Re: [PATCH] arm64: kprobe: Enable OPTPROBE for arm64
From: liuqi (BA) <hidden>
Date: 2021-08-02 12:02:53
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On 2021/8/2 11:52, liuqi (BA) wrote: [...]
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This might be the direction to go later. Anyway, "Rome wasn't built in a day", for this stage, we might focus on optprobe for the case of non-randomized module region :-). BTW, @liuqi, if users set "nokaslr" in bootargs, will your optprobe always work and not fall back to normal kprobe even we remove the dependency on RANDOMIZED_MODULE_REGION_FULL?Hi Barry, I do some tests on Hip08 platform, using nokaslr in booting cmdline and remove dependency on RANDOMIZED_MODULE_REGION_FULL, optprobe seems work. Here is the log: estuary:/$ uname -a Linux (none) 5.13.0-rc4+ #37 SMP PREEMPT Mon Aug 2 08:13:37 CST 2021 aarch64 GNU/Linux estuary:/$ zcat /proc/config.gz | grep RANDOMIZE_MODULE_REGION CONFIG_RANDOMIZE_MODULE_REGION_FULL=y estuary:/$ zcat /proc/config.gz | grep OPTPROBE CONFIG_OPTPROBES=y CONFIG_HAVE_OPTPROBES=y estuary:/$ cat /proc/cmdline console=ttyAMA0,115200 earlycon=pl011,0x9000000 kpti=off nokaslr estuary:/$ cat /sys/bus/platform/devices/hello_driver/kprobe_test [ 61.304143] do_empty returned 0 and took 200 ns to execute [ 61.304662] do_empty returned 0 and took 110 ns to execute [ 61.305196] do_empty returned 0 and took 100 ns to execute [ 61.305745] do_empty returned 0 and took 90 ns to execute [ 61.306262] do_empty returned 0 and took 90 ns to execute [ 61.306781] do_empty returned 0 and took 90 ns to execute [ 61.307286] do_empty returned 0 and took 90 ns to execute [ 61.307798] do_empty returned 0 and took 90 ns to execute [ 61.308314] do_empty returned 0 and took 90 ns to execute [ 61.308828] do_empty returned 0 and took 90 ns to execute [ 61.309323] do_empty returned 0 and took 80 ns to execute [ 61.309832] do_empty returned 0 and took 80 ns to execute [ 61.310357] do_empty returned 0 and took 80 ns to execute [ 61.310871] do_empty returned 0 and took 80 ns to execute [ 61.311361] do_empty returned 0 and took 80 ns to execute [ 61.311851] do_empty returned 0 and took 90 ns to execute [ 61.312358] do_empty returned 0 and took 90 ns to execute [ 61.312879] do_empty returned 0 and took 80 ns to execute Thanks, Qi
Hi Barry, I've done test on Hip08 platform using nokaslr in booting cmdline and remove dependency on RANDOMIZED_MODULE_REGION_FULL, on following 4 cases: 1. probed code in module, pre_handler in kernel. 2. probed code in kernel, pre_handler in kernel. 3. probed code in module, pre_handler in module. 4. probed code in kernel, pre_handler in module. and optprobe works in these 4 cases. Thanks, Qi
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Thank you, -- Masami Hiramatsu [off-list ref]Thanks Barry ..
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