lkml.org 
[lkml]   [2022]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH -next] arm/stacktrace, kasan: Silence KASAN warnings in unwind_frame()
On Thu, Mar 17, 2022 at 05:07:51PM +0800, Lin Yujun wrote:
> The following KASAN warning is detected by QEMU.
>
> ==================================================================
> BUG: KASAN: stack-out-of-bounds in unwind_frame+0x508/0x870
> Read of size 4 at addr c36bba90 by task cat/163
>
> CPU: 1 PID: 163 Comm: cat Not tainted 5.10.0-rc1 #40
> Hardware name: ARM-Versatile Express
> [<c0113fac>] (unwind_backtrace) from [<c010e71c>] (show_stack+0x10/0x14)
> [<c010e71c>] (show_stack) from [<c0b805b4>] (dump_stack+0x98/0xb0)
> [<c0b805b4>] (dump_stack) from [<c0b7d658>] (print_address_description.constprop.0+0x58/0x4bc)
> [<c0b7d658>] (print_address_description.constprop.0) from [<c031435c>] (kasan_report+0x154/0x170)
> [<c031435c>] (kasan_report) from [<c0113c44>] (unwind_frame+0x508/0x870)
> [<c0113c44>] (unwind_frame) from [<c010e298>] (__save_stack_trace+0x110/0x134)
> [<c010e298>] (__save_stack_trace) from [<c01ce0d8>] (stack_trace_save+0x8c/0xb4)
> [<c01ce0d8>] (stack_trace_save) from [<c0313520>] (kasan_set_track+0x38/0x60)
> [<c0313520>] (kasan_set_track) from [<c0314cb8>] (kasan_set_free_info+0x20/0x2c)
> [<c0314cb8>] (kasan_set_free_info) from [<c0313474>] (__kasan_slab_free+0xec/0x120)
> [<c0313474>] (__kasan_slab_free) from [<c0311e20>] (kmem_cache_free+0x7c/0x334)
> [<c0311e20>] (kmem_cache_free) from [<c01c35dc>] (rcu_core+0x390/0xccc)
> [<c01c35dc>] (rcu_core) from [<c01013a8>] (__do_softirq+0x180/0x518)
> [<c01013a8>] (__do_softirq) from [<c0135214>] (irq_exit+0x9c/0xe0)
> [<c0135214>] (irq_exit) from [<c01a40e4>] (__handle_domain_irq+0xb0/0x110)
> [<c01a40e4>] (__handle_domain_irq) from [<c0691248>] (gic_handle_irq+0xa0/0xb8)
> [<c0691248>] (gic_handle_irq) from [<c0100b0c>] (__irq_svc+0x6c/0x94)
> Exception stack(0xc36bb928 to 0xc36bb970)
> b920: c36bb9c0 00000000 c0126919 c0101228 c36bb9c0 b76d7730
> b940: c36b8000 c36bb9a0 c3335b00 c01ce0d8 00000003 c36bba3c c36bb940 c36bb978
> b960: c010e298 c011373c 60000013 ffffffff
> [<c0100b0c>] (__irq_svc) from [<c011373c>] (unwind_frame+0x0/0x870)
> [<c011373c>] (unwind_frame) from [<00000000>] (0x0)
>
> The buggy address belongs to the page:
> page:(ptrval) refcount:0 mapcount:0 mapping:00000000 index:0x0 pfn:0x636bb
> flags: 0x0()
> raw: 00000000 00000000 ef867764 00000000 00000000 00000000 ffffffff 00000000
> page dumped because: kasan: bad access detected
>
> addr c36bba90 is located in stack of task cat/163 at offset 48 in frame:
> stack_trace_save+0x0/0xb4
>
> this frame has 1 object:
> [32, 48) 'trace'
>
> Memory state around the buggy address:
> c36bb980: f1 f1 f1 f1 00 04 f2 f2 00 00 f3 f3 00 00 00 00
> c36bba00: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
> >c36bba80: 00 00 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
> ^
> c36bbb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> c36bbb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ==================================================================
>
> There is a same issue on x86 and has been resolved by the commit f7d27c35ddff
> ("x86/mm, kasan: Silence KASAN warnings in get_wchan()").
> The solution could be applied to arm architecture too.
>
> Signed-off-by: Lin Yujun <linyujun809@huawei.com>
> Reported-by: He Ying <heying24@huawei.com>

Hi,

Please drop this in the patch system if not already done so. Pointer to
it in my signature below. Thanks.

--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

\
 
 \ /
  Last update: 2022-03-30 18:02    [W:0.459 / U:0.320 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site