eldritch horrorsandRaito Bezarius
469cb4218d
if a build directory is accessible to other users it is possible to smuggle data in and out of build directories. usually this ins only a build purity problem, but in combination with other issues it can be used to break out of a build sandbox. to prevent this we default to using a subdirectory of nixStateDir (which is more restrictive). Fixes CVE-2025-52991. Change-Id: Iacfc9b50534de158618c815f9fb99d7dae1be4d0
37 lines
1.1 KiB
Bash
37 lines
1.1 KiB
Bash
source common.sh
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requireSandboxSupport
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[[ $busybox =~ busybox ]] || skipTest "no busybox"
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if ! command -p -v unshare; then skipTest "Need unshare"; fi
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needLocalStore "The test uses --store always so we would just be bypassing the daemon"
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unshare --mount --map-root-user bash <<EOF
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source common.sh
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# Avoid store dir being inside sandbox build-dir
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unset NIX_STORE_DIR
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setLocalStore () {
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export NIX_REMOTE=\$TEST_ROOT/\$1
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mkdir -p \$NIX_REMOTE
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}
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cmd=(nix-build ./hermetic.nix --arg busybox "$busybox" --arg seed 1 --no-out-link)
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# Fails with default setting
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# TODO better error
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setLocalStore store1
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expectStderr 1 "\${cmd[@]}" | grepQuiet "unable to start build process"
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# Fails with `require-drop-supplementary-groups`
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# TODO better error
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setLocalStore store2
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NIX_CONFIG='require-drop-supplementary-groups = true' \
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expectStderr 1 "\${cmd[@]}" | grepQuiet "unable to start build process"
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# Works without `require-drop-supplementary-groups`
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setLocalStore store3
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NIX_CONFIG='require-drop-supplementary-groups = false' \
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"\${cmd[@]}"
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EOF
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