Date: Fri, 22 Mar 2024 03:42:02 -0700
From: syzbot <syzbot+33f4297b5f927648741a@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bpf?] UBSAN: array-index-out-of-bounds in check_stack_range_initialized

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

ly
[   13.243082][    T1] X25: Linux Version 0.2
[   13.292064][    T1] NET: Registered PF_NETROM protocol family
[   13.343313][    T1] NET: Registered PF_ROSE protocol family
[   13.349296][    T1] NET: Registered PF_AX25 protocol family
[   13.355995][    T1] can: controller area network core
[   13.361609][    T1] NET: Registered PF_CAN protocol family
[   13.367325][    T1] can: raw protocol
[   13.371880][    T1] can: broadcast manager protocol
[   13.376970][    T1] can: netlink gateway - max_hops=1
[   13.382696][    T1] can: SAE J1939
[   13.386246][    T1] can: isotp protocol (max_pdu_size 8300)
[   13.392393][    T1] Bluetooth: RFCOMM TTY layer initialized
[   13.398148][    T1] Bluetooth: RFCOMM socket layer initialized
[   13.405038][    T1] Bluetooth: RFCOMM ver 1.11
[   13.409743][    T1] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   13.415895][    T1] Bluetooth: BNEP filters: protocol multicast
[   13.422062][    T1] Bluetooth: BNEP socket layer initialized
[   13.427913][    T1] Bluetooth: CMTP (CAPI Emulation) ver 1.0
[   13.433798][    T1] Bluetooth: CMTP socket layer initialized
[   13.439683][    T1] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[   13.446589][    T1] Bluetooth: HIDP socket layer initialized
[   13.455663][    T1] NET: Registered PF_RXRPC protocol family
[   13.461694][    T1] Key type rxrpc registered
[   13.466180][    T1] Key type rxrpc_s registered
[   13.471908][    T1] NET: Registered PF_KCM protocol family
[   13.478501][    T1] lec:lane_module_init: lec.c: initialized
[   13.484387][    T1] mpoa:atm_mpoa_init: mpc.c: initialized
[   13.490222][    T1] l2tp_core: L2TP core driver, V2.0
[   13.495433][    T1] l2tp_ppp: PPPoL2TP kernel driver, V2.0
[   13.501085][    T1] l2tp_ip: L2TP IP encapsulation support (L2TPv3)
[   13.507588][    T1] l2tp_netlink: L2TP netlink interface
[   13.513727][    T1] l2tp_eth: L2TP ethernet pseudowire support (L2TPv3)
[   13.520521][    T1] l2tp_ip6: L2TP IP encapsulation support for IPv6 (L2TPv3)
[   13.528163][    T1] NET: Registered PF_PHONET protocol family
[   13.534342][    T1] 8021q: 802.1Q VLAN Support v1.8
[   13.553054][    T1] DCCP: Activated CCID 2 (TCP-like)
[   13.558374][    T1] DCCP: Activated CCID 3 (TCP-Friendly Rate Control)
[   13.565874][    T1] DCCP is deprecated and scheduled to be removed in 2025, please contact the netdev mailing list
[   13.577035][    T1] sctp: Hash tables configured (bind 32/56)
[   13.584677][    T1] NET: Registered PF_RDS protocol family
[   13.591398][    T1] Registered RDS/infiniband transport
[   13.597871][    T1] Registered RDS/tcp transport
[   13.602694][    T1] tipc: Activated (version 2.0.0)
[   13.608498][    T1] NET: Registered PF_TIPC protocol family
[   13.615258][    T1] tipc: Started in single node mode
[   13.621255][    T1] NET: Registered PF_SMC protocol family
[   13.627139][    T1] 9pnet: Installing 9P2000 support
[   13.633262][    T1] NET: Registered PF_CAIF protocol family
[   13.643520][    T1] NET: Registered PF_IEEE802154 protocol family
[   13.650024][    T1] Key type dns_resolver registered
[   13.655322][    T1] Key type ceph registered
[   13.660315][    T1] libceph: loaded (mon/osd proto 15/24)
[   13.667023][    T1] batman_adv: B.A.T.M.A.N. advanced 2024.1 (compatibility version 15) loaded
[   13.676163][    T1] openvswitch: Open vSwitch switching datapath
[   13.685504][    T1] NET: Registered PF_VSOCK protocol family
[   13.692734][    T1] mpls_gso: MPLS GSO support
[   13.713085][    T1] IPI shorthand broadcast: enabled
[   13.718324][    T1] AVX2 version of gcm_enc/dec engaged.
[   13.724817][    T1] AES CTR mode by8 optimization enabled
[   15.093071][    T1] sched_clock: Marking stable (15050030128, 39570184)->(15098082991, -8482679)
[   15.103483][    T1] Timer migration: 1 hierarchy levels; 8 children per group; 0 crossnode level
[   15.113749][    T1] registered taskstats version 1
[   15.123705][    T1] meta:ffffc90000066170, maptr:0000000000000000, check_helper_call
[   15.132660][    T1] general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI
[   15.144894][    T1] KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
[   15.153438][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-syzkaller-05232-gddb2ffdc474a-dirty #0
[   15.163497][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
[   15.173648][    T1] RIP: 0010:check_helper_call+0x14ec/0x7620
[   15.179554][    T1] Code: 8d bc 24 70 01 00 00 e8 62 f7 4c 00 4c 8b a4 24 70 01 00 00 49 8d 7c 24 1c 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 67 17 00 00 41 8b 5c 24 1c 49 8d 7c 24 20
[   15.199330][    T1] RSP: 0000:ffffc90000066000 EFLAGS: 00010207
[   15.205657][    T1] RAX: 0000000000000003 RBX: 0000000000008004 RCX: dffffc0000000000
[   15.213721][    T1] RDX: ffff8880162d0000 RSI: 0000000000008004 RDI: 000000000000001c
[   15.221695][    T1] RBP: ffffc90000066250 R08: ffffffff81ab43c7 R09: 1ffff9200000cb54
[   15.229826][    T1] R10: dffffc0000000000 R11: fffff5200000cb55 R12: 0000000000000000
[   15.238066][    T1] R13: 0000000000000001 R14: ffff88802e208000 R15: 0000000000008004
[   15.246307][    T1] FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
[   15.255391][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.261971][    T1] CR2: ffff88823ffff000 CR3: 000000000df32000 CR4: 00000000003506f0
[   15.269930][    T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   15.277901][    T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   15.285863][    T1] Call Trace:
[   15.289137][    T1]  <TASK>
[   15.292167][    T1]  ? __die_body+0x88/0xe0
[   15.296480][    T1]  ? die_addr+0x108/0x140
[   15.300794][    T1]  ? exc_general_protection+0x3dd/0x5d0
[   15.306433][    T1]  ? asm_exc_general_protection+0x26/0x30
[   15.312151][    T1]  ? check_helper_call+0x13d7/0x7620
[   15.317696][    T1]  ? check_helper_call+0x14ec/0x7620
[   15.323087][    T1]  ? __pfx_check_helper_call+0x10/0x10
[   15.328743][    T1]  ? tnum_const+0xd/0x20
[   15.333063][    T1]  do_check+0x9e29/0x10530
[   15.337512][    T1]  ? kmalloc_trace+0x1d9/0x360
[   15.342265][    T1]  ? do_check_common+0x190/0x1dd0
[   15.347908][    T1]  ? bpf_check+0x136ab/0x19010
[   15.352746][    T1]  ? kernel_init+0x1d/0x2a0
[   15.357416][    T1]  ? ret_from_fork+0x4b/0x80
[   15.362091][    T1]  ? __pfx_do_check+0x10/0x10
[   15.366750][    T1]  ? mark_reg_not_init+0xd4/0x4b0
[   15.372015][    T1]  ? __asan_memcpy+0x40/0x70
[   15.376588][    T1]  ? mark_reg_not_init+0xd4/0x4b0
[   15.381594][    T1]  do_check_common+0x14bd/0x1dd0
[   15.386655][    T1]  bpf_check+0x136ab/0x19010
[   15.391261][    T1]  ? __pfx_validate_chain+0x10/0x10
[   15.396455][    T1]  ? validate_chain+0x11b/0x58e0
[   15.401383][    T1]  ? validate_chain+0x11b/0x58e0
[   15.406524][    T1]  ? validate_chain+0x11b/0x58e0
[   15.411641][    T1]  ? validate_chain+0x11b/0x58e0
[   15.416565][    T1]  ? __pfx_bpf_check+0x10/0x10
[   15.421319][    T1]  ? __pfx_validate_chain+0x10/0x10
[   15.426499][    T1]  ? mark_lock+0x9a/0x350
[   15.430811][    T1]  ? mark_lock+0x9a/0x350
[   15.435122][    T1]  ? __lock_acquire+0x1346/0x1fd0
[   15.440128][    T1]  ? mark_lock+0x9a/0x350
[   15.444451][    T1]  ? __lock_acquire+0x1346/0x1fd0
[   15.449546][    T1]  ? mark_lock+0x9a/0x350
[   15.453880][    T1]  ? __lock_acquire+0x1346/0x1fd0
[   15.458925][    T1]  ? __pfx_lock_acquire+0x10/0x10
[   15.463951][    T1]  ? ktime_get_with_offset+0x105/0x330
[   15.469575][    T1]  ? lockdep_hardirqs_on_prepare+0x43d/0x780
[   15.476306][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[   15.482659][    T1]  ? _raw_spin_unlock_irqrestore+0xdd/0x140
[   15.488838][    T1]  ? ktime_get_with_offset+0x105/0x330
[   15.494460][    T1]  ? seqcount_lockdep_reader_access+0x157/0x220
[   15.500687][    T1]  ? lockdep_hardirqs_on+0x99/0x150
[   15.505871][    T1]  ? seqcount_lockdep_reader_access+0x1d7/0x220
[   15.512096][    T1]  ? __pfx_seqcount_lockdep_reader_access+0x10/0x10
[   15.518670][    T1]  ? pcpu_alloc+0xf1a/0x1670
[   15.523350][    T1]  ? bpf_obj_name_cpy+0x18a/0x1d0
[   15.528458][    T1]  ? bpf_lsm_bpf_prog_load+0x9/0x10
[   15.533651][    T1]  ? security_bpf_prog_load+0x87/0xb0
[   15.539207][    T1]  bpf_prog_load+0x1667/0x20f0
[   15.544077][    T1]  ? __pfx_bpf_prog_load+0x10/0x10
[   15.549174][    T1]  ? kasan_quarantine_put+0xdc/0x230
[   15.554552][    T1]  ? map_update_elem+0x363/0x6f0
[   15.559475][    T1]  ? copy_from_kernel_nofault_allowed+0xa9/0x130
[   15.565786][    T1]  ? bpf_lsm_bpf+0x9/0x10
[   15.570102][    T1]  ? security_bpf+0x87/0xb0
[   15.574700][    T1]  __sys_bpf+0x4ee/0x810
[   15.579189][    T1]  ? __pfx___sys_bpf+0x10/0x10
[   15.584016][    T1]  kern_sys_bpf+0x185/0x6b0
[   15.588592][    T1]  ? __pfx_kern_sys_bpf+0x10/0x10
[   15.593801][    T1]  ? load+0xf4/0xfd0
[   15.597854][    T1]  ? kmalloc_trace+0x1d9/0x360
[   15.602706][    T1]  ? load+0x40e/0xfd0
[   15.606676][    T1]  load+0x550/0xfd0
[   15.610560][    T1]  ? __pfx_load+0x10/0x10
[   15.615004][    T1]  ? kasan_save_track+0x51/0x80
[   15.619962][    T1]  ? kasan_save_track+0x3f/0x80
[   15.624889][    T1]  ? __kasan_kmalloc+0x98/0xb0
[   15.629899][    T1]  ? __kmalloc_node+0x251/0x4e0
[   15.634736][    T1]  ? alloc_bulk+0x472/0x6f0
[   15.639225][    T1]  ? bpf_mem_alloc_init+0x47d/0xc50
[   15.644423][    T1]  ? cpumask_kfunc_init+0x98/0x150
[   15.649710][    T1]  ? do_one_initcall+0x238/0x830
[   15.654739][    T1]  ? do_initcall_level+0x157/0x210
[   15.659948][    T1]  ? do_initcalls+0x3f/0x80
[   15.664643][    T1]  ? kernel_init_freeable+0x435/0x5d0
[   15.670263][    T1]  ? kernel_init+0x1d/0x2a0
[   15.674937][    T1]  ? ret_from_fork+0x4b/0x80
[   15.684622][    T1]  ? ret_from_fork_asm+0x1a/0x30
[   15.689876][    T1]  ? mark_lock+0x9a/0x350
[   15.694286][    T1]  ? __lock_acquire+0x1346/0x1fd0
[   15.699402][    T1]  ? _raw_spin_unlock_irqrestore+0x8f/0x140
[   15.705953][    T1]  ? lockdep_hardirqs_on+0x99/0x150
[   15.711328][    T1]  ? _raw_spin_unlock_irqrestore+0xdd/0x140
[   15.717218][    T1]  ? __pfx_add_device_randomness+0x10/0x10
[   15.723251][    T1]  ? __pfx_load+0x10/0x10
[   15.727637][    T1]  do_one_initcall+0x238/0x830
[   15.732504][    T1]  ? __pfx_load+0x10/0x10
[   15.736814][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[   15.743306][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[   15.748700][    T1]  ? __pfx_parse_args+0x10/0x10
[   15.753887][    T1]  ? do_initcalls+0x1c/0x80
[   15.758588][    T1]  ? rcu_is_watching+0x15/0xb0
[   15.763350][    T1]  do_initcall_level+0x157/0x210
[   15.768389][    T1]  do_initcalls+0x3f/0x80
[   15.772732][    T1]  kernel_init_freeable+0x435/0x5d0
[   15.777955][    T1]  ? __pfx_kernel_init_freeable+0x10/0x10
[   15.783663][    T1]  ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[   15.789977][    T1]  ? __pfx_kernel_init+0x10/0x10
[   15.794990][    T1]  ? __pfx_kernel_init+0x10/0x10
[   15.800002][    T1]  ? __pfx_kernel_init+0x10/0x10
[   15.804935][    T1]  kernel_init+0x1d/0x2a0
[   15.809370][    T1]  ret_from_fork+0x4b/0x80
[   15.813832][    T1]  ? __pfx_kernel_init+0x10/0x10
[   15.818780][    T1]  ret_from_fork_asm+0x1a/0x30
[   15.823558][    T1]  </TASK>
[   15.826588][    T1] Modules linked in:
[   15.830703][    T1] ---[ end trace 0000000000000000 ]---
[   15.836626][    T1] RIP: 0010:check_helper_call+0x14ec/0x7620
[   15.843209][    T1] Code: 8d bc 24 70 01 00 00 e8 62 f7 4c 00 4c 8b a4 24 70 01 00 00 49 8d 7c 24 1c 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 67 17 00 00 41 8b 5c 24 1c 49 8d 7c 24 20
[   15.863225][    T1] RSP: 0000:ffffc90000066000 EFLAGS: 00010207
[   15.869311][    T1] RAX: 0000000000000003 RBX: 0000000000008004 RCX: dffffc0000000000
[   15.877516][    T1] RDX: ffff8880162d0000 RSI: 0000000000008004 RDI: 000000000000001c
[   15.885761][    T1] RBP: ffffc90000066250 R08: ffffffff81ab43c7 R09: 1ffff9200000cb54
[   15.893940][    T1] R10: dffffc0000000000 R11: fffff5200000cb55 R12: 0000000000000000
[   15.902193][    T1] R13: 0000000000000001 R14: ffff88802e208000 R15: 0000000000008004
[   15.910257][    T1] FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
[   15.919196][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.925873][    T1] CR2: 0000000000000000 CR3: 000000000df32000 CR4: 00000000003506f0
[   15.933923][    T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   15.942979][    T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   15.951017][    T1] Kernel panic - not syncing: Fatal exception
[   15.957777][    T1] Kernel Offset: disabled
[   15.962097][    T1] Rebooting in 86400 seconds..


syzkaller build log:
go env (err=<nil>)
GO111MODULE='auto'
GOARCH='amd64'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3260162229=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at baa80228d
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=baa80228d652d8b1341ecf7f1411c4e4caf75bd5 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240318-105857'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=baa80228d652d8b1341ecf7f1411c4e4caf75bd5 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240318-105857'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=baa80228d652d8b1341ecf7f1411c4e4caf75bd5 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240318-105857'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"baa80228d652d8b1341ecf7f1411c4e4caf75bd5\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=13b0b5c9180000


Tested on:

commit:         ddb2ffdc libbpf: Define MFD_CLOEXEC if not available
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
kernel config:  https://syzkaller.appspot.com/x/.config?x=6fb1be60a193d440
dashboard link: https://syzkaller.appspot.com/bug?extid=33f4297b5f927648741a
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1702b481180000

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