[PATCH] libbpf: skip DWARF sections in linker sanity check

[Alyssa Ross <hi@alyssa.is>]

clang can generate (with -g -Wa,--compress-debug-sections) 4-byte
aligned DWARF sections that declare themselves to be 8-byte aligned in
the section header.  Since DWARF sections are dropped during linking
anyway, just skip running the sanity checks on them.

Reported-by: Sergei Trofimovich <slyich@gmail.com>
Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Closes: https://lore.kernel.org/bpf/ZXcFRJVKbKxtEL5t@nz.home/
Signed-off-by: Alyssa Ross <hi@alyssa.is>
---
 tools/lib/bpf/linker.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c
index 52a2901e8bd0..16bca56002ab 100644
--- a/tools/lib/bpf/linker.c
+++ b/tools/lib/bpf/linker.c
@@ -719,6 +719,9 @@ static int linker_sanity_check_elf(struct src_obj *obj)
 			return -EINVAL;
 		}
 
+		if (is_dwarf_sec_name(sec->sec_name))
+			continue;
+
 		if (sec->shdr->sh_addralign && !is_pow_of_2(sec->shdr->sh_addralign)) {
 			pr_warn("ELF section #%zu alignment %llu is non pow-of-2 alignment in %s\n",
 				sec->sec_idx, (long long unsigned)sec->shdr->sh_addralign,

base-commit: 733763285acfe8dffd6e39ad2ed3d1222b32a901
-- 
2.42.0