Subject: Re: [PATCH] mm: Make ksize() a reporting-only function

From: kernel test robot <[email-masked]>
Date: Mon, 24 Oct 2022 14:13:03 +0800

Greeting,

FYI, we noticed BUG:KASAN:slab-out-of-bounds_in_copy_array due to commit (built with gcc-11):

commit: d916d97f33952312ca6b8240b40ed79cc9cb04b2 ("[PATCH] mm: Make ksize() a reporting-only function")
url: https://github.com/intel-lab-lkp/linux/commits/Kees-Cook/mm-Make-ksize-a-reporting-only-function/20221023-020908
base: https://git.kernel.org/cgit/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/linux-mm/[email-masked]
patch subject: [PATCH] mm: Make ksize() a reporting-only function

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):

If you fix the issue, kindly add following tag
| Reported-by: kernel test robot <[email-masked]>
| Link: https://lore.kernel.org/r/[email-masked]

[ 32.059131][ T1] BUG: KASAN: slab-out-of-bounds in copy_array (kbuild/src/x86_64-3/arch/x86/kernel/cpu/hypervisor.c:91) 
[   32.059705][    T1] Write of size 32 at addr ffff88814b9d75c0 by task systemd/1
[   32.060330][    T1]
[   32.060576][    T1] CPU: 1 PID: 1 Comm: systemd Not tainted 6.1.0-rc1-00216-gd916d97f3395 #2
[   32.061273][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
[   32.062082][    T1] Call Trace:
[   32.062393][    T1]  <TASK>
[ 32.062680][ T1] dump_stack_lvl (kbuild/src/x86_64-3/lib/dump_stack.c:107 (discriminator 4)) 
[ 32.063071][ T1] print_address_description+0x87/0x2a5 
[ 32.063609][ T1] print_report (kbuild/src/x86_64-3/mm/kasan/report.c:365) 
[ 32.064003][ T1] ? kasan_addr_to_slab (kbuild/src/x86_64-3/mm/kasan/common.c:35) 
[ 32.064424][ T1] ? copy_array (kbuild/src/x86_64-3/arch/x86/kernel/cpu/hypervisor.c:91) 
[ 32.064801][ T1] kasan_report (kbuild/src/x86_64-3/mm/kasan/report.c:131 kbuild/src/x86_64-3/mm/kasan/report.c:466) 
[ 32.065188][ T1] ? copy_array (kbuild/src/x86_64-3/arch/x86/kernel/cpu/hypervisor.c:91) 
[ 32.065570][ T1] kasan_check_range (kbuild/src/x86_64-3/mm/kasan/generic.c:190) 
[ 32.065986][ T1] memcpy (kbuild/src/x86_64-3/mm/kasan/shadow.c:65 (discriminator 1)) 
[ 32.066333][ T1] copy_array (kbuild/src/x86_64-3/arch/x86/kernel/cpu/hypervisor.c:91) 
[ 32.066699][ T1] copy_verifier_state (kbuild/src/x86_64-3/kernel/bpf/verifier.c:1189) 
[ 32.067124][ T1] pop_stack (kbuild/src/x86_64-3/kernel/bpf/verifier.c:1252) 
[ 32.067502][ T1] do_check (kbuild/src/x86_64-3/kernel/bpf/verifier.c:12441) 
[ 32.067878][ T1] ? lock_downgrade (kbuild/src/x86_64-3/kernel/locking/lockdep.c:5320) 
[ 32.068294][ T1] ? check_helper_call (kbuild/src/x86_64-3/kernel/bpf/verifier.c:12144) 
[ 32.068737][ T1] ? kasan_quarantine_put (kbuild/src/x86_64-3/arch/x86/include/asm/irqflags.h:45 (discriminator 1) kbuild/src/x86_64-3/arch/x86/include/asm/irqflags.h:80 (discriminator 1) kbuild/src/x86_64-3/arch/x86/include/asm/irqflags.h:138 (discriminator 1) kbuild/src/x86_64-3/mm/kasan/quarantine.c:242 (discriminator 1)) 
[ 32.069181][ T1] ? trace_hardirqs_on (kbuild/src/x86_64-3/kernel/trace/trace_preemptirq.c:50 (discriminator 22)) 
[ 32.069605][ T1] ? memset (kbuild/src/x86_64-3/mm/kasan/shadow.c:44) 
[ 32.069960][ T1] ? memset (kbuild/src/x86_64-3/mm/kasan/shadow.c:44) 
[ 32.070317][ T1] ? memset (kbuild/src/x86_64-3/mm/kasan/shadow.c:44) 
[ 32.070683][ T1] do_check_common (kbuild/src/x86_64-3/kernel/bpf/verifier.c:14642) 
[ 32.071088][ T1] ? check_cfg (kbuild/src/x86_64-3/kernel/bpf/verifier.c:10938) 
[ 32.071483][ T1] bpf_check (kbuild/src/x86_64-3/kernel/bpf/verifier.c:14705 kbuild/src/x86_64-3/kernel/bpf/verifier.c:15275) 
[ 32.071869][ T1] ? find_held_lock (kbuild/src/x86_64-3/kernel/locking/lockdep.c:5158) 
[ 32.072279][ T1] ? bpf_prog_load (kbuild/src/x86_64-3/kernel/bpf/syscall.c:2598) 
[ 32.072696][ T1] ? bpf_get_btf_vmlinux (kbuild/src/x86_64-3/kernel/bpf/verifier.c:15159) 
[ 32.073124][ T1] ? lockdep_hardirqs_on_prepare (kbuild/src/x86_64-3/kernel/locking/lockdep.c:4528) 
[ 32.073647][ T1] ? memset (kbuild/src/x86_64-3/mm/kasan/shadow.c:44) 
[ 32.074006][ T1] bpf_prog_load (kbuild/src/x86_64-3/kernel/bpf/syscall.c:2605) 
[ 32.074412][ T1] ? bpf_prog_bind_map (kbuild/src/x86_64-3/kernel/bpf/syscall.c:2464) 
[ 32.074839][ T1] ? lock_acquire (kbuild/src/x86_64-3/kernel/locking/lockdep.c:466 kbuild/src/x86_64-3/kernel/locking/lockdep.c:5670 kbuild/src/x86_64-3/kernel/locking/lockdep.c:5633) 
[ 32.075244][ T1] ? __might_fault (kbuild/src/x86_64-3/mm/memory.c:5645 kbuild/src/x86_64-3/mm/memory.c:5638) 
[ 32.075654][ T1] ? lock_downgrade (kbuild/src/x86_64-3/kernel/locking/lockdep.c:5320) 
[ 32.076067][ T1] ? lock_is_held_type (kbuild/src/x86_64-3/kernel/locking/lockdep.c:5409 kbuild/src/x86_64-3/kernel/locking/lockdep.c:5711) 
[ 32.076489][ T1] ? __might_fault (kbuild/src/x86_64-3/mm/memory.c:5645 kbuild/src/x86_64-3/mm/memory.c:5638) 
[ 32.076887][ T1] ? lock_release (kbuild/src/x86_64-3/kernel/locking/lockdep.c:466 kbuild/src/x86_64-3/kernel/locking/lockdep.c:5690) 
[ 32.077284][ T1] __sys_bpf (kbuild/src/x86_64-3/kernel/bpf/syscall.c:4965) 
[ 32.077662][ T1] ? link_create (kbuild/src/x86_64-3/kernel/bpf/syscall.c:4912) 
[ 32.078055][ T1] ? trace_hardirqs_on (kbuild/src/x86_64-3/kernel/trace/trace_preemptirq.c:50 (discriminator 22)) 
[ 32.079667][ T1] ? task_work_run (kbuild/src/x86_64-3/kernel/task_work.c:182 (discriminator 1)) 
[ 32.080090][ T1] __ia32_sys_bpf (kbuild/src/x86_64-3/kernel/bpf/syscall.c:5067) 
[ 32.080483][ T1] __do_fast_syscall_32 (kbuild/src/x86_64-3/arch/x86/entry/common.c:112 kbuild/src/x86_64-3/arch/x86/entry/common.c:178) 
[ 32.080911][ T1] ? lockdep_hardirqs_on_prepare (kbuild/src/x86_64-3/kernel/locking/lockdep.c:4528) 
[ 32.081432][ T1] ? __do_fast_syscall_32 (kbuild/src/x86_64-3/arch/x86/entry/common.c:183) 
[ 32.081869][ T1] ? __do_fast_syscall_32 (kbuild/src/x86_64-3/arch/x86/entry/common.c:183) 
[ 32.082310][ T1] ? lockdep_hardirqs_on_prepare (kbuild/src/x86_64-3/kernel/locking/lockdep.c:4528) 
[ 32.082836][ T1] ? __do_fast_syscall_32 (kbuild/src/x86_64-3/arch/x86/entry/common.c:183) 
[ 32.083292][ T1] do_fast_syscall_32 (kbuild/src/x86_64-3/arch/x86/entry/common.c:203) 
[ 32.083709][ T1] entry_SYSENTER_compat_after_hwframe (kbuild/src/x86_64-3/arch/x86/entry/entry_64_compat.S:122) 
[   32.084213][    T1] RIP: 0023:0xf7fb6549
[ 32.084574][ T1] Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
All code
========
   0:	03 74 c0 01          	add    0x1(%rax,%rax,8),%esi
   4:	10 05 03 74 b8 01    	adc    %al,0x1b87403(%rip)        # 0x1b8740d
   a:	10 06                	adc    %al,(%rsi)
   c:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
  10:	10 07                	adc    %al,(%rdi)
  12:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
  16:	10 08                	adc    %cl,(%rax)
  18:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1c:	00 00                	add    %al,(%rax)
  1e:	00 00                	add    %al,(%rax)
  20:	00 51 52             	add    %dl,0x52(%rcx)
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter 
  28:	cd 80                	int    $0x80
  2a:*	5d                   	pop    %rbp		<-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	retq   
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  39:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi

Code starting with the faulting instruction
===========================================
   0:	5d                   	pop    %rbp
   1:	5a                   	pop    %rdx
   2:	59                   	pop    %rcx
   3:	c3                   	retq   
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
   f:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
[   32.086028][    T1] RSP: 002b:00000000ffdde7dc EFLAGS: 00200206 ORIG_RAX: 0000000000000165
[   32.086706][    T1] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000ffdde818
[   32.087375][    T1] RDX: 0000000000000070 RSI: 000000005805ebe0 RDI: 0000000000000000
[   32.088030][    T1] RBP: 000000000000000f R08: 0000000000000000 R09: 0000000000000000
[   32.088688][    T1] R10: 0000000000000000 R11: 0000000000200206 R12: 0000000000000000
[   32.089341][    T1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   32.090006][    T1]  </TASK>
[   32.090303][    T1]
[   32.090550][    T1] Allocated by task 1:
[ 32.090908][ T1] kasan_save_stack (kbuild/src/x86_64-3/mm/kasan/common.c:46) 
[ 32.091316][ T1] kasan_set_track (kbuild/src/x86_64-3/mm/kasan/common.c:52) 
[ 32.091717][ T1] __kasan_krealloc (kbuild/src/x86_64-3/mm/kasan/common.c:440) 
[ 32.092131][ T1] krealloc (kbuild/src/x86_64-3/include/linux/kasan.h:231 kbuild/src/x86_64-3/mm/slab_common.c:1346 kbuild/src/x86_64-3/mm/slab_common.c:1383) 
[ 32.092490][ T1] is_state_visited (kbuild/src/x86_64-3/kernel/bpf/verifier.c:2505 kbuild/src/x86_64-3/kernel/bpf/verifier.c:11982) 
[ 32.092912][ T1] do_check (kbuild/src/x86_64-3/kernel/bpf/verifier.c:12176) 
[ 32.093285][ T1] do_check_common (kbuild/src/x86_64-3/kernel/bpf/verifier.c:14642) 
[ 32.093692][ T1] bpf_check (kbuild/src/x86_64-3/kernel/bpf/verifier.c:14705 kbuild/src/x86_64-3/kernel/bpf/verifier.c:15275) 
[ 32.094074][ T1] bpf_prog_load (kbuild/src/x86_64-3/kernel/bpf/syscall.c:2605) 
[ 32.094473][ T1] __sys_bpf (kbuild/src/x86_64-3/kernel/bpf/syscall.c:4965) 
[ 32.094851][ T1] __ia32_sys_bpf (kbuild/src/x86_64-3/kernel/bpf/syscall.c:5067) 
[ 32.095246][ T1] __do_fast_syscall_32 (kbuild/src/x86_64-3/arch/x86/entry/common.c:112 kbuild/src/x86_64-3/arch/x86/entry/common.c:178) 
[ 32.095674][ T1] do_fast_syscall_32 (kbuild/src/x86_64-3/arch/x86/entry/common.c:203) 
[ 32.096084][ T1] entry_SYSENTER_compat_after_hwframe (kbuild/src/x86_64-3/arch/x86/entry/entry_64_compat.S:122) 
[   32.096593][    T1]
[   32.096840][    T1] The buggy address belongs to the object at ffff88814b9d75c0
[   32.096840][    T1]  which belongs to the cache kmalloc-32 of size 32
[   32.097916][    T1] The buggy address is located 0 bytes inside of
[   32.097916][    T1]  32-byte region [ffff88814b9d75c0, ffff88814b9d75e0)
[   32.098895][    T1]
[   32.099143][    T1] The buggy address belongs to the physical page:
[   32.099656][    T1] page:00000000a3d33dcb refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14b9d7
[   32.100459][    T1] flags: 0x17ffffc0000200(slab|node=0|zone=2|lastcpupid=0x1fffff)
[   32.101113][    T1] raw: 0017ffffc0000200 0000000000000000 dead000000000122 ffff888100041500
[   32.101813][    T1] raw: 0000000000000000 0000000080400040 00000001ffffffff 0000000000000000
[   32.102518][    T1] page dumped because: kasan: bad access detected
[   32.103022][    T1] page_owner tracks the page as allocated
[   32.103496][    T1] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (systemd), ts 32049485962, free_ts 0
[ 32.104752][ T1] get_page_from_freelist (kbuild/src/x86_64-3/mm/page_alloc.c:2549 kbuild/src/x86_64-3/mm/page_alloc.c:4287) 
[ 32.105197][ T1] __alloc_pages (kbuild/src/x86_64-3/mm/page_alloc.c:5547) 
[ 32.105592][ T1] allocate_slab (kbuild/src/x86_64-3/mm/slub.c:1794 kbuild/src/x86_64-3/mm/slub.c:1939) 
[ 32.105988][ T1] ___slab_alloc (kbuild/src/x86_64-3/mm/slub.c:3180) 
[ 32.106385][ T1] __kmem_cache_alloc_node (kbuild/src/x86_64-3/mm/slub.c:3279 kbuild/src/x86_64-3/mm/slub.c:3364 kbuild/src/x86_64-3/mm/slub.c:3437) 
[ 32.106832][ T1] __kmalloc_node_track_caller (kbuild/src/x86_64-3/include/linux/kasan.h:211 kbuild/src/x86_64-3/mm/slab_common.c:955 kbuild/src/x86_64-3/mm/slab_common.c:975) 
[ 32.107304][ T1] copy_array (kbuild/src/x86_64-3/arch/x86/kernel/cpu/hypervisor.c:93) 
[ 32.107672][ T1] copy_verifier_state (kbuild/src/x86_64-3/kernel/bpf/verifier.c:1189) 
[ 32.108094][ T1] push_stack (kbuild/src/x86_64-3/kernel/bpf/verifier.c:1288) 
[ 32.108466][ T1] check_cond_jmp_op (kbuild/src/x86_64-3/kernel/bpf/verifier.c:10223) 
[ 32.108884][ T1] do_check (kbuild/src/x86_64-3/kernel/bpf/verifier.c:12451) 
[ 32.109259][ T1] do_check_common (kbuild/src/x86_64-3/kernel/bpf/verifier.c:14642) 
[ 32.109663][ T1] bpf_check (kbuild/src/x86_64-3/kernel/bpf/verifier.c:14705 kbuild/src/x86_64-3/kernel/bpf/verifier.c:15275) 
[ 32.110044][ T1] bpf_prog_load (kbuild/src/x86_64-3/kernel/bpf/syscall.c:2605) 
[ 32.110442][ T1] __sys_bpf (kbuild/src/x86_64-3/kernel/bpf/syscall.c:4965) 
[ 32.110815][ T1] __ia32_sys_bpf (kbuild/src/x86_64-3/kernel/bpf/syscall.c:5067) 

To reproduce:

        # build kernel
	cd linux
	cp config-6.1.0-rc1-00216-gd916d97f3395 .config
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install
	cd <mod-install-dir>
	find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email

        # if come across any failure that blocks the test,
        # please remove ~/.lkp and /lkp dir to run from a clean state.

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp