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[CORE-10546] Change rpm install order to fix 'undefined symbol: xtables_strdup' #9022

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merged 3 commits into from
Jul 19, 2024

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microdnf install iproute-tc nftables would install iptables-libs 1.8.5-11.el8_9 as a dependency, and it provides /lib64/libxtables.so.12.3.0. When using that .so file with LD_PRELOAD, we can consistently reproduce the issue:

# LD_PRELOAD=/lib64/libxtables.so.12.3.0 iptables-legacy-save
iptables-legacy-save: symbol lookup error: iptables-legacy-save: undefined symbol: xtables_strdup

The problem was, during our build process, we build iptables (and iptables-libs) v1.8.8 and install with rpm --force, but that doesn´t remove the outdated v1.8.5. By moving things around in the Dockerfiles and installing iptables-libs 1.8.8 before iproute-tc and nftables, the problematic 1.8.5 package is no longer installed and thus the correct .so file should be used (libxtables.so.12.6.0 at the time of writing this).

Description

Related issues/PRs

fixes #8831 (tentatively, pending user confirmation)

Todos

  • Tests
  • Documentation
  • Release note

Release Note

Fix 'undefined symbol: xtables_strdup' error when running 'iptables-legacy-save' in the calico-node image.

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…es_strdup'

`microdnf install iproute-tc nftables` would install `iptables-libs` 1.8.5-11.el8_9 as a dependency, and it provides `/lib64/libxtables.so.12.3.0`. When using that `.so` file with `LD_PRELOAD`, we can consistently reproduce the issue:

```
LD_PRELOAD=/lib64/libxtables.so.12.3.0 iptables-legacy-save
iptables-legacy-save: symbol lookup error: iptables-legacy-save: undefined symbol: xtables_strdup
```

The problem was, during our build process, we build iptables (and iptables-libs) v1.8.8 and install with `rpm --force`, but that doesn´t remove the outdated v1.8.5. By moving things around in the Dockerfiles and installing iptables-libs 1.8.8 before iproute-tc and nftables, the problematic 1.8.5 package is no longer installed and thus the correct `.so` file should be used (`libxtables.so.12.6.0` at the time of writing this).
@jonathan-hurley
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I can confirm that this resolves the issue with xtables_strdup.

# Install compatible libnftnl version with selected iptables version
rpm -i /tmp/rpms/iptables-legacy-${IPTABLES_VER}.el8.2.x86_64.rpm && \
# Install iptables-libs via rpm. The libs must installed before installing iproute-tc and nftables via 'microdnf install'
# otherwise they will pull an outdated version of iptables-libs (1.8.5-11.el8_9) as a dependency.
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1.8.5-11.el8_9 version number may change in the future. This comment can get outdated soon-ish. Maybe we can remove the version? How do we handle future cases when iptables-libs from the system repository is newer than what we build (1.8.8)?

RUN microdnf --enablerepo=baseos install iproute-tc nftables

# Install iptables via rpm. Install compatible libnftnl version with the selected iptables version
RUN rpm --force -i /tmp/rpms/libnftnl-${LIBNFTNL_VER}.el8.aarch64.rpm && \
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remove --force ?

@coutinhop coutinhop merged commit 3d5410d into projectcalico:master Jul 19, 2024
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@coutinhop coutinhop deleted the pedro-CORE-10546 branch July 19, 2024 15:33
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Calico node error - iptables-legacy-save command failed
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