linux-kernel - [syzbot] [mm?] KASAN: out-of-bounds Read in copy_from_kernel

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Message-ID: <66faaa4e.050a0220.aab67.0032.GAE@google.com>
Date: Mon, 30 Sep 2024 06:40:30 -0700
From: syzbot <syzbot+61123a5daeb9f7454599@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [mm?] KASAN: out-of-bounds Read in copy_from_kernel_nofault

Hello,

syzbot found the following issue on:

HEAD commit:    cea5425829f7 Add linux-next specific files for 20240930
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14eccea9980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41a28720ed564c6a
dashboard link: https://syzkaller.appspot.com/bug?extid=61123a5daeb9f7454599
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/566995596f19/disk-cea54258.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e7c506c1c71d/vmlinux-cea54258.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7fcb4468b8c0/bzImage-cea54258.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+61123a5daeb9f7454599@...kaller.appspotmail.com

==================================================================
BUG: KASAN: out-of-bounds in instrument_memcpy_before include/linux/instrumented.h:163 [inline]
BUG: KASAN: out-of-bounds in copy_from_kernel_nofault+0x7a/0x2f0 mm/maccess.c:35
Read of size 6 at addr fffffffffffffffd by task syz.1.54/5558

CPU: 1 UID: 0 PID: 5558 Comm: syz.1.54 Not tainted 6.12.0-rc1-next-20240930-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_memcpy_before include/linux/instrumented.h:163 [inline]
 copy_from_kernel_nofault+0x7a/0x2f0 mm/maccess.c:35
 bpf_probe_read_kernel_common include/linux/bpf.h:2960 [inline]
 ____bpf_probe_read_kernel kernel/trace/bpf_trace.c:239 [inline]
 bpf_probe_read_kernel+0x2a/0x70 kernel/trace/bpf_trace.c:236
 bpf_prog_fe7b69aea4fa28bf+0x43/0x45
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run_xdp include/net/xdp.h:514 [inline]
 bpf_test_run+0x4b1/0xa90 net/bpf/test_run.c:431
 bpf_prog_test_run_xdp+0x7da/0x11e0 net/bpf/test_run.c:1319
 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4247
 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5652
 __do_sys_bpf kernel/bpf/syscall.c:5741 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5739 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5739
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5e6c17dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5e6d02a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5e6c335f80 RCX: 00007f5e6c17dff9
RDX: 000000000000003b RSI: 0000000020000240 RDI: 000000000000000a
RBP: 00007f5e6c1f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5e6c335f80 R15: 00007ffdc493ae58
 </TASK>

Memory state around the buggy address:
 fffffffffffffe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffffffffff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffffffffff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 5558 Comm: syz.1.54 Not tainted 6.12.0-rc1-next-20240930-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:kasan_metadata_fetch_row+0x12/0x30 mm/kasan/report_generic.c:186
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <48> 8b 0c 06 48 8b 44 06 08 48 89 47 08 48 89 0f c3 cc cc cc cc 66
RSP: 0018:ffffc900049976d8 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 78f03800465e2000
RDX: ffffc900045d9000 RSI: 0000000000000000 RDI: ffffc90004997710
RBP: ffffc90004997758 R08: ffffffff8bc0f2d3 R09: 0000000000000020
R10: dffffc0000000000 R11: fffff52000932ee1 R12: ffffc90004997710
R13: 0000000000000080 R14: ffffffffffffff80 R15: ffffc900049976f0
FS:  00007f5e6d02a6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558b7a5808 CR3: 000000003075e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 print_memory_metadata mm/kasan/report.c:464 [inline]
 print_report+0x4df/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_memcpy_before include/linux/instrumented.h:163 [inline]
 copy_from_kernel_nofault+0x7a/0x2f0 mm/maccess.c:35
 bpf_probe_read_kernel_common include/linux/bpf.h:2960 [inline]
 ____bpf_probe_read_kernel kernel/trace/bpf_trace.c:239 [inline]
 bpf_probe_read_kernel+0x2a/0x70 kernel/trace/bpf_trace.c:236
 bpf_prog_fe7b69aea4fa28bf+0x43/0x45
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run_xdp include/net/xdp.h:514 [inline]
 bpf_test_run+0x4b1/0xa90 net/bpf/test_run.c:431
 bpf_prog_test_run_xdp+0x7da/0x11e0 net/bpf/test_run.c:1319
 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4247
 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5652
 __do_sys_bpf kernel/bpf/syscall.c:5741 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5739 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5739
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5e6c17dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5e6d02a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5e6c335f80 RCX: 00007f5e6c17dff9
RDX: 000000000000003b RSI: 0000000020000240 RDI: 000000000000000a
RBP: 00007f5e6c1f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5e6c335f80 R15: 00007ffdc493ae58
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kasan_metadata_fetch_row+0x12/0x30 mm/kasan/report_generic.c:186
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <48> 8b 0c 06 48 8b 44 06 08 48 89 47 08 48 89 0f c3 cc cc cc cc 66
RSP: 0018:ffffc900049976d8 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 78f03800465e2000
RDX: ffffc900045d9000 RSI: 0000000000000000 RDI: ffffc90004997710
RBP: ffffc90004997758 R08: ffffffff8bc0f2d3 R09: 0000000000000020
R10: dffffc0000000000 R11: fffff52000932ee1 R12: ffffc90004997710
R13: 0000000000000080 R14: ffffffffffffff80 R15: ffffc900049976f0
FS:  00007f5e6d02a6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558b7a5808 CR3: 000000003075e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
   7:	00
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	66 0f 1f 00          	nopw   (%rax)
  1c:	48 c1 ee 03          	shr    $0x3,%rsi
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	48 8b 0c 06          	mov    (%rsi,%rax,1),%rcx <-- trapping instruction
  2e:	48 8b 44 06 08       	mov    0x8(%rsi,%rax,1),%rax
  33:	48 89 47 08          	mov    %rax,0x8(%rdi)
  37:	48 89 0f             	mov    %rcx,(%rdi)
  3a:	c3                   	ret
  3b:	cc                   	int3
  3c:	cc                   	int3
  3d:	cc                   	int3
  3e:	cc                   	int3
  3f:	66                   	data16


---
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