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bpftool: Fix truncated netlink dumps

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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>
This commit is contained in:
Jakub Kicinski
2026-02-17 11:41:50 -08:00
committed by Andrii Nakryiko
parent 6314de34ef
commit 7155e8e234
1 changed files with 3 additions and 1 deletions
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4
src/netlink.c
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@@ -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: