Additional info: reporter: libreport-2.13.1 General protection fault in user access. Non-canonical address? WARNING: CPU: 15 PID: 423041 at arch/x86/mm/extable.c:77 ex_handler_uaccess+0x4d/0x60 Modules linked in: xt_multiport xt_nat xt_addrtype xt_mark vhost_net vhost tap vhost_iotlb ip6t_REJECT xt_CHECKSUM xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp xt_MASQUERADE xt_comment veth bridge stp llc tun squashfs loop cfg80211 binfmt_misc overlay snd_seq_dummy snd_hrtimer uinput nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_mangle iptable_raw iptable_security ip_set nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter sunrpc vfat fat snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg edac_mce_amd snd_usb_audio snd_hda_codec uvcvideo videobuf2_vmalloc snd_usbmidi_lib snd_hda_core kvm_amd videobuf2_memops snd_rawmidi videobuf2_v4l2 snd_hwdep videobuf2_common snd_seq kvm snd_seq_device videodev snd_pcm eeepc_wmi ses asus_wmi enclosure sparse_keymap snd_timer mc rfkill scsi_transport_sas sp5100_tco irqbypass wmi_bmof video pcspkr snd joydev i2c_piix4 k10temp soundcore acpi_cpufreq zram ip_tables amdgpu amd_iommu_v2 gpu_sched i2c_algo_bit uas ttm usb_storage drm_kms_helper drm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ccp nvme r8169 nvme_core wmi pinctrl_amd fuse CPU: 15 PID: 423041 Comm: bun Not tainted 5.7.11-200.fc32.x86_64 #1 Hardware name: System manufacturer System Product Name/TUF GAMING X570-PLUS, BIOS 2407 07/01/2020 RIP: 0010:ex_handler_uaccess+0x4d/0x60 Code: 83 c4 08 b8 01 00 00 00 5b c3 80 3d 00 c8 99 01 00 75 dc 48 c7 c7 80 f0 35 a3 48 89 34 24 c6 05 ec c7 99 01 01 e8 6a 85 06 00 <0f> 0b 48 8b 34 24 eb bd 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 RSP: 0018:ffffa46f45dffbc0 EFLAGS: 00010282 RAX: 000000000000003f RBX: ffffffffa34d19e8 RCX: 0000000000000000 RDX: 0000000000000007 RSI: ffffffffa418a3df RDI: 0000000000000246 RBP: ffffa46f45dffc98 R08: 000715ee411995f5 R09: 000000000000003f R10: 0000000000067481 R11: 0000000000000001 R12: 0000000000000000 R13: 000000000000000d R14: 0000000000000000 R15: 0000000000000000 FS: 00007f2bb4e3ec00(0000) GS:ffff92122edc0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000021 CR3: 00000008b7e02000 CR4: 0000000000340ee0 Call Trace: fixup_exception+0x45/0x58 do_general_protection+0xda/0x2c0 general_protection+0x32/0x40 RIP: 0010:__strncpy_from_unsafe+0x5f/0xb0 Code: 00 00 01 45 31 c9 48 89 f2 eb 0f 84 c9 74 2e 48 89 d0 48 29 f0 4c 39 c0 7d 4f 48 89 d1 48 83 c2 01 0f 01 cb 0f ae e8 44 89 c8 <8a> 09 0f 01 ca 48 98 48 83 c7 01 88 4f ff 48 85 c0 74 ce c6 47 ff RSP: 0018:ffffa46f45dffd40 EFLAGS: 00050202 RAX: 0000000000000000 RBX: ffffa46f45dffe08 RCX: 63746f672d6c6661 RDX: 63746f672d6c6662 RSI: 63746f672d6c6661 RDI: ffffc46f371c9ce0 RBP: ffffc46f371c9ce0 R08: 0000000000000400 R09: 0000000000000000 R10: 00007ffffffff000 R11: 0000000000000f07 R12: 0000000000000400 R13: 63746f672d6c6661 R14: 0000000000acc9b0 R15: ffffa46f45dffdb0 bpf_probe_read_compat_str+0x2e/0x60 bpf_prog_7809408b9b4b841f_sys_enter_execv+0x1d9/0xdd8 trace_call_bpf+0x7a/0xf0 perf_call_bpf_enter.isra.0+0x39/0x40 ? perf_trace_buf_alloc+0x1a/0x90 perf_syscall_enter+0x16b/0x1d0 syscall_trace_enter+0x27a/0x290 ? do_user_addr_fault+0x219/0x490 do_syscall_64+0xe4/0xf0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f2bb4f0e3eb Code: 48 3d 00 f0 ff ff 76 e7 f7 d8 64 41 89 00 eb df 0f 1f 80 00 00 00 00 f7 d8 64 41 89 00 eb dc f3 0f 1e fa b8 3b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 7d 4a 0f 00 f7 d8 64 89 01 48 RSP: 002b:00007ffee46d7ee8 EFLAGS: 00000257 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 0000000000acc9f0 RCX: 00007f2bb4f0e3eb RDX: 00007ffee46d8568 RSI: 0000000000acc9b0 RDI: 00007ffee46d7ef0 RBP: 00007ffee46d7ff0 R08: 0000000000000fff R09: 00007ffee46d9835 R10: 0000000000476669 R11: 0000000000000257 R12: 0000000000acc9b0 R13: 00007ffee46d8568 R14: 000000000000000b R15: 00007ffee46d9815
Created attachment 1715801 [details] File: dmesg
The 'bun' command is from here (it runs afl-fuzz): https://github.com/yomimono/ocaml-bun The BPF in question is likely /usr/share/bpftrace/tools/execsnoop.bt I don't have a repro, but perhaps `bun` itself has quit by the time the BPF tried to read the execve argument? (bun launches multiple afl-fuzz instances, but kills all its threads as soon as 1 afl-fuzz thread finds a crash, which sometimes happens within seconds, depending what you fuzz)
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