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Message-ID: <c9aff51d-918a-49d7-ae31-395cc6a5881b@oracle.com>
Date: Mon, 8 Jan 2024 23:01:36 +0530
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH v2 2/2] VMCI: Fix memcpy() run-time warning in
 dg_dispatch_as_host()
Content-Language: en-US
To: "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        Dan Carpenter <dan.carpenter@linaro.org>
Cc: linux-hardening@vger.kernel.org, keescook@chromium.org, error27@gmail.com,
        gustavoars@kernel.org, Bryan Tan <bryantan@vmware.com>,
        Vishnu Dasa <vdasa@vmware.com>,
        VMware PV-Drivers Reviewers <pv-drivers@vmware.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, vegard.nossum@oracle.com,
        darren.kenny@oracle.com, syzkaller <syzkaller@googlegroups.com>
References: <20240105164001.2129796-1-harshit.m.mogalapalli@oracle.com>
 <20240105164001.2129796-2-harshit.m.mogalapalli@oracle.com>
 <fc132bde-d42d-4aac-ba91-7a939a18091a@moroto.mountain>
 <7826922a-d642-424e-bede-bfc45be9254d@embeddedor.com>
From: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
In-Reply-To: <7826922a-d642-424e-bede-bfc45be9254d@embeddedor.com>
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Hi Gustavo,

On 08/01/24 10:33 pm, Gustavo A. R. Silva wrote:
> 
> 
> On 1/8/24 01:33, Dan Carpenter wrote:
>> On Fri, Jan 05, 2024 at 08:40:00AM -0800, Harshit Mogalapalli wrote:
>>> Syzkaller hit 'WARNING in dg_dispatch_as_host' bug.
>>>
>>> memcpy: detected field-spanning write (size 56) of single field 
>>> "&dg_info->msg"
>>> at drivers/misc/vmw_vmci/vmci_datagram.c:237 (size 24)
>>>
>>> WARNING: CPU: 0 PID: 1555 at drivers/misc/vmw_vmci/vmci_datagram.c:237
>>> dg_dispatch_as_host+0x88e/0xa60 
>>> drivers/misc/vmw_vmci/vmci_datagram.c:237
>>>
>>> Some code commentry, based on my understanding:
>>>
>>> 544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + 
>>> (size_t)(_dg)->payload_size)
>>> /// This is 24 + payload_size
>>>
>>> memcpy(&dg_info->msg, dg, dg_size);
>>>     Destination = dg_info->msg ---> this is a 24 byte
>>>                     structure(struct vmci_datagram)
>>>     Source = dg --> this is a 24 byte structure (struct vmci_datagram)
>>>     Size = dg_size = 24 + payload_size
>>>
>>> {payload_size = 56-24 =32} -- Syzkaller managed to set payload_size 
>>> to 32.
>>>
>>>   35 struct delayed_datagram_info {
>>>   36         struct datagram_entry *entry;
>>>   37         struct work_struct work;
>>>   38         bool in_dg_host_queue;
>>>   39         /* msg and msg_payload must be together. */
>>>   40         struct vmci_datagram msg;
>>>   41         u8 msg_payload[];
>>>   42 };
>>>
>>> So those extra bytes of payload are copied into msg_payload[], a run 
>>> time
>>> warning is seen while fuzzing with Syzkaller.
>>>
>>> One possible way to fix the warning is to split the memcpy() into
>>> two parts -- one -- direct assignment of msg and second taking care 
>>> of payload.
>>>
>>> Gustavo quoted:
>>> "Under FORTIFY_SOURCE we should not copy data across multiple members
>>> in a structure."
>>>
>>> Reported-by: syzkaller <syzkaller@googlegroups.com>
>>> Suggested-by: Vegard Nossum <vegard.nossum@oracle.com>
>>> Suggested-by: Gustavo A. R. Silva <gustavoars@kernel.org>
>>> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
>>> ---
>>> This patch is only tested with the C reproducer, not any testing
>>> specific to driver is done.
>>>
>>> v1->v2: ( Suggestions from Gustavo )
>>>          1. Change the commit message false positive --> legitimate
>>>             warning.
>>
>> The commit message is fine.
>>
>> Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
>>
>> But, I mean, it's not really "legitimate".  It meets the fortify source
>> heuristic, but it's still a false positive.  Fortify source is
>> *supposed* to find memory corruption bugs and this is not a memory
>> corruption bug.  It's just that these days we have to treat foritify
>> false positives as crashing bugs because people enable it and we have to
>> fix it.
>>
>> Let's not pretend that fortify has helped us in this situation, it has
>> caused us a problem.  It has taken valid code and created a crashing
>> bug.  I'm not saying that the cost isn't worth it, but let's not pretend.
>>
> 
> It's a "legitimate warning" (which differs from a "legitimate memory
> corruption bug") in the sense that the feature is doing what it's
> supposed to do: reporting a write beyond the boundaries of a field/member
> in a structure.
> 
> Is that simple.  I don't see the "pretense" here.
> 
> BTW, is this _warning_ really causing a crash?
> 

I think we can say this can cause a crash in a way, WARN_ONCE() is still 
a WARNING and we can have systems with panic_on_warn set.

Eg: on how a crash would look like when panic_on_warn is set.

[  173.803078] ------------[ cut here ]------------
[  173.806961] memcpy: detected field-spanning write (size 56) of single 
field "&dg_info->msg" at drivers/misc/vmw_vmci/vmci_datagram.c:237 (size 24)
[  173.817612] WARNING: CPU: 4 PID: 9003 at 
drivers/misc/vmw_vmci/vmci_datagram.c:237 dg_dispatch_as_host+0x88e/0xa60
[  173.826031] Modules linked in:
[  173.828765] CPU: 4 PID: 9003 Comm: r Not tainted 6.7.0-rc7 #6
[  173.833502] Hardware name: Red Hat KVM, BIOS 1.16.1-1.el9 04/01/2014
[  173.838689] RIP: 0010:dg_dispatch_as_host+0x88e/0xa60
[  173.842953] Code: fe ff ff e8 a4 61 70 fa b9 18 00 00 00 48 89 de 48 
c7 c2 e0 c8 20 92 48 c7 c7 60 c9 20 92 c6 05 e3 62 22 12 01 e8 92 c2 38 
fa <0f> 0b e9 82 fe ff ff e8 76 61 70 fa e8 71 61 70 fa 48 8d 7d 0c 48
[  173.857632] RSP: 0018:ffff88810362fb10 EFLAGS: 00010246
[  173.862078] RAX: 0000000000000000 RBX: 0000000000000038 RCX: 
0000000000000000
[  173.867885] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
0000000000000000
[  173.873689] RBP: ffff888118f94680 R08: 0000000000000000 R09: 
0000000000000000
[  173.879503] R10: 0000000000000000 R11: 0000000000000000 R12: 
ffff888118f71130
[  173.885317] R13: ffff888118f71100 R14: 0000000000000000 R15: 
0000000000000000
[  173.891124] FS:  00007fced2868740(0000) GS:ffff8881f4200000(0000) 
knlGS:0000000000000000
[  173.897658] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  173.902397] CR2: 0000000020000000 CR3: 00000001198d2000 CR4: 
00000000000006f0
[  173.908222] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[  173.914073] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
[  173.919901] Call Trace:
[  173.922117]  <TASK>
[  173.924075]  ? show_regs+0x9b/0xb0
[  173.927151]  ? __warn+0xeb/0x2c0
[  173.929981]  ? dg_dispatch_as_host+0x88e/0xa60
[  173.933769]  ? report_bug+0x313/0x410
[  173.937010]  ? dg_dispatch_as_host+0x88e/0xa60
[  173.940804]  ? handle_bug+0x9d/0x130
[  173.943922]  ? exc_invalid_op+0x36/0x80
[  173.947195]  ? asm_exc_invalid_op+0x1a/0x20
[  173.950768]  ? dg_dispatch_as_host+0x88e/0xa60
[  173.954524]  vmci_datagram_dispatch+0x1da/0x230
[  173.958368]  ? __pfx_vmci_datagram_dispatch+0x10/0x10
[  173.962583]  vmci_datagram_send+0x2d/0x50
[  173.966006]  vmci_transport_dgram_enqueue+0x2e2/0x410
[  173.970228]  ? __pfx_vmci_transport_dgram_allow+0x10/0x10
[  173.974689]  vsock_dgram_sendmsg+0x391/0x610
[  173.978336]  ? __pfx_vsock_dgram_sendmsg+0x10/0x10
[  173.982568]  __sys_sendto+0x4dc/0x540
[  173.985767]  ? __pfx___sys_sendto+0x10/0x10
[  173.989289]  ? __pfx_vsock_dgram_connect+0x10/0x10
[  173.993312]  ? selinux_netlbl_socket_connect+0x37/0x50
[  173.997588]  ? selinux_socket_connect+0x76/0xa0
[  174.001449]  ? __sys_connect_file+0x5d/0x1b0
[  174.005078]  ? __sys_connect+0x113/0x1b0
[  174.008420]  ? __pfx___sys_connect+0x10/0x10
[  174.012031]  ? count_memcg_events.constprop.0+0x48/0x60
[  174.016346]  ? handle_mm_fault+0x2c8/0x910
[  174.019797]  ? ktime_get_coarse_real_ts64+0xa0/0xf0
[  174.023862]  ? __audit_syscall_entry+0x393/0x4f0
[  174.027769]  __x64_sys_sendto+0xe9/0x1d0
[  174.031090]  ? syscall_trace_enter.constprop.0+0x138/0x1b0
[  174.035604]  do_syscall_64+0x45/0x100
[  174.038765]  entry_SYSCALL_64_after_hwframe+0x6e/0x76
[  174.042953] RIP: 0033:0x7fced220eca3
[  174.046040] Code: 48 8b 0d 08 83 20 00 f7 d8 64 89 01 48 83 c8 ff c3 
66 0f 1f 44 00 00 83 3d 49 c7 20 00 00 75 13 49 89 ca b8 2c 00 00 00 0f 
05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 2b f7 ff ff 48 89 04 24
[  174.060689] RSP: 002b:00007ffe5f77d2e8 EFLAGS: 00000246 ORIG_RAX: 
000000000000002c
[  174.066898] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 
00007fced220eca3
[  174.072766] RDX: 0000000000000020 RSI: 00007ffe5f77d400 RDI: 
0000000000000004
[  174.078573] RBP: 00007ffe5f77d330 R08: 00007ffe5f77d310 R09: 
000000000000000c
[  174.084376] R10: 0000000000000000 R11: 0000000000000246 R12: 
0000000000400730
[  174.090185] R13: 00007ffe5f77e520 R14: 0000000000000000 R15: 
0000000000000000
[  174.096014]  </TASK>
[  174.098021] Kernel panic - not syncing: kernel: panic_on_warn set ...
[  174.101976] CPU: 4 PID: 9003 Comm: r Not tainted 6.7.0-rc7 #6
[  174.107921] Hardware name: Red Hat KVM, BIOS 1.16.1-1.el9 04/01/2014
[  174.112923] Call Trace:
[  174.113973]  <TASK>
[  174.115922]  dump_stack_lvl+0x83/0xb0
[  174.117975]  panic+0x697/0x720
[  174.121972]  ? show_trace_log_lvl+0x3bb/0x520
[  174.125942]  ? __pfx_panic+0x10/0x10
[  174.128925]  ? dg_dispatch_as_host+0x88e/0xa60
[  174.131924]  check_panic_on_warn+0xb6/0xc0
[  174.133970]  __warn+0xf7/0x2c0
[  174.137970]  ? dg_dispatch_as_host+0x88e/0xa60
[  174.141970]  report_bug+0x313/0x410
[  174.144924]  ? dg_dispatch_as_host+0x88e/0xa60
[  174.148898]  handle_bug+0x9d/0x130
[  174.149968]  exc_invalid_op+0x36/0x80
[  174.153969]  asm_exc_invalid_op+0x1a/0x20
[  174.157970] RIP: 0010:dg_dispatch_as_host+0x88e/0xa60
[  174.161970] Code: fe ff ff e8 a4 61 70 fa b9 18 00 00 00 48 89 de 48 
c7 c2 e0 c8 20 92 48 c7 c7 60 c9 20 92 c6 05 e3 62 22 12 01 e8 92 c2 38 
fa <0f> 0b e9 82 fe ff ff e8 76 61 70 fa e8 71 61 70 fa 48 8d 7d 0c 48
[  174.176923] RSP: 0018:ffff88810362fb10 EFLAGS: 00010246
[  174.179922] RAX: 0000000000000000 RBX: 0000000000000038 RCX: 
0000000000000000
[  174.185967] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
0000000000000000
[  174.189966] RBP: ffff888118f94680 R08: 0000000000000000 R09: 
0000000000000000
[  174.197968] R10: 0000000000000000 R11: 0000000000000000 R12: 
ffff888118f71130
[  174.201969] R13: ffff888118f71100 R14: 0000000000000000 R15: 
0000000000000000
[  174.208924]  vmci_datagram_dispatch+0x1da/0x230
[  174.212884]  ? __pfx_vmci_datagram_dispatch+0x10/0x10
[  174.216923]  vmci_datagram_send+0x2d/0x50
[  174.219924]  vmci_transport_dgram_enqueue+0x2e2/0x410
[  174.221966]  ? __pfx_vmci_transport_dgram_allow+0x10/0x10
[  174.227939]  vsock_dgram_sendmsg+0x391/0x610
[  174.230883]  ? __pfx_vsock_dgram_sendmsg+0x10/0x10
[  174.236021]  __sys_sendto+0x4dc/0x540
[  174.237970]  ? __pfx___sys_sendto+0x10/0x10
[  174.241968]  ? __pfx_vsock_dgram_connect+0x10/0x10
[  174.245969]  ? selinux_netlbl_socket_connect+0x37/0x50
[  174.249969]  ? selinux_socket_connect+0x76/0xa0
[  174.253968]  ? __sys_connect_file+0x5d/0x1b0
[  174.257966]  ? __sys_connect+0x113/0x1b0
[  174.259923]  ? __pfx___sys_connect+0x10/0x10
[  174.264922]  ? count_memcg_events.constprop.0+0x48/0x60
[  174.267947]  ? handle_mm_fault+0x2c8/0x910
[  174.269966]  ? ktime_get_coarse_real_ts64+0xa0/0xf0
[  174.275924]  ? __audit_syscall_entry+0x393/0x4f0
[  174.277970]  __x64_sys_sendto+0xe9/0x1d0
[  174.281972]  ? syscall_trace_enter.constprop.0+0x138/0x1b0
[  174.285970]  do_syscall_64+0x45/0x100
[  174.289966]  entry_SYSCALL_64_after_hwframe+0x6e/0x76
[  174.293967] RIP: 0033:0x7fced220eca3
[  174.297970] Code: 48 8b 0d 08 83 20 00 f7 d8 64 89 01 48 83 c8 ff c3 
66 0f 1f 44 00 00 83 3d 49 c7 20 00 00 75 13 49 89 ca b8 2c 00 00 00 0f 
05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 2b f7 ff ff 48 89 04 24
[  174.311883] RSP: 002b:00007ffe5f77d2e8 EFLAGS: 00000246 ORIG_RAX: 
000000000000002c
[  174.317968] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 
00007fced220eca3
[  174.323930] RDX: 0000000000000020 RSI: 00007ffe5f77d400 RDI: 
0000000000000004
[  174.329968] RBP: 00007ffe5f77d330 R08: 00007ffe5f77d310 R09: 
000000000000000c
[  174.333967] R10: 0000000000000000 R11: 0000000000000246 R12: 
0000000000400730
[  174.340923] R13: 00007ffe5f77e520 R14: 0000000000000000 R15: 
0000000000000000
[  174.345969]  </TASK>
[  174.348922] Dumping ftrace buffer:
[  174.348922]    (ftrace buffer empty)
[  174.348922] Kernel Offset: disabled
[  174.348922] Rebooting in 86400 seconds..


Thanks,
Harshit


> Thanks
> -- 
> Gustavo
>