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fix(e2e): use high UID range to avoid host user conflicts #978

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fix(e2e): use high UID range to avoid host user conflicts #978

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6 changes: 4 additions & 2 deletions e2e/rust/tests/custom_image.rs
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Expand Up @@ -22,8 +22,10 @@ RUN apt-get update && apt-get install -y --no-install-recommends iproute2 \
&& rm -rf /var/lib/apt/lists/*

# Create the sandbox user/group so the supervisor can switch to it.
RUN groupadd -g 1000 sandbox && \
useradd -m -u 1000 -g sandbox sandbox
# Use a high UID range to avoid conflicts with host users when running without
# user namespace remapping (UID in container = UID on host).
RUN groupadd -g 1000660000 sandbox && \
useradd -m -u 1000660000 -g sandbox sandbox

# Write a marker file so we can verify this is our custom image.
RUN echo "custom-image-e2e-marker" > /opt/marker.txt
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8 changes: 5 additions & 3 deletions examples/bring-your-own-container/Dockerfile
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Expand Up @@ -14,9 +14,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
curl iproute2 iptables \
&& rm -rf /var/lib/apt/lists/*

# Create the sandbox user (uid/gid 1000) for non-root execution.
RUN groupadd -g 1000 sandbox && \
useradd -m -u 1000 -g sandbox sandbox
# Create the sandbox user for non-root execution.
# Use a high UID range to avoid conflicts with host users when running without
# user namespace remapping (UID in container = UID on host).
RUN groupadd -g 1000660000 sandbox && \
useradd -m -u 1000660000 -g sandbox sandbox

WORKDIR /sandbox
COPY app.py .
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4 changes: 3 additions & 1 deletion examples/bring-your-own-container/README.md
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Expand Up @@ -59,7 +59,9 @@ key requirements are:
- **Pass your start command explicitly** — use `-- <command>` on the CLI.
The image's `CMD` / `ENTRYPOINT` is replaced by the sandbox supervisor
at runtime.
- **Create a `sandbox` user** (uid/gid 1000) for non-root execution.
- **Create a `sandbox` user** (uid/gid 1000660000) for non-root execution.
Use a high UID (1000000000+) to avoid conflicts with host users when running
without user namespace remapping.
- **Install `iproute2`** for full network namespace isolation.
- **Use a standard Linux base image** — distroless and `FROM scratch`
images are not supported.
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