linux-kernel - [syzbot] general protection fault in binder_alloc_new

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Date:   Sat, 20 Aug 2022 23:04:26 -0700
From:   syzbot <syzbot+f7dc54e5be28950ac459@...kaller.appspotmail.com>
To:     arve@...roid.com, brauner@...nel.org, cmllamas@...gle.com,
        gregkh@...uxfoundation.org, joel@...lfernandes.org,
        linux-kernel@...r.kernel.org, maco@...roid.com, surenb@...gle.com,
        syzkaller-bugs@...glegroups.com, tkjos@...roid.com
Subject: [syzbot] general protection fault in binder_alloc_new_buf

Hello,

syzbot found the following issue on:

HEAD commit:    8755ae45a9e8 Add linux-next specific files for 20220819
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12a879e3080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ead6107a3bbe3c62
dashboard link: https://syzkaller.appspot.com/bug?extid=f7dc54e5be28950ac459
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1114a92d080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17693aa5080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f7dc54e5be28950ac459@...kaller.appspotmail.com

binder: 3755:3755 ioctl c0306201 20001480 returned -14
general protection fault, probably for non-canonical address 0xdffffc0000000025: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000128-0x000000000000012f]
CPU: 0 PID: 3755 Comm: syz-executor229 Not tainted 6.0.0-rc1-next-20220819-syzkaller #0
syz-executor229[3755] cmdline: ./syz-executor2294415195
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:__lock_acquire+0xd83/0x56d0 kernel/locking/lockdep.c:4923
Code: 9b 0e 41 bf 01 00 00 00 0f 86 c8 00 00 00 89 05 63 56 9b 0e e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 4e 31 00 00 49 81 3e 60 84 51 8f 0f 84 4c f3 ff
RSP: 0018:ffffc90003c1f268 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 1ffff92000783e7c RCX: 0000000000000001
RDX: 0000000000000025 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: fffffbfff1bbd792 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807a289d80 R14: 0000000000000128 R15: 0000000000000001
FS:  0000555556fed300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa1152711f0 CR3: 0000000072080000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5666 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
 down_read+0x98/0x450 kernel/locking/rwsem.c:1499
 mmap_read_lock include/linux/mmap_lock.h:117 [inline]
 binder_alloc_new_buf_locked drivers/android/binder_alloc.c:405 [inline]
 binder_alloc_new_buf+0xa5/0x19e0 drivers/android/binder_alloc.c:593
 binder_transaction+0x242e/0x9a80 drivers/android/binder.c:3199
 binder_thread_write+0x664/0x3220 drivers/android/binder.c:3986
 binder_ioctl_write_read drivers/android/binder.c:5036 [inline]
 binder_ioctl+0x3470/0x6d00 drivers/android/binder.c:5323
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa1151fd439
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc9354bf38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fa1151fd439
RDX: 0000000020000380 RSI: 00000000c0306201 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000001526ae40 R09: 000000001526ae40
R10: 000000001526ae40 R11: 0000000000000246 R12: 000000000000c3f0
R13: 00007ffc9354bf60 R14: 00007ffc9354bf50 R15: 00007ffc9354bf44
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__lock_acquire+0xd83/0x56d0 kernel/locking/lockdep.c:4923
Code: 9b 0e 41 bf 01 00 00 00 0f 86 c8 00 00 00 89 05 63 56 9b 0e e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 4e 31 00 00 49 81 3e 60 84 51 8f 0f 84 4c f3 ff
RSP: 0018:ffffc90003c1f268 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 1ffff92000783e7c RCX: 0000000000000001
RDX: 0000000000000025 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: fffffbfff1bbd792 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807a289d80 R14: 0000000000000128 R15: 0000000000000001
FS:  0000555556fed300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa1152711f0 CR3: 0000000072080000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	41 bf 01 00 00 00    	mov    $0x1,%r15d
   6:	0f 86 c8 00 00 00    	jbe    0xd4
   c:	89 05 63 56 9b 0e    	mov    %eax,0xe9b5663(%rip)        # 0xe9b5675
  12:	e9 bd 00 00 00       	jmpq   0xd4
  17:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1e:	fc ff df
  21:	4c 89 f2             	mov    %r14,%rdx
  24:	48 c1 ea 03          	shr    $0x3,%rdx
* 28:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2c:	0f 85 4e 31 00 00    	jne    0x3180
  32:	49 81 3e 60 84 51 8f 	cmpq   $0xffffffff8f518460,(%r14)
  39:	0f                   	.byte 0xf
  3a:	84 4c f3 ff          	test   %cl,-0x1(%rbx,%rsi,8)


---
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