From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- lib/test_kprobes.c | 368 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 368 insertions(+) create mode 100644 lib/test_kprobes.c (limited to 'lib/test_kprobes.c') diff --git a/lib/test_kprobes.c b/lib/test_kprobes.c new file mode 100644 index 000000000..1c95e5719 --- /dev/null +++ b/lib/test_kprobes.c @@ -0,0 +1,368 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * test_kprobes.c - simple sanity test for *probes + * + * Copyright IBM Corp. 2008 + */ + +#include +#include +#include +#include + +#define div_factor 3 + +static u32 rand1, preh_val, posth_val; +static u32 (*target)(u32 value); +static u32 (*target2)(u32 value); +static struct kunit *current_test; + +static unsigned long (*internal_target)(void); +static unsigned long (*stacktrace_target)(void); +static unsigned long (*stacktrace_driver)(void); +static unsigned long target_return_address[2]; + +static noinline u32 kprobe_target(u32 value) +{ + return (value / div_factor); +} + +static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs) +{ + KUNIT_EXPECT_FALSE(current_test, preemptible()); + preh_val = (rand1 / div_factor); + return 0; +} + +static void kp_post_handler(struct kprobe *p, struct pt_regs *regs, + unsigned long flags) +{ + KUNIT_EXPECT_FALSE(current_test, preemptible()); + KUNIT_EXPECT_EQ(current_test, preh_val, (rand1 / div_factor)); + posth_val = preh_val + div_factor; +} + +static struct kprobe kp = { + .symbol_name = "kprobe_target", + .pre_handler = kp_pre_handler, + .post_handler = kp_post_handler +}; + +static void test_kprobe(struct kunit *test) +{ + current_test = test; + KUNIT_EXPECT_EQ(test, 0, register_kprobe(&kp)); + target(rand1); + unregister_kprobe(&kp); + KUNIT_EXPECT_NE(test, 0, preh_val); + KUNIT_EXPECT_NE(test, 0, posth_val); +} + +static noinline u32 kprobe_target2(u32 value) +{ + return (value / div_factor) + 1; +} + +static noinline unsigned long kprobe_stacktrace_internal_target(void) +{ + if (!target_return_address[0]) + target_return_address[0] = (unsigned long)__builtin_return_address(0); + return target_return_address[0]; +} + +static noinline unsigned long kprobe_stacktrace_target(void) +{ + if (!target_return_address[1]) + target_return_address[1] = (unsigned long)__builtin_return_address(0); + + if (internal_target) + internal_target(); + + return target_return_address[1]; +} + +static noinline unsigned long kprobe_stacktrace_driver(void) +{ + if (stacktrace_target) + stacktrace_target(); + + /* This is for preventing inlining the function */ + return (unsigned long)__builtin_return_address(0); +} + +static int kp_pre_handler2(struct kprobe *p, struct pt_regs *regs) +{ + preh_val = (rand1 / div_factor) + 1; + return 0; +} + +static void kp_post_handler2(struct kprobe *p, struct pt_regs *regs, + unsigned long flags) +{ + KUNIT_EXPECT_EQ(current_test, preh_val, (rand1 / div_factor) + 1); + posth_val = preh_val + div_factor; +} + +static struct kprobe kp2 = { + .symbol_name = "kprobe_target2", + .pre_handler = kp_pre_handler2, + .post_handler = kp_post_handler2 +}; + +static void test_kprobes(struct kunit *test) +{ + struct kprobe *kps[2] = {&kp, &kp2}; + + current_test = test; + + /* addr and flags should be cleard for reusing kprobe. */ + kp.addr = NULL; + kp.flags = 0; + + KUNIT_EXPECT_EQ(test, 0, register_kprobes(kps, 2)); + preh_val = 0; + posth_val = 0; + target(rand1); + + KUNIT_EXPECT_NE(test, 0, preh_val); + KUNIT_EXPECT_NE(test, 0, posth_val); + + preh_val = 0; + posth_val = 0; + target2(rand1); + + KUNIT_EXPECT_NE(test, 0, preh_val); + KUNIT_EXPECT_NE(test, 0, posth_val); + unregister_kprobes(kps, 2); +} + +#ifdef CONFIG_KRETPROBES +static u32 krph_val; + +static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs) +{ + KUNIT_EXPECT_FALSE(current_test, preemptible()); + krph_val = (rand1 / div_factor); + return 0; +} + +static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs) +{ + unsigned long ret = regs_return_value(regs); + + KUNIT_EXPECT_FALSE(current_test, preemptible()); + KUNIT_EXPECT_EQ(current_test, ret, rand1 / div_factor); + KUNIT_EXPECT_NE(current_test, krph_val, 0); + krph_val = rand1; + return 0; +} + +static struct kretprobe rp = { + .handler = return_handler, + .entry_handler = entry_handler, + .kp.symbol_name = "kprobe_target" +}; + +static void test_kretprobe(struct kunit *test) +{ + current_test = test; + KUNIT_EXPECT_EQ(test, 0, register_kretprobe(&rp)); + target(rand1); + unregister_kretprobe(&rp); + KUNIT_EXPECT_EQ(test, krph_val, rand1); +} + +static int return_handler2(struct kretprobe_instance *ri, struct pt_regs *regs) +{ + unsigned long ret = regs_return_value(regs); + + KUNIT_EXPECT_EQ(current_test, ret, (rand1 / div_factor) + 1); + KUNIT_EXPECT_NE(current_test, krph_val, 0); + krph_val = rand1; + return 0; +} + +static struct kretprobe rp2 = { + .handler = return_handler2, + .entry_handler = entry_handler, + .kp.symbol_name = "kprobe_target2" +}; + +static void test_kretprobes(struct kunit *test) +{ + struct kretprobe *rps[2] = {&rp, &rp2}; + + current_test = test; + /* addr and flags should be cleard for reusing kprobe. */ + rp.kp.addr = NULL; + rp.kp.flags = 0; + KUNIT_EXPECT_EQ(test, 0, register_kretprobes(rps, 2)); + + krph_val = 0; + target(rand1); + KUNIT_EXPECT_EQ(test, krph_val, rand1); + + krph_val = 0; + target2(rand1); + KUNIT_EXPECT_EQ(test, krph_val, rand1); + unregister_kretprobes(rps, 2); +} + +#ifdef CONFIG_ARCH_CORRECT_STACKTRACE_ON_KRETPROBE +#define STACK_BUF_SIZE 16 +static unsigned long stack_buf[STACK_BUF_SIZE]; + +static int stacktrace_return_handler(struct kretprobe_instance *ri, struct pt_regs *regs) +{ + unsigned long retval = regs_return_value(regs); + int i, ret; + + KUNIT_EXPECT_FALSE(current_test, preemptible()); + KUNIT_EXPECT_EQ(current_test, retval, target_return_address[1]); + + /* + * Test stacktrace inside the kretprobe handler, this will involves + * kretprobe trampoline, but must include correct return address + * of the target function. + */ + ret = stack_trace_save(stack_buf, STACK_BUF_SIZE, 0); + KUNIT_EXPECT_NE(current_test, ret, 0); + + for (i = 0; i < ret; i++) { + if (stack_buf[i] == target_return_address[1]) + break; + } + KUNIT_EXPECT_NE(current_test, i, ret); + +#if !IS_MODULE(CONFIG_KPROBES_SANITY_TEST) + /* + * Test stacktrace from pt_regs at the return address. Thus the stack + * trace must start from the target return address. + */ + ret = stack_trace_save_regs(regs, stack_buf, STACK_BUF_SIZE, 0); + KUNIT_EXPECT_NE(current_test, ret, 0); + KUNIT_EXPECT_EQ(current_test, stack_buf[0], target_return_address[1]); +#endif + + return 0; +} + +static struct kretprobe rp3 = { + .handler = stacktrace_return_handler, + .kp.symbol_name = "kprobe_stacktrace_target" +}; + +static void test_stacktrace_on_kretprobe(struct kunit *test) +{ + unsigned long myretaddr = (unsigned long)__builtin_return_address(0); + + current_test = test; + rp3.kp.addr = NULL; + rp3.kp.flags = 0; + + /* + * Run the stacktrace_driver() to record correct return address in + * stacktrace_target() and ensure stacktrace_driver() call is not + * inlined by checking the return address of stacktrace_driver() + * and the return address of this function is different. + */ + KUNIT_ASSERT_NE(test, myretaddr, stacktrace_driver()); + + KUNIT_ASSERT_EQ(test, 0, register_kretprobe(&rp3)); + KUNIT_ASSERT_NE(test, myretaddr, stacktrace_driver()); + unregister_kretprobe(&rp3); +} + +static int stacktrace_internal_return_handler(struct kretprobe_instance *ri, struct pt_regs *regs) +{ + unsigned long retval = regs_return_value(regs); + int i, ret; + + KUNIT_EXPECT_FALSE(current_test, preemptible()); + KUNIT_EXPECT_EQ(current_test, retval, target_return_address[0]); + + /* + * Test stacktrace inside the kretprobe handler for nested case. + * The unwinder will find the kretprobe_trampoline address on the + * return address, and kretprobe must solve that. + */ + ret = stack_trace_save(stack_buf, STACK_BUF_SIZE, 0); + KUNIT_EXPECT_NE(current_test, ret, 0); + + for (i = 0; i < ret - 1; i++) { + if (stack_buf[i] == target_return_address[0]) { + KUNIT_EXPECT_EQ(current_test, stack_buf[i + 1], target_return_address[1]); + break; + } + } + KUNIT_EXPECT_NE(current_test, i, ret); + +#if !IS_MODULE(CONFIG_KPROBES_SANITY_TEST) + /* Ditto for the regs version. */ + ret = stack_trace_save_regs(regs, stack_buf, STACK_BUF_SIZE, 0); + KUNIT_EXPECT_NE(current_test, ret, 0); + KUNIT_EXPECT_EQ(current_test, stack_buf[0], target_return_address[0]); + KUNIT_EXPECT_EQ(current_test, stack_buf[1], target_return_address[1]); +#endif + + return 0; +} + +static struct kretprobe rp4 = { + .handler = stacktrace_internal_return_handler, + .kp.symbol_name = "kprobe_stacktrace_internal_target" +}; + +static void test_stacktrace_on_nested_kretprobe(struct kunit *test) +{ + unsigned long myretaddr = (unsigned long)__builtin_return_address(0); + struct kretprobe *rps[2] = {&rp3, &rp4}; + + current_test = test; + rp3.kp.addr = NULL; + rp3.kp.flags = 0; + + //KUNIT_ASSERT_NE(test, myretaddr, stacktrace_driver()); + + KUNIT_ASSERT_EQ(test, 0, register_kretprobes(rps, 2)); + KUNIT_ASSERT_NE(test, myretaddr, stacktrace_driver()); + unregister_kretprobes(rps, 2); +} +#endif /* CONFIG_ARCH_CORRECT_STACKTRACE_ON_KRETPROBE */ + +#endif /* CONFIG_KRETPROBES */ + +static int kprobes_test_init(struct kunit *test) +{ + target = kprobe_target; + target2 = kprobe_target2; + stacktrace_target = kprobe_stacktrace_target; + internal_target = kprobe_stacktrace_internal_target; + stacktrace_driver = kprobe_stacktrace_driver; + rand1 = get_random_u32_above(div_factor); + return 0; +} + +static struct kunit_case kprobes_testcases[] = { + KUNIT_CASE(test_kprobe), + KUNIT_CASE(test_kprobes), +#ifdef CONFIG_KRETPROBES + KUNIT_CASE(test_kretprobe), + KUNIT_CASE(test_kretprobes), +#ifdef CONFIG_ARCH_CORRECT_STACKTRACE_ON_KRETPROBE + KUNIT_CASE(test_stacktrace_on_kretprobe), + KUNIT_CASE(test_stacktrace_on_nested_kretprobe), +#endif +#endif + {} +}; + +static struct kunit_suite kprobes_test_suite = { + .name = "kprobes_test", + .init = kprobes_test_init, + .test_cases = kprobes_testcases, +}; + +kunit_test_suites(&kprobes_test_suite); + +MODULE_LICENSE("GPL"); -- cgit v1.2.3