Date: Sat, 23 Mar 2024 15:10:02 -0700
From: syzbot <syzbot+d2a2c639d03ac200a4f1@...kaller.appspotmail.com>
To: cam.alvarez.i@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bpf?] UBSAN: array-index-out-of-bounds in bpf_prog_select_runtime

Hello,

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

connector registered
[    9.572858][    T1] [drm] Initialized vgem 1.0.0 20120112 for vgem on minor 0
[    9.584256][    T1] [drm] Initialized vkms 1.0.0 20180514 for vkms on minor 1
[    9.680087][    T1] Console: switching to colour frame buffer device 128x48
[    9.696560][    T1] platform vkms: [drm] fb0: vkmsdrmfb frame buffer device
[    9.698211][    T1] usbcore: registered new interface driver udl
[    9.793530][    T1] brd: module loaded
[    9.913667][    T1] loop: module loaded
[   10.101090][    T1] zram: Added device: zram0
[   10.114153][    T1] null_blk: disk nullb0 created
[   10.115012][    T1] null_blk: module loaded
[   10.117246][    T1] Guest personality initialized and is inactive
[   10.119788][    T1] VMCI host device registered (name=vmci, major=10, minor=118)
[   10.121119][    T1] Initialized host personality
[   10.122385][    T1] usbcore: registered new interface driver rtsx_usb
[   10.124441][    T1] usbcore: registered new interface driver viperboard
[   10.125799][    T1] usbcore: registered new interface driver dln2
[   10.127995][    T1] usbcore: registered new interface driver pn533_usb
[   10.138179][    T1] nfcsim 0.2 initialized
[   10.140398][    T1] usbcore: registered new interface driver port100
[   10.142027][    T1] usbcore: registered new interface driver nfcmrvl
[   10.151644][    T1] Loading iSCSI transport class v2.0-870.
[   10.171732][    T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[   10.186563][    T1] ------------[ cut here ]------------
[   10.187348][    T1] refcount_t: decrement hit 0; leaking memory.
[   10.188508][    T1] WARNING: CPU: 0 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210
[   10.191432][    T1] Modules linked in:
[   10.192019][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-syzkaller-13182-g484193fecd2b-dirty #0
[   10.193638][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
[   10.195427][    T1] RIP: 0010:refcount_warn_saturate+0x1ed/0x210
[   10.196395][    T1] Code: 8b e8 17 42 d2 fc 90 0f 0b 90 90 e9 c3 fe ff ff e8 e8 d2 0f fd c6 05 bb 02 4d 0b 01 90 48 c7 c7 80 e3 8e 8b e8 f4 41 d2 fc 90 <0f> 0b 90 90 e9 a0 fe ff ff 48 89 ef e8 72 fb 6a fd e9 44 fe ff ff
[   10.199935][    T1] RSP: 0000:ffffc900000673c0 EFLAGS: 00010286
[   10.201025][    T1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814fe149
[   10.202204][    T1] RDX: ffff888016ec8000 RSI: ffffffff814fe156 RDI: 0000000000000001
[   10.203507][    T1] RBP: ffff88814168f58c R08: 0000000000000001 R09: 0000000000000000
[   10.204951][    T1] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88814168f58c
[   10.206164][    T1] R13: 0000000000000000 R14: 0000000006ae00b9 R15: ffff88801687a588
[   10.208440][    T1] FS:  0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
[   10.210295][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.211544][    T1] CR2: ffff88823ffff000 CR3: 000000000d97a000 CR4: 00000000003506f0
[   10.213262][    T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   10.214476][    T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   10.215639][    T1] Call Trace:
[   10.216229][    T1]  <TASK>
[   10.216789][    T1]  ? show_regs+0x8c/0xa0
[   10.217525][    T1]  ? __warn+0xe5/0x3c0
[   10.218395][    T1]  ? __wake_up_klogd.part.0+0x99/0xf0
[   10.219772][    T1]  ? refcount_warn_saturate+0x1ed/0x210
[   10.220616][    T1]  ? report_bug+0x3c0/0x580
[   10.221279][    T1]  ? handle_bug+0x3d/0x70
[   10.221955][    T1]  ? exc_invalid_op+0x17/0x50
[   10.222793][    T1]  ? asm_exc_invalid_op+0x1a/0x20
[   10.224072][    T1]  ? __warn_printk+0x199/0x350
[   10.225145][    T1]  ? __warn_printk+0x1a6/0x350
[   10.225925][    T1]  ? refcount_warn_saturate+0x1ed/0x210
[   10.226934][    T1]  __reset_page_owner+0x2ea/0x370
[   10.227736][    T1]  __free_pages_ok+0x5a9/0xbf0
[   10.228415][    T1]  ? __split_page_owner+0xdd/0x120
[   10.229191][    T1]  make_alloc_exact+0x165/0x260
[   10.229917][    T1]  vring_alloc_queue+0xc1/0x110
[   10.230635][    T1]  vring_alloc_queue_split+0x186/0x510
[   10.231420][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[   10.232251][    T1]  ? kasan_save_stack+0x42/0x60
[   10.232963][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.234590][    T1]  vring_create_virtqueue_split+0xe8/0x280
[   10.235665][    T1]  ? __pfx_vp_notify+0x10/0x10
[   10.236516][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[   10.237686][    T1]  ? virtio_scsi_init+0x75/0x100
[   10.238656][    T1]  ? do_one_initcall+0x128/0x700
[   10.239488][    T1]  ? kernel_init_freeable+0x69d/0xca0
[   10.240398][    T1]  vring_create_virtqueue+0xd7/0x140
[   10.241186][    T1]  ? __pfx_vp_notify+0x10/0x10
[   10.241965][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.243112][    T1]  setup_vq+0x123/0x2f0
[   10.243810][    T1]  ? __pfx_vp_notify+0x10/0x10
[   10.244761][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.245553][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.246547][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.247478][    T1]  vp_setup_vq+0xb1/0x380
[   10.248194][    T1]  ? iowrite16+0x55/0x80
[   10.249175][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.250422][    T1]  vp_find_vqs_msix+0x661/0xe30
[   10.251165][    T1]  vp_find_vqs+0x58/0x560
[   10.251947][    T1]  virtscsi_init+0x459/0x9f0
[   10.252881][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[   10.253796][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[   10.254568][    T1]  ? ioread8+0x4e/0xa0
[   10.255139][    T1]  ? vp_get+0xf6/0x140
[   10.255707][    T1]  virtscsi_probe+0x3b2/0xdd0
[   10.256452][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[   10.257363][    T1]  ? trace_raw_output_sched_pi_setprio+0xad/0x150
[   10.259318][    T1]  ? vring_transport_features+0x49/0xb0
[   10.260183][    T1]  virtio_dev_probe+0x5ff/0x9b0
[   10.260877][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[   10.261663][    T1]  really_probe+0x23e/0xa90
[   10.262480][    T1]  __driver_probe_device+0x1de/0x440
[   10.263462][    T1]  ? _raw_spin_unlock_irqrestore+0x52/0x80
[   10.264576][    T1]  driver_probe_device+0x4c/0x1b0
[   10.265289][    T1]  __driver_attach+0x283/0x580
[   10.265950][    T1]  ? __pfx___driver_attach+0x10/0x10
[   10.266697][    T1]  bus_for_each_dev+0x13c/0x1d0
[   10.267364][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[   10.268099][    T1]  bus_add_driver+0x2ed/0x640
[   10.268824][    T1]  driver_register+0x15c/0x4b0
[   10.269581][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[   10.270424][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[   10.271525][    T1]  virtio_scsi_init+0x75/0x100
[   10.272450][    T1]  do_one_initcall+0x128/0x700
[   10.273380][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[   10.274148][    T1]  ? trace_kmalloc+0x2d/0xe0
[   10.274844][    T1]  ? __kmalloc+0x218/0x440
[   10.275566][    T1]  kernel_init_freeable+0x69d/0xca0
[   10.276467][    T1]  ? __pfx_kernel_init+0x10/0x10
[   10.277287][    T1]  kernel_init+0x1c/0x2b0
[   10.278215][    T1]  ? __pfx_kernel_init+0x10/0x10
[   10.279001][    T1]  ret_from_fork+0x45/0x80
[   10.279722][    T1]  ? __pfx_kernel_init+0x10/0x10
[   10.280617][    T1]  ret_from_fork_asm+0x1a/0x30
[   10.281685][    T1]  </TASK>
[   10.282111][    T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[   10.283173][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-syzkaller-13182-g484193fecd2b-dirty #0
[   10.284676][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
[   10.286446][    T1] Call Trace:
[   10.286986][    T1]  <TASK>
[   10.287455][    T1]  dump_stack_lvl+0x3d/0x1f0
[   10.288227][    T1]  panic+0x6f5/0x7a0
[   10.288985][    T1]  ? __pfx_panic+0x10/0x10
[   10.288985][    T1]  ? show_trace_log_lvl+0x363/0x500
[   10.288985][    T1]  ? check_panic_on_warn+0x1f/0xb0
[   10.288985][    T1]  ? refcount_warn_saturate+0x1ed/0x210
[   10.288985][    T1]  check_panic_on_warn+0xab/0xb0
[   10.288985][    T1]  __warn+0xf1/0x3c0
[   10.288985][    T1]  ? __wake_up_klogd.part.0+0x99/0xf0
[   10.288985][    T1]  ? refcount_warn_saturate+0x1ed/0x210
[   10.288985][    T1]  report_bug+0x3c0/0x580
[   10.288985][    T1]  handle_bug+0x3d/0x70
[   10.288985][    T1]  exc_invalid_op+0x17/0x50
[   10.288985][    T1]  asm_exc_invalid_op+0x1a/0x20
[   10.288985][    T1] RIP: 0010:refcount_warn_saturate+0x1ed/0x210
[   10.298878][    T1] Code: 8b e8 17 42 d2 fc 90 0f 0b 90 90 e9 c3 fe ff ff e8 e8 d2 0f fd c6 05 bb 02 4d 0b 01 90 48 c7 c7 80 e3 8e 8b e8 f4 41 d2 fc 90 <0f> 0b 90 90 e9 a0 fe ff ff 48 89 ef e8 72 fb 6a fd e9 44 fe ff ff
[   10.298878][    T1] RSP: 0000:ffffc900000673c0 EFLAGS: 00010286
[   10.298878][    T1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814fe149
[   10.298878][    T1] RDX: ffff888016ec8000 RSI: ffffffff814fe156 RDI: 0000000000000001
[   10.298878][    T1] RBP: ffff88814168f58c R08: 0000000000000001 R09: 0000000000000000
[   10.298878][    T1] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88814168f58c
[   10.298878][    T1] R13: 0000000000000000 R14: 0000000006ae00b9 R15: ffff88801687a588
[   10.308799][    T1]  ? __warn_printk+0x199/0x350
[   10.308799][    T1]  ? __warn_printk+0x1a6/0x350
[   10.308799][    T1]  __reset_page_owner+0x2ea/0x370
[   10.308799][    T1]  __free_pages_ok+0x5a9/0xbf0
[   10.308799][    T1]  ? __split_page_owner+0xdd/0x120
[   10.308799][    T1]  make_alloc_exact+0x165/0x260
[   10.308799][    T1]  vring_alloc_queue+0xc1/0x110
[   10.308799][    T1]  vring_alloc_queue_split+0x186/0x510
[   10.308799][    T1]  ? __pfx_vring_alloc_queue_split+0x10/0x10
[   10.308799][    T1]  ? kasan_save_stack+0x42/0x60
[   10.308799][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.318898][    T1]  vring_create_virtqueue_split+0xe8/0x280
[   10.318898][    T1]  ? __pfx_vp_notify+0x10/0x10
[   10.318898][    T1]  ? __pfx_vring_create_virtqueue_split+0x10/0x10
[   10.318898][    T1]  ? virtio_scsi_init+0x75/0x100
[   10.318898][    T1]  ? do_one_initcall+0x128/0x700
[   10.318898][    T1]  ? kernel_init_freeable+0x69d/0xca0
[   10.318898][    T1]  vring_create_virtqueue+0xd7/0x140
[   10.318898][    T1]  ? __pfx_vp_notify+0x10/0x10
[   10.318898][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.318898][    T1]  setup_vq+0x123/0x2f0
[   10.318898][    T1]  ? __pfx_vp_notify+0x10/0x10
[   10.318898][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.328775][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.328775][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.328775][    T1]  vp_setup_vq+0xb1/0x380
[   10.328775][    T1]  ? iowrite16+0x55/0x80
[   10.328775][    T1]  ? __pfx_virtscsi_ctrl_done+0x10/0x10
[   10.328775][    T1]  vp_find_vqs_msix+0x661/0xe30
[   10.328775][    T1]  vp_find_vqs+0x58/0x560
[   10.328775][    T1]  virtscsi_init+0x459/0x9f0
[   10.328775][    T1]  ? __pfx_virtscsi_init+0x10/0x10
[   10.328775][    T1]  ? __pfx_default_calc_sets+0x10/0x10
[   10.328775][    T1]  ? ioread8+0x4e/0xa0
[   10.328775][    T1]  ? vp_get+0xf6/0x140
[   10.328775][    T1]  virtscsi_probe+0x3b2/0xdd0
[   10.338889][    T1]  ? __pfx_virtscsi_probe+0x10/0x10
[   10.338889][    T1]  ? trace_raw_output_sched_pi_setprio+0xad/0x150
[   10.338889][    T1]  ? vring_transport_features+0x49/0xb0
[   10.338889][    T1]  virtio_dev_probe+0x5ff/0x9b0
[   10.338889][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[   10.338889][    T1]  really_probe+0x23e/0xa90
[   10.338889][    T1]  __driver_probe_device+0x1de/0x440
[   10.338889][    T1]  ? _raw_spin_unlock_irqrestore+0x52/0x80
[   10.338889][    T1]  driver_probe_device+0x4c/0x1b0
[   10.338889][    T1]  __driver_attach+0x283/0x580
[   10.338889][    T1]  ? __pfx___driver_attach+0x10/0x10
[   10.338889][    T1]  bus_for_each_dev+0x13c/0x1d0
[   10.348774][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[   10.348774][    T1]  bus_add_driver+0x2ed/0x640
[   10.348774][    T1]  driver_register+0x15c/0x4b0
[   10.348774][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[   10.348774][    T1]  ? __pfx_virtio_scsi_init+0x10/0x10
[   10.348774][    T1]  virtio_scsi_init+0x75/0x100
[   10.348774][    T1]  do_one_initcall+0x128/0x700
[   10.348774][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[   10.348774][    T1]  ? trace_kmalloc+0x2d/0xe0
[   10.348774][    T1]  ? __kmalloc+0x218/0x440
[   10.348774][    T1]  kernel_init_freeable+0x69d/0xca0
[   10.348774][    T1]  ? __pfx_kernel_init+0x10/0x10
[   10.348774][    T1]  kernel_init+0x1c/0x2b0
[   10.358850][    T1]  ? __pfx_kernel_init+0x10/0x10
[   10.358850][    T1]  ret_from_fork+0x45/0x80
[   10.358850][    T1]  ? __pfx_kernel_init+0x10/0x10
[   10.358850][    T1]  ret_from_fork_asm+0x1a/0x30
[   10.358850][    T1]  </TASK>
[   10.358850][    T1] Kernel Offset: disabled
[   10.358850][    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-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/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-2/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-build1980677323=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at db5b7ff0c
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=db5b7ff0c1508e1f6bc77ba4df578cabb88b9914 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240312-201727'" "-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=db5b7ff0c1508e1f6bc77ba4df578cabb88b9914 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240312-201727'" "-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=db5b7ff0c1508e1f6bc77ba4df578cabb88b9914 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20240312-201727'" "-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=\"db5b7ff0c1508e1f6bc77ba4df578cabb88b9914\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=14e14231180000


Tested on:

commit:         484193fe Merge tag 'powerpc-6.9-2' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=8f186ceee5fcb0b8
dashboard link: https://syzkaller.appspot.com/bug?extid=d2a2c639d03ac200a4f1
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1298a7b6180000

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