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LSM selftest that implements a "lock on entry" namespace > sandbox policy. > > Signed-off-by: Christian Brauner Reviewed-by: Alan Maguire Tested-by: Alan Maguire one small thing below... > --- > .../testing/selftests/bpf/prog_tests/ns_sandbox.c | 99 ++++++++++++++++++++++ > .../testing/selftests/bpf/progs/test_ns_sandbox.c | 91 ++++++++++++++++++++ > 2 files changed, 190 insertions(+) > > diff --git a/tools/testing/selftests/bpf/prog_tests/ns_sandbox.c b/tools/testing/selftests/bpf/prog_tests/ns_sandbox.c > new file mode 100644 > index 000000000000..0ac2acfb6365 > --- /dev/null > +++ b/tools/testing/selftests/bpf/prog_tests/ns_sandbox.c > @@ -0,0 +1,99 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* Copyright (c) 2026 Christian Brauner */ > + > +/* > + * Test BPF LSM namespace sandbox: once you enter, you stay. > + * > + * The parent creates a tracked namespace, then forks a child. > + * The child enters the tracked namespace (allowed) and is then locked > + * out of any further setns(). > + */ > + > +#define _GNU_SOURCE > +#include > +#include > +#include > +#include > +#include > +#include "test_ns_sandbox.skel.h" > + > +void test_ns_sandbox(void) > +{ > + int orig_utsns = -1, new_utsns = -1; > + struct test_ns_sandbox *skel = NULL; > + int err, status; > + pid_t child; > + > + /* Save FD to current (host) namespace */ > + orig_utsns = open("/proc/self/ns/uts", O_RDONLY); > + if (!ASSERT_OK_FD(orig_utsns, "open orig utsns")) > + goto close_fds; > + > + skel = test_ns_sandbox__open_and_load(); > + if (!ASSERT_OK_PTR(skel, "skel open_and_load")) > + goto close_fds; > + > + err = test_ns_sandbox__attach(skel); > + if (!ASSERT_OK(err, "skel attach")) > + goto destroy; > + > + skel->bss->monitor_pid = getpid(); > + > + /* > + * Create a sandbox namespace. The alloc hook records its > + * inum because this task's pid matches monitor_pid. > + */ > + err = unshare(CLONE_NEWUTS); > + if (!ASSERT_OK(err, "unshare sandbox")) > + goto destroy; > + > + new_utsns = open("/proc/self/ns/uts", O_RDONLY); > + if (!ASSERT_OK_FD(new_utsns, "open sandbox utsns")) > + goto restore; > + > + /* > + * Return parent to host namespace. The host namespace is not > + * in the map so the install hook lets us through. > + */ > + err = setns(orig_utsns, CLONE_NEWUTS); > + if (!ASSERT_OK(err, "parent setns host utsns")) > + goto restore; > + > + /* > + * Fork a child that: > + * 1. Enters the sandbox UTS namespace — succeeds and locks it. > + * 2. Tries to switch to host UTS — denied (locked). > + */ > + child = fork(); > + if (child == 0) { > + /* Enter tracked namespace — allowed, we get locked */ > + if (setns(new_utsns, CLONE_NEWUTS) != 0) > + _exit(1); > + > + /* Locked: switching to host must fail */ > + if (setns(orig_utsns, CLONE_NEWUTS) != -1 || > + errno != EPERM) > + _exit(2); > + > + _exit(0); > + } > + if (!ASSERT_GE(child, 0, "fork child")) should be ASSERT_GT() I think since we deal with the child == 0 path above. > + goto restore; > + > + err = waitpid(child, &status, 0); > + ASSERT_GT(err, 0, "waitpid child"); > + ASSERT_TRUE(WIFEXITED(status), "child exited"); > + ASSERT_EQ(WEXITSTATUS(status), 0, "child locked in"); > + > + goto destroy; > + > +restore: > + setns(orig_utsns, CLONE_NEWUTS); > +destroy: > + test_ns_sandbox__destroy(skel); > +close_fds: > + if (new_utsns >= 0) > + close(new_utsns); > + if (orig_utsns >= 0) > + close(orig_utsns); > +} > diff --git a/tools/testing/selftests/bpf/progs/test_ns_sandbox.c b/tools/testing/selftests/bpf/progs/test_ns_sandbox.c > new file mode 100644 > index 000000000000..75c3493932a1 > --- /dev/null > +++ b/tools/testing/selftests/bpf/progs/test_ns_sandbox.c > @@ -0,0 +1,91 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* Copyright (c) 2026 Christian Brauner */ > + > +/* > + * BPF LSM namespace sandbox: once you enter, you stay. > + * > + * A designated process creates namespaces (tracked via alloc). When > + * any other process joins one of those namespaces it gets recorded in > + * locked_tasks. From that point on that process cannot setns() into > + * any other namespace — it is locked in. Task local storage is > + * automatically freed when the task exits. > + */ > + > +#include "vmlinux.h" > +#include > +#include > +#include > + > +/* > + * Namespaces created by the monitored process. > + * Key: namespace inode number. > + * Value: namespace type (CLONE_NEW* flag). > + */ > +struct { > + __uint(type, BPF_MAP_TYPE_HASH); > + __uint(max_entries, 64); > + __type(key, __u32); > + __type(value, __u32); > +} known_namespaces SEC(".maps"); > + > +/* PID of the process whose namespace creations are tracked. */ > +int monitor_pid; > + > +/* > + * Task local storage: marks tasks that have entered a tracked namespace > + * and are now locked. > + */ > +struct { > + __uint(type, BPF_MAP_TYPE_TASK_STORAGE); > + __uint(map_flags, BPF_F_NO_PREALLOC); > + __type(key, int); > + __type(value, __u8); > +} locked_tasks SEC(".maps"); > + > +char _license[] SEC("license") = "GPL"; > + > +/* Only the monitored process's namespace creations are tracked. */ > +SEC("lsm.s/namespace_alloc") > +int BPF_PROG(ns_alloc, struct ns_common *ns) > +{ > + __u32 inum, ns_type; > + > + if ((bpf_get_current_pid_tgid() >> 32) != monitor_pid) > + return 0; > + > + inum = ns->inum; > + ns_type = ns->ns_type; > + bpf_map_update_elem(&known_namespaces, &inum, &ns_type, BPF_ANY); > + > + return 0; > +} > + > +/* > + * Enforce the lock-in policy for all tasks: > + * - Already locked? Deny any setns. > + * - Entering a tracked namespace? Lock the task and allow. > + * - Everything else passes through. > + */ > +SEC("lsm.s/namespace_install") > +int BPF_PROG(ns_install, struct nsset *nsset, struct ns_common *ns) > +{ > + struct task_struct *task = bpf_get_current_task_btf(); > + __u32 inum = ns->inum; > + > + if (bpf_task_storage_get(&locked_tasks, task, 0, 0)) > + return -EPERM; > + > + if (bpf_map_lookup_elem(&known_namespaces, &inum)) > + bpf_task_storage_get(&locked_tasks, task, 0, > + BPF_LOCAL_STORAGE_GET_F_CREATE); > + > + return 0; > +} > + > +SEC("lsm/namespace_free") > +void BPF_PROG(ns_free, struct ns_common *ns) > +{ > + __u32 inum = ns->inum; > + > + bpf_map_delete_elem(&known_namespaces, &inum); > +} >