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Message-Id: <010479C3-01C7-425C-92E9-CBD4429AB3B9@gmail.com>
Date: Sun, 16 Dec 2018 20:16:42 +0400
From: Ilya Matveychikov <matvejchikov@...il.com>
To: lkrg-users@...ts.openwall.com
Subject: Re: Ubuntu 18.04 - kzalloc() can't allocate memory
Why not to use vzalloc() (or vmalloc/memset-wrapper) instead?
> On Dec 15, 2018, at 9:27 PM, Adam Zabrocki <pi3@....com.pl> wrote:
>
> Hi,
>
> kzalloc() might fail if you don't have enough memory. Are you trying to run
> LKRG on a VM? If yes you could try to increase allocated memory.
>
> Thanks,
> Adam
>
> On Fri, Dec 14, 2018 at 03:28:46PM -0300, Diego M. Vadell wrote:
>> Hello everyone
>>
>> I compiled lkrg (tried both 0.5 and main) in an ubuntu 18.04 ( kernel
>> 4.15.0-42-generic #45-Ubuntu SMP, gcc version 7.3.0), without errors, but
>> when I insmod any the module I get killed:
>>
>> $ sudo insmod output/p_lkrg.ko
>> Killed
>>
>> And I have this dmesg output:
>>
>> [ 2273.162887] insmod: page allocation failure: order:7, mode:0x108c020(G
>> FP_ATOMIC|__GFP_COMP|__GFP_ZERO), nodemask=(null)
>> [ 2273.162890] insmod cpuset=/ mems_allowed=0
>> [ 2273.162897] CPU: 0 PID: 9212 Comm: insmod Tainted: P W OE 4
>> .15.0-42-generic #45-Ubuntu
>>
>> Dec 14 15:05:30 mordor kernel: [ 2272.156219] [p_lkrg] Loading LKRG...
>> Dec 14 15:05:31 mordor kernel: [ 2272.780685] WARNING: CPU: 0 PID: 9212
>> at /build/linux-Y38gIP/linux-4.15.0/mm/page_alloc.c:3931
>> __alloc_pages_slowpath+0xb73/0xe20
>> Dec 14 15:05:31 mordor kernel: [ 2272.780687] Modules linked in: p_lkrg(OE+)
>> ccm veth rfcomm ebtable_filter ebtables nf_conntrack_netlink nfnetlink
>> xfrm_user xfrm_algo xt_addrtype xt_conntrack br_netfilter xt_comment aufs
>> xt_CHECKSUM ipx p8023 iptable_mangle psnap p8022 ipt_MASQUERADE
>> nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
>> nf_nat_ipv4 nf_nat nf_conntrack libcrc32c xt_tcpudp bridge stp llc
>> iptable_filter overlay bnep nvidia_uvm(POE) snd_hda_codec_hdmi
>> intel_powerclamp coretemp kvm_intel kvm samsung_laptop irqbypass intel_cstate
>> arc4 ath9k ath9k_common ath9k_hw input_leds joydev nvidia(POE) ath serio_raw
>> intel_ips btusb btrtl btbcm btintel mac80211 uvcvideo bluetooth
>> videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core videodev
>> media snd_hda_codec_realtek ecdh_generic snd_seq_midi snd_hda_codec_generic
>> Dec 14 15:05:31 mordor kernel: [ 2272.780740] snd_seq_midi_event
>> snd_hda_intel snd_hda_codec snd_rawmidi snd_hda_core cfg80211 snd_hwdep
>> snd_pcm snd_seq drm snd_seq_device snd_timer snd soundcore shpchp lpc_ich
>> mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4
>> crypto_simd glue_helper cryptd aes_x86_64 algif_skcipher af_alg dm_crypt
>> psmouse ahci libahci i2c_i801 sky2 video [last unloaded: reiserfs]
>> Dec 14 15:05:31 mordor kernel: [ 2272.780773] CPU: 0 PID: 9212 Comm: insmod
>> Tainted: P W OE 4.15.0-42-generic #45-Ubuntu
>> Dec 14 15:05:31 mordor kernel: [ 2272.780775] Hardware name: SAMSUNG
>> ELECTRONICS CO., LTD.
>> R480/R431/R481 /R480/R431/R481 , BIOS
>> 11SZ.M001.20100807.XW 08/07/2010
>> Dec 14 15:05:31 mordor kernel: [ 2272.780778] RIP:
>> 0010:__alloc_pages_slowpath+0xb73/0xe20
>> Dec 14 15:05:31 mordor kernel: [ 2272.780779] RSP: 0018:ffffaf5c837eb978
>> EFLAGS: 00010246
>> Dec 14 15:05:31 mordor kernel: [ 2272.780781] RAX: 0000000000000000 RBX:
>> 000000000108c020 RCX: 0000000000000000
>> Dec 14 15:05:31 mordor kernel: [ 2272.780782] RDX: ffffaf5c837eba80 RSI:
>> 0000000000000000 RDI: 0000000000000000
>> Dec 14 15:05:31 mordor kernel: [ 2272.780784] RBP: ffffaf5c837eba70 R08:
>> 0000000000000000 R09: 0000000000000787
>> Dec 14 15:05:31 mordor kernel: [ 2272.780785] R10: 0000000000000002 R11:
>> 0000000000000000 R12: 000000000000000b
>> Dec 14 15:05:31 mordor kernel: [ 2272.780786] R13: 0000000000000000 R14:
>> 000000000108c020 R15: 0000000000000000
>> Dec 14 15:05:31 mordor kernel: [ 2272.780788] FS: 00007ff45c4f5540(0000)
>> GS:ffff8ed15fc00000(0000) knlGS:0000000000000000
>> Dec 14 15:05:31 mordor kernel: [ 2272.780790] CS: 0010 DS: 0000 ES: 0000 CR0:
>> 0000000080050033
>> Dec 14 15:05:31 mordor kernel: [ 2272.780791] CR2: 000055ff77089e38 CR3:
>> 0000000054986001 CR4: 00000000000206f0
>> Dec 14 15:05:31 mordor kernel: [ 2272.780793] Call Trace:
>> Dec 14 15:05:31 mordor kernel: [ 2272.780801]
>> __alloc_pages_nodemask+0x263/0x280
>> Dec 14 15:05:31 mordor kernel: [ 2272.780807] alloc_pages_current+0x6a/0xe0
>> Dec 14 15:05:31 mordor kernel: [ 2272.780812] kmalloc_order+0x18/0x40
>> Dec 14 15:05:31 mordor kernel: [ 2272.780814] kmalloc_order_trace+0x24/0xb0
>> Dec 14 15:05:31 mordor kernel: [ 2272.780817] __kmalloc+0x209/0x220
>> Dec 14 15:05:31 mordor kernel: [ 2272.780828] ?
>> p_list_from_module_list+0x21f/0x4c0 [p_lkrg]
>> Dec 14 15:05:31 mordor kernel: [ 2272.780835]
>> p_list_from_module_list+0x1ff/0x4c0 [p_lkrg]
>> Dec 14 15:05:31 mordor kernel: [ 2272.780837] ? __kmalloc+0x1b0/0x220
>> Dec 14 15:05:31 mordor kernel: [ 2272.780843] p_kmod_hash+0x2f6/0x5a0
>> [p_lkrg]
>> Dec 14 15:05:31 mordor kernel: [ 2272.780850] p_create_database+0x1e5/0x420
>> [p_lkrg]
>> Dec 14 15:05:31 mordor kernel: [ 2272.780853] ? 0xffffffffc16a2000
>> Dec 14 15:05:31 mordor kernel: [ 2272.780860] p_lkrg_register+0xec/0x1000
>> [p_lkrg]
>> Dec 14 15:05:31 mordor kernel: [ 2272.780865] do_one_initcall+0x52/0x19f
>> Dec 14 15:05:31 mordor kernel: [ 2272.780868] ? _cond_resched+0x19/0x40
>> Dec 14 15:05:31 mordor kernel: [ 2272.780870] ?
>> kmem_cache_alloc_trace+0x14e/0x1b0
>> Dec 14 15:05:31 mordor kernel: [ 2272.780874] ? do_init_module+0x27/0x209
>> Dec 14 15:05:31 mordor kernel: [ 2272.780876] do_init_module+0x5f/0x209
>> Dec 14 15:05:31 mordor kernel: [ 2272.780878] load_module+0x191e/0x1f10
>> Dec 14 15:05:31 mordor kernel: [ 2272.780883] ? ima_post_read_file+0x96/0xa0
>> Dec 14 15:05:31 mordor kernel: [ 2272.780886] SYSC_finit_module+0xfc/0x120
>> Dec 14 15:05:31 mordor kernel: [ 2272.780888] ? SYSC_finit_module+0xfc/0x120
>> Dec 14 15:05:31 mordor kernel: [ 2272.780891] SyS_finit_module+0xe/0x10
>> Dec 14 15:05:31 mordor kernel: [ 2272.780894] do_syscall_64+0x73/0x130
>> Dec 14 15:05:31 mordor kernel: [ 2272.780897]
>> entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>> Dec 14 15:05:31 mordor kernel: [ 2272.780899] RIP: 0033:0x7ff45c027839
>> Dec 14 15:05:31 mordor kernel: [ 2272.780900] RSP: 002b:00007ffe1e88fb98
>> EFLAGS: 00000246 ORIG_RAX: 0000000000000139
>> Dec 14 15:05:31 mordor kernel: [ 2272.780902] RAX: ffffffffffffffda RBX:
>> 000055ff77086780 RCX: 00007ff45c027839
>> Dec 14 15:05:31 mordor kernel: [ 2272.780904] RDX: 0000000000000000 RSI:
>> 000055ff75049d2e RDI: 0000000000000003
>> Dec 14 15:05:31 mordor kernel: [ 2272.780905] RBP: 000055ff75049d2e R08:
>> 0000000000000000 R09: 00007ff45c2fa000
>> Dec 14 15:05:31 mordor kernel: [ 2272.780906] R10: 0000000000000003 R11:
>> 0000000000000246 R12: 0000000000000000
>> Dec 14 15:05:31 mordor kernel: [ 2272.780907] R13: 000055ff77088e30 R14:
>> 0000000000000000 R15: 0000000000000000
>> Dec 14 15:05:31 mordor kernel: [ 2272.780909] Code: 85 c0 0f 85 fc fd ff ff e9
>> 1e fd ff ff 0f 0b 89 f8 c7 85 20 ff ff ff 00 00 00 00 25 ff ff f7 ff 89 85 68
>> ff ff ff e9 12 f5 ff ff <0f> 0b e9 c1 f4 ff ff 8b 5d 88 44 8b b5 68 ff ff ff
>> 4c 8d 4d 94
>> Dec 14 15:05:31 mordor kernel: [ 2272.780946] ---[ end trace
>> ccd206a6fa856626 ]---
>>
>> And then a lot of lines like this:
>>
>> Dec 14 15:05:31 mordor kernel: [ 2272.780948] [p_lkrg] KMOD HASH kzalloc()
>> error! Can't allocate memory for module list ;[
>> Dec 14 15:05:31 mordor kernel: [ 2272.780953] [p_lkrg] KMOD HASH error! Can't
>> allocate memory during dumping modules from module list ;[
>>
>> And then, again, insmod: page allocation failure, a Call Trace, and multiple
>> KMOD_HASH errors.
>>
>> Does anybody knows why kzalloc() can't allocate memory?
>>
>> Cheers,
>> -- Diego.
>>
>>
>>
>>
>
> --
> pi3 (pi3ki31ny) - pi3 (at) itsec pl
> http://pi3.com.pl
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