Commit 690b3bad authored by Tony Ambardar's avatar Tony Ambardar Committed by Tengda Wu
Browse files

libbpf: Fix output .symtab byte-order during linking 

mainline inclusion
from mainline-v6.12-rc7
commit f896b4a5399e97af0b451fcf04754ed316935674
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IB80HC

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f896b4a5399e97af0b451fcf04754ed316935674



--------------------------------

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: faf6ed32 ("libbpf: Add BPF static linker APIs")
Signed-off-by: default avatarTony Ambardar <tony.ambardar@gmail.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/87868bfeccf3f51aec61260073f8778e9077050a.1726475448.git.tony.ambardar@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarTengda Wu <wutengda2@huawei.com>
parent 429a1987

tools/lib/bpf/linker.c

+2 −0
Original line number Diff line number Diff line
@@ -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)