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Date: Wed, 23 Mar 2022 12:54:05 -0700 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Kumar Kartikeya Dwivedi <memxor@...il.com> Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, LKML <linux-kernel@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, syzkaller-bugs <syzkaller-bugs@...glegroups.com> Subject: Re: [syzbot] bpf-next boot error: KASAN: null-ptr-deref Write in register_btf_kfunc_id_set Kumar, please take a look. Thanks! On Wed, Mar 23, 2022 at 12:14 PM syzbot <syzbot+12babd2d45fac8bfff7d@...kaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: a8fee96202e2 libbpf: Avoid NULL deref when initializing ma.. > git tree: bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1686180b700000 > kernel config: https://syzkaller.appspot.com/x/.config?x=820db791969fe863 > dashboard link: https://syzkaller.appspot.com/bug?extid=12babd2d45fac8bfff7d > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+12babd2d45fac8bfff7d@...kaller.appspotmail.com > > usbcore: registered new interface driver snd-usb-audio > usbcore: registered new interface driver snd-ua101 > usbcore: registered new interface driver snd-usb-usx2y > usbcore: registered new interface driver snd-usb-us122l > usbcore: registered new interface driver snd-usb-caiaq > usbcore: registered new interface driver snd-usb-6fire > usbcore: registered new interface driver snd-usb-hiface > usbcore: registered new interface driver snd-bcd2000 > usbcore: registered new interface driver snd_usb_pod > usbcore: registered new interface driver snd_usb_podhd > usbcore: registered new interface driver snd_usb_toneport > usbcore: registered new interface driver snd_usb_variax > drop_monitor: Initializing network drop monitor service > NET: Registered PF_LLC protocol family > GACT probability on > Mirror/redirect action on > Simple TC action Loaded > netem: version 1.3 > u32 classifier > Performance counters on > input device check on > Actions configured > nf_conntrack_irc: failed to register helpers > nf_conntrack_sane: failed to register helpers > nf_conntrack_sip: failed to register helpers > xt_time: kernel timezone is -0000 > IPVS: Registered protocols (TCP, UDP, SCTP, AH, ESP) > IPVS: Connection hash table configured (size=4096, memory=64Kbytes) > IPVS: ipvs loaded. > IPVS: [rr] scheduler registered. > IPVS: [wrr] scheduler registered. > IPVS: [lc] scheduler registered. > IPVS: [wlc] scheduler registered. > IPVS: [fo] scheduler registered. > IPVS: [ovf] scheduler registered. > IPVS: [lblc] scheduler registered. > IPVS: [lblcr] scheduler registered. > IPVS: [dh] scheduler registered. > IPVS: [sh] scheduler registered. > IPVS: [mh] scheduler registered. > IPVS: [sed] scheduler registered. > IPVS: [nq] scheduler registered. > IPVS: [twos] scheduler registered. > IPVS: [sip] pe registered. > ipip: IPv4 and MPLS over IPv4 tunneling driver > gre: GRE over IPv4 demultiplexor driver > ip_gre: GRE over IPv4 tunneling driver > IPv4 over IPsec tunneling driver > ipt_CLUSTERIP: ClusterIP Version 0.8 loaded successfully > ================================================================== > BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] > BUG: KASAN: null-ptr-deref in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] > BUG: KASAN: null-ptr-deref in __refcount_add include/linux/refcount.h:193 [inline] > BUG: KASAN: null-ptr-deref in __refcount_inc include/linux/refcount.h:250 [inline] > BUG: KASAN: null-ptr-deref in refcount_inc include/linux/refcount.h:267 [inline] > BUG: KASAN: null-ptr-deref in btf_get kernel/bpf/btf.c:1636 [inline] > BUG: KASAN: null-ptr-deref in btf_get_module_btf kernel/bpf/btf.c:6588 [inline] > BUG: KASAN: null-ptr-deref in register_btf_kfunc_id_set+0x99/0x8b0 kernel/bpf/btf.c:6812 > Write of size 4 at addr 0000000000000054 by task swapper/0/1 > > CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.17.0-rc6-syzkaller-02045-ga8fee96202e2 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 > __kasan_report mm/kasan/report.c:446 [inline] > kasan_report.cold+0x66/0xdf mm/kasan/report.c:459 > check_region_inline mm/kasan/generic.c:183 [inline] > kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 > instrument_atomic_read_write include/linux/instrumented.h:101 [inline] > atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] > __refcount_add include/linux/refcount.h:193 [inline] > __refcount_inc include/linux/refcount.h:250 [inline] > refcount_inc include/linux/refcount.h:267 [inline] > btf_get kernel/bpf/btf.c:1636 [inline] > btf_get_module_btf kernel/bpf/btf.c:6588 [inline] > register_btf_kfunc_id_set+0x99/0x8b0 kernel/bpf/btf.c:6812 > bbr_register+0x18/0x48 net/ipv4/tcp_bbr.c:1183 > do_one_initcall+0x103/0x650 init/main.c:1302 > do_initcall_level init/main.c:1375 [inline] > do_initcalls init/main.c:1391 [inline] > do_basic_setup init/main.c:1410 [inline] > kernel_init_freeable+0x6b1/0x73a init/main.c:1615 > kernel_init+0x1a/0x1d0 init/main.c:1504 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > </TASK> > ================================================================== > Kernel panic - not syncing: panic_on_warn set ... > CPU: 0 PID: 1 Comm: swapper/0 Tainted: G B 5.17.0-rc6-syzkaller-02045-ga8fee96202e2 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 > panic+0x2b0/0x6dd kernel/panic.c:233 > end_report.cold+0x63/0x6f mm/kasan/report.c:128 > __kasan_report mm/kasan/report.c:449 [inline] > kasan_report.cold+0x71/0xdf mm/kasan/report.c:459 > check_region_inline mm/kasan/generic.c:183 [inline] > kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 > instrument_atomic_read_write include/linux/instrumented.h:101 [inline] > atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] > __refcount_add include/linux/refcount.h:193 [inline] > __refcount_inc include/linux/refcount.h:250 [inline] > refcount_inc include/linux/refcount.h:267 [inline] > btf_get kernel/bpf/btf.c:1636 [inline] > btf_get_module_btf kernel/bpf/btf.c:6588 [inline] > register_btf_kfunc_id_set+0x99/0x8b0 kernel/bpf/btf.c:6812 > bbr_register+0x18/0x48 net/ipv4/tcp_bbr.c:1183 > do_one_initcall+0x103/0x650 init/main.c:1302 > do_initcall_level init/main.c:1375 [inline] > do_initcalls init/main.c:1391 [inline] > do_basic_setup init/main.c:1410 [inline] > kernel_init_freeable+0x6b1/0x73a init/main.c:1615 > kernel_init+0x1a/0x1d0 init/main.c:1504 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > </TASK> > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@...glegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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