use after free 引起KE

最新推荐文章于 2023-03-30 00:30:22 发布

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Jarry_le

最新推荐文章于 2023-03-30 00:30:22 发布

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本文链接：https://blog.youkuaiyun.com/u011677209/article/details/52798998

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问题背景：

待机状态下，按Power键或者自动进入休眠，必现KE。

分析过程：

取出mtklog看到有db产生，确实发生了KE（kernel exception），取出db和vmlinux (必须是和当前软件是同一次编译的)后，使用GAT工具解开db，取出SYS_MINI_RDUMP，使用 gdb调试：

$ arm-linux-androideabi-gdb vmlinux SYS_MINI_RDUMP
GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-linux-gnu --target=arm-linux-android".
For bug reporting instructions, please see:
<http://source.android.com/source/report-bugs.html>...
Reading symbols from KE/vmlinux...done.
[New LWP 103]
[New LWP 1]
[New LWP 2]
[New LWP 3]
[New LWP 4]
[New LWP 5]
[New LWP 6]
[New LWP 7]
[New LWP 8]
Core was generated by `console=tty0 console=ttyMT0,921600n1 root=/dev/ram vmalloc=496M slub_max_order='.
#0 0xd9027400 in ?? ()
(gdb) bt
#0 0xd9027400 in ?? ()
#1 0xc00985c0 in early_suspend (work=<optimized out>) at kernel-3.10/kernel/power/earlysuspend.c:144