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selftests/net: SO_PASSPIDFD_THREAD
Extend the af_unix scm_pidfd selftest with SO_PASSPIDFD_THREAD tests. Co-developed-by: Andrew Halaney <andrew@amutable.com> Signed-off-by: Andrew Halaney <andrew@amutable.com> Link: https://patch.msgid.link/20261005-work-unix-passpidfd-v4-4-350183b6e02a@amutable.com Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com> Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner
parent
be3a5e06b9
commit
4e2446c83f
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@ -23,6 +23,8 @@ TEST_GEN_FILES := scm_rights_denial_lsm.bpf.o
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include ../../lib.mk
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include ../bpf.mk
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$(OUTPUT)/scm_pidfd: CFLAGS += -pthread
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$(OUTPUT)/scm_rights_denial_lsm: $(BPFOBJ)
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$(OUTPUT)/scm_rights_denial_lsm: CFLAGS += -I$(SCRATCH_DIR)/include
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$(OUTPUT)/scm_rights_denial_lsm: LDLIBS += -lelf -lz
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@ -10,6 +10,7 @@
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <pthread.h>
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#include <sys/un.h>
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#include <sys/signal.h>
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#include <sys/types.h>
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@ -27,6 +28,14 @@
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#define SCM_PIDFD 0x04
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#endif
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#ifndef SCM_PIDFD_THREAD
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#define SCM_PIDFD_THREAD 0x05
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#endif
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#ifndef SO_PASSPIDFD_THREAD
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#define SO_PASSPIDFD_THREAD 86
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#endif
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#define CHILD_EXIT_CODE_OK 123
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static void child_die()
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@ -553,4 +562,500 @@ TEST_F(scm_pidfd, test)
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close(pfd);
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}
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struct thread_ids {
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pid_t pid;
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pid_t tid;
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};
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#define MAX_WRITERS 2
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/* Used by writers to signal they've written, so we can sequence multiple writers */
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static int seq_pipe[2];
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static void *send_ids_thread(void *arg)
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{
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int fd = *(int *)arg;
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struct thread_ids ids = {
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.pid = getpid(),
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.tid = gettid(),
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};
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char sync;
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if (send(fd, &ids, sizeof(ids), 0) != sizeof(ids))
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return (void *)1;
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/* let the client start the next writer, so the queue order is known */
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if (write(seq_pipe[1], "1", 1) != 1)
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return (void *)1;
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/* stay alive until the receiver has looked at our pidfd */
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if (read(fd, &sync, 1) != 1)
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return (void *)1;
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return NULL;
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}
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static void *send_ids_creds_thread(void *arg)
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{
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int fd = *(int *)arg;
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struct thread_ids ids = {
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.pid = getpid(),
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.tid = gettid(),
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};
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struct ucred ucred = {
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.pid = getpid(),
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.uid = getuid(),
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.gid = getgid(),
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};
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char control[CMSG_SPACE(sizeof(ucred))] = { 0 };
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struct iovec iov;
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struct msghdr msg = { 0 };
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struct cmsghdr *cmsg;
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char sync;
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iov.iov_base = &ids;
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iov.iov_len = sizeof(ids);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = control;
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msg.msg_controllen = sizeof(control);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_CREDENTIALS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(ucred));
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memcpy(CMSG_DATA(cmsg), &ucred, sizeof(ucred));
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if (sendmsg(fd, &msg, 0) != sizeof(ids))
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return (void *)1;
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/* signal we've written our info */
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if (write(seq_pipe[1], "1", 1) != 1)
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return (void *)1;
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/* stay alive until the receiver has looked at our pidfd */
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if (read(fd, &sync, 1) != 1)
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return (void *)1;
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return NULL;
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}
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/*
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* Runs @nwriters copies of @sender, each in its own non-leader thread, one
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* at a time so the queue order is known, then tells the parent on @ackfd
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* that everything is queued.
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*/
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static void thread_client(int fd, int syncfd, int ackfd,
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void *(*sender)(void *), int nwriters)
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{
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pthread_t writers[MAX_WRITERS];
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void *ret;
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char sync;
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int i;
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/* wait until the receiver enabled the options it wants */
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if (read(syncfd, &sync, 1) != 1)
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child_die();
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for (i = 0; i < nwriters; i++) {
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if (pthread_create(&writers[i], NULL, sender, &fd))
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child_die();
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if (read(seq_pipe[0], &sync, 1) != 1)
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child_die();
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}
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if (write(ackfd, "1", 1) != 1)
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child_die();
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for (i = 0; i < nwriters; i++)
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if (pthread_join(writers[i], &ret) || ret)
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child_die();
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exit(0);
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}
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struct pidfd_msg {
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ssize_t len;
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struct thread_ids ids;
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struct pidfd_info tgid_info;
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struct pidfd_info thread_info;
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int tgid_flags;
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int thread_flags;
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bool have_tgid;
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bool have_thread;
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};
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static int get_pidfd_info(int pidfd, struct pidfd_info *info)
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{
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info->mask = PIDFD_INFO_PID;
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if (ioctl(pidfd, PIDFD_GET_INFO, info)) {
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log_err("ioctl(PIDFD_GET_INFO)");
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return -1;
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}
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return 0;
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}
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/* One recvmsg(), reporting how many bytes came back and what the pidfd
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* cmsgs that came with them say.
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*/
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static int read_pidfd_msg(int fd, struct pidfd_msg *out)
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{
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char control[CMSG_SPACE(sizeof(int)) * 2] = { 0 };
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int tgid_pidfd = -1, thread_pidfd = -1;
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struct thread_ids buf[2] = { 0 };
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struct msghdr msg = { 0 };
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struct cmsghdr *cmsg;
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struct iovec iov;
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iov.iov_base = buf;
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iov.iov_len = sizeof(buf);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = control;
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msg.msg_controllen = sizeof(control);
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out->len = recvmsg(fd, &msg, 0);
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if (out->len < 0) {
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log_err("recvmsg");
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return -1;
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}
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if (msg.msg_flags & MSG_CTRUNC) {
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log_err("recvmsg: control truncated");
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return -1;
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}
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out->ids = buf[0];
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
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cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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if (cmsg->cmsg_level != SOL_SOCKET)
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continue;
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if (cmsg->cmsg_type == SCM_PIDFD)
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memcpy(&tgid_pidfd, CMSG_DATA(cmsg), sizeof(tgid_pidfd));
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else if (cmsg->cmsg_type == SCM_PIDFD_THREAD)
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memcpy(&thread_pidfd, CMSG_DATA(cmsg), sizeof(thread_pidfd));
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}
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out->have_tgid = tgid_pidfd >= 0;
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out->have_thread = thread_pidfd >= 0;
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if (out->have_tgid) {
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if (get_pidfd_info(tgid_pidfd, &out->tgid_info))
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return -1;
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out->tgid_flags = fcntl(tgid_pidfd, F_GETFL);
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close(tgid_pidfd);
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}
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if (out->have_thread) {
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if (get_pidfd_info(thread_pidfd, &out->thread_info))
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return -1;
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out->thread_flags = fcntl(thread_pidfd, F_GETFL);
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close(thread_pidfd);
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}
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return 0;
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}
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/*
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* Runs @nwriters threads of one child process against a SOCK_STREAM pair,
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* all of them queued before the parent reads. SO_PASSPIDFD is set when
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* @want_tgid is given, SO_PASSPIDFD_THREAD when @want_thread is. @nread
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* reads are returned in @out.
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*/
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static int pidfd_flow(void *(*sender)(void *), int nwriters, bool want_tgid,
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bool want_thread, struct pidfd_msg *out, int nread)
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{
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int child_status = 0;
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int syncpipe[2];
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int ackpipe[2];
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int sk[2];
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int on = 1;
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char sync;
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pid_t child;
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int i;
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if (nwriters > MAX_WRITERS)
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return -1;
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, sk))
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return -1;
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if (pipe(syncpipe) || pipe(ackpipe) || pipe(seq_pipe))
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return -1;
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child = fork();
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if (child < 0)
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return -1;
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if (child == 0) {
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close(sk[0]);
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close(syncpipe[1]);
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close(ackpipe[0]);
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thread_client(sk[1], syncpipe[0], ackpipe[1], sender, nwriters);
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}
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close(sk[1]);
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close(syncpipe[0]);
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close(ackpipe[1]);
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close(seq_pipe[0]);
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close(seq_pipe[1]);
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if (want_tgid &&
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setsockopt(sk[0], SOL_SOCKET, SO_PASSPIDFD, &on, sizeof(on))) {
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log_err("Failed to set SO_PASSPIDFD");
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return -1;
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}
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if (want_thread &&
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setsockopt(sk[0], SOL_SOCKET, SO_PASSPIDFD_THREAD, &on, sizeof(on))) {
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log_err("Failed to set SO_PASSPIDFD_THREAD");
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return -1;
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}
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/* let the child know the options are set, it can write now */
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if (write(syncpipe[1], "1", 1) != 1)
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return -1;
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close(syncpipe[1]);
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/* wait until every writer has queued its message */
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if (read(ackpipe[0], &sync, 1) != 1)
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return -1;
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close(ackpipe[0]);
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for (i = 0; i < nread; i++)
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if (read_pidfd_msg(sk[0], &out[i]))
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return -1;
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/* release the writers */
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for (i = 0; i < nwriters; i++)
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if (write(sk[0], "x", 1) != 1)
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return -1;
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close(sk[0]);
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waitpid(child, &child_status, 0);
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if (!WIFEXITED(child_status) || WEXITSTATUS(child_status))
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return -1;
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return 0;
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}
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static int sockopt_set(int fd, int optname, int val)
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{
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return setsockopt(fd, SOL_SOCKET, optname, &val, sizeof(val));
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}
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static int sockopt_get(int fd, int optname)
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{
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socklen_t len = sizeof(int);
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int val = -1;
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if (getsockopt(fd, SOL_SOCKET, optname, &val, &len))
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return -1;
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return val;
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}
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TEST(scm_pidfd_setsockopt_values)
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{
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int sk[2];
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ASSERT_EQ(0, socketpair(AF_UNIX, SOCK_STREAM, 0, sk));
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/* Verify that the options are truly set independently */
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ASSERT_EQ(0, sockopt_set(sk[0], SO_PASSPIDFD_THREAD, 1));
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ASSERT_EQ(1, sockopt_get(sk[0], SO_PASSPIDFD_THREAD));
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ASSERT_EQ(0, sockopt_get(sk[0], SO_PASSPIDFD));
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ASSERT_EQ(0, sockopt_set(sk[0], SO_PASSPIDFD, 1));
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ASSERT_EQ(1, sockopt_get(sk[0], SO_PASSPIDFD));
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ASSERT_EQ(1, sockopt_get(sk[0], SO_PASSPIDFD_THREAD));
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/* Verify that the options are truly cleared independently */
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ASSERT_EQ(0, sockopt_set(sk[0], SO_PASSPIDFD, 0));
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ASSERT_EQ(0, sockopt_get(sk[0], SO_PASSPIDFD));
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ASSERT_EQ(1, sockopt_get(sk[0], SO_PASSPIDFD_THREAD));
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ASSERT_EQ(0, sockopt_set(sk[0], SO_PASSPIDFD_THREAD, 0));
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ASSERT_EQ(0, sockopt_get(sk[0], SO_PASSPIDFD_THREAD));
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ASSERT_EQ(0, sockopt_get(sk[0], SO_PASSPIDFD));
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close(sk[0]);
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close(sk[1]);
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}
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/* A receiver that only asked about the process cannot tell the two
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* threads apart, so their writes are glued into one read.
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*/
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TEST(scm_pidfd_stream_glues_threads)
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{
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struct pidfd_msg msg[1] = { 0 };
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ASSERT_EQ(0, pidfd_flow(send_ids_thread, 2, true, false, msg, 1));
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EXPECT_EQ(sizeof(struct thread_ids) * 2, msg[0].len);
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EXPECT_TRUE(msg[0].have_tgid);
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EXPECT_FALSE(msg[0].have_thread);
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EXPECT_EQ(msg[0].ids.pid, msg[0].tgid_info.pid);
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EXPECT_EQ(msg[0].ids.pid, msg[0].tgid_info.tgid);
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}
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/* A receiver asking for both thread and process pidfd should get a unique
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* msg for each thread writing
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*/
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TEST(scm_pidfd_thread_stream_splits_on_threads)
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{
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struct pidfd_msg msg[2] = { 0 };
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int i;
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ASSERT_EQ(0, pidfd_flow(send_ids_thread, 2, true, true, msg, 2));
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for (i = 0; i < 2; i++) {
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EXPECT_EQ(sizeof(struct thread_ids), msg[i].len);
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EXPECT_TRUE(msg[i].have_tgid);
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EXPECT_TRUE(msg[i].have_thread);
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/* Make sure the info makes sense for the pidfd type */
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EXPECT_EQ(msg[i].ids.pid, msg[i].tgid_info.pid);
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EXPECT_EQ(msg[i].ids.pid, msg[i].tgid_info.tgid);
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EXPECT_EQ(msg[i].ids.tid, msg[i].thread_info.pid);
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EXPECT_EQ(msg[i].ids.pid, msg[i].thread_info.tgid);
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EXPECT_NE(msg[i].ids.pid, msg[i].ids.tid);
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}
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/* Make sure we really got unique threads per message */
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EXPECT_NE(msg[0].ids.tid, msg[1].ids.tid);
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EXPECT_EQ(msg[0].ids.pid, msg[1].ids.pid);
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EXPECT_EQ(msg[0].tgid_info.pid, msg[1].tgid_info.pid);
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EXPECT_NE(msg[0].thread_info.pid, msg[1].thread_info.pid);
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}
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/* Sends from the thread-group leader */
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static int leader_flow(bool want_thread, struct pidfd_msg *out)
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{
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struct thread_ids ids = {
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.pid = getpid(),
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.tid = gettid(),
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};
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int sk[2];
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int on = 1;
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int ret;
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, sk))
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return -1;
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if (setsockopt(sk[0], SOL_SOCKET, SO_PASSPIDFD, &on, sizeof(on))) {
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log_err("Failed to set SO_PASSPIDFD");
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return -1;
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}
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if (want_thread &&
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setsockopt(sk[0], SOL_SOCKET, SO_PASSPIDFD_THREAD, &on, sizeof(on))) {
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log_err("Failed to set SO_PASSPIDFD_THREAD");
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return -1;
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}
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if (send(sk[1], &ids, sizeof(ids), 0) != sizeof(ids)) {
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log_err("send");
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return -1;
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}
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ret = read_pidfd_msg(sk[0], out);
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close(sk[0]);
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close(sk[1]);
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return ret;
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}
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TEST(scm_pidfd_leader_sender)
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{
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struct pidfd_msg msg = { 0 };
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ASSERT_EQ(getpid(), gettid());
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ASSERT_EQ(0, leader_flow(false, &msg));
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ASSERT_TRUE(msg.have_tgid);
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EXPECT_FALSE(msg.have_thread);
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EXPECT_EQ(getpid(), msg.tgid_info.pid);
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EXPECT_EQ(getpid(), msg.tgid_info.tgid);
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EXPECT_FALSE(msg.tgid_flags & O_EXCL);
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}
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TEST(scm_pidfd_thread_leader_sender)
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{
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struct pidfd_msg msg = { 0 };
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ASSERT_EQ(getpid(), gettid());
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|
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ASSERT_EQ(0, leader_flow(true, &msg));
|
||||
ASSERT_TRUE(msg.have_tgid);
|
||||
ASSERT_TRUE(msg.have_thread);
|
||||
|
||||
EXPECT_EQ(getpid(), msg.tgid_info.pid);
|
||||
EXPECT_EQ(getpid(), msg.tgid_info.tgid);
|
||||
EXPECT_EQ(getpid(), msg.thread_info.pid);
|
||||
EXPECT_EQ(getpid(), msg.thread_info.tgid);
|
||||
|
||||
EXPECT_FALSE(msg.tgid_flags & O_EXCL);
|
||||
EXPECT_TRUE(msg.thread_flags & O_EXCL);
|
||||
}
|
||||
|
||||
TEST(scm_pidfd_thread_and_group)
|
||||
{
|
||||
struct pidfd_msg msg = { 0 };
|
||||
|
||||
ASSERT_EQ(0, pidfd_flow(send_ids_thread, 1, true, true, &msg, 1));
|
||||
ASSERT_NE(msg.ids.pid, msg.ids.tid);
|
||||
ASSERT_TRUE(msg.have_tgid);
|
||||
ASSERT_TRUE(msg.have_thread);
|
||||
|
||||
EXPECT_EQ(msg.ids.pid, msg.tgid_info.pid);
|
||||
EXPECT_EQ(msg.ids.pid, msg.tgid_info.tgid);
|
||||
|
||||
EXPECT_EQ(msg.ids.tid, msg.thread_info.pid);
|
||||
EXPECT_EQ(msg.ids.pid, msg.thread_info.tgid);
|
||||
}
|
||||
|
||||
TEST(scm_pidfd_thread)
|
||||
{
|
||||
struct pidfd_msg msg = { 0 };
|
||||
|
||||
ASSERT_EQ(0, pidfd_flow(send_ids_thread, 1, false, true, &msg, 1));
|
||||
ASSERT_NE(msg.ids.pid, msg.ids.tid);
|
||||
ASSERT_TRUE(msg.have_thread);
|
||||
EXPECT_FALSE(msg.have_tgid);
|
||||
EXPECT_EQ(msg.ids.tid, msg.thread_info.pid);
|
||||
EXPECT_EQ(msg.ids.pid, msg.thread_info.tgid);
|
||||
}
|
||||
|
||||
TEST(scm_pidfd_thread_group)
|
||||
{
|
||||
struct pidfd_msg msg = { 0 };
|
||||
|
||||
ASSERT_EQ(0, pidfd_flow(send_ids_thread, 1, true, false, &msg, 1));
|
||||
ASSERT_NE(msg.ids.pid, msg.ids.tid);
|
||||
ASSERT_TRUE(msg.have_tgid);
|
||||
EXPECT_FALSE(msg.have_thread);
|
||||
EXPECT_EQ(msg.ids.pid, msg.tgid_info.pid);
|
||||
EXPECT_EQ(msg.ids.pid, msg.tgid_info.tgid);
|
||||
}
|
||||
|
||||
TEST(scm_pidfd_thread_creds)
|
||||
{
|
||||
struct pidfd_msg msg = { 0 };
|
||||
|
||||
ASSERT_EQ(0, pidfd_flow(send_ids_creds_thread, 1, true, true, &msg, 1));
|
||||
ASSERT_NE(msg.ids.pid, msg.ids.tid);
|
||||
ASSERT_TRUE(msg.have_tgid);
|
||||
ASSERT_TRUE(msg.have_thread);
|
||||
EXPECT_EQ(msg.ids.pid, msg.tgid_info.pid);
|
||||
EXPECT_EQ(msg.ids.pid, msg.tgid_info.tgid);
|
||||
EXPECT_EQ(msg.ids.tid, msg.thread_info.pid);
|
||||
EXPECT_EQ(msg.ids.pid, msg.thread_info.tgid);
|
||||
}
|
||||
|
||||
TEST_HARNESS_MAIN
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user