Donglin Peng cc5083d1f3 libbpf: Checking the btf_type kind when fixing variable offsets ... I encountered an issue when building the test_progs from the repository [1]: $ pwd /work/Qemu/x86_64/linux-6.10-rc2/tools/testing/selftests/bpf/ $ make test_progs V=1 [...] ./tools/sbin/bpftool gen object ./ip_check_defrag.bpf.linked2.o ./ip_check_defrag.bpf.linked1.o libbpf: failed to find symbol for variable 'bpf_dynptr_slice' in section '.ksyms' Error: failed to link './ip_check_defrag.bpf.linked1.o': No such file or directory (2) [...] Upon investigation, I discovered that the btf_types referenced in the '.ksyms' section had a kind of BTF_KIND_FUNC instead of BTF_KIND_VAR: $ bpftool btf dump file ./ip_check_defrag.bpf.linked1.o [...] [2] DATASEC '.ksyms' size=0 vlen=2 type_id=16 offset=0 size=0 (FUNC 'bpf_dynptr_from_skb') type_id=17 offset=0 size=0 (FUNC 'bpf_dynptr_slice') [...] [16] FUNC 'bpf_dynptr_from_skb' type_id=82 linkage=extern [17] FUNC 'bpf_dynptr_slice' type_id=85 linkage=extern [...] For a detailed analysis, please refer to [2]. We can add a kind checking to fix the issue. [1] https://github.com/eddyz87/bpf/tree/binsort-btf-dedup [2] https://lore.kernel.org/all/0c0ef20c-c05e-4db9-bad7-2cbc0d6dfae7@oracle.com/ Fixes: 8fd27bf69b ("libbpf: Add BPF static linker BTF and BTF.ext support") Signed-off-by: Donglin Peng <dolinux.peng@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Alan Maguire <alan.maguire@oracle.com> Acked-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/bpf/20240619122355.426405-1-dolinux.peng@gmail.com		2024-06-21 20:00:17 +02:00
..
api	tools api fs: Avoid reading whole file for a 1 byte bool	2023-11-30 19:25:19 -03:00
bpf	libbpf: Checking the btf_type kind when fixing variable offsets	2024-06-21 20:00:17 +02:00
perf	perf record: Fix comment misspellings	2024-04-26 22:13:10 -03:00
subcmd	tools lib subcmd: Show parent options in help	2024-05-12 21:09:52 -03:00
symbol	tools lib symbol: Add dependency test to install_headers	2022-12-14 11:16:12 -03:00
thermal	tools/lib/thermal: Fix include path for libnl3 in pkg-config file.	2023-02-15 17:29:40 +01:00
argv_split.c
bitmap.c	Bitmap patches for v6.0-rc1	2022-08-07 17:52:35 -07:00
ctype.c
find_bit.c	tools: sync find_bit() implementation	2022-09-21 12:21:44 -07:00
hweight.c
list_sort.c	tools lib: Adopt list_sort() from the kernel sources	2021-10-20 10:30:59 -03:00
rbtree.c	tools lib rbtree: pick some improvements from the kernel rbtree code	2024-05-08 08:41:27 -07:00
slab.c	tools: Move gfp.h and slab.h from radix-tree to lib	2022-02-20 08:44:37 +02:00
str_error_r.c
string.c	tools lib: Adopt memchr_inv() from kernel	2020-11-27 08:34:52 -03:00
vsprintf.c
zalloc.c	tools lib: Adopt zalloc()/zfree() from tools/perf	2019-07-09 10:13:26 -03:00