cregit-Linux how code gets into the kernel

Release 4.14 arch/sparc/kernel/kprobes.c

Directory: arch/sparc/kernel
// SPDX-License-Identifier: GPL-2.0
/* arch/sparc64/kernel/kprobes.c
 *
 * Copyright (C) 2004 David S. Miller <davem@davemloft.net>
 */

#include <linux/kernel.h>
#include <linux/kprobes.h>
#include <linux/extable.h>
#include <linux/kdebug.h>
#include <linux/slab.h>
#include <linux/context_tracking.h>
#include <asm/signal.h>
#include <asm/cacheflush.h>
#include <linux/uaccess.h>

/* We do not have hardware single-stepping on sparc64.
 * So we implement software single-stepping with breakpoint
 * traps.  The top-level scheme is similar to that used
 * in the x86 kprobes implementation.
 *
 * In the kprobe->ainsn.insn[] array we store the original
 * instruction at index zero and a break instruction at
 * index one.
 *
 * When we hit a kprobe we:
 * - Run the pre-handler
 * - Remember "regs->tnpc" and interrupt level stored in
 *   "regs->tstate" so we can restore them later
 * - Disable PIL interrupts
 * - Set regs->tpc to point to kprobe->ainsn.insn[0]
 * - Set regs->tnpc to point to kprobe->ainsn.insn[1]
 * - Mark that we are actively in a kprobe
 *
 * At this point we wait for the second breakpoint at
 * kprobe->ainsn.insn[1] to hit.  When it does we:
 * - Run the post-handler
 * - Set regs->tpc to "remembered" regs->tnpc stored above,
 *   restore the PIL interrupt level in "regs->tstate" as well
 * - Make any adjustments necessary to regs->tnpc in order
 *   to handle relative branches correctly.  See below.
 * - Mark that we are no longer actively in a kprobe.
 */

DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);


struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}};




int __kprobes arch_prepare_kprobe(struct kprobe *p)
{
	if ((unsigned long) p->addr & 0x3UL)
		return -EILSEQ;

	p->ainsn.insn[0] = *p->addr;
	flushi(&p->ainsn.insn[0]);

	p->ainsn.insn[1] = BREAKPOINT_INSTRUCTION_2;
	flushi(&p->ainsn.insn[1]);

	p->opcode = *p->addr;
	return 0;
}


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David S. Miller7178.89%450.00%


Rusty Lynch1011.11%112.50%


Prasanna S. Panchamukhi66.67%225.00%


Anil S Keshavamurthy33.33%112.50%


Total90100.00%8100.00%






void __kprobes arch_arm_kprobe(struct kprobe *p)
{
	*p->addr = BREAKPOINT_INSTRUCTION;
	flushi(p->addr);
}


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Prasanna S. Panchamukhi14.00%150.00%


Total25100.00%2100.00%






void __kprobes arch_disarm_kprobe(struct kprobe *p)
{
	*p->addr = p->opcode;
	flushi(p->addr);
}


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Prasanna S. Panchamukhi13.70%133.33%


David S. Miller13.70%133.33%


Total27100.00%3100.00%






static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
{
	kcb->prev_kprobe.kp = kprobe_running();
	kcb->prev_kprobe.status = kcb->kprobe_status;
	kcb->prev_kprobe.orig_tnpc = kcb->kprobe_orig_tnpc;
	kcb->prev_kprobe.orig_tstate_pil = kcb->kprobe_orig_tstate_pil;
}


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Prasanna S. Panchamukhi1427.45%250.00%


David S. Miller23.92%125.00%


Total51100.00%4100.00%






static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
{
	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
	kcb->kprobe_status = kcb->prev_kprobe.status;
	kcb->kprobe_orig_tnpc = kcb->prev_kprobe.orig_tnpc;
	kcb->kprobe_orig_tstate_pil = kcb->prev_kprobe.orig_tstate_pil;
}


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Prasanna S. Panchamukhi1528.30%250.00%


Christoph Lameter35.66%125.00%


Total53100.00%4100.00%






static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
				struct kprobe_ctlblk *kcb)
{
	__this_cpu_write(current_kprobe, p);
	kcb->kprobe_orig_tnpc = regs->tnpc;
	kcb->kprobe_orig_tstate_pil = (regs->tstate & TSTATE_PIL);
}


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David S. Miller2653.06%233.33%


Ananth N. Mavinakayanahalli1530.61%116.67%


Prasanna S. Panchamukhi510.20%233.33%


Christoph Lameter36.12%116.67%


Total49100.00%6100.00%






static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs,
			struct kprobe_ctlblk *kcb)
{
	regs->tstate |= TSTATE_PIL;

	/*single step inline, if it a breakpoint instruction*/
	if (p->opcode == BREAKPOINT_INSTRUCTION) {
		regs->tpc = (unsigned long) p->addr;
		regs->tnpc = kcb->kprobe_orig_tnpc;
	} else {
		regs->tpc = (unsigned long) &p->ainsn.insn[0];
		regs->tnpc = (unsigned long) &p->ainsn.insn[1];
	}
}


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David S. Miller3939.80%228.57%


Ananth N. Mavinakayanahalli88.16%114.29%


Total98100.00%7100.00%






static int __kprobes kprobe_handler(struct pt_regs *regs)
{
	struct kprobe *p;
	void *addr = (void *) regs->tpc;
	int ret = 0;
	struct kprobe_ctlblk *kcb;

	/*
         * We don't want to be preempted for the entire
         * duration of kprobe processing
         */
	preempt_disable();
	kcb = get_kprobe_ctlblk();

	if (kprobe_running()) {
		p = get_kprobe(addr);
		if (p) {
			if (kcb->kprobe_status == KPROBE_HIT_SS) {
				regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
					kcb->kprobe_orig_tstate_pil);
				goto no_kprobe;
			}
			/* We have reentered the kprobe_handler(), since
                         * another probe was hit while within the handler.
                         * We here save the original kprobes variables and
                         * just single step on the instruction of the new probe
                         * without calling any user handlers.
                         */
			save_previous_kprobe(kcb);
			set_current_kprobe(p, regs, kcb);
			kprobes_inc_nmissed_count(p);
			kcb->kprobe_status = KPROBE_REENTER;
			prepare_singlestep(p, regs, kcb);
			return 1;
		} else {
			if (*(u32 *)addr != BREAKPOINT_INSTRUCTION) {
			/* The breakpoint instruction was removed by
                         * another cpu right after we hit, no further
                         * handling of this interrupt is appropriate
                         */
				ret = 1;
				goto no_kprobe;
			}
			p = __this_cpu_read(current_kprobe);
			if (p->break_handler && p->break_handler(p, regs))
				goto ss_probe;
		}
		goto no_kprobe;
	}

	p = get_kprobe(addr);
	if (!p) {
		if (*(u32 *)addr != BREAKPOINT_INSTRUCTION) {
			/*
                         * The breakpoint instruction was removed right
                         * after we hit it.  Another cpu has removed
                         * either a probepoint or a debugger breakpoint
                         * at this address.  In either case, no further
                         * handling of this interrupt is appropriate.
                         */
			ret = 1;
		}
		/* Not one of ours: let kernel handle it */
		goto no_kprobe;
	}

	set_current_kprobe(p, regs, kcb);
	kcb->kprobe_status = KPROBE_HIT_ACTIVE;
	if (p->pre_handler && p->pre_handler(p, regs))
		return 1;

ss_probe:
	prepare_singlestep(p, regs, kcb);
	kcb->kprobe_status = KPROBE_HIT_SS;
	return 1;

no_kprobe:
	preempt_enable_no_resched();
	return ret;
}


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David S. Miller16156.10%216.67%


Prasanna S. Panchamukhi5017.42%325.00%


Ananth N. Mavinakayanahalli4515.68%325.00%


Anil S Keshavamurthy248.36%216.67%


Rusty Lynch62.09%18.33%


Christoph Lameter10.35%18.33%


Total287100.00%12100.00%



/* If INSN is a relative control transfer instruction,
 * return the corrected branch destination value.
 *
 * regs->tpc and regs->tnpc still hold the values of the
 * program counters at the time of trap due to the execution
 * of the BREAKPOINT_INSTRUCTION_2 at p->ainsn.insn[1]
 * 
 */



static unsigned long __kprobes relbranch_fixup(u32 insn, struct kprobe *p,
					       struct pt_regs *regs)
{
	unsigned long real_pc = (unsigned long) p->addr;

	/* Branch not taken, no mods necessary.  */
	if (regs->tnpc == regs->tpc + 0x4UL)
		return real_pc + 0x8UL;

	/* The three cases are call, branch w/prediction,
         * and traditional branch.
         */
	if ((insn & 0xc0000000) == 0x40000000 ||
	    (insn & 0xc1c00000) == 0x00400000 ||
	    (insn & 0xc1c00000) == 0x00800000) {
		unsigned long ainsn_addr;

		ainsn_addr = (unsigned long) &p->ainsn.insn[0];

		/* The instruction did all the work for us
                 * already, just apply the offset to the correct
                 * instruction location.
                 */
		return (real_pc + (regs->tnpc - ainsn_addr));
	}

	/* It is jmpl or some other absolute PC modification instruction,
         * leave NPC as-is.
         */
	return regs->tnpc;
}


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Total120100.00%3100.00%



/* If INSN is an instruction which writes it's PC location
 * into a destination register, fix that up.
 */



static void __kprobes retpc_fixup(struct pt_regs *regs, u32 insn,
				  unsigned long real_pc)
{
	unsigned long *slot = NULL;

	/* Simplest case is 'call', which always uses %o7 */
	if ((insn & 0xc0000000) == 0x40000000) {
		slot = &regs->u_regs[UREG_I7];
	}

	/* 'jmpl' encodes the register inside of the opcode */
	if ((insn & 0xc1f80000) == 0x81c00000) {
		unsigned long rd = ((insn >> 25) & 0x1f);

		if (rd <= 15) {
			slot = &regs->u_regs[rd];
		} else {
			/* Hard case, it goes onto the stack. */
			flushw_all();

			rd -= 16;
			slot = (unsigned long *)
				(regs->u_regs[UREG_FP] + STACK_BIAS);
			slot += rd;
		}
	}
	if (slot != NULL)
		*slot = real_pc;
}


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Prasanna S. Panchamukhi10.72%125.00%


Total138100.00%4100.00%



/*
 * Called after single-stepping.  p->addr is the address of the
 * instruction which has been replaced by the breakpoint
 * instruction.  To avoid the SMP problems that can occur when we
 * temporarily put back the original opcode to single-step, we
 * single-stepped a copy of the instruction.  The address of this
 * copy is &p->ainsn.insn[0].
 *
 * This function prepares to return from the post-single-step
 * breakpoint trap.
 */



static void __kprobes resume_execution(struct kprobe *p,
		struct pt_regs *regs, struct kprobe_ctlblk *kcb)
{
	u32 insn = p->ainsn.insn[0];

	regs->tnpc = relbranch_fixup(insn, p, regs);

	/* This assignment must occur after relbranch_fixup() */
	regs->tpc = kcb->kprobe_orig_tnpc;

	retpc_fixup(regs, insn, (unsigned long) p->addr);

	regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
			kcb->kprobe_orig_tstate_pil);
}


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Prasanna S. Panchamukhi33.33%233.33%


Total90100.00%6100.00%






static int __kprobes post_kprobe_handler(struct pt_regs *regs)
{
	struct kprobe *cur = kprobe_running();
	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();

	if (!cur)
		return 0;

	if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {
		kcb->kprobe_status = KPROBE_HIT_SSDONE;
		cur->post_handler(cur, regs, 0);
	}

	resume_execution(cur, regs, kcb);

	/*Restore back the original saved kprobes variables and continue. */
	if (kcb->kprobe_status == KPROBE_REENTER) {
		restore_previous_kprobe(kcb);
		goto out;
	}
	reset_current_kprobe();
out:
	preempt_enable_no_resched();

	return 1;
}


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Prasanna S. Panchamukhi2926.85%240.00%


Total108100.00%5100.00%






int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
	struct kprobe *cur = kprobe_running();
	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
	const struct exception_table_entry *entry;

	switch(kcb->kprobe_status) {
	case KPROBE_HIT_SS:
	case KPROBE_REENTER:
		/*
                 * We are here because the instruction being single
                 * stepped caused a page fault. We reset the current
                 * kprobe and the tpc points back to the probe address
                 * and allow the page fault handler to continue as a
                 * normal page fault.
                 */
		regs->tpc = (unsigned long)cur->addr;
		regs->tnpc = kcb->kprobe_orig_tnpc;
		regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
				kcb->kprobe_orig_tstate_pil);
		if (kcb->kprobe_status == KPROBE_REENTER)
			restore_previous_kprobe(kcb);
		else
			reset_current_kprobe();
		preempt_enable_no_resched();
		break;
	case KPROBE_HIT_ACTIVE:
	case KPROBE_HIT_SSDONE:
		/*
                 * We increment the nmissed count for accounting,
                 * we can also use npre/npostfault count for accounting
                 * these specific fault cases.
                 */
		kprobes_inc_nmissed_count(cur);

		/*
                 * We come here because instructions in the pre/post
                 * handler caused the page_fault, this could happen
                 * if handler tries to access user space by
                 * copy_from_user(), get_user() etc. Let the
                 * user-specified handler try to fix it first.
                 */
		if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
			return 1;

		/*
                 * In case the user-specified fault handler returned
                 * zero, try to fix up.
                 */

		entry = search_exception_tables(regs->tpc);
		if (entry) {
			regs->tpc = entry->fixup;
			regs->tnpc = regs->tpc + 4;
			return 1;
		}

		/*
                 * fixup_exception() could not handle it,
                 * Let do_page_fault() fix it.
                 */
		break;
	default:
		break;
	}

	return 0;
}


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David S. Miller4021.28%120.00%


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Anoop Thomas Mathew10.53%120.00%


Total188100.00%5100.00%



/*
 * Wrapper routine to for handling exceptions.
 */



int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
				       unsigned long val, void *data)
{
	struct die_args *args = (struct die_args *)data;
	int ret = NOTIFY_DONE;

	if (args->regs && user_mode(args->regs))
		return ret;

	switch (val) {
	case DIE_DEBUG:
		if (kprobe_handler(args->regs))
			ret = NOTIFY_STOP;
		break;
	case DIE_DEBUG_2:
		if (post_kprobe_handler(args->regs))
			ret = NOTIFY_STOP;
		break;
	default:
		break;
	}
	return ret;
}


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Ananth N. Mavinakayanahalli1212.37%120.00%


Prasanna S. Panchamukhi33.09%240.00%


Total97100.00%5100.00%






asmlinkage void __kprobes kprobe_trap(unsigned long trap_level,
				      struct pt_regs *regs)
{
	enum ctx_state prev_state = exception_enter();

	BUG_ON(trap_level != 0x170 && trap_level != 0x171);

	if (user_mode(regs)) {
		local_irq_enable();
		bad_trap(regs, trap_level);
		goto out;
	}

	/* trap_level == 0x170 --> ta 0x70
         * trap_level == 0x171 --> ta 0x71
         */
	if (notify_die((trap_level == 0x170) ? DIE_DEBUG : DIE_DEBUG_2,
		       (trap_level == 0x170) ? "debug" : "debug_2",
		       regs, 0, trap_level, SIGTRAP) != NOTIFY_STOP)
		bad_trap(regs, trap_level);
out:
	exception_exit(prev_state);
}


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Prasanna S. Panchamukhi21.89%250.00%


Total106100.00%4100.00%



/* Jprobes support.  */



int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
	struct jprobe *jp = container_of(p, struct jprobe, kp);
	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();

	memcpy(&(kcb->jprobe_saved_regs), regs, sizeof(*regs));

	regs->tpc  = (unsigned long) jp->entry;
	regs->tnpc = ((unsigned long) jp->entry) + 0x4UL;
	regs->tstate |= TSTATE_PIL;

	return 1;
}


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Total94100.00%4100.00%






void __kprobes jprobe_return(void)
{
	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
	register unsigned long orig_fp asm("g1");

	orig_fp = kcb->jprobe_saved_regs.u_regs[UREG_FP];
	__asm__ __volatile__("\n"
"1:     cmp             %%sp, %0\n\t"
        "blu,a,pt       %%xcc, 1b\n\t"
        " restore\n\t"
        ".globl         jprobe_return_trap_instruction\n"
"jprobe_return_trap_instruction:\n\t"
        "ta             0x70"
        : /* no outputs */
	: "r" (orig_fp));
}


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extern void jprobe_return_trap_instruction(void);




int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
{
	u32 *addr = (u32 *) regs->tpc;
	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();

	if (addr == (u32 *) jprobe_return_trap_instruction) {
		memcpy(regs, &(kcb->jprobe_saved_regs), sizeof(*regs));
		preempt_enable_no_resched();
		return 1;
	}
	return 0;
}


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Total75100.00%4100.00%



/* The value stored in the return address register is actually 2
 * instructions before where the callee will return to.
 * Sequences usually look something like this
 *
 *              call    some_function   <--- return register points here
 *               nop                    <--- call delay slot
 *              whatever                <--- where callee returns to
 *
 * To keep trampoline_probe_handler logic simpler, we normalize the
 * value kept in ri->ret_addr so we don't need to keep adjusting it
 * back and forth.
 */



void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
				      struct pt_regs *regs)
{
	ri->ret_addr = (kprobe_opcode_t *)(regs->u_regs[UREG_RETPC] + 8);

	/* Replace the return addr with trampoline addr */
	regs->u_regs[UREG_RETPC] =
		((unsigned long)kretprobe_trampoline) - 8;
}


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/*
 * Called when the probe at kretprobe trampoline is hit
 */



static int __kprobes trampoline_probe_handler(struct kprobe *p,
					      struct pt_regs *regs)
{
	struct kretprobe_instance *ri = NULL;
	struct hlist_head *head, empty_rp;
	struct hlist_node *tmp;
	unsigned long flags, orig_ret_address = 0;
	unsigned long trampoline_address =(unsigned long)&kretprobe_trampoline;

	INIT_HLIST_HEAD(&empty_rp);
	kretprobe_hash_lock(current, &head, &flags);

	/*
         * It is possible to have multiple instances associated with a given
         * task either because an multiple functions in the call path
         * have a return probe installed on them, and/or more than one return
         * return probe was registered for a target function.
         *
         * We can handle this because:
         *     - instances are always inserted at the head of the list
         *     - when multiple return probes are registered for the same
         *       function, the first instance's ret_addr will point to the
         *       real return address, and all the rest will point to
         *       kretprobe_trampoline
         */
	hlist_for_each_entry_safe(ri, tmp, head, hlist) {
		if (ri->task != current)
			/* another task is sharing our hash bucket */
			continue;

		if (ri->rp && ri->rp->handler)
			ri->rp->handler(ri, regs);

		orig_ret_address = (unsigned long)ri->ret_addr;
		recycle_rp_inst(ri, &empty_rp);

		if (orig_ret_address != trampoline_address)
			/*
                         * This is the real return address. Any other
                         * instances associated with this task are for
                         * other calls deeper on the call stack
                         */
			break;
	}

	kretprobe_assert(ri, orig_ret_address, trampoline_address);
	regs->tpc = orig_ret_address;
	regs->tnpc = orig_ret_address + 4;

	reset_current_kprobe();
	kretprobe_hash_unlock(current, &flags);
	preempt_enable_no_resched();

	hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) {
		hlist_del(&ri->hlist);
		kfree(ri);
	}
	/*
         * By returning a non-zero value, we are telling
         * kprobe_handler() that we don't want the post_handler
         * to run (and have re-enabled preemption)
         */
	return 1;
}


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Frederik Schwarzer10.48%125.00%


Total210100.00%4100.00%






static void __used kretprobe_trampoline_holder(void)
{
	asm volatile(".global kretprobe_trampoline\n"
                     "kretprobe_trampoline:\n"
                     "\tnop\n"
                     "\tnop\n");
}

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Sam Ravnborg216.67%150.00%


Total12100.00%2100.00%




static struct kprobe trampoline_p = {
	.addr = (kprobe_opcode_t *) &kretprobe_trampoline,
	.pre_handler = trampoline_probe_handler
};




int __init arch_init_kprobes(void)
{
	return register_kprobe(&trampoline_p);
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller853.33%150.00%


Rusty Lynch746.67%150.00%


Total15100.00%2100.00%






int __kprobes arch_trampoline_kprobe(struct kprobe *p)
{
	if (p->addr == (kprobe_opcode_t *)&kretprobe_trampoline)
		return 1;

	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
David S. Miller2790.00%150.00%


Rusty Lynch310.00%150.00%


Total30100.00%2100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
David S. Miller139764.83%514.71%


Prasanna S. Panchamukhi32014.85%720.59%


Ananth N. Mavinakayanahalli25912.02%411.76%


Rusty Lynch753.48%25.88%


Anil S Keshavamurthy271.25%38.82%


Kirill V Tkhai200.93%12.94%


Bibo Mao160.74%12.94%


Masami Hiramatsu130.60%12.94%


Srinivasa D S90.42%12.94%


Christoph Lameter70.32%12.94%


Sam Ravnborg30.14%12.94%


Tejun Heo30.14%12.94%


Christoph Hellwig10.05%12.94%


Anoop Thomas Mathew10.05%12.94%


Greg Kroah-Hartman10.05%12.94%


Paul Gortmaker10.05%12.94%


Frederik Schwarzer10.05%12.94%


Linus Torvalds10.05%12.94%


Total2155100.00%34100.00%


Directory: arch/sparc/kernel



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