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(). ... --- arch/s390/kernel/traps.c | 403 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 403 insertions(+) create mode 100644 arch/s390/kernel/traps.c (limited to 'arch/s390/kernel/traps.c') diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c new file mode 100644 index 000000000..1d2aa448d --- /dev/null +++ b/arch/s390/kernel/traps.c @@ -0,0 +1,403 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * S390 version + * Copyright IBM Corp. 1999, 2000 + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), + * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), + * + * Derived from "arch/i386/kernel/traps.c" + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +/* + * 'Traps.c' handles hardware traps and faults after we have saved some + * state in 'asm.s'. + */ +#include "asm/irqflags.h" +#include "asm/ptrace.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "entry.h" + +static inline void __user *get_trap_ip(struct pt_regs *regs) +{ + unsigned long address; + + if (regs->int_code & 0x200) + address = current->thread.trap_tdb.data[3]; + else + address = regs->psw.addr; + return (void __user *) (address - (regs->int_code >> 16)); +} + +int is_valid_bugaddr(unsigned long addr) +{ + return 1; +} + +void do_report_trap(struct pt_regs *regs, int si_signo, int si_code, char *str) +{ + if (user_mode(regs)) { + force_sig_fault(si_signo, si_code, get_trap_ip(regs)); + report_user_fault(regs, si_signo, 0); + } else { + if (!fixup_exception(regs)) + die(regs, str); + } +} + +static void do_trap(struct pt_regs *regs, int si_signo, int si_code, char *str) +{ + if (notify_die(DIE_TRAP, str, regs, 0, + regs->int_code, si_signo) == NOTIFY_STOP) + return; + do_report_trap(regs, si_signo, si_code, str); +} +NOKPROBE_SYMBOL(do_trap); + +void do_per_trap(struct pt_regs *regs) +{ + if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP) + return; + if (!current->ptrace) + return; + force_sig_fault(SIGTRAP, TRAP_HWBKPT, + (void __force __user *) current->thread.per_event.address); +} +NOKPROBE_SYMBOL(do_per_trap); + +static void default_trap_handler(struct pt_regs *regs) +{ + if (user_mode(regs)) { + report_user_fault(regs, SIGSEGV, 0); + force_exit_sig(SIGSEGV); + } else + die(regs, "Unknown program exception"); +} + +#define DO_ERROR_INFO(name, signr, sicode, str) \ +static void name(struct pt_regs *regs) \ +{ \ + do_trap(regs, signr, sicode, str); \ +} + +DO_ERROR_INFO(addressing_exception, SIGILL, ILL_ILLADR, + "addressing exception") +DO_ERROR_INFO(execute_exception, SIGILL, ILL_ILLOPN, + "execute exception") +DO_ERROR_INFO(divide_exception, SIGFPE, FPE_INTDIV, + "fixpoint divide exception") +DO_ERROR_INFO(overflow_exception, SIGFPE, FPE_INTOVF, + "fixpoint overflow exception") +DO_ERROR_INFO(hfp_overflow_exception, SIGFPE, FPE_FLTOVF, + "HFP overflow exception") +DO_ERROR_INFO(hfp_underflow_exception, SIGFPE, FPE_FLTUND, + "HFP underflow exception") +DO_ERROR_INFO(hfp_significance_exception, SIGFPE, FPE_FLTRES, + "HFP significance exception") +DO_ERROR_INFO(hfp_divide_exception, SIGFPE, FPE_FLTDIV, + "HFP divide exception") +DO_ERROR_INFO(hfp_sqrt_exception, SIGFPE, FPE_FLTINV, + "HFP square root exception") +DO_ERROR_INFO(operand_exception, SIGILL, ILL_ILLOPN, + "operand exception") +DO_ERROR_INFO(privileged_op, SIGILL, ILL_PRVOPC, + "privileged operation") +DO_ERROR_INFO(special_op_exception, SIGILL, ILL_ILLOPN, + "special operation exception") +DO_ERROR_INFO(transaction_exception, SIGILL, ILL_ILLOPN, + "transaction constraint exception") + +static inline void do_fp_trap(struct pt_regs *regs, __u32 fpc) +{ + int si_code = 0; + /* FPC[2] is Data Exception Code */ + if ((fpc & 0x00000300) == 0) { + /* bits 6 and 7 of DXC are 0 iff IEEE exception */ + if (fpc & 0x8000) /* invalid fp operation */ + si_code = FPE_FLTINV; + else if (fpc & 0x4000) /* div by 0 */ + si_code = FPE_FLTDIV; + else if (fpc & 0x2000) /* overflow */ + si_code = FPE_FLTOVF; + else if (fpc & 0x1000) /* underflow */ + si_code = FPE_FLTUND; + else if (fpc & 0x0800) /* inexact */ + si_code = FPE_FLTRES; + } + do_trap(regs, SIGFPE, si_code, "floating point exception"); +} + +static void translation_specification_exception(struct pt_regs *regs) +{ + /* May never happen. */ + panic("Translation-Specification Exception"); +} + +static void illegal_op(struct pt_regs *regs) +{ + __u8 opcode[6]; + __u16 __user *location; + int is_uprobe_insn = 0; + int signal = 0; + + location = get_trap_ip(regs); + + if (user_mode(regs)) { + if (get_user(*((__u16 *) opcode), (__u16 __user *) location)) + return; + if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) { + if (current->ptrace) + force_sig_fault(SIGTRAP, TRAP_BRKPT, location); + else + signal = SIGILL; +#ifdef CONFIG_UPROBES + } else if (*((__u16 *) opcode) == UPROBE_SWBP_INSN) { + is_uprobe_insn = 1; +#endif + } else + signal = SIGILL; + } + /* + * We got either an illegal op in kernel mode, or user space trapped + * on a uprobes illegal instruction. See if kprobes or uprobes picks + * it up. If not, SIGILL. + */ + if (is_uprobe_insn || !user_mode(regs)) { + if (notify_die(DIE_BPT, "bpt", regs, 0, + 3, SIGTRAP) != NOTIFY_STOP) + signal = SIGILL; + } + if (signal) + do_trap(regs, signal, ILL_ILLOPC, "illegal operation"); +} +NOKPROBE_SYMBOL(illegal_op); + +DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN, + "specification exception"); + +static void vector_exception(struct pt_regs *regs) +{ + int si_code, vic; + + if (!MACHINE_HAS_VX) { + do_trap(regs, SIGILL, ILL_ILLOPN, "illegal operation"); + return; + } + + /* get vector interrupt code from fpc */ + save_fpu_regs(); + vic = (current->thread.fpu.fpc & 0xf00) >> 8; + switch (vic) { + case 1: /* invalid vector operation */ + si_code = FPE_FLTINV; + break; + case 2: /* division by zero */ + si_code = FPE_FLTDIV; + break; + case 3: /* overflow */ + si_code = FPE_FLTOVF; + break; + case 4: /* underflow */ + si_code = FPE_FLTUND; + break; + case 5: /* inexact */ + si_code = FPE_FLTRES; + break; + default: /* unknown cause */ + si_code = 0; + } + do_trap(regs, SIGFPE, si_code, "vector exception"); +} + +static void data_exception(struct pt_regs *regs) +{ + save_fpu_regs(); + if (current->thread.fpu.fpc & FPC_DXC_MASK) + do_fp_trap(regs, current->thread.fpu.fpc); + else + do_trap(regs, SIGILL, ILL_ILLOPN, "data exception"); +} + +static void space_switch_exception(struct pt_regs *regs) +{ + /* Set user psw back to home space mode. */ + if (user_mode(regs)) + regs->psw.mask |= PSW_ASC_HOME; + /* Send SIGILL. */ + do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event"); +} + +static void monitor_event_exception(struct pt_regs *regs) +{ + if (user_mode(regs)) + return; + + switch (report_bug(regs->psw.addr - (regs->int_code >> 16), regs)) { + case BUG_TRAP_TYPE_NONE: + fixup_exception(regs); + break; + case BUG_TRAP_TYPE_WARN: + break; + case BUG_TRAP_TYPE_BUG: + die(regs, "monitor event"); + break; + } +} + +void kernel_stack_overflow(struct pt_regs *regs) +{ + bust_spinlocks(1); + printk("Kernel stack overflow.\n"); + show_regs(regs); + bust_spinlocks(0); + panic("Corrupt kernel stack, can't continue."); +} +NOKPROBE_SYMBOL(kernel_stack_overflow); + +static void __init test_monitor_call(void) +{ + int val = 1; + + if (!IS_ENABLED(CONFIG_BUG)) + return; + asm volatile( + " mc 0,0\n" + "0: xgr %0,%0\n" + "1:\n" + EX_TABLE(0b,1b) + : "+d" (val)); + if (!val) + panic("Monitor call doesn't work!\n"); +} + +void __init trap_init(void) +{ + local_mcck_enable(); + test_monitor_call(); +} + +static void (*pgm_check_table[128])(struct pt_regs *regs); + +void noinstr __do_pgm_check(struct pt_regs *regs) +{ + unsigned int trapnr; + irqentry_state_t state; + + regs->int_code = S390_lowcore.pgm_int_code; + regs->int_parm_long = S390_lowcore.trans_exc_code; + + state = irqentry_enter(regs); + + if (user_mode(regs)) { + update_timer_sys(); + if (!static_branch_likely(&cpu_has_bear)) { + if (regs->last_break < 4096) + regs->last_break = 1; + } + current->thread.last_break = regs->last_break; + } + + if (S390_lowcore.pgm_code & 0x0200) { + /* transaction abort */ + current->thread.trap_tdb = S390_lowcore.pgm_tdb; + } + + if (S390_lowcore.pgm_code & PGM_INT_CODE_PER) { + if (user_mode(regs)) { + struct per_event *ev = ¤t->thread.per_event; + + set_thread_flag(TIF_PER_TRAP); + ev->address = S390_lowcore.per_address; + ev->cause = S390_lowcore.per_code_combined; + ev->paid = S390_lowcore.per_access_id; + } else { + /* PER event in kernel is kprobes */ + __arch_local_irq_ssm(regs->psw.mask & ~PSW_MASK_PER); + do_per_trap(regs); + goto out; + } + } + + if (!irqs_disabled_flags(regs->psw.mask)) + trace_hardirqs_on(); + __arch_local_irq_ssm(regs->psw.mask & ~PSW_MASK_PER); + + trapnr = regs->int_code & PGM_INT_CODE_MASK; + if (trapnr) + pgm_check_table[trapnr](regs); +out: + local_irq_disable(); + irqentry_exit(regs, state); +} + +/* + * The program check table contains exactly 128 (0x00-0x7f) entries. Each + * line defines the function to be called corresponding to the program check + * interruption code. + */ +static void (*pgm_check_table[128])(struct pt_regs *regs) = { + [0x00] = default_trap_handler, + [0x01] = illegal_op, + [0x02] = privileged_op, + [0x03] = execute_exception, + [0x04] = do_protection_exception, + [0x05] = addressing_exception, + [0x06] = specification_exception, + [0x07] = data_exception, + [0x08] = overflow_exception, + [0x09] = divide_exception, + [0x0a] = overflow_exception, + [0x0b] = divide_exception, + [0x0c] = hfp_overflow_exception, + [0x0d] = hfp_underflow_exception, + [0x0e] = hfp_significance_exception, + [0x0f] = hfp_divide_exception, + [0x10] = do_dat_exception, + [0x11] = do_dat_exception, + [0x12] = translation_specification_exception, + [0x13] = special_op_exception, + [0x14] = default_trap_handler, + [0x15] = operand_exception, + [0x16] = default_trap_handler, + [0x17] = default_trap_handler, + [0x18] = transaction_exception, + [0x19] = default_trap_handler, + [0x1a] = default_trap_handler, + [0x1b] = vector_exception, + [0x1c] = space_switch_exception, + [0x1d] = hfp_sqrt_exception, + [0x1e ... 0x37] = default_trap_handler, + [0x38] = do_dat_exception, + [0x39] = do_dat_exception, + [0x3a] = do_dat_exception, + [0x3b] = do_dat_exception, + [0x3c] = default_trap_handler, + [0x3d] = do_secure_storage_access, + [0x3e] = do_non_secure_storage_access, + [0x3f] = do_secure_storage_violation, + [0x40] = monitor_event_exception, + [0x41 ... 0x7f] = default_trap_handler, +}; + +#define COND_TRAP(x) asm( \ + ".weak " __stringify(x) "\n\t" \ + ".set " __stringify(x) "," \ + __stringify(default_trap_handler)) + +COND_TRAP(do_secure_storage_access); +COND_TRAP(do_non_secure_storage_access); +COND_TRAP(do_secure_storage_violation); -- cgit v1.2.3