Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

3 files changed, 574 insertions, 0 deletions

diff --git a/tools/testing/selftests/core/.gitignore b/tools/testing/selftests/core/.gitignore
new file mode 100644
index 000000000..6e6712ce5
--- /dev/null
+++ b/tools/testing/selftests/core/.gitignore
@@ -0,0 +1 @@
+close_range_test
diff --git a/tools/testing/selftests/core/Makefile b/tools/testing/selftests/core/Makefile
new file mode 100644
index 000000000..f6f2d6f47
--- /dev/null
+++ b/tools/testing/selftests/core/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+CFLAGS += -g -I../../../../usr/include/
+
+TEST_GEN_PROGS := close_range_test
+
+include ../lib.mk
+
diff --git a/tools/testing/selftests/core/close_range_test.c b/tools/testing/selftests/core/close_range_test.c
new file mode 100644
index 000000000..749239930
--- /dev/null
+++ b/tools/testing/selftests/core/close_range_test.c
@@ -0,0 +1,566 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/kernel.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syscall.h>
+#include <unistd.h>
+#include <sys/resource.h>
+
+#include "../kselftest_harness.h"
+#include "../clone3/clone3_selftests.h"
+
+#ifndef __NR_close_range
+	#if defined __alpha__
+		#define __NR_close_range 546
+	#elif defined _MIPS_SIM
+		#if _MIPS_SIM == _MIPS_SIM_ABI32	/* o32 */
+			#define __NR_close_range (436 + 4000)
+		#endif
+		#if _MIPS_SIM == _MIPS_SIM_NABI32	/* n32 */
+			#define __NR_close_range (436 + 6000)
+		#endif
+		#if _MIPS_SIM == _MIPS_SIM_ABI64	/* n64 */
+			#define __NR_close_range (436 + 5000)
+		#endif
+	#elif defined __ia64__
+		#define __NR_close_range (436 + 1024)
+	#else
+		#define __NR_close_range 436
+	#endif
+#endif
+
+#ifndef CLOSE_RANGE_UNSHARE
+#define CLOSE_RANGE_UNSHARE	(1U << 1)
+#endif
+
+#ifndef CLOSE_RANGE_CLOEXEC
+#define CLOSE_RANGE_CLOEXEC	(1U << 2)
+#endif
+
+static inline int sys_close_range(unsigned int fd, unsigned int max_fd,
+				  unsigned int flags)
+{
+	return syscall(__NR_close_range, fd, max_fd, flags);
+}
+
+TEST(core_close_range)
+{
+	int i, ret;
+	int open_fds[101];
+
+	for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
+		int fd;
+
+		fd = open("/dev/null", O_RDONLY | O_CLOEXEC);
+		ASSERT_GE(fd, 0) {
+			if (errno == ENOENT)
+				SKIP(return, "Skipping test since /dev/null does not exist");
+		}
+
+		open_fds[i] = fd;
+	}
+
+	EXPECT_EQ(-1, sys_close_range(open_fds[0], open_fds[100], -1)) {
+		if (errno == ENOSYS)
+			SKIP(return, "close_range() syscall not supported");
+	}
+
+	EXPECT_EQ(0, sys_close_range(open_fds[0], open_fds[50], 0));
+
+	for (i = 0; i <= 50; i++)
+		EXPECT_EQ(-1, fcntl(open_fds[i], F_GETFL));
+
+	for (i = 51; i <= 100; i++)
+		EXPECT_GT(fcntl(open_fds[i], F_GETFL), -1);
+
+	/* create a couple of gaps */
+	close(57);
+	close(78);
+	close(81);
+	close(82);
+	close(84);
+	close(90);
+
+	EXPECT_EQ(0, sys_close_range(open_fds[51], open_fds[92], 0));
+
+	for (i = 51; i <= 92; i++)
+		EXPECT_EQ(-1, fcntl(open_fds[i], F_GETFL));
+
+	for (i = 93; i <= 100; i++)
+		EXPECT_GT(fcntl(open_fds[i], F_GETFL), -1);
+
+	/* test that the kernel caps and still closes all fds */
+	EXPECT_EQ(0, sys_close_range(open_fds[93], open_fds[99], 0));
+
+	for (i = 93; i <= 99; i++)
+		EXPECT_EQ(-1, fcntl(open_fds[i], F_GETFL));
+
+	EXPECT_GT(fcntl(open_fds[i], F_GETFL), -1);
+
+	EXPECT_EQ(0, sys_close_range(open_fds[100], open_fds[100], 0));
+
+	EXPECT_EQ(-1, fcntl(open_fds[100], F_GETFL));
+}
+
+TEST(close_range_unshare)
+{
+	int i, ret, status;
+	pid_t pid;
+	int open_fds[101];
+	struct __clone_args args = {
+		.flags = CLONE_FILES,
+		.exit_signal = SIGCHLD,
+	};
+
+	for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
+		int fd;
+
+		fd = open("/dev/null", O_RDONLY | O_CLOEXEC);
+		ASSERT_GE(fd, 0) {
+			if (errno == ENOENT)
+				SKIP(return, "Skipping test since /dev/null does not exist");
+		}
+
+		open_fds[i] = fd;
+	}
+
+	pid = sys_clone3(&args, sizeof(args));
+	ASSERT_GE(pid, 0);
+
+	if (pid == 0) {
+		ret = sys_close_range(open_fds[0], open_fds[50],
+				      CLOSE_RANGE_UNSHARE);
+		if (ret)
+			exit(EXIT_FAILURE);
+
+		for (i = 0; i <= 50; i++)
+			if (fcntl(open_fds[i], F_GETFL) != -1)
+				exit(EXIT_FAILURE);
+
+		for (i = 51; i <= 100; i++)
+			if (fcntl(open_fds[i], F_GETFL) == -1)
+				exit(EXIT_FAILURE);
+
+		/* create a couple of gaps */
+		close(57);
+		close(78);
+		close(81);
+		close(82);
+		close(84);
+		close(90);
+
+		ret = sys_close_range(open_fds[51], open_fds[92],
+				      CLOSE_RANGE_UNSHARE);
+		if (ret)
+			exit(EXIT_FAILURE);
+
+		for (i = 51; i <= 92; i++)
+			if (fcntl(open_fds[i], F_GETFL) != -1)
+				exit(EXIT_FAILURE);
+
+		for (i = 93; i <= 100; i++)
+			if (fcntl(open_fds[i], F_GETFL) == -1)
+				exit(EXIT_FAILURE);
+
+		/* test that the kernel caps and still closes all fds */
+		ret = sys_close_range(open_fds[93], open_fds[99],
+				      CLOSE_RANGE_UNSHARE);
+		if (ret)
+			exit(EXIT_FAILURE);
+
+		for (i = 93; i <= 99; i++)
+			if (fcntl(open_fds[i], F_GETFL) != -1)
+				exit(EXIT_FAILURE);
+
+		if (fcntl(open_fds[100], F_GETFL) == -1)
+			exit(EXIT_FAILURE);
+
+		ret = sys_close_range(open_fds[100], open_fds[100],
+				      CLOSE_RANGE_UNSHARE);
+		if (ret)
+			exit(EXIT_FAILURE);
+
+		if (fcntl(open_fds[100], F_GETFL) != -1)
+			exit(EXIT_FAILURE);
+
+		exit(EXIT_SUCCESS);
+	}
+
+	EXPECT_EQ(waitpid(pid, &status, 0), pid);
+	EXPECT_EQ(true, WIFEXITED(status));
+	EXPECT_EQ(0, WEXITSTATUS(status));
+}
+
+TEST(close_range_unshare_capped)
+{
+	int i, ret, status;
+	pid_t pid;
+	int open_fds[101];
+	struct __clone_args args = {
+		.flags = CLONE_FILES,
+		.exit_signal = SIGCHLD,
+	};
+
+	for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
+		int fd;
+
+		fd = open("/dev/null", O_RDONLY | O_CLOEXEC);
+		ASSERT_GE(fd, 0) {
+			if (errno == ENOENT)
+				SKIP(return, "Skipping test since /dev/null does not exist");
+		}
+
+		open_fds[i] = fd;
+	}
+
+	pid = sys_clone3(&args, sizeof(args));
+	ASSERT_GE(pid, 0);
+
+	if (pid == 0) {
+		ret = sys_close_range(open_fds[0], UINT_MAX,
+				      CLOSE_RANGE_UNSHARE);
+		if (ret)
+			exit(EXIT_FAILURE);
+
+		for (i = 0; i <= 100; i++)
+			if (fcntl(open_fds[i], F_GETFL) != -1)
+				exit(EXIT_FAILURE);
+
+		exit(EXIT_SUCCESS);
+	}
+
+	EXPECT_EQ(waitpid(pid, &status, 0), pid);
+	EXPECT_EQ(true, WIFEXITED(status));
+	EXPECT_EQ(0, WEXITSTATUS(status));
+}
+
+TEST(close_range_cloexec)
+{
+	int i, ret;
+	int open_fds[101];
+	struct rlimit rlimit;
+
+	for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
+		int fd;
+
+		fd = open("/dev/null", O_RDONLY);
+		ASSERT_GE(fd, 0) {
+			if (errno == ENOENT)
+				SKIP(return, "Skipping test since /dev/null does not exist");
+		}
+
+		open_fds[i] = fd;
+	}
+
+	ret = sys_close_range(1000, 1000, CLOSE_RANGE_CLOEXEC);
+	if (ret < 0) {
+		if (errno == ENOSYS)
+			SKIP(return, "close_range() syscall not supported");
+		if (errno == EINVAL)
+			SKIP(return, "close_range() doesn't support CLOSE_RANGE_CLOEXEC");
+	}
+
+	/* Ensure the FD_CLOEXEC bit is set also with a resource limit in place.  */
+	ASSERT_EQ(0, getrlimit(RLIMIT_NOFILE, &rlimit));
+	rlimit.rlim_cur = 25;
+	ASSERT_EQ(0, setrlimit(RLIMIT_NOFILE, &rlimit));
+
+	/* Set close-on-exec for two ranges: [0-50] and [75-100].  */
+	ret = sys_close_range(open_fds[0], open_fds[50], CLOSE_RANGE_CLOEXEC);
+	ASSERT_EQ(0, ret);
+	ret = sys_close_range(open_fds[75], open_fds[100], CLOSE_RANGE_CLOEXEC);
+	ASSERT_EQ(0, ret);
+
+	for (i = 0; i <= 50; i++) {
+		int flags = fcntl(open_fds[i], F_GETFD);
+
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+	}
+
+	for (i = 51; i <= 74; i++) {
+		int flags = fcntl(open_fds[i], F_GETFD);
+
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, 0);
+	}
+
+	for (i = 75; i <= 100; i++) {
+		int flags = fcntl(open_fds[i], F_GETFD);
+
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+	}
+
+	/* Test a common pattern.  */
+	ret = sys_close_range(3, UINT_MAX, CLOSE_RANGE_CLOEXEC);
+	for (i = 0; i <= 100; i++) {
+		int flags = fcntl(open_fds[i], F_GETFD);
+
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+	}
+}
+
+TEST(close_range_cloexec_unshare)
+{
+	int i, ret;
+	int open_fds[101];
+	struct rlimit rlimit;
+
+	for (i = 0; i < ARRAY_SIZE(open_fds); i++) {
+		int fd;
+
+		fd = open("/dev/null", O_RDONLY);
+		ASSERT_GE(fd, 0) {
+			if (errno == ENOENT)
+				SKIP(return, "Skipping test since /dev/null does not exist");
+		}
+
+		open_fds[i] = fd;
+	}
+
+	ret = sys_close_range(1000, 1000, CLOSE_RANGE_CLOEXEC);
+	if (ret < 0) {
+		if (errno == ENOSYS)
+			SKIP(return, "close_range() syscall not supported");
+		if (errno == EINVAL)
+			SKIP(return, "close_range() doesn't support CLOSE_RANGE_CLOEXEC");
+	}
+
+	/* Ensure the FD_CLOEXEC bit is set also with a resource limit in place.  */
+	ASSERT_EQ(0, getrlimit(RLIMIT_NOFILE, &rlimit));
+	rlimit.rlim_cur = 25;
+	ASSERT_EQ(0, setrlimit(RLIMIT_NOFILE, &rlimit));
+
+	/* Set close-on-exec for two ranges: [0-50] and [75-100].  */
+	ret = sys_close_range(open_fds[0], open_fds[50],
+			      CLOSE_RANGE_CLOEXEC | CLOSE_RANGE_UNSHARE);
+	ASSERT_EQ(0, ret);
+	ret = sys_close_range(open_fds[75], open_fds[100],
+			      CLOSE_RANGE_CLOEXEC | CLOSE_RANGE_UNSHARE);
+	ASSERT_EQ(0, ret);
+
+	for (i = 0; i <= 50; i++) {
+		int flags = fcntl(open_fds[i], F_GETFD);
+
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+	}
+
+	for (i = 51; i <= 74; i++) {
+		int flags = fcntl(open_fds[i], F_GETFD);
+
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, 0);
+	}
+
+	for (i = 75; i <= 100; i++) {
+		int flags = fcntl(open_fds[i], F_GETFD);
+
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+	}
+
+	/* Test a common pattern.  */
+	ret = sys_close_range(3, UINT_MAX,
+			      CLOSE_RANGE_CLOEXEC | CLOSE_RANGE_UNSHARE);
+	for (i = 0; i <= 100; i++) {
+		int flags = fcntl(open_fds[i], F_GETFD);
+
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+	}
+}
+
+/*
+ * Regression test for syzbot+96cfd2b22b3213646a93@syzkaller.appspotmail.com
+ */
+TEST(close_range_cloexec_syzbot)
+{
+	int fd1, fd2, fd3, flags, ret, status;
+	pid_t pid;
+	struct __clone_args args = {
+		.flags = CLONE_FILES,
+		.exit_signal = SIGCHLD,
+	};
+
+	/* Create a huge gap in the fd table. */
+	fd1 = open("/dev/null", O_RDWR);
+	EXPECT_GT(fd1, 0);
+
+	fd2 = dup2(fd1, 1000);
+	EXPECT_GT(fd2, 0);
+
+	pid = sys_clone3(&args, sizeof(args));
+	ASSERT_GE(pid, 0);
+
+	if (pid == 0) {
+		ret = sys_close_range(3, ~0U, CLOSE_RANGE_CLOEXEC);
+		if (ret)
+			exit(EXIT_FAILURE);
+
+		/*
+			 * We now have a private file descriptor table and all
+			 * our open fds should still be open but made
+			 * close-on-exec.
+			 */
+		flags = fcntl(fd1, F_GETFD);
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+
+		flags = fcntl(fd2, F_GETFD);
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+
+		fd3 = dup2(fd1, 42);
+		EXPECT_GT(fd3, 0);
+
+		/*
+			 * Duplicating the file descriptor must remove the
+			 * FD_CLOEXEC flag.
+			 */
+		flags = fcntl(fd3, F_GETFD);
+		EXPECT_GT(flags, -1);
+		EXPECT_EQ(flags & FD_CLOEXEC, 0);
+
+		exit(EXIT_SUCCESS);
+	}
+
+	EXPECT_EQ(waitpid(pid, &status, 0), pid);
+	EXPECT_EQ(true, WIFEXITED(status));
+	EXPECT_EQ(0, WEXITSTATUS(status));
+
+	/*
+	 * We had a shared file descriptor table before along with requesting
+	 * close-on-exec so the original fds must not be close-on-exec.
+	 */
+	flags = fcntl(fd1, F_GETFD);
+	EXPECT_GT(flags, -1);
+	EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+
+	flags = fcntl(fd2, F_GETFD);
+	EXPECT_GT(flags, -1);
+	EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+
+	fd3 = dup2(fd1, 42);
+	EXPECT_GT(fd3, 0);
+
+	flags = fcntl(fd3, F_GETFD);
+	EXPECT_GT(flags, -1);
+	EXPECT_EQ(flags & FD_CLOEXEC, 0);
+
+	EXPECT_EQ(close(fd1), 0);
+	EXPECT_EQ(close(fd2), 0);
+	EXPECT_EQ(close(fd3), 0);
+}
+
+/*
+ * Regression test for syzbot+96cfd2b22b3213646a93@syzkaller.appspotmail.com
+ */
+TEST(close_range_cloexec_unshare_syzbot)
+{
+	int i, fd1, fd2, fd3, flags, ret, status;
+	pid_t pid;
+	struct __clone_args args = {
+		.flags = CLONE_FILES,
+		.exit_signal = SIGCHLD,
+	};
+
+	/*
+	 * Create a huge gap in the fd table. When we now call
+	 * CLOSE_RANGE_UNSHARE with a shared fd table and and with ~0U as upper
+	 * bound the kernel will only copy up to fd1 file descriptors into the
+	 * new fd table. If the kernel is buggy and doesn't handle
+	 * CLOSE_RANGE_CLOEXEC correctly it will not have copied all file
+	 * descriptors and we will oops!
+	 *
+	 * On a buggy kernel this should immediately oops. But let's loop just
+	 * to be sure.
+	 */
+	fd1 = open("/dev/null", O_RDWR);
+	EXPECT_GT(fd1, 0);
+
+	fd2 = dup2(fd1, 1000);
+	EXPECT_GT(fd2, 0);
+
+	for (i = 0; i < 100; i++) {
+
+		pid = sys_clone3(&args, sizeof(args));
+		ASSERT_GE(pid, 0);
+
+		if (pid == 0) {
+			ret = sys_close_range(3, ~0U, CLOSE_RANGE_UNSHARE |
+						      CLOSE_RANGE_CLOEXEC);
+			if (ret)
+				exit(EXIT_FAILURE);
+
+			/*
+			 * We now have a private file descriptor table and all
+			 * our open fds should still be open but made
+			 * close-on-exec.
+			 */
+			flags = fcntl(fd1, F_GETFD);
+			EXPECT_GT(flags, -1);
+			EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+
+			flags = fcntl(fd2, F_GETFD);
+			EXPECT_GT(flags, -1);
+			EXPECT_EQ(flags & FD_CLOEXEC, FD_CLOEXEC);
+
+			fd3 = dup2(fd1, 42);
+			EXPECT_GT(fd3, 0);
+
+			/*
+			 * Duplicating the file descriptor must remove the
+			 * FD_CLOEXEC flag.
+			 */
+			flags = fcntl(fd3, F_GETFD);
+			EXPECT_GT(flags, -1);
+			EXPECT_EQ(flags & FD_CLOEXEC, 0);
+
+			EXPECT_EQ(close(fd1), 0);
+			EXPECT_EQ(close(fd2), 0);
+			EXPECT_EQ(close(fd3), 0);
+
+			exit(EXIT_SUCCESS);
+		}
+
+		EXPECT_EQ(waitpid(pid, &status, 0), pid);
+		EXPECT_EQ(true, WIFEXITED(status));
+		EXPECT_EQ(0, WEXITSTATUS(status));
+	}
+
+	/*
+	 * We created a private file descriptor table before along with
+	 * requesting close-on-exec so the original fds must not be
+	 * close-on-exec.
+	 */
+	flags = fcntl(fd1, F_GETFD);
+	EXPECT_GT(flags, -1);
+	EXPECT_EQ(flags & FD_CLOEXEC, 0);
+
+	flags = fcntl(fd2, F_GETFD);
+	EXPECT_GT(flags, -1);
+	EXPECT_EQ(flags & FD_CLOEXEC, 0);
+
+	fd3 = dup2(fd1, 42);
+	EXPECT_GT(fd3, 0);
+
+	flags = fcntl(fd3, F_GETFD);
+	EXPECT_GT(flags, -1);
+	EXPECT_EQ(flags & FD_CLOEXEC, 0);
+
+	EXPECT_EQ(close(fd1), 0);
+	EXPECT_EQ(close(fd2), 0);
+	EXPECT_EQ(close(fd3), 0);
+}
+
+TEST_HARNESS_MAIN