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libbpf: Add enum64 sanitization

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When old kernel does not support enum64 but user space btf
contains non-zero enum kflag or enum64, libbpf needs to
do proper sanitization so modified btf can be accepted
by the kernel.

Sanitization for enum kflag can be achieved by clearing
the kflag bit. For enum64, the type is replaced with an
union of integer member types and the integer member size
must be smaller than enum64 size. If such an integer
type cannot be found, a new type is created and used
for union members.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20220607062636.3721375-1-yhs@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song
2022-06-06 23:26:36 -07:00
committed by Andrii Nakryiko
parent f429a582bf
commit a945df2439
3 changed files with 56 additions and 5 deletions
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3
src/btf.h
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@@ -395,9 +395,10 @@ btf_dump__dump_type_data(struct btf_dump *d, __u32 id,
#ifndef BTF_KIND_FLOAT
#define BTF_KIND_FLOAT 16 /* Floating point */
#endif
/* The kernel header switched to enums, so these two were never #defined */
/* The kernel header switched to enums, so the following were never #defined */
#define BTF_KIND_DECL_TAG 17 /* Decl Tag */
#define BTF_KIND_TYPE_TAG 18 /* Type Tag */
#define BTF_KIND_ENUM64 19 /* Enum for up-to 64bit values */
static inline __u16 btf_kind(const struct btf_type *t)
{