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Always attempt setgroups but allow failure to be ignored.

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Ben Radford 2023-07-11 10:44:03 +01:00
parent 25b20b4ad2
commit 07dabcc90e
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3 changed files with 11 additions and 8 deletions
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9
src/libstore/build/local-derivation-goal.cc
View file

@ -909,9 +909,12 @@ void LocalDerivationGoal::startBuilder()
/* Drop additional groups here because we can't do it
after we've created the new user namespace. */
if (settings.dropSupplementaryGroups)
if (setgroups(0, 0) == -1)
throw SysError("setgroups failed. Set the drop-supplementary-groups option to false to skip this step.");
if (setgroups(0, 0) == -1) {
if (errno != EPERM)
throw SysError("setgroups failed");
if (settings.requireDropSupplementaryGroups)
throw Error("setgroups failed. Set the require-drop-supplementary-groups option to false to skip this step.");
}
ProcessOptions options;
options.cloneFlags = CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | CLONE_NEWUTS | CLONE_PARENT | SIGCHLD;

2
src/libstore/globals.hh
View file

@ -524,7 +524,7 @@ public:
Setting<bool> sandboxFallback{this, true, "sandbox-fallback",
"Whether to disable sandboxing when the kernel doesn't allow it."};
Setting<bool> dropSupplementaryGroups{this, getuid() == 0, "drop-supplementary-groups",
Setting<bool> requireDropSupplementaryGroups{this, true, "require-drop-supplementary-groups",
R"(
Whether to drop supplementary groups when building with sandboxing.
This is normally a good idea if we are root and have the capability to

8
tests/supplementary-groups.sh
View file

@ -20,14 +20,14 @@ unshare --mount --map-root-user bash <<EOF
setLocalStore store1
expectStderr 1 "\${cmd[@]}" | grepQuiet "unable to start build process"
# Fails with `drop-supplementary-groups`
# Fails with `require-drop-supplementary-groups`
# TODO better error
setLocalStore store2
NIX_CONFIG='drop-supplementary-groups = true' \
NIX_CONFIG='require-drop-supplementary-groups = true' \
expectStderr 1 "\${cmd[@]}" | grepQuiet "unable to start build process"
# Works without `drop-supplementary-groups`
# Works without `require-drop-supplementary-groups`
setLocalStore store3
NIX_CONFIG='drop-supplementary-groups = false' \
NIX_CONFIG='require-drop-supplementary-groups = false' \
"\${cmd[@]}"
EOF