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Date: Thu, 11 Jun 2020 19:29:33 +0200
From: Mikhail Morfikov <>
Subject: Re: RE: ISRA optimized functions

On 11/06/2020 18:44, Adam Zabrocki wrote:
> Hi,
> On Wed, Jun 10, 2020 at 09:18:44AM +0200, Mikhail Morfikov wrote:
>> I just tested and:
>> # cat /proc/version
>> Linux version 5.7.1-amd64 (morfik@...fikownia) (gcc version 10.1.0 (Debian 10.1.0-3), GNU ld (GNU Binutils for Debian) 2.34) #3 SMP PREEMPT Wed Jun 10 07:21:29 CEST 2020
>> # dkms status
>> lkrg, 0.7+git20200609, 5.7.1-amd64, x86_64: installed
>> # modprobe -v p_lkrg
>> insmod /lib/modules/5.7.1-amd64/updates/dkms/p_lkrg.ko
>> # lsmod
>> Module                  Size  Used by
>> p_lkrg                225280  0
>> In the syslog I have the following messages now:
>> kernel: p_lkrg: loading out-of-tree module taints kernel.
>> kernel: [p_lkrg] Loading LKRG...
>> kernel: [p_lkrg] System does NOT support SMAP. LKRG can't enforce SMAP validation :(
>> kernel: Freezing user space processes ... (elapsed 0.031 seconds) done.
>> kernel: OOM killer disabled.
>> kernel: [p_lkrg] 8/23 UMH paths were whitelisted...
>> kernel: [p_lkrg] [kretprobe] register_kretprobe() for <lookup_fast> failed! [err=-22]
>> kernel: [p_lkrg] Trying to find ISRA name for <lookup_fast>
>> kernel: [p_lkrg] ISRA version not found!
>> kernel: [p_lkrg] LKRG won't enforce pCFI validation on 'lookup_fast'
>> kernel: [p_lkrg] LKRG initialized successfully!
>> kernel: OOM killer enabled.
>> kernel: Restarting tasks ... done.
>> So what to do with this *lookup_fast* ?
> It is not critical hook,  that's why LKRG continue initialization. If you have 
> set log_level=3 then you should see an extra message printing such information.
> However, can you please run the following command and provide the result?
> # cat /proc/kallsyms|grep lookup_fast
> I'm just curious

Here it is:

# cat /proc/kallsyms|grep lookup_fast
ffffffffa16f05d0 t lookup_fast.constprop.0
ffffffffa2202580 t nft_hash_lookup_fast
ffffffffc019a026 t p_pcfi_lookup_fast_entry.cold        [p_lkrg]
ffffffffc01b3520 d p_pcfi_lookup_fast_kretprobe [p_lkrg]
ffffffffc0191db0 t p_pcfi_lookup_fast_ret       [p_lkrg]
ffffffffc0191fa0 t p_install_pcfi_lookup_fast_hook      [p_lkrg]
ffffffffc0191dc0 t p_pcfi_lookup_fast_entry     [p_lkrg]
ffffffffc0191fd0 t p_uninstall_pcfi_lookup_fast_hook    [p_lkrg]
ffffffffc01bad74 b p_pcfi_lookup_fast_kretprobe_state   [p_lkrg]

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