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A flaw was found in unrestricted eBPF usage by the BPF_BTF_LOAD, leading to a possible out-of-bounds memory write in the Linux kernel’s BPF subsystem due to the way a user loads BTF. This flaw allows a local user to crash or escalate their privileges on the system.
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回合社区补丁，https://lore.kernel.org/all/20211217003152.48334-1-haoluo@google.com
测试结果：
#./test_progs -t ksyms_btf
#44/1 basic:OK
#44/2 null_check:OK
#44/3 write_check:OK
#44 ksyms_btf:OK
Summary: 1/3 PASSED, 0 SKIPPED, 0 FAILED
#./test_verifier
...
#1185/p XDP pkt read, pkt_data <= pkt_meta', good access OK
#1186/p XDP pkt read, pkt_data <= pkt_meta', corner case -1, bad access OK
#1187/p XDP pkt read, pkt_data <= pkt_meta', bad access 2 OK
#1188/p XDP pkt read, pkt_data <= pkt_meta', corner case, good access OK
#1189/p XDP pkt read, pkt_data <= pkt_meta', corner case +1, good access OK
Summary: 1732 PASSED, 0 SKIPPED, 0 FAILED
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