Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * arch/arm64/kernel/probes/kprobes.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Kprobes support for ARM64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) 2013 Linaro Limited.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Author: Sandeepa Prabhu <sandeepa.prabhu@linaro.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kasan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/kprobes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/extable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/stop_machine.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/sched/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/set_memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/stringify.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/debug-monitors.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/daifflags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <asm/system_misc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <asm/insn.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <asm/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include "decode-insn.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static void __kprobes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) post_kprobe_handler(struct kprobe_ctlblk *, struct pt_regs *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static void __kprobes arch_prepare_ss_slot(struct kprobe *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	kprobe_opcode_t *addr = p->ainsn.api.insn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	void *addrs[] = {addr, addr + 1};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	u32 insns[] = {p->opcode, BRK64_OPCODE_KPROBES_SS};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	/* prepare insn slot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	aarch64_insn_patch_text(addrs, insns, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	flush_icache_range((uintptr_t)addr, (uintptr_t)(addr + MAX_INSN_SIZE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	 * Needs restoring of return address after stepping xol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	p->ainsn.api.restore = (unsigned long) p->addr +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	  sizeof(kprobe_opcode_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) static void __kprobes arch_prepare_simulate(struct kprobe *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	/* This instructions is not executed xol. No need to adjust the PC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	p->ainsn.api.restore = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static void __kprobes arch_simulate_insn(struct kprobe *p, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (p->ainsn.api.handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		p->ainsn.api.handler((u32)p->opcode, (long)p->addr, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	/* single step simulated, now go for post processing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	post_kprobe_handler(kcb, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) int __kprobes arch_prepare_kprobe(struct kprobe *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	unsigned long probe_addr = (unsigned long)p->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	if (probe_addr & 0x3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	/* copy instruction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	p->opcode = le32_to_cpu(*p->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	if (search_exception_tables(probe_addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	/* decode instruction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	switch (arm_kprobe_decode_insn(p->addr, &p->ainsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	case INSN_REJECTED:	/* insn not supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	case INSN_GOOD_NO_SLOT:	/* insn need simulation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		p->ainsn.api.insn = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	case INSN_GOOD:	/* instruction uses slot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		p->ainsn.api.insn = get_insn_slot();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		if (!p->ainsn.api.insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	/* prepare the instruction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (p->ainsn.api.insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		arch_prepare_ss_slot(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		arch_prepare_simulate(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) void *alloc_insn_page(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			NUMA_NO_NODE, __builtin_return_address(0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /* arm kprobe: install breakpoint in text */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) void __kprobes arch_arm_kprobe(struct kprobe *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	void *addr = p->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	u32 insn = BRK64_OPCODE_KPROBES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	aarch64_insn_patch_text(&addr, &insn, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /* disarm kprobe: remove breakpoint from text */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) void __kprobes arch_disarm_kprobe(struct kprobe *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	void *addr = p->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	aarch64_insn_patch_text(&addr, &p->opcode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) void __kprobes arch_remove_kprobe(struct kprobe *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (p->ainsn.api.insn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		free_insn_slot(p->ainsn.api.insn, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		p->ainsn.api.insn = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	kcb->prev_kprobe.kp = kprobe_running();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	kcb->prev_kprobe.status = kcb->kprobe_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	kcb->kprobe_status = kcb->prev_kprobe.status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static void __kprobes set_current_kprobe(struct kprobe *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	__this_cpu_write(current_kprobe, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  * Mask all of DAIF while executing the instruction out-of-line, to keep things
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  * simple and avoid nesting exceptions. Interrupts do have to be disabled since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)  * the kprobe state is per-CPU and doesn't get migrated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static void __kprobes kprobes_save_local_irqflag(struct kprobe_ctlblk *kcb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 						struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	kcb->saved_irqflag = regs->pstate & DAIF_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	regs->pstate |= DAIF_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static void __kprobes kprobes_restore_local_irqflag(struct kprobe_ctlblk *kcb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 						struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	regs->pstate &= ~DAIF_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	regs->pstate |= kcb->saved_irqflag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static void __kprobes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) set_ss_context(struct kprobe_ctlblk *kcb, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	kcb->ss_ctx.ss_pending = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	kcb->ss_ctx.match_addr = addr + sizeof(kprobe_opcode_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static void __kprobes clear_ss_context(struct kprobe_ctlblk *kcb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	kcb->ss_ctx.ss_pending = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	kcb->ss_ctx.match_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static void __kprobes setup_singlestep(struct kprobe *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 				       struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 				       struct kprobe_ctlblk *kcb, int reenter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	unsigned long slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if (reenter) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		save_previous_kprobe(kcb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		set_current_kprobe(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		kcb->kprobe_status = KPROBE_REENTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		kcb->kprobe_status = KPROBE_HIT_SS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (p->ainsn.api.insn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		/* prepare for single stepping */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		slot = (unsigned long)p->ainsn.api.insn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		set_ss_context(kcb, slot);	/* mark pending ss */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		kprobes_save_local_irqflag(kcb, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		instruction_pointer_set(regs, slot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		/* insn simulation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		arch_simulate_insn(p, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static int __kprobes reenter_kprobe(struct kprobe *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 				    struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 				    struct kprobe_ctlblk *kcb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	switch (kcb->kprobe_status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	case KPROBE_HIT_SSDONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	case KPROBE_HIT_ACTIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		kprobes_inc_nmissed_count(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		setup_singlestep(p, regs, kcb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	case KPROBE_HIT_SS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	case KPROBE_REENTER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		pr_warn("Unrecoverable kprobe detected.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		dump_kprobe(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		WARN_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static void __kprobes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) post_kprobe_handler(struct kprobe_ctlblk *kcb, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	struct kprobe *cur = kprobe_running();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	if (!cur)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	/* return addr restore if non-branching insn */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (cur->ainsn.api.restore != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		instruction_pointer_set(regs, cur->ainsn.api.restore);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	/* restore back original saved kprobe variables and continue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (kcb->kprobe_status == KPROBE_REENTER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		restore_previous_kprobe(kcb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	/* call post handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	kcb->kprobe_status = KPROBE_HIT_SSDONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (cur->post_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		cur->post_handler(cur, regs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	reset_current_kprobe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) int __kprobes kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	struct kprobe *cur = kprobe_running();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	switch (kcb->kprobe_status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	case KPROBE_HIT_SS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	case KPROBE_REENTER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		 * We are here because the instruction being single
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		 * stepped caused a page fault. We reset the current
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		 * kprobe and the ip points back to the probe address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		 * and allow the page fault handler to continue as a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		 * normal page fault.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		instruction_pointer_set(regs, (unsigned long) cur->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		if (!instruction_pointer(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		if (kcb->kprobe_status == KPROBE_REENTER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			restore_previous_kprobe(kcb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			kprobes_restore_local_irqflag(kcb, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			reset_current_kprobe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	case KPROBE_HIT_ACTIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	case KPROBE_HIT_SSDONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		 * We increment the nmissed count for accounting,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		 * we can also use npre/npostfault count for accounting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		 * these specific fault cases.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		kprobes_inc_nmissed_count(cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		 * We come here because instructions in the pre/post
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		 * handler caused the page_fault, this could happen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		 * if handler tries to access user space by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		 * copy_from_user(), get_user() etc. Let the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		 * user-specified handler try to fix it first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		if (cur->fault_handler && cur->fault_handler(cur, regs, fsr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		 * In case the user-specified fault handler returned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		 * zero, try to fix up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		if (fixup_exception(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) static void __kprobes kprobe_handler(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	struct kprobe *p, *cur_kprobe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	struct kprobe_ctlblk *kcb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	unsigned long addr = instruction_pointer(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	kcb = get_kprobe_ctlblk();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	cur_kprobe = kprobe_running();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	p = get_kprobe((kprobe_opcode_t *) addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	if (p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		if (cur_kprobe) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 			if (reenter_kprobe(p, regs, kcb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 				return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 			/* Probe hit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 			set_current_kprobe(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 			kcb->kprobe_status = KPROBE_HIT_ACTIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 			 * If we have no pre-handler or it returned 0, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 			 * continue with normal processing.  If we have a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 			 * pre-handler and it returned non-zero, it will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 			 * modify the execution path and no need to single
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			 * stepping. Let's just reset current kprobe and exit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 			if (!p->pre_handler || !p->pre_handler(p, regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 				setup_singlestep(p, regs, kcb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 			} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 				reset_current_kprobe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	 * The breakpoint instruction was removed right
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	 * after we hit it.  Another cpu has removed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	 * either a probepoint or a debugger breakpoint
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	 * at this address.  In either case, no further
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	 * handling of this interrupt is appropriate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	 * Return back to original instruction, and continue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) static int __kprobes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) kprobe_ss_hit(struct kprobe_ctlblk *kcb, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	if ((kcb->ss_ctx.ss_pending)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	    && (kcb->ss_ctx.match_addr == addr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		clear_ss_context(kcb);	/* clear pending ss */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		return DBG_HOOK_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	/* not ours, kprobes should ignore it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	return DBG_HOOK_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) static int __kprobes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) kprobe_breakpoint_ss_handler(struct pt_regs *regs, unsigned int esr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	/* return error if this is not our step */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	retval = kprobe_ss_hit(kcb, instruction_pointer(regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	if (retval == DBG_HOOK_HANDLED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 		kprobes_restore_local_irqflag(kcb, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		post_kprobe_handler(kcb, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static struct break_hook kprobes_break_ss_hook = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	.imm = KPROBES_BRK_SS_IMM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	.fn = kprobe_breakpoint_ss_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) static int __kprobes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) kprobe_breakpoint_handler(struct pt_regs *regs, unsigned int esr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	kprobe_handler(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	return DBG_HOOK_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) static struct break_hook kprobes_break_hook = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	.imm = KPROBES_BRK_IMM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	.fn = kprobe_breakpoint_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)  * Provide a blacklist of symbols identifying ranges which cannot be kprobed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)  * This blacklist is exposed to userspace via debugfs (kprobes/blacklist).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) int __init arch_populate_kprobe_blacklist(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	ret = kprobe_add_area_blacklist((unsigned long)__entry_text_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 					(unsigned long)__entry_text_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	ret = kprobe_add_area_blacklist((unsigned long)__irqentry_text_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 					(unsigned long)__irqentry_text_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	ret = kprobe_add_area_blacklist((unsigned long)__idmap_text_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 					(unsigned long)__idmap_text_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	ret = kprobe_add_area_blacklist((unsigned long)__hyp_text_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 					(unsigned long)__hyp_text_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	if (ret || is_kernel_in_hyp_mode())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 	ret = kprobe_add_area_blacklist((unsigned long)__hyp_idmap_text_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 					(unsigned long)__hyp_idmap_text_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	return (void *)kretprobe_trampoline_handler(regs, &kretprobe_trampoline,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 					(void *)kernel_stack_pointer(regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 				      struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	ri->ret_addr = (kprobe_opcode_t *)regs->regs[30];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 	ri->fp = (void *)kernel_stack_pointer(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 	/* replace return addr (x30) with trampoline */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	regs->regs[30] = (long)&kretprobe_trampoline;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) int __kprobes arch_trampoline_kprobe(struct kprobe *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) int __init arch_init_kprobes(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 	register_kernel_break_hook(&kprobes_break_hook);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 	register_kernel_break_hook(&kprobes_break_ss_hook);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }