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authorAlexei Starovoitov <ast@kernel.org>2021-03-18 03:45:23 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2021-03-18 19:13:42 +0300
commiteddbe8e6521401003e37e7848ef72e75c10ee2aa (patch)
tree1191446bc251a8b6b0363e5d3ab84ce5ad903112 /tools
parente65eaded4cc4de6bf153def9dde6b25392d9a236 (diff)
downloadlinux-eddbe8e6521401003e37e7848ef72e75c10ee2aa.tar.xz
selftest/bpf: Add a test to check trampoline freeing logic.
Add a selftest for commit e21aa341785c ("bpf: Fix fexit trampoline.") to make sure that attaching fexit prog to a sleeping kernel function will trigger appropriate trampoline and program destruction. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210318004523.55908-1-alexei.starovoitov@gmail.com
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/bpf/prog_tests/fexit_sleep.c82
-rw-r--r--tools/testing/selftests/bpf/progs/fexit_sleep.c31
2 files changed, 113 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_sleep.c b/tools/testing/selftests/bpf/prog_tests/fexit_sleep.c
new file mode 100644
index 000000000000..6c4d42a2386f
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/fexit_sleep.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#define _GNU_SOURCE
+#include <sched.h>
+#include <test_progs.h>
+#include <time.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+#include "fexit_sleep.skel.h"
+
+static int do_sleep(void *skel)
+{
+ struct fexit_sleep *fexit_skel = skel;
+ struct timespec ts1 = { .tv_nsec = 1 };
+ struct timespec ts2 = { .tv_sec = 10 };
+
+ fexit_skel->bss->pid = getpid();
+ (void)syscall(__NR_nanosleep, &ts1, NULL);
+ (void)syscall(__NR_nanosleep, &ts2, NULL);
+ return 0;
+}
+
+#define STACK_SIZE (1024 * 1024)
+static char child_stack[STACK_SIZE];
+
+void test_fexit_sleep(void)
+{
+ struct fexit_sleep *fexit_skel = NULL;
+ int wstatus, duration = 0;
+ pid_t cpid;
+ int err, fexit_cnt;
+
+ fexit_skel = fexit_sleep__open_and_load();
+ if (CHECK(!fexit_skel, "fexit_skel_load", "fexit skeleton failed\n"))
+ goto cleanup;
+
+ err = fexit_sleep__attach(fexit_skel);
+ if (CHECK(err, "fexit_attach", "fexit attach failed: %d\n", err))
+ goto cleanup;
+
+ cpid = clone(do_sleep, child_stack + STACK_SIZE, CLONE_FILES | SIGCHLD, fexit_skel);
+ if (CHECK(cpid == -1, "clone", strerror(errno)))
+ goto cleanup;
+
+ /* wait until first sys_nanosleep ends and second sys_nanosleep starts */
+ while (READ_ONCE(fexit_skel->bss->fentry_cnt) != 2);
+ fexit_cnt = READ_ONCE(fexit_skel->bss->fexit_cnt);
+ if (CHECK(fexit_cnt != 1, "fexit_cnt", "%d", fexit_cnt))
+ goto cleanup;
+
+ /* close progs and detach them. That will trigger two nop5->jmp5 rewrites
+ * in the trampolines to skip nanosleep_fexit prog.
+ * The nanosleep_fentry prog will get detached first.
+ * The nanosleep_fexit prog will get detached second.
+ * Detaching will trigger freeing of both progs JITed images.
+ * There will be two dying bpf_tramp_image-s, but only the initial
+ * bpf_tramp_image (with both _fentry and _fexit progs will be stuck
+ * waiting for percpu_ref_kill to confirm). The other one
+ * will be freed quickly.
+ */
+ close(bpf_program__fd(fexit_skel->progs.nanosleep_fentry));
+ close(bpf_program__fd(fexit_skel->progs.nanosleep_fexit));
+ fexit_sleep__detach(fexit_skel);
+
+ /* kill the thread to unwind sys_nanosleep stack through the trampoline */
+ kill(cpid, 9);
+
+ if (CHECK(waitpid(cpid, &wstatus, 0) == -1, "waitpid", strerror(errno)))
+ goto cleanup;
+ if (CHECK(WEXITSTATUS(wstatus) != 0, "exitstatus", "failed"))
+ goto cleanup;
+
+ /* The bypassed nanosleep_fexit prog shouldn't have executed.
+ * Unlike progs the maps were not freed and directly accessible.
+ */
+ fexit_cnt = READ_ONCE(fexit_skel->bss->fexit_cnt);
+ if (CHECK(fexit_cnt != 1, "fexit_cnt", "%d", fexit_cnt))
+ goto cleanup;
+
+cleanup:
+ fexit_sleep__destroy(fexit_skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/fexit_sleep.c b/tools/testing/selftests/bpf/progs/fexit_sleep.c
new file mode 100644
index 000000000000..03a672d76353
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/fexit_sleep.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char LICENSE[] SEC("license") = "GPL";
+
+int pid = 0;
+int fentry_cnt = 0;
+int fexit_cnt = 0;
+
+SEC("fentry/__x64_sys_nanosleep")
+int BPF_PROG(nanosleep_fentry, const struct pt_regs *regs)
+{
+ if ((int)bpf_get_current_pid_tgid() != pid)
+ return 0;
+
+ fentry_cnt++;
+ return 0;
+}
+
+SEC("fexit/__x64_sys_nanosleep")
+int BPF_PROG(nanosleep_fexit, const struct pt_regs *regs, int ret)
+{
+ if ((int)bpf_get_current_pid_tgid() != pid)
+ return 0;
+
+ fexit_cnt++;
+ return 0;
+}