mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-10-31 08:08:51 +01:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
628
arch/arm/kernel/kprobes.c
Normal file
628
arch/arm/kernel/kprobes.c
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@ -0,0 +1,628 @@
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/*
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* arch/arm/kernel/kprobes.c
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*
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* Kprobes on ARM
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*
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* Abhishek Sagar <sagar.abhishek@gmail.com>
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* Copyright (C) 2006, 2007 Motorola Inc.
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*
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* Nicolas Pitre <nico@marvell.com>
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* Copyright (C) 2007 Marvell Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/stop_machine.h>
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#include <linux/stringify.h>
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#include <asm/traps.h>
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#include <asm/opcodes.h>
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#include <asm/cacheflush.h>
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#include <linux/percpu.h>
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#include <linux/bug.h>
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#include "kprobes.h"
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#include "probes-arm.h"
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#include "probes-thumb.h"
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#include "patch.h"
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#define MIN_STACK_SIZE(addr) \
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min((unsigned long)MAX_STACK_SIZE, \
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(unsigned long)current_thread_info() + THREAD_START_SP - (addr))
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#define flush_insns(addr, size) \
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flush_icache_range((unsigned long)(addr), \
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(unsigned long)(addr) + \
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(size))
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/* Used as a marker in ARM_pc to note when we're in a jprobe. */
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#define JPROBE_MAGIC_ADDR 0xffffffff
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DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
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DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
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int __kprobes arch_prepare_kprobe(struct kprobe *p)
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{
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kprobe_opcode_t insn;
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kprobe_opcode_t tmp_insn[MAX_INSN_SIZE];
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unsigned long addr = (unsigned long)p->addr;
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bool thumb;
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kprobe_decode_insn_t *decode_insn;
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const union decode_action *actions;
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int is;
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if (in_exception_text(addr))
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return -EINVAL;
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#ifdef CONFIG_THUMB2_KERNEL
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thumb = true;
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addr &= ~1; /* Bit 0 would normally be set to indicate Thumb code */
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insn = __mem_to_opcode_thumb16(((u16 *)addr)[0]);
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if (is_wide_instruction(insn)) {
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u16 inst2 = __mem_to_opcode_thumb16(((u16 *)addr)[1]);
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insn = __opcode_thumb32_compose(insn, inst2);
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decode_insn = thumb32_probes_decode_insn;
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actions = kprobes_t32_actions;
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} else {
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decode_insn = thumb16_probes_decode_insn;
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actions = kprobes_t16_actions;
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}
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#else /* !CONFIG_THUMB2_KERNEL */
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thumb = false;
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if (addr & 0x3)
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return -EINVAL;
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insn = __mem_to_opcode_arm(*p->addr);
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decode_insn = arm_probes_decode_insn;
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actions = kprobes_arm_actions;
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#endif
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p->opcode = insn;
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p->ainsn.insn = tmp_insn;
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switch ((*decode_insn)(insn, &p->ainsn, true, actions)) {
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case INSN_REJECTED: /* not supported */
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return -EINVAL;
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case INSN_GOOD: /* instruction uses slot */
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p->ainsn.insn = get_insn_slot();
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if (!p->ainsn.insn)
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return -ENOMEM;
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for (is = 0; is < MAX_INSN_SIZE; ++is)
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p->ainsn.insn[is] = tmp_insn[is];
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flush_insns(p->ainsn.insn,
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sizeof(p->ainsn.insn[0]) * MAX_INSN_SIZE);
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p->ainsn.insn_fn = (probes_insn_fn_t *)
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((uintptr_t)p->ainsn.insn | thumb);
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break;
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case INSN_GOOD_NO_SLOT: /* instruction doesn't need insn slot */
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p->ainsn.insn = NULL;
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break;
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}
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return 0;
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}
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void __kprobes arch_arm_kprobe(struct kprobe *p)
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{
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unsigned int brkp;
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void *addr;
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if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) {
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/* Remove any Thumb flag */
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addr = (void *)((uintptr_t)p->addr & ~1);
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if (is_wide_instruction(p->opcode))
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brkp = KPROBE_THUMB32_BREAKPOINT_INSTRUCTION;
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else
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brkp = KPROBE_THUMB16_BREAKPOINT_INSTRUCTION;
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} else {
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kprobe_opcode_t insn = p->opcode;
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addr = p->addr;
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brkp = KPROBE_ARM_BREAKPOINT_INSTRUCTION;
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if (insn >= 0xe0000000)
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brkp |= 0xe0000000; /* Unconditional instruction */
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else
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brkp |= insn & 0xf0000000; /* Copy condition from insn */
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}
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patch_text(addr, brkp);
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}
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/*
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* The actual disarming is done here on each CPU and synchronized using
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* stop_machine. This synchronization is necessary on SMP to avoid removing
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* a probe between the moment the 'Undefined Instruction' exception is raised
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* and the moment the exception handler reads the faulting instruction from
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* memory. It is also needed to atomically set the two half-words of a 32-bit
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* Thumb breakpoint.
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*/
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int __kprobes __arch_disarm_kprobe(void *p)
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{
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struct kprobe *kp = p;
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void *addr = (void *)((uintptr_t)kp->addr & ~1);
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__patch_text(addr, kp->opcode);
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return 0;
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}
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void __kprobes arch_disarm_kprobe(struct kprobe *p)
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{
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stop_machine(__arch_disarm_kprobe, p, cpu_online_mask);
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}
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void __kprobes arch_remove_kprobe(struct kprobe *p)
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{
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if (p->ainsn.insn) {
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free_insn_slot(p->ainsn.insn, 0);
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p->ainsn.insn = NULL;
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}
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}
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static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
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{
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kcb->prev_kprobe.kp = kprobe_running();
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kcb->prev_kprobe.status = kcb->kprobe_status;
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}
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static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
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{
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__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
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kcb->kprobe_status = kcb->prev_kprobe.status;
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}
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static void __kprobes set_current_kprobe(struct kprobe *p)
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{
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__this_cpu_write(current_kprobe, p);
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}
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static void __kprobes
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singlestep_skip(struct kprobe *p, struct pt_regs *regs)
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{
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#ifdef CONFIG_THUMB2_KERNEL
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regs->ARM_cpsr = it_advance(regs->ARM_cpsr);
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if (is_wide_instruction(p->opcode))
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regs->ARM_pc += 4;
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else
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regs->ARM_pc += 2;
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#else
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regs->ARM_pc += 4;
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#endif
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}
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static inline void __kprobes
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singlestep(struct kprobe *p, struct pt_regs *regs, struct kprobe_ctlblk *kcb)
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{
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p->ainsn.insn_singlestep(p->opcode, &p->ainsn, regs);
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}
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/*
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* Called with IRQs disabled. IRQs must remain disabled from that point
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* all the way until processing this kprobe is complete. The current
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* kprobes implementation cannot process more than one nested level of
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* kprobe, and that level is reserved for user kprobe handlers, so we can't
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* risk encountering a new kprobe in an interrupt handler.
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*/
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void __kprobes kprobe_handler(struct pt_regs *regs)
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{
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struct kprobe *p, *cur;
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struct kprobe_ctlblk *kcb;
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kcb = get_kprobe_ctlblk();
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cur = kprobe_running();
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#ifdef CONFIG_THUMB2_KERNEL
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/*
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* First look for a probe which was registered using an address with
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* bit 0 set, this is the usual situation for pointers to Thumb code.
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* If not found, fallback to looking for one with bit 0 clear.
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*/
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p = get_kprobe((kprobe_opcode_t *)(regs->ARM_pc | 1));
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if (!p)
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p = get_kprobe((kprobe_opcode_t *)regs->ARM_pc);
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#else /* ! CONFIG_THUMB2_KERNEL */
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p = get_kprobe((kprobe_opcode_t *)regs->ARM_pc);
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#endif
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if (p) {
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if (cur) {
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/* Kprobe is pending, so we're recursing. */
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switch (kcb->kprobe_status) {
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case KPROBE_HIT_ACTIVE:
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case KPROBE_HIT_SSDONE:
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/* A pre- or post-handler probe got us here. */
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kprobes_inc_nmissed_count(p);
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save_previous_kprobe(kcb);
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set_current_kprobe(p);
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kcb->kprobe_status = KPROBE_REENTER;
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singlestep(p, regs, kcb);
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restore_previous_kprobe(kcb);
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break;
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default:
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/* impossible cases */
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BUG();
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}
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} else if (p->ainsn.insn_check_cc(regs->ARM_cpsr)) {
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/* Probe hit and conditional execution check ok. */
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set_current_kprobe(p);
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kcb->kprobe_status = KPROBE_HIT_ACTIVE;
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/*
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* If we have no pre-handler or it returned 0, we
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* continue with normal processing. If we have a
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* pre-handler and it returned non-zero, it prepped
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* for calling the break_handler below on re-entry,
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* so get out doing nothing more here.
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*/
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if (!p->pre_handler || !p->pre_handler(p, regs)) {
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kcb->kprobe_status = KPROBE_HIT_SS;
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singlestep(p, regs, kcb);
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if (p->post_handler) {
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kcb->kprobe_status = KPROBE_HIT_SSDONE;
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p->post_handler(p, regs, 0);
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}
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reset_current_kprobe();
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}
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} else {
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/*
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* Probe hit but conditional execution check failed,
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* so just skip the instruction and continue as if
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* nothing had happened.
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*/
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singlestep_skip(p, regs);
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}
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} else if (cur) {
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/* We probably hit a jprobe. Call its break handler. */
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if (cur->break_handler && cur->break_handler(cur, regs)) {
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kcb->kprobe_status = KPROBE_HIT_SS;
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singlestep(cur, regs, kcb);
|
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if (cur->post_handler) {
|
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kcb->kprobe_status = KPROBE_HIT_SSDONE;
|
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cur->post_handler(cur, regs, 0);
|
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}
|
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}
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reset_current_kprobe();
|
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} else {
|
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/*
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* The probe was removed and a race is in progress.
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* There is nothing we can do about it. Let's restart
|
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* the instruction. By the time we can restart, the
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* real instruction will be there.
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*/
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}
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}
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static int __kprobes kprobe_trap_handler(struct pt_regs *regs, unsigned int instr)
|
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{
|
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unsigned long flags;
|
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local_irq_save(flags);
|
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kprobe_handler(regs);
|
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local_irq_restore(flags);
|
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return 0;
|
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}
|
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|
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int __kprobes kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr)
|
||||
{
|
||||
struct kprobe *cur = kprobe_running();
|
||||
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
|
||||
|
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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 PC to point back to the probe address
|
||||
* and allow the page fault handler to continue as a
|
||||
* normal page fault.
|
||||
*/
|
||||
regs->ARM_pc = (long)cur->addr;
|
||||
if (kcb->kprobe_status == KPROBE_REENTER) {
|
||||
restore_previous_kprobe(kcb);
|
||||
} else {
|
||||
reset_current_kprobe();
|
||||
}
|
||||
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.
|
||||
*/
|
||||
if (cur->fault_handler && cur->fault_handler(cur, regs, fsr))
|
||||
return 1;
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
|
||||
unsigned long val, void *data)
|
||||
{
|
||||
/*
|
||||
* notify_die() is currently never called on ARM,
|
||||
* so this callback is currently empty.
|
||||
*/
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
/*
|
||||
* When a retprobed function returns, trampoline_handler() is called,
|
||||
* calling the kretprobe's handler. We construct a struct pt_regs to
|
||||
* give a view of registers r0-r11 to the user return-handler. This is
|
||||
* not a complete pt_regs structure, but that should be plenty sufficient
|
||||
* for kretprobe handlers which should normally be interested in r0 only
|
||||
* anyway.
|
||||
*/
|
||||
void __naked __kprobes kretprobe_trampoline(void)
|
||||
{
|
||||
__asm__ __volatile__ (
|
||||
"stmdb sp!, {r0 - r11} \n\t"
|
||||
"mov r0, sp \n\t"
|
||||
"bl trampoline_handler \n\t"
|
||||
"mov lr, r0 \n\t"
|
||||
"ldmia sp!, {r0 - r11} \n\t"
|
||||
#ifdef CONFIG_THUMB2_KERNEL
|
||||
"bx lr \n\t"
|
||||
#else
|
||||
"mov pc, lr \n\t"
|
||||
#endif
|
||||
: : : "memory");
|
||||
}
|
||||
|
||||
/* Called from kretprobe_trampoline */
|
||||
static __used __kprobes void *trampoline_handler(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 multiple functions in the call path have
|
||||
* a return probe installed on them, and/or more than one 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) {
|
||||
__this_cpu_write(current_kprobe, &ri->rp->kp);
|
||||
get_kprobe_ctlblk()->kprobe_status = KPROBE_HIT_ACTIVE;
|
||||
ri->rp->handler(ri, regs);
|
||||
__this_cpu_write(current_kprobe, NULL);
|
||||
}
|
||||
|
||||
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);
|
||||
kretprobe_hash_unlock(current, &flags);
|
||||
|
||||
hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) {
|
||||
hlist_del(&ri->hlist);
|
||||
kfree(ri);
|
||||
}
|
||||
|
||||
return (void *)orig_ret_address;
|
||||
}
|
||||
|
||||
void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
ri->ret_addr = (kprobe_opcode_t *)regs->ARM_lr;
|
||||
|
||||
/* Replace the return addr with trampoline addr. */
|
||||
regs->ARM_lr = (unsigned long)&kretprobe_trampoline;
|
||||
}
|
||||
|
||||
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();
|
||||
long sp_addr = regs->ARM_sp;
|
||||
long cpsr;
|
||||
|
||||
kcb->jprobe_saved_regs = *regs;
|
||||
memcpy(kcb->jprobes_stack, (void *)sp_addr, MIN_STACK_SIZE(sp_addr));
|
||||
regs->ARM_pc = (long)jp->entry;
|
||||
|
||||
cpsr = regs->ARM_cpsr | PSR_I_BIT;
|
||||
#ifdef CONFIG_THUMB2_KERNEL
|
||||
/* Set correct Thumb state in cpsr */
|
||||
if (regs->ARM_pc & 1)
|
||||
cpsr |= PSR_T_BIT;
|
||||
else
|
||||
cpsr &= ~PSR_T_BIT;
|
||||
#endif
|
||||
regs->ARM_cpsr = cpsr;
|
||||
|
||||
preempt_disable();
|
||||
return 1;
|
||||
}
|
||||
|
||||
void __kprobes jprobe_return(void)
|
||||
{
|
||||
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
|
||||
|
||||
__asm__ __volatile__ (
|
||||
/*
|
||||
* Setup an empty pt_regs. Fill SP and PC fields as
|
||||
* they're needed by longjmp_break_handler.
|
||||
*
|
||||
* We allocate some slack between the original SP and start of
|
||||
* our fabricated regs. To be precise we want to have worst case
|
||||
* covered which is STMFD with all 16 regs so we allocate 2 *
|
||||
* sizeof(struct_pt_regs)).
|
||||
*
|
||||
* This is to prevent any simulated instruction from writing
|
||||
* over the regs when they are accessing the stack.
|
||||
*/
|
||||
#ifdef CONFIG_THUMB2_KERNEL
|
||||
"sub r0, %0, %1 \n\t"
|
||||
"mov sp, r0 \n\t"
|
||||
#else
|
||||
"sub sp, %0, %1 \n\t"
|
||||
#endif
|
||||
"ldr r0, ="__stringify(JPROBE_MAGIC_ADDR)"\n\t"
|
||||
"str %0, [sp, %2] \n\t"
|
||||
"str r0, [sp, %3] \n\t"
|
||||
"mov r0, sp \n\t"
|
||||
"bl kprobe_handler \n\t"
|
||||
|
||||
/*
|
||||
* Return to the context saved by setjmp_pre_handler
|
||||
* and restored by longjmp_break_handler.
|
||||
*/
|
||||
#ifdef CONFIG_THUMB2_KERNEL
|
||||
"ldr lr, [sp, %2] \n\t" /* lr = saved sp */
|
||||
"ldrd r0, r1, [sp, %5] \n\t" /* r0,r1 = saved lr,pc */
|
||||
"ldr r2, [sp, %4] \n\t" /* r2 = saved psr */
|
||||
"stmdb lr!, {r0, r1, r2} \n\t" /* push saved lr and */
|
||||
/* rfe context */
|
||||
"ldmia sp, {r0 - r12} \n\t"
|
||||
"mov sp, lr \n\t"
|
||||
"ldr lr, [sp], #4 \n\t"
|
||||
"rfeia sp! \n\t"
|
||||
#else
|
||||
"ldr r0, [sp, %4] \n\t"
|
||||
"msr cpsr_cxsf, r0 \n\t"
|
||||
"ldmia sp, {r0 - pc} \n\t"
|
||||
#endif
|
||||
:
|
||||
: "r" (kcb->jprobe_saved_regs.ARM_sp),
|
||||
"I" (sizeof(struct pt_regs) * 2),
|
||||
"J" (offsetof(struct pt_regs, ARM_sp)),
|
||||
"J" (offsetof(struct pt_regs, ARM_pc)),
|
||||
"J" (offsetof(struct pt_regs, ARM_cpsr)),
|
||||
"J" (offsetof(struct pt_regs, ARM_lr))
|
||||
: "memory", "cc");
|
||||
}
|
||||
|
||||
int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
|
||||
{
|
||||
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
|
||||
long stack_addr = kcb->jprobe_saved_regs.ARM_sp;
|
||||
long orig_sp = regs->ARM_sp;
|
||||
struct jprobe *jp = container_of(p, struct jprobe, kp);
|
||||
|
||||
if (regs->ARM_pc == JPROBE_MAGIC_ADDR) {
|
||||
if (orig_sp != stack_addr) {
|
||||
struct pt_regs *saved_regs =
|
||||
(struct pt_regs *)kcb->jprobe_saved_regs.ARM_sp;
|
||||
printk("current sp %lx does not match saved sp %lx\n",
|
||||
orig_sp, stack_addr);
|
||||
printk("Saved registers for jprobe %p\n", jp);
|
||||
show_regs(saved_regs);
|
||||
printk("Current registers\n");
|
||||
show_regs(regs);
|
||||
BUG();
|
||||
}
|
||||
*regs = kcb->jprobe_saved_regs;
|
||||
memcpy((void *)stack_addr, kcb->jprobes_stack,
|
||||
MIN_STACK_SIZE(stack_addr));
|
||||
preempt_enable_no_resched();
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int __kprobes arch_trampoline_kprobe(struct kprobe *p)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_THUMB2_KERNEL
|
||||
|
||||
static struct undef_hook kprobes_thumb16_break_hook = {
|
||||
.instr_mask = 0xffff,
|
||||
.instr_val = KPROBE_THUMB16_BREAKPOINT_INSTRUCTION,
|
||||
.cpsr_mask = MODE_MASK,
|
||||
.cpsr_val = SVC_MODE,
|
||||
.fn = kprobe_trap_handler,
|
||||
};
|
||||
|
||||
static struct undef_hook kprobes_thumb32_break_hook = {
|
||||
.instr_mask = 0xffffffff,
|
||||
.instr_val = KPROBE_THUMB32_BREAKPOINT_INSTRUCTION,
|
||||
.cpsr_mask = MODE_MASK,
|
||||
.cpsr_val = SVC_MODE,
|
||||
.fn = kprobe_trap_handler,
|
||||
};
|
||||
|
||||
#else /* !CONFIG_THUMB2_KERNEL */
|
||||
|
||||
static struct undef_hook kprobes_arm_break_hook = {
|
||||
.instr_mask = 0x0fffffff,
|
||||
.instr_val = KPROBE_ARM_BREAKPOINT_INSTRUCTION,
|
||||
.cpsr_mask = MODE_MASK,
|
||||
.cpsr_val = SVC_MODE,
|
||||
.fn = kprobe_trap_handler,
|
||||
};
|
||||
|
||||
#endif /* !CONFIG_THUMB2_KERNEL */
|
||||
|
||||
int __init arch_init_kprobes()
|
||||
{
|
||||
arm_probes_decode_init();
|
||||
#ifdef CONFIG_THUMB2_KERNEL
|
||||
register_undef_hook(&kprobes_thumb16_break_hook);
|
||||
register_undef_hook(&kprobes_thumb32_break_hook);
|
||||
#else
|
||||
register_undef_hook(&kprobes_arm_break_hook);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue