Yonghong Song d932a1a46b bpf: Support BTF_KIND_TYPE_TAG for btf_type_tag attributes ... LLVM patches ([1] for clang, [2] and [3] for BPF backend) added support for btf_type_tag attributes. This patch added support for the kernel. The main motivation for btf_type_tag is to bring kernel annotations __user, __rcu etc. to btf. With such information available in btf, bpf verifier can detect mis-usages and reject the program. For example, for __user tagged pointer, developers can then use proper helper like bpf_probe_read_user() etc. to read the data. BTF_KIND_TYPE_TAG may also useful for other tracing facility where instead of to require user to specify kernel/user address type, the kernel can detect it by itself with btf. [1] https://reviews.llvm.org/D111199 [2] https://reviews.llvm.org/D113222 [3] https://reviews.llvm.org/D113496 Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20211112012609.1505032-1-yhs@fb.com		2021-11-12 23:46:09 -08:00
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asm	AF_XDP: add xsk.{c,h} to Makefile and fix build	2019-03-05 09:22:54 -08:00
linux	include: add BPF_ALU32_IMM macro implementation	2021-11-01 15:10:25 -07:00
uapi/linux	bpf: Support BTF_KIND_TYPE_TAG for btf_type_tag attributes	2021-11-12 23:46:09 -08:00