Re: [PATCH -next v2] riscv: add VMAP_STACK overflow detection

From: Jisheng Zhang <jszhang3@mail.ustc.edu.cn>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: Tong Tiangen <tongtiangen@huawei.com>, <palmerdabbelt@google.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	<linux-riscv@lists.infradead.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -next v2] riscv: add VMAP_STACK overflow detection
Date: Fri, 16 Jul 2021 20:53:32 +0800	[thread overview]
Message-ID: <20210716205332.5856df78@xhacker> (raw)
In-Reply-To: <87pmvjtumc.fsf@igel.home>

Hi Andreas,

On Thu, 15 Jul 2021 18:22:19 +0200
Andreas Schwab <schwab@linux-m68k.org> wrote:

> On Jun 21 2021, Tong Tiangen wrote:
> 
> > This patch adds stack overflow detection to riscv, usable when
> > CONFIG_VMAP_STACK=y.  
> 
> This breaks get_wchan:

I can't reproduce the panic error. Mind to share your .config?

Thanks in advance

> 
> [   65.609696] Unable to handle kernel paging request at virtual address ffffffd0003bbde8
> [   65.610460] Oops [#1]
> [   65.610626] Modules linked in: virtio_blk virtio_mmio rtc_goldfish btrfs blake2b_generic libcrc32c xor raid6_pq sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua efivarfs
> [   65.611670] CPU: 2 PID: 1 Comm: systemd Not tainted 5.14.0-rc1-1.g34fe32a-default #1 openSUSE Tumbleweed (unreleased) c62f7109153e5a0897ee58ba52393ad99b070fd2
> [   65.612334] Hardware name: riscv-virtio,qemu (DT)
> [   65.613008] epc : get_wchan+0x5c/0x88
> [   65.613334]  ra : get_wchan+0x42/0x88
> [   65.613625] epc : ffffffff800048a4 ra : ffffffff8000488a sp : ffffffd00021bb90
> [   65.614008]  gp : ffffffff817709f8 tp : ffffffe07fe91b80 t0 : 00000000000001f8
> [   65.614411]  t1 : 0000000000020000 t2 : 0000000000000000 s0 : ffffffd00021bbd0
> [   65.614818]  s1 : ffffffd0003bbdf0 a0 : 0000000000000001 a1 : 0000000000000002
> [   65.615237]  a2 : ffffffff81618008 a3 : 0000000000000000 a4 : 0000000000000000
> [   65.615637]  a5 : ffffffd0003bc000 a6 : 0000000000000002 a7 : ffffffe27d370000
> [   65.616022]  s2 : ffffffd0003bbd90 s3 : ffffffff8071a81e s4 : 0000000000003fff
> [   65.616407]  s5 : ffffffffffffc000 s6 : 0000000000000000 s7 : ffffffff81618008
> [   65.616845]  s8 : 0000000000000001 s9 : 0000000180000040 s10: 0000000000000000
> [   65.617248]  s11: 000000000000016b t3 : 000000ff00000000 t4 : 0c6aec92de5e3fd7
> [   65.617672]  t5 : fff78f60608fcfff t6 : 0000000000000078
> [   65.618088] status: 0000000000000120 badaddr: ffffffd0003bbde8 cause: 000000000000000d
> [   65.618621] [<ffffffff800048a4>] get_wchan+0x5c/0x88
> [   65.619008] [<ffffffff8022da88>] do_task_stat+0x7a2/0xa46
> [   65.619325] [<ffffffff8022e87e>] proc_tgid_stat+0xe/0x16
> [   65.619637] [<ffffffff80227dd6>] proc_single_show+0x46/0x96
> [   65.619979] [<ffffffff801ccb1e>] seq_read_iter+0x190/0x31e
> [   65.620341] [<ffffffff801ccd70>] seq_read+0xc4/0x104
> [   65.620633] [<ffffffff801a6bfe>] vfs_read+0x6a/0x112
> [   65.620922] [<ffffffff801a701c>] ksys_read+0x54/0xbe
> [   65.621206] [<ffffffff801a7094>] sys_read+0xe/0x16
> [   65.621474] [<ffffffff8000303e>] ret_from_syscall+0x0/0x2
> [   65.622169] ---[ end trace f24856ed2b8789c5 ]---
> [   65.622832] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
> 
> Andreas.
> 

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