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[bpf-next] libbpf: Use OPTS_SET() macro in bpf_xdp_query()

Message ID 20240206125922.1992815-1-toke@redhat.com (mailing list archive)
State Accepted
Commit 92a871ab9fa59a74d013bc04f321026a057618e7
Delegated to: BPF
Headers show
Series [bpf-next] libbpf: Use OPTS_SET() macro in bpf_xdp_query() | expand

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Commit Message

Toke Høiland-Jørgensen Feb. 6, 2024, 12:59 p.m. UTC 
When the feature_flags and xdp_zc_max_segs fields were added to the libbpf
bpf_xdp_query_opts, the code writing them did not use the OPTS_SET() macro.
This causes libbpf to write to those fields unconditionally, which means
that programs compiled against an older version of libbpf (with a smaller
size of the bpf_xdp_query_opts struct) will have its stack corrupted by
libbpf writing out of bounds.

The patch adding the feature_flags field has an early bail out if the
feature_flags field is not part of the opts struct (via the OPTS_HAS)
macro, but the patch adding xdp_zc_max_segs does not. For consistency, this
fix just changes the assignments to both fields to use the OPTS_SET()
macro.

Fixes: 13ce2daa259a ("xsk: add new netlink attribute dedicated for ZC max frags")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 tools/lib/bpf/netlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org Feb. 6, 2024, 6 p.m. UTC | #1 
Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Tue,  6 Feb 2024 13:59:22 +0100 you wrote:
> When the feature_flags and xdp_zc_max_segs fields were added to the libbpf
> bpf_xdp_query_opts, the code writing them did not use the OPTS_SET() macro.
> This causes libbpf to write to those fields unconditionally, which means
> that programs compiled against an older version of libbpf (with a smaller
> size of the bpf_xdp_query_opts struct) will have its stack corrupted by
> libbpf writing out of bounds.
> 
> [...]

Here is the summary with links:
  - [bpf-next] libbpf: Use OPTS_SET() macro in bpf_xdp_query()
    https://git.kernel.org/bpf/bpf-next/c/92a871ab9fa5

You are awesome, thank you!
diff mbox series

Patch

diff --git a/tools/lib/bpf/netlink.c b/tools/lib/bpf/netlink.c
index 090bcf6e3b3d..68a2def17175 100644
--- a/tools/lib/bpf/netlink.c
+++ b/tools/lib/bpf/netlink.c
@@ -496,8 +496,8 @@  int bpf_xdp_query(int ifindex, int xdp_flags, struct bpf_xdp_query_opts *opts)
 	if (err)
 		return libbpf_err(err);
 
-	opts->feature_flags = md.flags;
-	opts->xdp_zc_max_segs = md.xdp_zc_max_segs;
+	OPTS_SET(opts, feature_flags, md.flags);
+	OPTS_SET(opts, xdp_zc_max_segs, md.xdp_zc_max_segs);
 
 skip_feature_flags:
 	return 0;