Re: [syzbot] [net?] KMSAN: kernel-infoleak in __skb_datagram_iter (2)

[syzbot]

Hello,

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

.
[   10.076074][    T1] fuse: init (API version 7.39)
[   10.080364][    T1] orangefs_debugfs_init: called with debug mask: :none: :0:
[   10.082002][    T1] orangefs_init: module version upstream loaded
[   10.083592][    T1] JFS: nTxBlock = 8192, nTxLock = 65536
[   10.099770][    T1] SGI XFS with ACLs, security attributes, realtime, quota, no debug enabled
[   10.104241][    T1] 9p: Installing v9fs 9p2000 file system support
[   10.105539][    T1] NILFS version 2 loaded
[   10.106156][    T1] befs: version: 0.9.3
[   10.107195][    T1] ocfs2: Registered cluster interface o2cb
[   10.108527][    T1] ocfs2: Registered cluster interface user
[   10.111379][    T1] OCFS2 User DLM kernel interface loaded
[   10.118460][    T1] gfs2: GFS2 installed
[   10.135588][    T1] ceph: loaded (mds proto 32)
[   12.024322][    T1] NET: Registered PF_ALG protocol family
[   12.025308][    T1] xor: automatically using best checksumming function   avx       
[   12.027314][    T1] async_tx: api initialized (async)
[   12.028180][    T1] Key type asymmetric registered
[   12.029109][    T1] Asymmetric key parser 'x509' registered
[   12.030157][    T1] Asymmetric key parser 'pkcs8' registered
[   12.030980][    T1] Key type pkcs7_test registered
[   12.032530][    T1] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 240)
[   12.034815][    T1] io scheduler mq-deadline registered
[   12.035601][    T1] io scheduler kyber registered
[   12.036477][    T1] io scheduler bfq registered
[   12.043584][    T1] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
[   12.054905][    T1] ACPI: button: Power Button [PWRF]
[   12.061506][    T1] input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN:00/input/input1
[   12.071048][    T1] ACPI: button: Sleep Button [SLPF]
[   12.086912][    T1] ioatdma: Intel(R) QuickData Technology Driver 5.00
[   12.130351][    T1] ACPI: \_SB_.LNKC: Enabled at IRQ 11
[   12.135899][    T1] virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver
[   12.175460][    T1] ACPI: \_SB_.LNKD: Enabled at IRQ 10
[   12.181044][    T1] virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver
[   12.221372][    T1] ACPI: \_SB_.LNKB: Enabled at IRQ 10
[   12.226897][    T1] virtio-pci 0000:00:06.0: virtio_pci: leaving for legacy driver
[   12.317580][  T257] kworker/u4:0 (257) used greatest stack depth: 11000 bytes left
[   12.798023][    T1] N_HDLC line discipline registered with maxframe=4096
[   12.805613][    T1] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[   12.815494][    T1] 00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[   12.835349][    T1] 00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
[   12.855309][    T1] 00:05: ttyS2 at I/O 0x3e8 (irq = 6, base_baud = 115200) is a 16550A
[   12.875589][    T1] 00:06: ttyS3 at I/O 0x2e8 (irq = 7, base_baud = 115200) is a 16550A
[   12.907146][    T1] Non-volatile memory driver v1.3
[   12.921393][    T1] Linux agpgart interface v0.103
[   12.931868][    T1] ACPI: bus type drm_connector registered
[   12.943489][    T1] [drm] Initialized vgem 1.0.0 20120112 for vgem on minor 0
[   12.959783][    T1] [drm] Initialized vkms 1.0.0 20180514 for vkms on minor 1
[   13.248241][    T1] Console: switching to colour frame buffer device 128x48
[   13.314754][    T1] platform vkms: [drm] fb0: vkmsdrmfb frame buffer device
[   13.322329][    T1] usbcore: registered new interface driver udl
[   13.472888][    T1] brd: module loaded
[   13.561610][    T1] loop: module loaded
[   13.689528][    T1] zram: Added device: zram0
[   13.702671][    T1] null_blk: disk nullb0 created
[   13.707565][    T1] null_blk: module loaded
[   13.712923][    T1] Guest personality initialized and is inactive
[   13.719805][    T1] VMCI host device registered (name=vmci, major=10, minor=118)
[   13.727398][    T1] Initialized host personality
[   13.732444][    T1] usbcore: registered new interface driver rtsx_usb
[   13.741306][    T1] usbcore: registered new interface driver viperboard
[   13.748470][    T1] usbcore: registered new interface driver dln2
[   13.755172][    T1] usbcore: registered new interface driver pn533_usb
[   13.765466][    T1] nfcsim 0.2 initialized
[   13.769944][    T1] usbcore: registered new interface driver port100
[   13.776737][    T1] usbcore: registered new interface driver nfcmrvl
[   13.789159][    T1] Loading iSCSI transport class v2.0-870.
[   13.809621][    T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues
[   13.830894][    T1] scsi host0: Virtio SCSI HBA
[   14.080706][    T1] st: Version 20160209, fixed bufsize 32768, s/g segs 256
[   14.093000][   T41] scsi 0:0:1:0: Direct-Access     Google   PersistentDisk   1    PQ: 0 ANSI: 6
[   14.119106][    T1] Rounding down aligned max_sectors from 4294967295 to 4294967288
[   14.128024][    T1] db_root: cannot open: /etc/target
[   14.157608][    T1] =====================================================
[   14.157758][    T1] BUG: KMSAN: use-after-free in __list_del_entry_valid_or_report+0x19e/0x490
[   14.157853][    T1]  __list_del_entry_valid_or_report+0x19e/0x490
[   14.157942][    T1]  stack_depot_save_flags+0x3e7/0x7b0
[   14.158005][    T1]  stack_depot_save+0x12/0x20
[   14.158059][    T1]  ref_tracker_alloc+0x215/0x700
[   14.158123][    T1]  linkwatch_fire_event+0x32b/0x6d0
[   14.158208][    T1]  netif_carrier_off+0xec/0x110
[   14.158278][    T1]  bond_create+0x19d/0x2a0
[   14.158354][    T1]  bonding_init+0x1a7/0x2d0
[   14.158412][    T1]  do_one_initcall+0x216/0x960
[   14.158478][    T1]  do_initcall_level+0x140/0x350
[   14.158540][    T1]  do_initcalls+0xf0/0x1d0
[   14.158595][    T1]  do_basic_setup+0x22/0x30
[   14.158651][    T1]  kernel_init_freeable+0x300/0x4b0
[   14.158713][    T1]  kernel_init+0x2f/0x7e0
[   14.158781][    T1]  ret_from_fork+0x66/0x80
[   14.158855][    T1]  ret_from_fork_asm+0x11/0x20
[   14.158921][    T1] 
[   14.158930][    T1] Uninit was created at:
[   14.158959][    T1]  __free_pages_ok+0x133/0xeb0
[   14.159060][    T1]  alloc_pages_exact+0x2f5/0x350
[   14.159060][    T1]  vring_alloc_queue_split+0x2d9/0x990
[   14.159060][    T1]  vring_create_virtqueue_split+0x89/0x380
[   14.159060][    T1]  vring_create_virtqueue+0x101/0x1a0
[   14.159060][    T1]  setup_vq+0x175/0x510
[   14.159060][    T1]  vp_setup_vq+0x103/0x630
[   14.159060][    T1]  vp_find_vqs_msix+0x1162/0x16c0
[   14.159060][    T1]  vp_find_vqs+0x78/0x770
[   14.159060][    T1]  virtscsi_init+0xff7/0x17a0
[   14.159060][    T1]  virtscsi_probe+0x43b/0xfe0
[   14.159060][    T1]  virtio_dev_probe+0x16df/0x1900
[   14.159060][    T1]  really_probe+0x506/0xf40
[   14.159060][    T1]  __driver_probe_device+0x2a7/0x5d0
[   14.159060][    T1]  driver_probe_device+0x72/0x7b0
[   14.159060][    T1]  __driver_attach+0x710/0xa30
[   14.159060][    T1]  bus_for_each_dev+0x34c/0x530
[   14.159060][    T1]  driver_attach+0x51/0x60
[   14.159060][    T1]  bus_add_driver+0x747/0xca0
[   14.159060][    T1]  driver_register+0x3fb/0x650
[   14.159060][    T1]  register_virtio_driver+0xd1/0xf0
[   14.159060][    T1]  virtio_scsi_init+0x123/0x2f0
[   14.159060][    T1]  do_one_initcall+0x216/0x960
[   14.159060][    T1]  do_initcall_level+0x140/0x350
[   14.159060][    T1]  do_initcalls+0xf0/0x1d0
[   14.159060][    T1]  do_basic_setup+0x22/0x30
[   14.159060][    T1]  kernel_init_freeable+0x300/0x4b0
[   14.159060][    T1]  kernel_init+0x2f/0x7e0
[   14.159060][    T1]  ret_from_fork+0x66/0x80
[   14.159060][    T1]  ret_from_fork_asm+0x11/0x20
[   14.159060][    T1] 
[   14.159060][    T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc5-syzkaller-gb401b621758e-dirty #0
[   14.159060][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
[   14.159060][    T1] =====================================================
[   14.159060][    T1] Disabling lock debugging due to kernel taint
[   14.159060][    T1] Kernel panic - not syncing: kmsan.panic set ...
[   14.159060][    T1] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G    B              6.8.0-rc5-syzkaller-gb401b621758e-dirty #0
[   14.159060][    T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
[   14.159060][    T1] Call Trace:
[   14.159060][    T1]  <TASK>
[   14.159060][    T1]  dump_stack_lvl+0x1bf/0x240
[   14.159060][    T1]  dump_stack+0x1e/0x20
[   14.159060][    T1]  panic+0x4de/0xc90
[   14.159060][    T1]  kmsan_report+0x2d0/0x2d0
[   14.159060][    T1]  ? filter_irq_stacks+0x164/0x1a0
[   14.159060][    T1]  ? __msan_warning+0x96/0x110
[   14.159060][    T1]  ? __list_del_entry_valid_or_report+0x19e/0x490
[   14.159060][    T1]  ? stack_depot_save_flags+0x3e7/0x7b0
[   14.159060][    T1]  ? stack_depot_save+0x12/0x20
[   14.159060][    T1]  ? ref_tracker_alloc+0x215/0x700
[   14.159060][    T1]  ? linkwatch_fire_event+0x32b/0x6d0
[   14.159060][    T1]  ? netif_carrier_off+0xec/0x110
[   14.159060][    T1]  ? bond_create+0x19d/0x2a0
[   14.159060][    T1]  ? bonding_init+0x1a7/0x2d0
[   14.159060][    T1]  ? do_one_initcall+0x216/0x960
[   14.159060][    T1]  ? do_initcall_level+0x140/0x350
[   14.159060][    T1]  ? do_initcalls+0xf0/0x1d0
[   14.159060][    T1]  ? do_basic_setup+0x22/0x30
[   14.159060][    T1]  ? kernel_init_freeable+0x300/0x4b0
[   14.159060][    T1]  ? kernel_init+0x2f/0x7e0
[   14.159060][    T1]  ? ret_from_fork+0x66/0x80
[   14.159060][    T1]  ? ret_from_fork_asm+0x11/0x20
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? _raw_spin_lock_irqsave+0x35/0xc0
[   14.159060][    T1]  ? filter_irq_stacks+0x60/0x1a0
[   14.159060][    T1]  ? stack_depot_save_flags+0x2c/0x7b0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  __msan_warning+0x96/0x110
[   14.159060][    T1]  __list_del_entry_valid_or_report+0x19e/0x490
[   14.159060][    T1]  stack_depot_save_flags+0x3e7/0x7b0
[   14.159060][    T1]  stack_depot_save+0x12/0x20
[   14.159060][    T1]  ref_tracker_alloc+0x215/0x700
[   14.159060][    T1]  ? linkwatch_fire_event+0x32b/0x6d0
[   14.159060][    T1]  ? netif_carrier_off+0xec/0x110
[   14.159060][    T1]  ? bond_create+0x19d/0x2a0
[   14.159060][    T1]  ? bonding_init+0x1a7/0x2d0
[   14.159060][    T1]  ? do_one_initcall+0x216/0x960
[   14.159060][    T1]  ? do_initcall_level+0x140/0x350
[   14.159060][    T1]  ? do_initcalls+0xf0/0x1d0
[   14.159060][    T1]  ? do_basic_setup+0x22/0x30
[   14.159060][    T1]  ? kernel_init_freeable+0x300/0x4b0
[   14.159060][    T1]  ? kernel_init+0x2f/0x7e0
[   14.159060][    T1]  ? ret_from_fork+0x66/0x80
[   14.159060][    T1]  ? ret_from_fork_asm+0x11/0x20
[   14.159060][    T1]  ? kmsan_internal_unpoison_memory+0x14/0x20
[   14.159060][    T1]  linkwatch_fire_event+0x32b/0x6d0
[   14.159060][    T1]  ? advisor_target_scan_time_store+0xe0/0x170
[   14.159060][    T1]  netif_carrier_off+0xec/0x110
[   14.159060][    T1]  bond_create+0x19d/0x2a0
[   14.159060][    T1]  bonding_init+0x1a7/0x2d0
[   14.159060][    T1]  ? spi_dln2_driver_init+0x40/0x40
[   14.159060][    T1]  do_one_initcall+0x216/0x960
[   14.159060][    T1]  ? spi_dln2_driver_init+0x40/0x40
[   14.159060][    T1]  ? kmsan_get_metadata+0xb0/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? filter_irq_stacks+0x164/0x1a0
[   14.159060][    T1]  ? stack_depot_save_flags+0x2c/0x7b0
[   14.159060][    T1]  ? skip_spaces+0x8f/0xc0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? parse_args+0x1511/0x15e0
[   14.159060][    T1]  ? kmsan_get_metadata+0x146/0x1c0
[   14.159060][    T1]  ? kmsan_get_shadow_origin_ptr+0x4d/0xa0
[   14.159060][    T1]  ? spi_dln2_driver_init+0x40/0x40
[   14.159060][    T1]  do_initcall_level+0x140/0x350
[   14.159060][    T1]  do_initcalls+0xf0/0x1d0
[   14.159060][    T1]  ? arch_cpuhp_init_parallel_bringup+0xe0/0xe0
[   14.159060][    T1]  do_basic_setup+0x22/0x30
[   14.159060][    T1]  kernel_init_freeable+0x300/0x4b0
[   14.159060][    T1]  ? rest_init+0x260/0x260
[   14.159060][    T1]  kernel_init+0x2f/0x7e0
[   14.159060][    T1]  ? rest_init+0x260/0x260
[   14.159060][    T1]  ret_from_fork+0x66/0x80
[   14.159060][    T1]  ? rest_init+0x260/0x260
[   14.159060][    T1]  ret_from_fork_asm+0x11/0x20
[   14.159060][    T1]  </TASK>
[   14.159060][    T1] Kernel Offset: disabled


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-build3485226163=/tmp/go-build -gno-record-gcc-switches'

git status (err=<nil>)
HEAD detached at 3222d10cb
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:32: run command via tools/syz-env for best compatibility, see:
Makefile:33: 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
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=3222d10cbe77bbedb5a7c455e5bcb6b7081a63b7 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20231213-164354'" "-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=3222d10cbe77bbedb5a7c455e5bcb6b7081a63b7 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20231213-164354'" "-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=3222d10cbe77bbedb5a7c455e5bcb6b7081a63b7 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20231213-164354'" "-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=\"3222d10cbe77bbedb5a7c455e5bcb6b7081a63b7\"


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=1556f362180000


Tested on:

commit:         b401b621 Linux 6.8-rc5
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=d33318d4e4a0d226
dashboard link: https://syzkaller.appspot.com/bug?extid=34ad5fab48f7bf510349
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=127e7e94180000