c
>
> It is easily to reproduce the bug in kdump kernel because kdump kernel use
> pre-reserved memory instead of whole memory, but kexec pass other reserved
> memory ranges to 2nd kernel as well. like below in my test:
>
> kdump kernel ram 0x2d000000 - 0x37bfffff
> One of the reserved regions: 0x40000000 - 0x40100000 which includes 0x40004000,
> a page excluded in trim_snb_memory. For this memblock reserved region the nid
> is not set, it is still default value MAX_NUMNODES. later node_set will set bit
> MAX_NUMNODES thus stack corruption happen.
>
> This also happens when booting with mem= kernel commandline during my test.
>
> Fixing it by adding a check, do not call node_set in case nid is MAX_NUMNODES.
>
> Signed-off-by: Dave Young <dyoung@...hat.com>
> Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> ---
> arch/x86/mm/numa.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> --- linux.orig/arch/x86/mm/numa.c
> +++ linux/arch/x86/mm/numa.c
> @@ -482,9 +482,16 @@ static void __init numa_clear_kernel_nod
> &memblock.reserved, mb->nid);
> }
>
> - /* Mark all kernel nodes. */
> + /*
> + * Mark all kernel nodes.
> + *
> + * In case booting with mem=nn[kMG] or in kdump kernel, numa_meminfo
Hi Dave,
It should both set mem=xx and numa=off, then numa_meminfo may not include all
the memblock.reserved memory, right?
Thanks,
Xishi Qiu
> + * may not include all the memblock.reserved memory ranges because
> + * trim_snb_memory() reserves specific pages for Sandy Bridge graphics.
> + */
> for_each_memblock(reserved, r)
> - node_set(r->nid, numa_kernel_nodes);
> + if (r->nid != MAX_NUMNODES)
> + node_set(r->nid, numa_kernel_nodes);
>
> /* Clear MEMBLOCK_HOTPLUG flag for memory in kernel nodes. */
> for (i = 0; i < numa_meminfo.nr_blks; i++) {
>
> .
>
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