[syzbot] [arm?] KASAN: invalid-access Write in setup_arch

Thu Jul 18 07:55:26 PDT 2024

Hello,

syzbot found the following issue on:

HEAD commit:    9dafbe7b06a9 Merge remote-tracking branch 'kernel/kvmarm/n..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git fuzzme
console output: https://syzkaller.appspot.com/x/log.txt?x=12fd98b1980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=25f90809fb74c5a4
dashboard link: https://syzkaller.appspot.com/bug?extid=1aa1114f144c4051c1dd
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-9dafbe7b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ee5f770ee892/vmlinux-9dafbe7b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/817d5b5ba669/Image-9dafbe7b.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1aa1114f144c4051c1dd at syzkaller.appspotmail.com

Booting Linux on physical CPU 0x0000000000 [0x000f0510]
Linux version 6.10.0-rc6-syzkaller-g9dafbe7b06a9 (syzkaller at syzkaller) (gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40) #0 SMP PREEMPT now
random: crng init done
Machine model: linux,dummy-virt
efi: UEFI not found.
NUMA: No NUMA configuration found
NUMA: Faking a node at [mem 0x0000000040000000-0x00000000bfffffff]
NUMA: NODE_DATA [mem 0xbfc0d340-0xbfc10fff]
Zone ranges:
  DMA      [mem 0x0000000040000000-0x00000000bfffffff]
  DMA32    empty
  Normal   empty
  Device   empty
Movable zone start for each node
Early memory node ranges
  node   0: [mem 0x0000000040000000-0x00000000bfffffff]
Initmem setup node 0 [mem 0x0000000040000000-0x00000000bfffffff]
cma: Reserved 32 MiB at 0x00000000bba00000 on node -1
psci: probing for conduit method from DT.
psci: PSCIv1.1 detected in firmware.
psci: Using standard PSCI v0.2 function IDs
psci: Trusted OS migration not required
psci: SMC Calling Convention v1.0
==================================================================
BUG: KASAN: invalid-access in smp_build_mpidr_hash arch/arm64/kernel/setup.c:133 [inline]
BUG: KASAN: invalid-access in setup_arch+0x794/0xa7c arch/arm64/kernel/setup.c:356
Write of size 4 at addr 03ff800084947e10 by task swapper/0
Pointer tag: [03], memory tag: [fe]

CPU: 0 PID: 0 Comm: swapper Not tainted 6.10.0-rc6-syzkaller-g9dafbe7b06a9 #0
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x128/0x214 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x138/0x1c8 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x118/0x5ac mm/kasan/report.c:488
 kasan_report+0xc8/0x108 mm/kasan/report.c:601
 kasan_check_range+0x94/0xb8 mm/kasan/sw_tags.c:84
 __hwasan_store4_noabort+0x20/0x2c mm/kasan/sw_tags.c:149
 smp_build_mpidr_hash arch/arm64/kernel/setup.c:133 [inline]
 setup_arch+0x794/0xa7c arch/arm64/kernel/setup.c:356
 start_kernel+0xc0/0xb10 init/main.c:926
 __primary_switched+0x84/0x8c arch/arm64/kernel/head.S:243

The buggy address belongs to stack of task swapper/0

Memory state around the buggy address:
 ffff800084947c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fe 00
 ffff800084947d00: 00 00 00 fe fe 00 00 00 fe fe fe fe fe fe fe fe
>ffff800084947e00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
                      ^
 ffff800084947f00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 ffff800084948000: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
==================================================================
kasan: KernelAddressSanitizer initialized (sw-tags, stacktrace=on)
percpu: Embedded 35 pages/cpu s103176 r8192 d31992 u143360
Detected PIPT I-cache on CPU0
CPU features: detected: GIC system register CPU interface
CPU features: detected: HCRX_EL2 register
CPU features: detected: 52-bit Virtual Addressing (LPA2)
CPU features: detected: Virtualization Host Extensions
CPU features: detected: Spectre-v4
alternatives: applying boot alternatives
Kernel command line: root=/dev/vda console=ttyAMA0 
Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes, linear)
Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes, linear)
Fallback order for Node 0: 0 
Built 1 zonelists, mobility grouping on.  Total pages: 524288
Policy zone: DMA
mem auto-init: stack:all(zero), heap alloc:on, heap free:off
stackdepot: allocating hash table via alloc_large_system_hash
stackdepot hash table entries: 1048576 (order: 12, 16777216 bytes, linear)
software IO TLB: SWIOTLB bounce buffer size adjusted to 2MB
software IO TLB: area num 1.
software IO TLB: mapped [mem 0x00000000b1d55000-0x00000000b1f55000] (2MB)
Memory: 1761408K/2097152K available (58944K kernel code, 4788K rwdata, 13864K rodata, 2048K init, 22780K bss, 302976K reserved, 32768K cma-reserved)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
allocated 4194304 bytes of page_ext
trace event string verifier disabled
Running RCU self tests
Running RCU synchronous self tests
rcu: Preemptible hierarchical RCU implementation.
rcu: 	RCU lockdep checking is enabled.
rcu: 	RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=1.
rcu: 	RCU callback double-/use-after-free debug is enabled.
rcu: 	RCU debug extended QS entry/exit.
	Trampoline variant of Tasks RCU enabled.
	Tracing variant of Tasks RCU enabled.
rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
Running RCU synchronous self tests
RCU Tasks: Setting shift to 0 and lim to 1 rcu_task_cb_adjust=1.
RCU Tasks Trace: Setting shift to 0 and lim to 1 rcu_task_cb_adjust=1.
NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
GICv3: GIC: Using split EOI/Deactivate mode
GICv3: 256 SPIs implemented
GICv3: 0 Extended SPIs implemented
Root IRQ handler: gic_handle_irq
GICv3: GICv3 features: 16 PPIs
GICv3: GICv4 features: 
GICv3: CPU0: found redistributor 0 region 0:0x00000000080a0000
ITS [mem 0x08080000-0x0809ffff]
ITS at 0x0000000008080000: Single VMOVP capable
ITS at 0x0000000008080000: allocated 8192 Devices @46e20000 (indirect, esz 8, psz 64K, shr 1)
ITS at 0x0000000008080000: allocated 8192 Interrupt Collections @46e30000 (flat, esz 8, psz 64K, shr 1)
ITS at 0x0000000008080000: allocated 8192 Virtual CPUs @46e40000 (indirect, esz 8, psz 64K, shr 1)
GICv3: using LPI property table @0x0000000046e50000
ITS: Allocated DevID ffff as GICv4 proxy device (2 slots)
ITS: Enabling GICv4 support
GICv3: CPU0: using allocated LPI pending table @0x0000000046e60000
rcu: srcu_init: Setting srcu_struct sizes based on contention.
arch_timer: cp15 timer(s) running at 62.50MHz (phys).
clocksource: arch_sys_counter: mask: 0x1ffffffffffffff max_cycles: 0x1cd42e208c, max_idle_ns: 881590405314 ns
sched_clock: 57 bits at 63MHz, resolution 16ns, wraps every 4398046511096ns
Console: colour dummy device 80x25
Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
... MAX_LOCKDEP_SUBCLASSES:  8
... MAX_LOCK_DEPTH:          48
... MAX_LOCKDEP_KEYS:        8192
... CLASSHASH_SIZE:          4096
... MAX_LOCKDEP_ENTRIES:     131072
... MAX_LOCKDEP_CHAINS:      65536
... CHAINHASH_SIZE:          32768
 memory used by lock dependency info: 11817 kB
 memory used for stack traces: 8320 kB
 per task-struct memory footprint: 1920 bytes
Calibrating delay loop (skipped), value calculated using timer frequency.. 125.00 BogoMIPS (lpj=625000)
pid_max: default: 32768 minimum: 301
LSM: initializing lsm=lockdown,capability,landlock,yama,safesetid,tomoyo,selinux,ima,evm
landlock: Up and running.
Yama: becoming mindful.
TOMOYO Linux initialized
SELinux:  Initializing.
Mount-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
Running RCU synchronous self tests
Running RCU synchronous self tests

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