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d124e48469
tsk is only used as an intermediate variable for current. Remove tsk and use current directly instead at the only place where it is used. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
596 lines
16 KiB
C
596 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* S390 version
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* Copyright IBM Corp. 1999
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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* Ulrich Weigand (uweigand@de.ibm.com)
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*
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* Derived from "arch/i386/mm/fault.c"
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/kernel_stat.h>
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#include <linux/mmu_context.h>
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#include <linux/perf_event.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/jump_label.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/compat.h>
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#include <linux/smp.h>
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#include <linux/kdebug.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/extable.h>
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#include <linux/hardirq.h>
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#include <linux/kprobes.h>
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#include <linux/uaccess.h>
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#include <linux/hugetlb.h>
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#include <linux/kfence.h>
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#include <asm/asm-extable.h>
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#include <asm/asm-offsets.h>
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#include <asm/ptrace.h>
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#include <asm/fault.h>
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#include <asm/diag.h>
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#include <asm/gmap.h>
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#include <asm/irq.h>
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#include <asm/facility.h>
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#include <asm/uv.h>
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#include "../kernel/entry.h"
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enum fault_type {
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KERNEL_FAULT,
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USER_FAULT,
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GMAP_FAULT,
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};
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static DEFINE_STATIC_KEY_FALSE(have_store_indication);
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static int __init fault_init(void)
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{
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if (test_facility(75))
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static_branch_enable(&have_store_indication);
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return 0;
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}
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early_initcall(fault_init);
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/*
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* Find out which address space caused the exception.
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*/
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static enum fault_type get_fault_type(struct pt_regs *regs)
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{
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union teid teid = { .val = regs->int_parm_long };
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if (likely(teid.as == PSW_BITS_AS_PRIMARY)) {
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if (user_mode(regs))
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return USER_FAULT;
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if (!IS_ENABLED(CONFIG_PGSTE))
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return KERNEL_FAULT;
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if (test_pt_regs_flag(regs, PIF_GUEST_FAULT))
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return GMAP_FAULT;
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return KERNEL_FAULT;
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}
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if (teid.as == PSW_BITS_AS_SECONDARY)
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return USER_FAULT;
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/* Access register mode, not used in the kernel */
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if (teid.as == PSW_BITS_AS_ACCREG)
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return USER_FAULT;
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/* Home space -> access via kernel ASCE */
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return KERNEL_FAULT;
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}
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static unsigned long get_fault_address(struct pt_regs *regs)
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{
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union teid teid = { .val = regs->int_parm_long };
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return teid.addr * PAGE_SIZE;
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}
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static __always_inline bool fault_is_write(struct pt_regs *regs)
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{
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union teid teid = { .val = regs->int_parm_long };
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if (static_branch_likely(&have_store_indication))
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return teid.fsi == TEID_FSI_STORE;
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return false;
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}
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static void dump_pagetable(unsigned long asce, unsigned long address)
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{
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unsigned long entry, *table = __va(asce & _ASCE_ORIGIN);
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pr_alert("AS:%016lx ", asce);
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switch (asce & _ASCE_TYPE_MASK) {
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case _ASCE_TYPE_REGION1:
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table += (address & _REGION1_INDEX) >> _REGION1_SHIFT;
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if (get_kernel_nofault(entry, table))
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goto bad;
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pr_cont("R1:%016lx ", entry);
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if (entry & _REGION_ENTRY_INVALID)
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goto out;
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table = __va(entry & _REGION_ENTRY_ORIGIN);
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fallthrough;
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case _ASCE_TYPE_REGION2:
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table += (address & _REGION2_INDEX) >> _REGION2_SHIFT;
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if (get_kernel_nofault(entry, table))
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goto bad;
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pr_cont("R2:%016lx ", entry);
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if (entry & _REGION_ENTRY_INVALID)
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goto out;
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table = __va(entry & _REGION_ENTRY_ORIGIN);
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fallthrough;
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case _ASCE_TYPE_REGION3:
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table += (address & _REGION3_INDEX) >> _REGION3_SHIFT;
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if (get_kernel_nofault(entry, table))
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goto bad;
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pr_cont("R3:%016lx ", entry);
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if (entry & (_REGION_ENTRY_INVALID | _REGION3_ENTRY_LARGE))
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goto out;
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table = __va(entry & _REGION_ENTRY_ORIGIN);
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fallthrough;
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case _ASCE_TYPE_SEGMENT:
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table += (address & _SEGMENT_INDEX) >> _SEGMENT_SHIFT;
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if (get_kernel_nofault(entry, table))
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goto bad;
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pr_cont("S:%016lx ", entry);
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if (entry & (_SEGMENT_ENTRY_INVALID | _SEGMENT_ENTRY_LARGE))
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goto out;
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table = __va(entry & _SEGMENT_ENTRY_ORIGIN);
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}
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table += (address & _PAGE_INDEX) >> _PAGE_SHIFT;
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if (get_kernel_nofault(entry, table))
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goto bad;
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pr_cont("P:%016lx ", entry);
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out:
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pr_cont("\n");
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return;
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bad:
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pr_cont("BAD\n");
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}
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static void dump_fault_info(struct pt_regs *regs)
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{
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union teid teid = { .val = regs->int_parm_long };
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unsigned long asce;
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pr_alert("Failing address: %016lx TEID: %016lx\n",
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get_fault_address(regs), teid.val);
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pr_alert("Fault in ");
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switch (teid.as) {
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case PSW_BITS_AS_HOME:
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pr_cont("home space ");
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break;
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case PSW_BITS_AS_SECONDARY:
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pr_cont("secondary space ");
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break;
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case PSW_BITS_AS_ACCREG:
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pr_cont("access register ");
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break;
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case PSW_BITS_AS_PRIMARY:
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pr_cont("primary space ");
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break;
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}
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pr_cont("mode while using ");
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switch (get_fault_type(regs)) {
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case USER_FAULT:
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asce = S390_lowcore.user_asce.val;
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pr_cont("user ");
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break;
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case GMAP_FAULT:
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asce = ((struct gmap *)S390_lowcore.gmap)->asce;
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pr_cont("gmap ");
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break;
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case KERNEL_FAULT:
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asce = S390_lowcore.kernel_asce.val;
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pr_cont("kernel ");
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break;
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default:
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unreachable();
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}
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pr_cont("ASCE.\n");
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dump_pagetable(asce, get_fault_address(regs));
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}
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int show_unhandled_signals = 1;
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void report_user_fault(struct pt_regs *regs, long signr, int is_mm_fault)
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{
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static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);
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if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
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return;
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if (!unhandled_signal(current, signr))
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return;
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if (!__ratelimit(&rs))
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return;
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pr_alert("User process fault: interruption code %04x ilc:%d ",
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regs->int_code & 0xffff, regs->int_code >> 17);
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print_vma_addr(KERN_CONT "in ", regs->psw.addr);
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pr_cont("\n");
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if (is_mm_fault)
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dump_fault_info(regs);
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show_regs(regs);
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}
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static void do_sigsegv(struct pt_regs *regs, int si_code)
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{
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report_user_fault(regs, SIGSEGV, 1);
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force_sig_fault(SIGSEGV, si_code, (void __user *)get_fault_address(regs));
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}
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static void handle_fault_error_nolock(struct pt_regs *regs, int si_code)
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{
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enum fault_type fault_type;
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unsigned long address;
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bool is_write;
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if (user_mode(regs)) {
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if (WARN_ON_ONCE(!si_code))
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si_code = SEGV_MAPERR;
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return do_sigsegv(regs, si_code);
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}
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if (fixup_exception(regs))
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return;
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fault_type = get_fault_type(regs);
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if (fault_type == KERNEL_FAULT) {
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address = get_fault_address(regs);
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is_write = fault_is_write(regs);
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if (kfence_handle_page_fault(address, is_write, regs))
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return;
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}
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if (fault_type == KERNEL_FAULT)
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pr_alert("Unable to handle kernel pointer dereference in virtual kernel address space\n");
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else
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pr_alert("Unable to handle kernel paging request in virtual user address space\n");
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dump_fault_info(regs);
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die(regs, "Oops");
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}
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static void handle_fault_error(struct pt_regs *regs, int si_code)
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{
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struct mm_struct *mm = current->mm;
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mmap_read_unlock(mm);
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handle_fault_error_nolock(regs, si_code);
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}
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static void do_sigbus(struct pt_regs *regs)
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{
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force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)get_fault_address(regs));
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}
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/*
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* This routine handles page faults. It determines the address,
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* and the problem, and then passes it off to one of the appropriate
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* routines.
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*
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* interruption code (int_code):
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* 04 Protection -> Write-Protection (suppression)
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* 10 Segment translation -> Not present (nullification)
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* 11 Page translation -> Not present (nullification)
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* 3b Region third trans. -> Not present (nullification)
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*/
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static void do_exception(struct pt_regs *regs, int access)
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{
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struct vm_area_struct *vma;
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unsigned long address;
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struct mm_struct *mm;
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enum fault_type type;
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unsigned int flags;
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struct gmap *gmap;
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vm_fault_t fault;
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bool is_write;
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/*
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* The instruction that caused the program check has
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* been nullified. Don't signal single step via SIGTRAP.
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*/
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clear_thread_flag(TIF_PER_TRAP);
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if (kprobe_page_fault(regs, 14))
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return;
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mm = current->mm;
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address = get_fault_address(regs);
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is_write = fault_is_write(regs);
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type = get_fault_type(regs);
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switch (type) {
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case KERNEL_FAULT:
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return handle_fault_error_nolock(regs, 0);
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case USER_FAULT:
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case GMAP_FAULT:
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if (faulthandler_disabled() || !mm)
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return handle_fault_error_nolock(regs, 0);
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break;
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}
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
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flags = FAULT_FLAG_DEFAULT;
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if (user_mode(regs))
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flags |= FAULT_FLAG_USER;
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if (is_write)
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access = VM_WRITE;
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if (access == VM_WRITE)
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flags |= FAULT_FLAG_WRITE;
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if (!(flags & FAULT_FLAG_USER))
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goto lock_mmap;
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vma = lock_vma_under_rcu(mm, address);
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if (!vma)
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goto lock_mmap;
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if (!(vma->vm_flags & access)) {
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vma_end_read(vma);
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goto lock_mmap;
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}
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fault = handle_mm_fault(vma, address, flags | FAULT_FLAG_VMA_LOCK, regs);
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if (!(fault & (VM_FAULT_RETRY | VM_FAULT_COMPLETED)))
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vma_end_read(vma);
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if (!(fault & VM_FAULT_RETRY)) {
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count_vm_vma_lock_event(VMA_LOCK_SUCCESS);
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if (unlikely(fault & VM_FAULT_ERROR))
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goto error;
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return;
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}
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count_vm_vma_lock_event(VMA_LOCK_RETRY);
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if (fault & VM_FAULT_MAJOR)
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flags |= FAULT_FLAG_TRIED;
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/* Quick path to respond to signals */
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if (fault_signal_pending(fault, regs)) {
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if (!user_mode(regs))
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handle_fault_error_nolock(regs, 0);
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return;
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}
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lock_mmap:
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mmap_read_lock(mm);
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gmap = NULL;
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if (IS_ENABLED(CONFIG_PGSTE) && type == GMAP_FAULT) {
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gmap = (struct gmap *)S390_lowcore.gmap;
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current->thread.gmap_addr = address;
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current->thread.gmap_write_flag = !!(flags & FAULT_FLAG_WRITE);
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current->thread.gmap_int_code = regs->int_code & 0xffff;
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address = __gmap_translate(gmap, address);
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if (address == -EFAULT)
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return handle_fault_error(regs, SEGV_MAPERR);
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if (gmap->pfault_enabled)
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flags |= FAULT_FLAG_RETRY_NOWAIT;
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}
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retry:
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vma = find_vma(mm, address);
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if (!vma)
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return handle_fault_error(regs, SEGV_MAPERR);
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if (unlikely(vma->vm_start > address)) {
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if (!(vma->vm_flags & VM_GROWSDOWN))
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return handle_fault_error(regs, SEGV_MAPERR);
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vma = expand_stack(mm, address);
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if (!vma)
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return handle_fault_error_nolock(regs, SEGV_MAPERR);
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}
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if (unlikely(!(vma->vm_flags & access)))
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return handle_fault_error(regs, SEGV_ACCERR);
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fault = handle_mm_fault(vma, address, flags, regs);
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if (fault_signal_pending(fault, regs)) {
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if (flags & FAULT_FLAG_RETRY_NOWAIT)
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mmap_read_unlock(mm);
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if (!user_mode(regs))
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handle_fault_error_nolock(regs, 0);
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return;
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}
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/* The fault is fully completed (including releasing mmap lock) */
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if (fault & VM_FAULT_COMPLETED) {
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if (gmap) {
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mmap_read_lock(mm);
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goto gmap;
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}
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return;
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}
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if (unlikely(fault & VM_FAULT_ERROR)) {
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mmap_read_unlock(mm);
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goto error;
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}
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if (fault & VM_FAULT_RETRY) {
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if (IS_ENABLED(CONFIG_PGSTE) && gmap && (flags & FAULT_FLAG_RETRY_NOWAIT)) {
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/*
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* FAULT_FLAG_RETRY_NOWAIT has been set,
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* mmap_lock has not been released
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*/
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current->thread.gmap_pfault = 1;
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return handle_fault_error(regs, 0);
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}
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flags &= ~FAULT_FLAG_RETRY_NOWAIT;
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flags |= FAULT_FLAG_TRIED;
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mmap_read_lock(mm);
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goto retry;
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}
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gmap:
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if (IS_ENABLED(CONFIG_PGSTE) && gmap) {
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address = __gmap_link(gmap, current->thread.gmap_addr,
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address);
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if (address == -EFAULT)
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return handle_fault_error(regs, SEGV_MAPERR);
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if (address == -ENOMEM) {
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fault = VM_FAULT_OOM;
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mmap_read_unlock(mm);
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goto error;
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}
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}
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mmap_read_unlock(mm);
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return;
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error:
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if (fault & VM_FAULT_OOM) {
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if (!user_mode(regs))
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handle_fault_error_nolock(regs, 0);
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else
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pagefault_out_of_memory();
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} else if (fault & VM_FAULT_SIGSEGV) {
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if (!user_mode(regs))
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handle_fault_error_nolock(regs, 0);
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else
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do_sigsegv(regs, SEGV_MAPERR);
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} else if (fault & VM_FAULT_SIGBUS) {
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if (!user_mode(regs))
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handle_fault_error_nolock(regs, 0);
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else
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do_sigbus(regs);
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} else {
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BUG();
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}
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}
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void do_protection_exception(struct pt_regs *regs)
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{
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union teid teid = { .val = regs->int_parm_long };
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/*
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* Protection exceptions are suppressing, decrement psw address.
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* The exception to this rule are aborted transactions, for these
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* the PSW already points to the correct location.
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*/
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if (!(regs->int_code & 0x200))
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regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16);
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/*
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* Check for low-address protection. This needs to be treated
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* as a special case because the translation exception code
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* field is not guaranteed to contain valid data in this case.
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*/
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if (unlikely(!teid.b61)) {
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if (user_mode(regs)) {
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/* Low-address protection in user mode: cannot happen */
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die(regs, "Low-address protection");
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}
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/*
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* Low-address protection in kernel mode means
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* NULL pointer write access in kernel mode.
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*/
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return handle_fault_error_nolock(regs, 0);
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}
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if (unlikely(MACHINE_HAS_NX && teid.b56)) {
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regs->int_parm_long = (teid.addr * PAGE_SIZE) | (regs->psw.addr & PAGE_MASK);
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return handle_fault_error_nolock(regs, SEGV_ACCERR);
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}
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do_exception(regs, VM_WRITE);
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}
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NOKPROBE_SYMBOL(do_protection_exception);
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void do_dat_exception(struct pt_regs *regs)
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{
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do_exception(regs, VM_ACCESS_FLAGS);
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}
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NOKPROBE_SYMBOL(do_dat_exception);
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#if IS_ENABLED(CONFIG_PGSTE)
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void do_secure_storage_access(struct pt_regs *regs)
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{
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union teid teid = { .val = regs->int_parm_long };
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unsigned long addr = get_fault_address(regs);
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struct vm_area_struct *vma;
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struct mm_struct *mm;
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struct page *page;
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struct gmap *gmap;
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int rc;
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/*
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* Bit 61 indicates if the address is valid, if it is not the
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* kernel should be stopped or SIGSEGV should be sent to the
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* process. Bit 61 is not reliable without the misc UV feature,
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* therefore this needs to be checked too.
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*/
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if (uv_has_feature(BIT_UV_FEAT_MISC) && !teid.b61) {
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/*
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* When this happens, userspace did something that it
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* was not supposed to do, e.g. branching into secure
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* memory. Trigger a segmentation fault.
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*/
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if (user_mode(regs)) {
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send_sig(SIGSEGV, current, 0);
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return;
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}
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/*
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* The kernel should never run into this case and
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* there is no way out of this situation.
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*/
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panic("Unexpected PGM 0x3d with TEID bit 61=0");
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}
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switch (get_fault_type(regs)) {
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case GMAP_FAULT:
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mm = current->mm;
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gmap = (struct gmap *)S390_lowcore.gmap;
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mmap_read_lock(mm);
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addr = __gmap_translate(gmap, addr);
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mmap_read_unlock(mm);
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if (IS_ERR_VALUE(addr))
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return handle_fault_error_nolock(regs, SEGV_MAPERR);
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fallthrough;
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case USER_FAULT:
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mm = current->mm;
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mmap_read_lock(mm);
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vma = find_vma(mm, addr);
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if (!vma)
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return handle_fault_error(regs, SEGV_MAPERR);
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page = follow_page(vma, addr, FOLL_WRITE | FOLL_GET);
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if (IS_ERR_OR_NULL(page)) {
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mmap_read_unlock(mm);
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break;
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}
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if (arch_make_page_accessible(page))
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send_sig(SIGSEGV, current, 0);
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put_page(page);
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mmap_read_unlock(mm);
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break;
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case KERNEL_FAULT:
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page = phys_to_page(addr);
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if (unlikely(!try_get_page(page)))
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break;
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rc = arch_make_page_accessible(page);
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put_page(page);
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if (rc)
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BUG();
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break;
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default:
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unreachable();
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}
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}
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NOKPROBE_SYMBOL(do_secure_storage_access);
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void do_non_secure_storage_access(struct pt_regs *regs)
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{
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struct gmap *gmap = (struct gmap *)S390_lowcore.gmap;
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unsigned long gaddr = get_fault_address(regs);
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if (WARN_ON_ONCE(get_fault_type(regs) != GMAP_FAULT))
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return handle_fault_error_nolock(regs, SEGV_MAPERR);
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if (gmap_convert_to_secure(gmap, gaddr) == -EINVAL)
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send_sig(SIGSEGV, current, 0);
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}
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NOKPROBE_SYMBOL(do_non_secure_storage_access);
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void do_secure_storage_violation(struct pt_regs *regs)
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{
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struct gmap *gmap = (struct gmap *)S390_lowcore.gmap;
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unsigned long gaddr = get_fault_address(regs);
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/*
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* If the VM has been rebooted, its address space might still contain
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* secure pages from the previous boot.
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* Clear the page so it can be reused.
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*/
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if (!gmap_destroy_page(gmap, gaddr))
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return;
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/*
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* Either KVM messed up the secure guest mapping or the same
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* page is mapped into multiple secure guests.
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*
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* This exception is only triggered when a guest 2 is running
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* and can therefore never occur in kernel context.
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*/
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pr_warn_ratelimited("Secure storage violation in task: %s, pid %d\n",
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current->comm, current->pid);
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send_sig(SIGSEGV, current, 0);
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}
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#endif /* CONFIG_PGSTE */
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