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executor: mount isolated POSIX shared memory per action #34

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executor: mount isolated POSIX shared memory per action #34

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3 changes: 2 additions & 1 deletion src/action_executor.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -2109,7 +2109,7 @@ fn createOutputParent(io: std.Io, work_root: std.Io.Dir, path: []const u8) !void
}

fn prepareChrootBaseDirs(io: std.Io, chroot_root: std.Io.Dir) !void {
try chroot_root.createDirPath(io, "dev");
try chroot_root.createDirPath(io, "dev/shm");
try chroot_root.createDirPath(io, "proc");
try chroot_root.createDirPath(io, "tmp");
try chroot_root.createDirPath(io, "var/tmp");
Expand Down Expand Up @@ -3641,6 +3641,7 @@ test "prepareChrootBaseDirs creates temporary directories" {
defer work_dir.close(std.testing.io);

try prepareChrootBaseDirs(std.testing.io, work_dir);
try work_dir.access(std.testing.io, "dev/shm", .{});
try work_dir.access(std.testing.io, "tmp", .{});
try work_dir.access(std.testing.io, "var/tmp", .{});
}
8 changes: 8 additions & 0 deletions src/action_runner.zig
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Expand Up @@ -648,6 +648,14 @@ fn forkAction(action: ForkAction) !std.os.linux.pid_t {
childSyscallName(linux.chroot(action.chroot_dir.ptr), "chroot");
childSyscallName(linux.chdir("/"), "chdir_root");
childSyscallName(linux.mount("proc", "/proc", "proc", linux.MS.NOSUID | linux.MS.NODEV | linux.MS.NOEXEC, 0), "mount_proc");
const shared_memory_mount_data: [:0]const u8 = "mode=1777,size=64m";
childSyscallName(linux.mount(
"tmpfs",
"/dev/shm",
"tmpfs",
linux.MS.NOSUID | linux.MS.NODEV | linux.MS.NOEXEC,
@intFromPtr(shared_memory_mount_data.ptr),
), "mount_shm");
childDropPrivileges(action.sandbox_uid, action.sandbox_gid);
childSyscallName(linux.chdir(action.cwd.ptr), "chdir");
childInstallSocketFilter();
Expand Down