libbpf: Fix output .symtab byte-order during linking

JIRA: https://issues.redhat.com/browse/RHEL-85485

commit f896b4a
Author: Tony Ambardar <tony.ambardar@gmail.com>
Date:   Mon Sep 16 01:37:42 2024 -0700

    libbpf: Fix output .symtab byte-order during linking

    Object linking output data uses the default ELF_T_BYTE type for '.symtab'
    section data, which disables any libelf-based translation. Explicitly set
    the ELF_T_SYM type for output to restore libelf's byte-order conversion,
    noting that input '.symtab' data is already correctly translated.

    Fixes: faf6ed3 ("libbpf: Add BPF static linker APIs")
    Signed-off-by: Tony Ambardar <tony.ambardar@gmail.com>
    Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
    Link: https://lore.kernel.org/bpf/87868bfeccf3f51aec61260073f8778e9077050a.1726475448.git.tony.ambardar@gmail.com
    Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Signed-off-by: Viktor Malik <vmalik@redhat.com>

Author: viktormalik

tools/lib/bpf/linker.c

@@ -396,6 +396,8 @@ static int init_output_elf(struct bpf_linker *linker, const char *file)
 		pr_warn_elf("failed to create SYMTAB data");
 		return -EINVAL;
 	}
+	/* Ensure libelf translates byte-order of symbol records */
+	sec->data->d_type = ELF_T_SYM;
 
 	str_off = strset__add_str(linker->strtab_strs, sec->sec_name);
 	if (str_off < 0)