diff options
| author | Jakub Kicinski <kuba@kernel.org> | 2026-02-17 11:41:50 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-02-26 14:59:39 -0800 |
| commit | 5c939ebbd72f4e3ae6d1426afa243c1ffa5877f8 (patch) | |
| tree | 8284711ef6d86ecea2128776bca463a0bd67a4d1 /tools/lib | |
| parent | 71b5fc8e8e17eace1304cec7d080e56a6c2d507d (diff) | |
bpftool: Fix truncated netlink dumps
[ Upstream commit 3b39d73cc3379360a33eb583b17f21fe55e1288e ]
Netlink requires that the recv buffer used during dumps is at least
min(PAGE_SIZE, 8k) (see the man page). Otherwise the messages will
get truncated. Make sure bpftool follows this requirement, avoid
missing information on systems with large pages.
Acked-by: Quentin Monnet <qmo@kernel.org>
Fixes: 7084566a236f ("tools/bpftool: Remove libbpf_internal.h usage in bpftool")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20260217194150.734701-1-kuba@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/bpf/netlink.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/lib/bpf/netlink.c b/tools/lib/bpf/netlink.c index c997e69d507f..c9a78fb16f11 100644 --- a/tools/lib/bpf/netlink.c +++ b/tools/lib/bpf/netlink.c @@ -143,7 +143,7 @@ static int libbpf_netlink_recv(int sock, __u32 nl_pid, int seq, struct nlmsghdr *nh; int len, ret; - ret = alloc_iov(&iov, 4096); + ret = alloc_iov(&iov, 8192); if (ret) goto done; @@ -212,6 +212,8 @@ start: } } } + if (len) + pr_warn("Invalid message or trailing data in Netlink response: %d bytes left\n", len); } ret = 0; done: |