Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

4 files changed, 507 insertions, 0 deletions

diff --git a/tools/testing/selftests/uevent/.gitignore b/tools/testing/selftests/uevent/.gitignore
new file mode 100644
index 000000000..382afb74c
--- /dev/null
+++ b/tools/testing/selftests/uevent/.gitignore
@@ -0,0 +1 @@
+uevent_filtering
diff --git a/tools/testing/selftests/uevent/Makefile b/tools/testing/selftests/uevent/Makefile
new file mode 100644
index 000000000..f7baa9aa2
--- /dev/null
+++ b/tools/testing/selftests/uevent/Makefile
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+all:
+
+include ../lib.mk
+
+.PHONY: all clean
+
+BINARIES := uevent_filtering
+CFLAGS += -Wl,-no-as-needed -Wall
+
+uevent_filtering: uevent_filtering.c ../kselftest.h ../kselftest_harness.h
+	$(CC) $(CFLAGS) $< -o $@
+
+TEST_PROGS += $(BINARIES)
+EXTRA_CLEAN := $(BINARIES)
+
+all: $(BINARIES)
diff --git a/tools/testing/selftests/uevent/config b/tools/testing/selftests/uevent/config
new file mode 100644
index 000000000..1038f4515
--- /dev/null
+++ b/tools/testing/selftests/uevent/config
@@ -0,0 +1,2 @@
+CONFIG_USER_NS=y
+CONFIG_NET=y
diff --git a/tools/testing/selftests/uevent/uevent_filtering.c b/tools/testing/selftests/uevent/uevent_filtering.c
new file mode 100644
index 000000000..33a09f66d
--- /dev/null
+++ b/tools/testing/selftests/uevent/uevent_filtering.c
@@ -0,0 +1,487 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/netlink.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <sched.h>
+#include <sys/eventfd.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "kselftest_harness.h"
+
+#define __DEV_FULL "/sys/devices/virtual/mem/full/uevent"
+#define __UEVENT_BUFFER_SIZE (1024 * 1024)
+#define __UEVENT_HEADER "add@/devices/virtual/mem/full"
+#define __UEVENT_HEADER_LEN sizeof("add@/devices/virtual/mem/full")
+#define __UEVENT_LISTEN_ALL -1
+
+ssize_t read_nointr(int fd, void *buf, size_t count)
+{
+	ssize_t ret;
+
+again:
+	ret = read(fd, buf, count);
+	if (ret < 0 && errno == EINTR)
+		goto again;
+
+	return ret;
+}
+
+ssize_t write_nointr(int fd, const void *buf, size_t count)
+{
+	ssize_t ret;
+
+again:
+	ret = write(fd, buf, count);
+	if (ret < 0 && errno == EINTR)
+		goto again;
+
+	return ret;
+}
+
+int wait_for_pid(pid_t pid)
+{
+	int status, ret;
+
+again:
+	ret = waitpid(pid, &status, 0);
+	if (ret == -1) {
+		if (errno == EINTR)
+			goto again;
+
+		return -1;
+	}
+
+	if (ret != pid)
+		goto again;
+
+	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
+		return -1;
+
+	return 0;
+}
+
+static int uevent_listener(unsigned long post_flags, bool expect_uevent,
+			   int sync_fd)
+{
+	int sk_fd, ret;
+	socklen_t sk_addr_len;
+	int rcv_buf_sz = __UEVENT_BUFFER_SIZE;
+	uint64_t sync_add = 1;
+	struct sockaddr_nl sk_addr = { 0 }, rcv_addr = { 0 };
+	char buf[__UEVENT_BUFFER_SIZE] = { 0 };
+	struct iovec iov = { buf, __UEVENT_BUFFER_SIZE };
+	char control[CMSG_SPACE(sizeof(struct ucred))];
+	struct msghdr hdr = {
+		&rcv_addr, sizeof(rcv_addr), &iov, 1,
+		control,   sizeof(control),  0,
+	};
+
+	sk_fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC,
+		       NETLINK_KOBJECT_UEVENT);
+	if (sk_fd < 0) {
+		fprintf(stderr, "%s - Failed to open uevent socket\n", strerror(errno));
+		return -1;
+	}
+
+	ret = setsockopt(sk_fd, SOL_SOCKET, SO_RCVBUF, &rcv_buf_sz,
+			 sizeof(rcv_buf_sz));
+	if (ret < 0) {
+		fprintf(stderr, "%s - Failed to set socket options\n", strerror(errno));
+		goto on_error;
+	}
+
+	sk_addr.nl_family = AF_NETLINK;
+	sk_addr.nl_groups = __UEVENT_LISTEN_ALL;
+
+	sk_addr_len = sizeof(sk_addr);
+	ret = bind(sk_fd, (struct sockaddr *)&sk_addr, sk_addr_len);
+	if (ret < 0) {
+		fprintf(stderr, "%s - Failed to bind socket\n", strerror(errno));
+		goto on_error;
+	}
+
+	ret = getsockname(sk_fd, (struct sockaddr *)&sk_addr, &sk_addr_len);
+	if (ret < 0) {
+		fprintf(stderr, "%s - Failed to retrieve socket name\n", strerror(errno));
+		goto on_error;
+	}
+
+	if ((size_t)sk_addr_len != sizeof(sk_addr)) {
+		fprintf(stderr, "Invalid socket address size\n");
+		ret = -1;
+		goto on_error;
+	}
+
+	if (post_flags & CLONE_NEWUSER) {
+		ret = unshare(CLONE_NEWUSER);
+		if (ret < 0) {
+			fprintf(stderr,
+				"%s - Failed to unshare user namespace\n",
+				strerror(errno));
+			goto on_error;
+		}
+	}
+
+	if (post_flags & CLONE_NEWNET) {
+		ret = unshare(CLONE_NEWNET);
+		if (ret < 0) {
+			fprintf(stderr,
+				"%s - Failed to unshare network namespace\n",
+				strerror(errno));
+			goto on_error;
+		}
+	}
+
+	ret = write_nointr(sync_fd, &sync_add, sizeof(sync_add));
+	close(sync_fd);
+	if (ret != sizeof(sync_add)) {
+		ret = -1;
+		fprintf(stderr, "Failed to synchronize with parent process\n");
+		goto on_error;
+	}
+
+	ret = 0;
+	for (;;) {
+		ssize_t r;
+
+		r = recvmsg(sk_fd, &hdr, 0);
+		if (r <= 0) {
+			fprintf(stderr, "%s - Failed to receive uevent\n", strerror(errno));
+			ret = -1;
+			break;
+		}
+
+		/* ignore libudev messages */
+		if (memcmp(buf, "libudev", 8) == 0)
+			continue;
+
+		/* ignore uevents we didn't trigger */
+		if (memcmp(buf, __UEVENT_HEADER, __UEVENT_HEADER_LEN) != 0)
+			continue;
+
+		if (!expect_uevent) {
+			fprintf(stderr, "Received unexpected uevent:\n");
+			ret = -1;
+		}
+
+		if (TH_LOG_ENABLED) {
+			/* If logging is enabled dump the received uevent. */
+			(void)write_nointr(STDERR_FILENO, buf, r);
+			(void)write_nointr(STDERR_FILENO, "\n", 1);
+		}
+
+		break;
+	}
+
+on_error:
+	close(sk_fd);
+
+	return ret;
+}
+
+int trigger_uevent(unsigned int times)
+{
+	int fd, ret;
+	unsigned int i;
+
+	fd = open(__DEV_FULL, O_RDWR | O_CLOEXEC);
+	if (fd < 0) {
+		if (errno != ENOENT)
+			return -EINVAL;
+
+		return -1;
+	}
+
+	for (i = 0; i < times; i++) {
+		ret = write_nointr(fd, "add\n", sizeof("add\n") - 1);
+		if (ret < 0) {
+			fprintf(stderr, "Failed to trigger uevent\n");
+			break;
+		}
+	}
+	close(fd);
+
+	return ret;
+}
+
+int set_death_signal(void)
+{
+	int ret;
+	pid_t ppid;
+
+	ret = prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
+
+	/* Check whether we have been orphaned. */
+	ppid = getppid();
+	if (ppid == 1) {
+		pid_t self;
+
+		self = getpid();
+		ret = kill(self, SIGKILL);
+	}
+
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
+static int do_test(unsigned long pre_flags, unsigned long post_flags,
+		   bool expect_uevent, int sync_fd)
+{
+	int ret;
+	uint64_t wait_val;
+	pid_t pid;
+	sigset_t mask;
+	sigset_t orig_mask;
+	struct timespec timeout;
+
+	sigemptyset(&mask);
+	sigaddset(&mask, SIGCHLD);
+
+	ret = sigprocmask(SIG_BLOCK, &mask, &orig_mask);
+	if (ret < 0) {
+		fprintf(stderr, "%s- Failed to block SIGCHLD\n", strerror(errno));
+		return -1;
+	}
+
+	pid = fork();
+	if (pid < 0) {
+		fprintf(stderr, "%s - Failed to fork() new process\n", strerror(errno));
+		return -1;
+	}
+
+	if (pid == 0) {
+		/* Make sure that we go away when our parent dies. */
+		ret = set_death_signal();
+		if (ret < 0) {
+			fprintf(stderr, "Failed to set PR_SET_PDEATHSIG to SIGKILL\n");
+			_exit(EXIT_FAILURE);
+		}
+
+		if (pre_flags & CLONE_NEWUSER) {
+			ret = unshare(CLONE_NEWUSER);
+			if (ret < 0) {
+				fprintf(stderr,
+					"%s - Failed to unshare user namespace\n",
+					strerror(errno));
+				_exit(EXIT_FAILURE);
+			}
+		}
+
+		if (pre_flags & CLONE_NEWNET) {
+			ret = unshare(CLONE_NEWNET);
+			if (ret < 0) {
+				fprintf(stderr,
+					"%s - Failed to unshare network namespace\n",
+					strerror(errno));
+				_exit(EXIT_FAILURE);
+			}
+		}
+
+		if (uevent_listener(post_flags, expect_uevent, sync_fd) < 0)
+			_exit(EXIT_FAILURE);
+
+		_exit(EXIT_SUCCESS);
+	}
+
+	ret = read_nointr(sync_fd, &wait_val, sizeof(wait_val));
+	if (ret != sizeof(wait_val)) {
+		fprintf(stderr, "Failed to synchronize with child process\n");
+		_exit(EXIT_FAILURE);
+	}
+
+	/* Trigger 10 uevents to account for the case where the kernel might
+	 * drop some.
+	 */
+	ret = trigger_uevent(10);
+	if (ret < 0)
+		fprintf(stderr, "Failed triggering uevents\n");
+
+	/* Wait for 2 seconds before considering this failed. This should be
+	 * plenty of time for the kernel to deliver the uevent even under heavy
+	 * load.
+	 */
+	timeout.tv_sec = 2;
+	timeout.tv_nsec = 0;
+
+again:
+	ret = sigtimedwait(&mask, NULL, &timeout);
+	if (ret < 0) {
+		if (errno == EINTR)
+			goto again;
+
+		if (!expect_uevent)
+			ret = kill(pid, SIGTERM); /* success */
+		else
+			ret = kill(pid, SIGUSR1); /* error */
+		if (ret < 0)
+			return -1;
+	}
+
+	ret = wait_for_pid(pid);
+	if (ret < 0)
+		return -1;
+
+	return ret;
+}
+
+static void signal_handler(int sig)
+{
+	if (sig == SIGTERM)
+		_exit(EXIT_SUCCESS);
+
+	_exit(EXIT_FAILURE);
+}
+
+TEST(uevent_filtering)
+{
+	int ret, sync_fd;
+	struct sigaction act;
+
+	if (geteuid()) {
+		TH_LOG("Uevent filtering tests require root privileges. Skipping test");
+		_exit(KSFT_SKIP);
+	}
+
+	ret = access(__DEV_FULL, F_OK);
+	EXPECT_EQ(0, ret) {
+		if (errno == ENOENT) {
+			TH_LOG(__DEV_FULL " does not exist. Skipping test");
+			_exit(KSFT_SKIP);
+		}
+
+		_exit(KSFT_FAIL);
+	}
+
+	act.sa_handler = signal_handler;
+	act.sa_flags = 0;
+	sigemptyset(&act.sa_mask);
+
+	ret = sigaction(SIGTERM, &act, NULL);
+	ASSERT_EQ(0, ret);
+
+	sync_fd = eventfd(0, EFD_CLOEXEC);
+	ASSERT_GE(sync_fd, 0);
+
+	/*
+	 * Setup:
+	 * - Open uevent listening socket in initial network namespace owned by
+	 *   initial user namespace.
+	 * - Trigger uevent in initial network namespace owned by initial user
+	 *   namespace.
+	 * Expected Result:
+	 * - uevent listening socket receives uevent
+	 */
+	ret = do_test(0, 0, true, sync_fd);
+	ASSERT_EQ(0, ret) {
+		goto do_cleanup;
+	}
+
+	/*
+	 * Setup:
+	 * - Open uevent listening socket in non-initial network namespace
+	 *   owned by initial user namespace.
+	 * - Trigger uevent in initial network namespace owned by initial user
+	 *   namespace.
+	 * Expected Result:
+	 * - uevent listening socket receives uevent
+	 */
+	ret = do_test(CLONE_NEWNET, 0, true, sync_fd);
+	ASSERT_EQ(0, ret) {
+		goto do_cleanup;
+	}
+
+	/*
+	 * Setup:
+	 * - unshare user namespace
+	 * - Open uevent listening socket in initial network namespace
+	 *   owned by initial user namespace.
+	 * - Trigger uevent in initial network namespace owned by initial user
+	 *   namespace.
+	 * Expected Result:
+	 * - uevent listening socket receives uevent
+	 */
+	ret = do_test(CLONE_NEWUSER, 0, true, sync_fd);
+	ASSERT_EQ(0, ret) {
+		goto do_cleanup;
+	}
+
+	/*
+	 * Setup:
+	 * - Open uevent listening socket in non-initial network namespace
+	 *   owned by non-initial user namespace.
+	 * - Trigger uevent in initial network namespace owned by initial user
+	 *   namespace.
+	 * Expected Result:
+	 * - uevent listening socket receives no uevent
+	 */
+	ret = do_test(CLONE_NEWUSER | CLONE_NEWNET, 0, false, sync_fd);
+	ASSERT_EQ(0, ret) {
+		goto do_cleanup;
+	}
+
+	/*
+	 * Setup:
+	 * - Open uevent listening socket in initial network namespace
+	 *   owned by initial user namespace.
+	 * - unshare network namespace
+	 * - Trigger uevent in initial network namespace owned by initial user
+	 *   namespace.
+	 * Expected Result:
+	 * - uevent listening socket receives uevent
+	 */
+	ret = do_test(0, CLONE_NEWNET, true, sync_fd);
+	ASSERT_EQ(0, ret) {
+		goto do_cleanup;
+	}
+
+	/*
+	 * Setup:
+	 * - Open uevent listening socket in initial network namespace
+	 *   owned by initial user namespace.
+	 * - unshare user namespace
+	 * - Trigger uevent in initial network namespace owned by initial user
+	 *   namespace.
+	 * Expected Result:
+	 * - uevent listening socket receives uevent
+	 */
+	ret = do_test(0, CLONE_NEWUSER, true, sync_fd);
+	ASSERT_EQ(0, ret) {
+		goto do_cleanup;
+	}
+
+	/*
+	 * Setup:
+	 * - Open uevent listening socket in initial network namespace
+	 *   owned by initial user namespace.
+	 * - unshare user namespace
+	 * - unshare network namespace
+	 * - Trigger uevent in initial network namespace owned by initial user
+	 *   namespace.
+	 * Expected Result:
+	 * - uevent listening socket receives uevent
+	 */
+	ret = do_test(0, CLONE_NEWUSER | CLONE_NEWNET, true, sync_fd);
+	ASSERT_EQ(0, ret) {
+		goto do_cleanup;
+	}
+
+do_cleanup:
+	close(sync_fd);
+}
+
+TEST_HARNESS_MAIN