Message-ID: <0000000000008fe2100602e008a4@google.com>
Date:   Mon, 14 Aug 2023 04:04:59 -0700
From:   syzbot <syzbot+2f508e913916096bf53a@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, rppt@...nel.org,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] [mm?] upstream boot error: KASAN: slab-out-of-bounds Read in bootstrap

Hello,

syzbot found the following issue on:

HEAD commit:    3feecb1b8483 Merge tag 'char-misc-6.5-rc6' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=137dddaba80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d84c6cf3c2bbdb4d
dashboard link: https://syzkaller.appspot.com/bug?extid=2f508e913916096bf53a
compiler:       aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-3feecb1b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/066a563f6f65/vmlinux-3feecb1b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eb9963107316/Image-3feecb1b.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2f508e913916096bf53a@...kaller.appspotmail.com

Booting Linux on physical CPU 0x0000000000 [0x000f0510]
Linux version 6.5.0-rc5-syzkaller-00349-g3feecb1b8483 (syzkaller@...kaller) (aarch64-linux-gnu-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 0xbf9f6000-0xbf9f8fff]
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 0x00000000bb800000
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
percpu: Embedded 22 pages/cpu s51016 r8192 d30904 u90112
Detected PIPT I-cache on CPU0
CPU features: detected: Address authentication (architected QARMA5 algorithm)
CPU features: detected: HCRX_EL2 register
CPU features: detected: Virtualization Host Extensions
CPU features: detected: Hardware dirty bit management
CPU features: detected: Memory Tagging Extension
CPU features: detected: Asymmetric MTE Tag Check Fault
CPU features: detected: Spectre-v4
MTE: enabled in synchronous mode at EL1
alternatives: applying boot alternatives
kasan: KernelAddressSanitizer initialized (hw-tags, mode=sync, vmalloc=on, stacktrace=on)
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: 516096
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: 11, 8388608 bytes, linear)
software IO TLB: area num 2.
software IO TLB: mapped [mem 0x00000000b6d00000-0x00000000bad00000] (64MB)
Memory: 1904996K/2097152K available (25152K kernel code, 2446K rwdata, 10084K rodata, 1280K init, 1475K bss, 159388K reserved, 32768K cma-reserved)
==================================================================
BUG: KASAN: slab-out-of-bounds in __kasan_slab_alloc+0x7c/0xcc mm/kasan/common.c:331
Read at addr fcff000002c01008 by task swapper/0
Pointer tag: [fc], memory tag: [fd]

CPU: 0 PID: 0 Comm: swapper Not tainted 6.5.0-rc5-syzkaller-00349-g3feecb1b8483 #0
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:233
 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:240
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x48/0x60 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x108/0x618 mm/kasan/report.c:475
 kasan_report+0x88/0xac mm/kasan/report.c:588
 report_tag_fault arch/arm64/mm/fault.c:334 [inline]
 do_tag_recovery arch/arm64/mm/fault.c:346 [inline]
 __do_kernel_fault+0x180/0x1ec arch/arm64/mm/fault.c:393
 do_bad_area arch/arm64/mm/fault.c:493 [inline]
 do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:771
 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:847
 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:369
 el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:429
 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:586
 __kasan_slab_alloc+0x7c/0xcc mm/kasan/common.c:331
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:762 [inline]
 slab_alloc_node mm/slub.c:3470 [inline]
 slab_alloc mm/slub.c:3478 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3485 [inline]
 kmem_cache_alloc+0x144/0x290 mm/slub.c:3494
 kmem_cache_zalloc include/linux/slab.h:693 [inline]
 bootstrap+0x2c/0x174 mm/slub.c:4988
 kmem_cache_init+0x144/0x1c8 mm/slub.c:5051
 mm_core_init+0x23c/0x2d0 mm/mm_init.c:2787
 start_kernel+0x220/0x5fc init/main.c:928
 __primary_switched+0xb4/0xbc arch/arm64/kernel/head.S:523

Allocated by task 0:
 kasan_save_stack+0x3c/0x64 mm/kasan/common.c:45
 save_stack_info+0x38/0x118 mm/kasan/tags.c:104
 kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:138
 __kasan_slab_alloc+0x94/0xcc mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:762 [inline]
 slab_alloc_node mm/slub.c:3470 [inline]
 slab_alloc mm/slub.c:3478 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3485 [inline]
 kmem_cache_alloc+0x144/0x290 mm/slub.c:3494
 kmem_cache_zalloc include/linux/slab.h:693 [inline]
 bootstrap+0x2c/0x174 mm/slub.c:4988
 kmem_cache_init+0x134/0x1c8 mm/slub.c:5050
 mm_core_init+0x23c/0x2d0 mm/mm_init.c:2787
 start_kernel+0x220/0x5fc init/main.c:928
 __primary_switched+0xb4/0xbc arch/arm64/kernel/head.S:523

The buggy address belongs to the object at ffff000002c01000
 which belongs to the cache kmem_cache of size 208
The buggy address is located 8 bytes inside of
 208-byte region [ffff000002c01000, ffff000002c010d0)

The buggy address belongs to the physical page:
page:(____ptrval____) refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42c01
flags: 0x1ffc00000000200(slab|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0)
page_type: 0xffffffff()
raw: 01ffc00000000200 fcff000002c01000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff000002c00e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff000002c00f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff000002c01000: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
                   ^
 ffff000002c01100: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
 ffff000002c01200: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
==================================================================
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
rcu: Preemptible hierarchical RCU implementation.
rcu: 	RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.
	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=2
NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
Root IRQ handler: gic_handle_irq
GIC: Using split EOI/Deactivate mode
GICv2m: range[mem 0x08020000-0x08020fff], SPI[80:143]
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
kfence: initialized - using 2097152 bytes for 255 objects at 0x(____ptrval____)-0x(____ptrval____)
Console: colour dummy device 80x25
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,smack,integrity
landlock: Up and running.
Yama: becoming mindful.
TOMOYO Linux initialized
Smack:  Initializing.
Smack:  Netfilter enabled.
Smack:  IPv6 Netfilter enabled.
Mount-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
Detected PIPT I-cache on CPU1
CPU1: Booted secondary processor 0x0000000001 [0x000f0510]


---
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If the bug is already fixed, let syzbot know by replying with:
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