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| author | Rong Tao <rongtao@cestc.cn> | 2023-04-16 17:05:17 +0200 |
|---|---|---|
| committer | Luis Chamberlain <mcgrof@kernel.org> | 2023-07-24 21:15:29 +0200 |
| commit | 910e230d5f1bb72c54532e94fbb1705095c7bab6 (patch) | |
| tree | 8b859d9f6b1ef2576c4741509fb70517c13419bf | |
| parent | modpost, kallsyms: Treat add '$'-prefixed symbols as mapping symbols (diff) | |
| download | linux-910e230d5f1bb72c54532e94fbb1705095c7bab6.tar.xz linux-910e230d5f1bb72c54532e94fbb1705095c7bab6.zip | |
samples/hw_breakpoint: Fix kernel BUG 'invalid opcode: 0000'
Macro symbol_put() is defined as __symbol_put(__stringify(x))
ksym_name = "jiffies"
symbol_put(ksym_name)
will be resolved as
__symbol_put("ksym_name")
which is clearly wrong. So symbol_put must be replaced with __symbol_put.
When we uninstall hw_breakpoint.ko (rmmod), a kernel bug occurs with the
following error:
[11381.854152] kernel BUG at kernel/module/main.c:779!
[11381.854159] invalid opcode: 0000 [#2] PREEMPT SMP PTI
[11381.854163] CPU: 8 PID: 59623 Comm: rmmod Tainted: G D OE 6.2.9-200.fc37.x86_64 #1
[11381.854167] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./B360M-HDV, BIOS P3.20 10/23/2018
[11381.854169] RIP: 0010:__symbol_put+0xa2/0xb0
[11381.854175] Code: 00 e8 92 d2 f7 ff 65 8b 05 c3 2f e6 78 85 c0 74 1b 48 8b 44 24 30 65 48 2b 04 25 28 00 00 00 75 12 48 83 c4 38 c3 cc cc cc cc <0f> 0b 0f 1f 44 00 00 eb de e8 c0 df d8 00 90 90 90 90 90 90 90 90
[11381.854178] RSP: 0018:ffffad8ec6ae7dd0 EFLAGS: 00010246
[11381.854181] RAX: 0000000000000000 RBX: ffffffffc1fd1240 RCX: 000000000000000c
[11381.854184] RDX: 000000000000006b RSI: ffffffffc02bf7c7 RDI: ffffffffc1fd001c
[11381.854186] RBP: 000055a38b76e7c8 R08: ffffffff871ccfe0 R09: 0000000000000000
[11381.854188] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[11381.854190] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[11381.854192] FS: 00007fbf7c62c740(0000) GS:ffff8c5badc00000(0000) knlGS:0000000000000000
[11381.854195] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[11381.854197] CR2: 000055a38b7793f8 CR3: 0000000363e1e001 CR4: 00000000003726e0
[11381.854200] DR0: ffffffffb3407980 DR1: 0000000000000000 DR2: 0000000000000000
[11381.854202] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[11381.854204] Call Trace:
[11381.854207] <TASK>
[11381.854212] s_module_exit+0xc/0xff0 [symbol_getput]
[11381.854219] __do_sys_delete_module.constprop.0+0x198/0x2f0
[11381.854225] do_syscall_64+0x58/0x80
[11381.854231] ? exit_to_user_mode_prepare+0x180/0x1f0
[11381.854237] ? syscall_exit_to_user_mode+0x17/0x40
[11381.854241] ? do_syscall_64+0x67/0x80
[11381.854245] ? syscall_exit_to_user_mode+0x17/0x40
[11381.854248] ? do_syscall_64+0x67/0x80
[11381.854252] ? exc_page_fault+0x70/0x170
[11381.854256] entry_SYSCALL_64_after_hwframe+0x72/0xdc
Signed-off-by: Rong Tao <rongtao@cestc.cn>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
| -rw-r--r-- | samples/hw_breakpoint/data_breakpoint.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/hw_breakpoint/data_breakpoint.c b/samples/hw_breakpoint/data_breakpoint.c index 418c46fe5ffc..9debd128b2ab 100644 --- a/samples/hw_breakpoint/data_breakpoint.c +++ b/samples/hw_breakpoint/data_breakpoint.c @@ -70,7 +70,7 @@ fail: static void __exit hw_break_module_exit(void) { unregister_wide_hw_breakpoint(sample_hbp); - symbol_put(ksym_name); + __symbol_put(ksym_name); printk(KERN_INFO "HW Breakpoint for %s write uninstalled\n", ksym_name); } |