Andrii Nakryiko 441420a1f0 bpf: Reliably preserve btf_trace_xxx types ... btf_trace_xxx types, crucial for tp_btf BPF programs (raw tracepoint with verifier-checked direct memory access), have to be preserved in kernel BTF to allow verifier do its job and enforce type/memory safety. It was reported ([0]) that for kernels built with Clang current type-casting approach doesn't preserve these types. This patch fixes it by declaring an anonymous union for each registered tracepoint, capturing both struct bpf_raw_event_map information, as well as recording btf_trace_##call type reliably. Structurally, it's still the same content as for a plain struct bpf_raw_event_map, so no other changes are necessary. [0] https://github.com/iovisor/bcc/issues/2770#issuecomment-591007692 Fixes: e8c423fb31 ("bpf: Add typecast to raw_tracepoints to help BTF generation") Reported-by: Wenbo Zhang <ethercflow@gmail.com> Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20200301081045.3491005-2-andriin@fb.com		2020-03-02 16:49:55 -08:00
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events	ARM: SoC-related driver updates	2020-02-08 14:04:19 -08:00
bpf_probe.h	bpf: Reliably preserve btf_trace_xxx types	2020-03-02 16:49:55 -08:00
define_trace.h	tracing: introduce TRACE_EVENT_NOP()	2019-04-08 09:22:51 -04:00
perf.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-11-04 09:26:51 +09:00
syscall.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
trace_events.h	Tracing updates:	2020-02-06 07:12:11 +00:00