ARM汇编实战1：内核函数netlink_lookup_internal error: oops: 807 [#1] preempt smp arm-优快云博客

本文链接：https://blog.youkuaiyun.com/myxmu/article/details/13629481

这篇博客详细记录了一次ARM架构下内核函数netlink_lookup引发的异常情况。从堆栈信息中，可以看到异常发生在netlink_unicast、netlink_sendmsg等网络相关函数调用过程中。通过源代码分析，netlink_lookup函数用于查找指定协议和PID的套接字。反汇编代码展示了函数执行的具体步骤，包括哈希查找和锁操作。通过对异常细节的深入探讨，有助于理解内核网络子系统的运行机制。

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堆栈信息

Exception Class: Kernel (KE)
Current Executing Process:
[wpa_supplicant, 687][logwrapper, 686]
Backtrace:
[<c0327a40>] emmc_ipanic+0x4c/0x46c
[<c0068a8c>] notifier_call_chain+0x64/0xdc
[<c0068d34>] __atomic_notifier_call_chain+0x40/0x54
[<c0068d68>] atomic_notifier_call_chain+0x20/0x28
[<c0568654>] panic+0x7c/0x194
[<c00121e4>] die+0x120/0x2a0
[<c0568328>] __do_kernel_fault.part.9+0x5c/0x7c
[<c00157f8>] do_page_fault+0x23c/0x278
[<c0015960>] do_translation_fault+0xa0/0xa8
[<c00083c0>] do_DataAbort+0x7c/0x100
[<c000df58>] __dabt_svc+0x38/0x60
[<c045cab0>] netlink_unicast+0xac/0x204
[<c045cf70>] netlink_sendmsg+0x2c0/0x324
[<c0421318>] sock_sendmsg+0xac/0xcc
[<c04216c4>] __sys_sendmsg+0x2d4/0x2ec
[<c042314c>] sys_sendmsg+0x44/0x70
[<c000e500>] ret_fast_syscall+0x0/0x30
[<ffffffff>] 0xffffffff

Exception Detail Info:
<0>[ 1386.071540] (1)[687:wpa_supplicant]Internal error: Oops: 5 [#1] PREEMPT SMP ARM
<4>[ 1386.071553] (1)[687:wpa_supplicant]Modules linked in: wlan_mt bf1c3000 lowmemorydetect bf1bf000 ccci bf194000 ccci_plat bf165000 mtk_wmt_wifi bf161000 mtk_fm_drv bf136000 mtk_stp_bt bf129000 mtk_stp_gps bf11c000 mtk_stp_wmt bf091000 devinfo bf08d000 devapc bf088000 sec bf061000 vcodec_kernel_driver bf052000 bma2xx bf047000 mali bf000000
<4>[ 1386.071644] (1)[687:wpa_supplicant]CPU: 1 Tainted: G W (3.4.5 #1)
<4>[ 1386.071660] (1)[687:wpa_supplicant]PC is at netlink_lookup.isra.17+0x38/0x10c
<4>[ 1386.071676] (1)[687:wpa_supplicant]LR is at __raw_read_lock+0x24/0xa0
<4>[ 1386.071691] (1)[687:wpa_supplicant]pc : [<c045b7c0>] lr : [<c0571280>] psr: 60000013
<4>[ 1386.071699] (1)[687:wpa_supplicant]sp : dc99fcb0 ip : dc99fc88 fp : dc99fccc
<4>[ 1386.071714] (1)[687:wpa_supplicant]r10: 00000000 r9 : 00000028 r8 : 00000000
<4>[ 1386.071728] (1)[687:wpa_supplicant]r7 : dc99fcd4 r6 : 84000143 r5 : 00000380 r4 : 00000000
<4>[ 1386.071742] (1)[687:wpa_supplicant]r3 : 00000855 r2 : 0000beef r1 : deadbeef r0 : 840004c3
<4>[