ebpf_link_get_info accesses attach_data without holding the lock

[Alan-Jowett]

0: kd> k
  *** Stack trace for last set context - .thread/.cxr resets it
 # Child-SP          RetAddr               Call Site
00 ffff828f`1f651530 fffff801`e255b141     eBPFCore!ebpf_link_get_info+0x390 [E:\ebpf-for-windows\libs\execution_context\ebpf_link.c @ 462] 
01 ffff828f`1f651710 fffff801`e25578a1     eBPFCore!_ebpf_core_find_matching_link+0x101 [E:\ebpf-for-windows\libs\execution_context\ebpf_core.c @ 1264] 
02 ffff828f`1f651860 fffff801`e255cd28     eBPFCore!_ebpf_core_protocol_unlink_program+0x1a1 [E:\ebpf-for-windows\libs\execution_context\ebpf_core.c @ 1329] 
03 ffff828f`1f6519a0 fffff801`e2553699     eBPFCore!ebpf_core_invoke_protocol_handler+0x288 [E:\ebpf-for-windows\libs\execution_context\ebpf_core.c @ 2423] 
04 ffff828f`1f651a60 fffff806`601a8f93     eBPFCore!_ebpf_driver_io_device_control+0x8e9 [E:\ebpf-for-windows\ebpfcore\ebpf_drv.c @ 329] 
05 (Inline Function) --------`--------     Wdf01000!FxIoQueueIoDeviceControl::Invoke+0x42 [minkernel\wdf\framework\shared\inc\private\common\FxIoQueueCallbacks.hpp @ 226] 
06 ffff828f`1f651de0 fffff806`601a8960     Wdf01000!FxIoQueue::DispatchRequestToDriver+0x163 [minkernel\wdf\framework\shared\irphandlers\io\fxioqueue.cpp @ 3325] 
07 ffff828f`1f651e80 fffff806`601a5d4e     Wdf01000!FxIoQueue::DispatchEvents+0x520 [minkernel\wdf\framework\shared\irphandlers\io\fxioqueue.cpp @ 3125] 
08 ffff828f`1f651f50 fffff806`601a77d7     Wdf01000!FxIoQueue::QueueRequest+0xae [minkernel\wdf\framework\shared\irphandlers\io\fxioqueue.cpp @ 2371] 
09 (Inline Function) --------`--------     Wdf01000!FxPkgIo::DispatchStep2+0x5ac [minkernel\wdf\framework\shared\irphandlers\io\fxpkgio.cpp @ 469] 
0a ffff828f`1f651fc0 fffff806`601a719d     Wdf01000!FxPkgIo::DispatchStep1+0x627 [minkernel\wdf\framework\shared\irphandlers\io\fxpkgio.cpp @ 324] 
0b ffff828f`1f652080 fffff806`601aa867     Wdf01000!FxPkgIo::Dispatch+0x5d [minkernel\wdf\framework\shared\irphandlers\io\fxpkgio.cpp @ 119] 
0c (Inline Function) --------`--------     Wdf01000!DispatchWorker+0x6b [minkernel\wdf\framework\shared\core\fxdevice.cpp @ 1589] 
0d (Inline Function) --------`--------     Wdf01000!FxDevice::Dispatch+0x89 [minkernel\wdf\framework\shared\core\fxdevice.cpp @ 1603] 
0e ffff828f`1f6520e0 fffff806`5eb73b67     Wdf01000!FxDevice::DispatchWithLock+0x157 [minkernel\wdf\framework\shared\core\fxdevice.cpp @ 1447] 
0f ffff828f`1f652140 fffff806`5f1c7f0a     nt!IopfCallDriver+0x53 [minkernel\ntos\io\iomgr\iomgr.h @ 3394] 
10 ffff828f`1f652180 fffff806`5ec2b301     nt!IovCallDriver+0x266 [minkernel\ntos\io\iomgr\ioverifier.c @ 589] 
11 ffff828f`1f6521c0 fffff806`5ee1b4c8     nt!IofCallDriver+0x1fbca1 [minkernel\ntos\io\iomgr\iosubs.c @ 3157] 
12 (Inline Function) --------`--------     nt!IoCallDriverWithTracing+0x2b [minkernel\ntos\io\iomgr\iomgr.h @ 1171] 
13 (Inline Function) --------`--------     nt!IopCallDriverReference+0xbd [minkernel\ntos\io\iomgr\iomgr.h @ 4234] 
14 ffff828f`1f652200 fffff806`5ee1b2c7     nt!IopSynchronousServiceTail+0x1a8 [minkernel\ntos\io\iomgr\internal.c @ 8878] 
15 ffff828f`1f6522a0 fffff806`5ee1a646     nt!IopXxxControlFile+0xc67 [minkernel\ntos\io\iomgr\internal.c @ 11568] 
16 ffff828f`1f6523e0 fffff806`5ec0fab5     nt!NtDeviceIoControlFile+0x56 [minkernel\ntos\io\iomgr\devctrl.c @ 110] 
17 ffff828f`1f652450 00007ff8`ae48d1a4     nt!KiSystemServiceCopyEnd+0x25 [minkernel\ntos\ke\amd64\trap.asm @ 3469] 
18 00000056`7e6ff098 00007ff8`abf0572b     ntdll!ZwDeviceIoControlFile+0x14 [minkernel\ntdll\daytona\objfre\amd64\usrstubs.asm @ 235] 
19 00000056`7e6ff0a0 00007ff8`ac735611     KERNELBASE!DeviceIoControl+0x6b [minkernel\kernelbase\filehops.c @ 3496] 
1a 00000056`7e6ff110 00007ff8`8a68caa3     KERNEL32!DeviceIoControlImplementation+0x81 [clientcore\base\win32\client\filehops.c @ 157] 
1b 00000056`7e6ff160 00000000`00000000     EbpfApi!Platform::DeviceIoControl+0x63 [E:\ebpf-for-windows\libs\thunk\windows\platform.cpp @ 50]