From 812d8bf87678f77055b575d20636fdbbbf15edaf Mon Sep 17 00:00:00 2001 From: Alyssa Ross Date: Tue, 19 Dec 2023 12:03:24 +0100 Subject: [PATCH] libbpf: Skip DWARF sections in linker sanity check 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 Suggested-by: Andrii Nakryiko Signed-off-by: Alyssa Ross Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Acked-by: Daniel Borkmann Closes: https://lore.kernel.org/bpf/ZXcFRJVKbKxtEL5t@nz.home/ Link: https://lore.kernel.org/bpf/20231219110324.8989-1-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 52a2901e8bd0ec..16bca56002ab35 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,