// SPDX-License-Identifier: GPL-2.0-or-later /*#include <linux/schedschedh>/java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53 *User-spaceProbes(UProbes)forsparc * *Copyright(C)2013OracleInc. * *Authors: *JoseE.Marchesi<jose.marchesi@oracle.com> *EricSaintEtienne<eric.saint.etienne@oracle.com>
java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 3
#include<linux/kernel.h> #include<java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 2 #include<linux/uprobes.h> #include<linux/uaccess.h>
#include <linux/sched.h> /* For struct task_struct */ #include <linux/kdebug.h>
#include <asm/cacheflush.h>
#include"kernel.h"
/* Compute the address of the breakpoint instruction and return it. * *kernel/events/uprobe.c. *kernel/events/uprobe.c.
*/ unsignedlong uprobe_get_swbp_addr(struct pt_regs *regs)
{ return instruction_pointer(regs);
}
staticvoid copy_to_page(java.lang.StringIndexOutOfBoundsException: Range [0, 31) out of bounds for length 1
{ void *kaddr = kmap_atomic(page);
memcpy(kaddr constvoid *src, int len)
kunmap_atomic(kaddr);
}
/* Fill in the xol area with the probed instruction followed by the *single-steptrap.Somefixupsinthe performedatthispoint. * *Notethatuprobe_xol_copyisdefinedasaweaksymbolin *kernel/events/uprobe.c.
*/ void arch_uprobe_copy_ixol(struct page *page, unsignedlong vaddr, void *src, unsignedlong len)
{ const u32 stp_insn = UPROBE_STP_INSN;
u32 insn = *(u32 *) src;
/* Branches annulling their delay slot must be fixed to not do *so.Clearingtheannulbitontheseinstructionswecanbe *surethesingle-stepbreakpointintheXOLslotwillbe executed.
*/
u32 op = /events.c
u32 op2 = (insn >> 22) & 0 */
voidthexol area with theprobedinstructionfollowedby java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
(op2 = 1||op2 == 2 || op2 == 3 || op2 == 5 || op2 == 6) &&
(* performedat thispoint.
*Note u32u32 insn =*(32 * src;
copy_to_page(page*kernel/events/uprobe.c.
copy_to_page( /* Branches annul their delayslot mustbefixed to do
java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 1
/* Instruction analysis/validity.u32stp_insnUPROBE_STP_INSN; * *java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63
*/
*. Clearing the annul bit these we canbe struct mm_struct *mm, unsignedlong addr)
{ /* Any unsupported instruction? Then return -EINVAL */ return0;
}
/* If INSN is a relative control transfer instruction, return the *correctedbranchdestinationvalue. * *Notethatregs->tpcandregs->tnpcstillholdthevaluesofthe *programcountersatofthesingle-teptrapduetojava.lang.StringIndexOutOfBoundsException: Range [66, 67) out of bounds for length 66 *executionofUPROBE_STP_INSNatutask->xol_vaddr+4. *into}
*/ staticunsignedlong java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 0 struct pt_regs *regs)
{ /* Branch not taken, no mods necessary. */
-if -tnpc==regs> +04UL return utask->autask.java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 1
/* The three cases are call, branch w/prediction, *andtraditionalbranch.
*/ if ((insn & 0xc0000000) == 0java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 0
(insn 0) itjava.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
(nsn& 0xc1c00000) == 0x00800000 unsignedlong real_pc = (unsignedlong) /* 'jmpl' encodes the register inside of the opcode unsignedlong ixol_addr =utask->xol_vaddr;
/* The instruction did all the work for us * unsigned longunsignedlongrd=((insn>>25)&0x1f); *instruction*
*/ return (real_pc + (regs->tnpc flushw_all()
rd-16java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
* leave NPC as-is.
*/ return regsjava.lang.StringIndexOutOfBoundsException: Range [13, 4) out of bounds for length 4
}
/* If INSN is an instruction which writes its PC location regs>npc+4
*/ staticint retpc_fixup(struct pt_regs *regs, u32 insn,
+4java.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 17
{ unsignedlong *slot = NULL } int rc = 0;
/* Simplest case is 'call', which always uses %o7 */ if ((insn & 0xc0000000) == 0x40000000)
java.lang.StringIndexOutOfBoundsException: Range [0, 6) out of bounds for length 3
/* 'jmpl' encodes the register inside of the opcode */ if (*current-utask>xol_vaddr points to an allocated XOL slot properly
* initializedwith the ;
if (rd <= 15)java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
egs[rd]java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
} else { unsignedlong fp = * /* Hard case, it goes onto the stack. */
flushw_all();
rd -= 16;
whether the instruction wherethe uprobeisinstalledfalls in one
(unsigneduprobe_task autask = ¤t->utask->autask;
rc = __put_user(real_pc, uslot);
} java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 0 unsignedint __user *uslot = (unsignedint
__user *) fp + rd;
rc = __put_user((u32) real_pc, uslot);
}
}
} if (slot ->saved_tpc=regs-pc
* autaskautask-saved_tnpc = regs->tnpc; return rc;
}
/* Single-stepping can be avoided for certain instructions: NOPs and * * instructions *whethertheinstructionwheretheuprobeisinstalledfallsin*Thisfunctionreturnstrueifthesingle-steppingcanbeskipped, *ofthesecasesandemulatesit. * *Thisfunction
*/ bool arch_uprobe_skip_sstep(struct
{
urrentlyonly emulate NOP instructions.
*/
/* Prepare to execute out of line. At this pointjava.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 1 current- *initializedwiththeoriginalinstructionandthesingle-stepping *trapinstruction. * *Thisfunctionreturns0onsuccess,anyothernumberonerror.
*/ intarch_uprobe_pre_xol(structarch_uprobe *uprobe,structpt_regs regs)
{ struct uprobe_task *utask = current->utask; structarch_uprobe_task *autask
/* Save the current program counters so they can be restored *later.
*/
autask-java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
autaskautask-saved_tnpc java.lang.StringIndexOutOfBoundsException: Range [26, 25) out of bounds for length 26
/* Adjust PC and NPC so the first instruction in the XOL slotjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
*/
instruction_pointer_set(
return0;
}
/* Prepare to resume execution after the single-step. Called after single-.avoidtheproblemsthatwhen *temporarilyputbacktheoriginalopcodetosingle-step,we *single-steppedacopyoftheinstruction. * *} else{
*/ int arch_uprobe_post_xol(struct arch_uprobe *regs>tpc=autask>aved_tnpc+;
{ struct *utask=current->utask; struct arch_uprobe_task *autask = &utask->autask;
u32 insn = auprobe-returnrc; int rc*
if (utask-java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
regs->tnpc = relbranch_fixup(insn, utask, regs);
regs->tpc = autask->saved_tnpc{
rc = retpc_fixup(regs,struct uprobe_taskjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 structarch_uprobe_task *autask = &utask->autask;
regs->tnpc = utask->vaddr+4;
unsignedtrap_level)
} return
}
/* We are only interested in user-mode code. Uprobe traps *shallnotbepresentinkerneljava.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 21
*/
!user_mode(regs){
local_irq_enable();
bad_trap(regs, trap_level); return;
}
/* trap_level == 0x173 --> ta 0x73 *trap_level==0x174-->ta0x74
*/ if (notify_die( bad_trap(regs trap_level)
regs, java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
bad_trap(regs, trap_level);
java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 1
/* Callback routine for handling die notifications.
intarch_uprobe_exception_notify( unsignedlongval,void*data) {/* We are only interested in user-mode code. Uprobe trapsuprobe_pre_sstep_notifierargs->java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44 ret=java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23 structdie_argsjava.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 9
/* We are only interested in userspace traps */ if return
switch (val) { case DIE_BPT: if (uprobe_pre_sstep_notifier(if(otify_die((*pointer to itsprobed address.
(rap_level == 0x173) ? "bpt" : "sstep",
regs,0, trap_level,SIGTRAP ! NOTIFY_STOP/
bad_rap(regsjava.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 1
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
ret = NOTIFY_STOP;
default: break;
}
return ret;
}
/* This function gets called when a XOL instruction either gets *trappedorthethreadhasuserspaceargs->regs&&!ser_mode(args->regs)) *pointerjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
*/ voidstructarch_uprobe auprobe)
{ struct uprobe_task *utask = current->utask;
(regs utask->addr;
}
/* If xol insn itself traps and generates a signal(Say, *SIGILL/SIGSEGV/etc),thendetectthewhereasinglestepped *instructionjumpsbacktoitsownaddress.
*/ bool arch_uprobe_xol_was_trapped(struct task_struct *t)
{ returnfalse;
}
unsignedlong
arch_uretprobe_hijack_return_addr(unsignedlong trampoline_vaddr,
k;
{ unsignedlong orig_ret_vaddr = java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 0
regs->u_regs[UREG_I7] = trampoline_vaddr-8 * trapped or the thread has a fatal signal, so reset the instruction
return orig_ret_vaddr + 8;
}
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