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libbpf: Add explicit padding to bpf_xdp_set_link_opts

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[ Upstream commit dde7b3f5f2f458297aeccfd4783e53ab8ca046db ]

Adding such anonymous padding fixes the issue with uninitialized portions of
bpf_xdp_set_link_opts when using LIBBPF_DECLARE_OPTS macro with inline field
initialization:

DECLARE_LIBBPF_OPTS(bpf_xdp_set_link_opts, opts, .old_fd = -1);

When such code is compiled in debug mode, compiler is generating code that
leaves padding bytes uninitialized, which triggers error inside libbpf APIs
that do strict zero initialization checks for OPTS structs.

Adding anonymous padding field fixes the issue.

Fixes: bd5ca3ef93 ("libbpf: Add function to set link XDP fd while specifying old program")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210313210920.1959628-2-andrii@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrii Nakryiko 2021-03-13 13:09:17 -08:00 committed by Greg Kroah-Hartman
parent f72e3d81c6
commit b1ed7a5717
1 changed files with 1 additions and 0 deletions
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tools/lib/bpf/libbpf.h
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@ -507,6 +507,7 @@ struct xdp_link_info {
struct bpf_xdp_set_link_opts {
size_t sz;
int old_fd;
size_t :0;
};
#define bpf_xdp_set_link_opts__last_field old_fd