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fix(security): make .openclaw symlinks immutable after validation #1137

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Merged
cv merged 1 commit into from
Mar 31, 2026
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fix(security): make .openclaw symlinks immutable after validation #1137

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13 changes: 13 additions & 0 deletions scripts/nemoclaw-start.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -359,6 +359,19 @@ for entry in /sandbox/.openclaw/*; do
fi
done

# Lock .openclaw directory after symlink validation: set the immutable flag
# so symlinks cannot be swapped at runtime even if DAC or Landlock are
# bypassed. chattr requires cap_linux_immutable which the entrypoint has
# as root; the sandbox user cannot remove the flag.
# Ref: https://github.com/NVIDIA/NemoClaw/issues/1019
if command -v chattr >/dev/null 2>&1; then
chattr +i /sandbox/.openclaw 2>/dev/null || true
for entry in /sandbox/.openclaw/*; do
[ -L "$entry" ] || continue
chattr +i "$entry" 2>/dev/null || true
done
fi

# Start the gateway as the 'gateway' user.
# SECURITY: The sandbox user cannot kill this process because it runs
# under a different UID. The fake-HOME attack no longer works because
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