1d2127123d
According to the following in arch/arm/mm/fault.c page faults from
kernel mode are invalid if mmap_sem is already held and there is
no exception handler defined for the faulting instruction:
/*
* As per x86, we may deadlock here. However, since the kernel only
* validly references user space from well defined areas of the code,
* we can bug out early if this is from code which shouldn't.
*/
if (!down_read_trylock(&mm->mmap_sem)) {
if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc))
goto no_context;
Since mmap_sem can be held at arbitrary times by another thread this
also means that any page faults from kernel mode are invalid if no
exception handler is defined for them, regardless whether mmap_sem is
held at the time of fault.
To easier detect code that can trigger the above error, add a check
also for the case where mmap_sem is acquired. As this has an overhead
make it a VM debug check.
Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
582 lines
15 KiB
C
582 lines
15 KiB
C
/*
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* linux/arch/arm/mm/fault.c
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*
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* Copyright (C) 1995 Linus Torvalds
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* Modifications for ARM processor (c) 1995-2004 Russell King
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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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#include <linux/module.h>
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#include <linux/signal.h>
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#include <linux/mm.h>
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#include <linux/hardirq.h>
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#include <linux/init.h>
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#include <linux/kprobes.h>
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#include <linux/uaccess.h>
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#include <linux/page-flags.h>
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#include <linux/sched.h>
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#include <linux/highmem.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include "fault.h"
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/*
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* Fault status register encodings. We steal bit 31 for our own purposes.
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*/
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#define FSR_LNX_PF (1 << 31)
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#define FSR_WRITE (1 << 11)
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#define FSR_FS4 (1 << 10)
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#define FSR_FS3_0 (15)
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static inline int fsr_fs(unsigned int fsr)
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{
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return (fsr & FSR_FS3_0) | (fsr & FSR_FS4) >> 6;
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}
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#ifdef CONFIG_MMU
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#ifdef CONFIG_KPROBES
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static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr)
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{
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int ret = 0;
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if (!user_mode(regs)) {
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/* kprobe_running() needs smp_processor_id() */
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preempt_disable();
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if (kprobe_running() && kprobe_fault_handler(regs, fsr))
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ret = 1;
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preempt_enable();
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}
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return ret;
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}
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#else
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static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr)
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{
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return 0;
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}
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#endif
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/*
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* This is useful to dump out the page tables associated with
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* 'addr' in mm 'mm'.
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*/
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void show_pte(struct mm_struct *mm, unsigned long addr)
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{
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pgd_t *pgd;
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if (!mm)
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mm = &init_mm;
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printk(KERN_ALERT "pgd = %p\n", mm->pgd);
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pgd = pgd_offset(mm, addr);
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printk(KERN_ALERT "[%08lx] *pgd=%08lx", addr, pgd_val(*pgd));
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do {
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pmd_t *pmd;
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pte_t *pte;
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if (pgd_none(*pgd))
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break;
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if (pgd_bad(*pgd)) {
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printk("(bad)");
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break;
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}
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pmd = pmd_offset(pgd, addr);
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if (PTRS_PER_PMD != 1)
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printk(", *pmd=%08lx", pmd_val(*pmd));
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if (pmd_none(*pmd))
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break;
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if (pmd_bad(*pmd)) {
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printk("(bad)");
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break;
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}
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/* We must not map this if we have highmem enabled */
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if (PageHighMem(pfn_to_page(pmd_val(*pmd) >> PAGE_SHIFT)))
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break;
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pte = pte_offset_map(pmd, addr);
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printk(", *pte=%08lx", pte_val(*pte));
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printk(", *ppte=%08lx", pte_val(pte[-PTRS_PER_PTE]));
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pte_unmap(pte);
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} while(0);
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printk("\n");
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}
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#else /* CONFIG_MMU */
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void show_pte(struct mm_struct *mm, unsigned long addr)
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{ }
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#endif /* CONFIG_MMU */
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/*
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* Oops. The kernel tried to access some page that wasn't present.
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*/
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static void
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__do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
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struct pt_regs *regs)
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{
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/*
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* Are we prepared to handle this kernel fault?
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*/
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if (fixup_exception(regs))
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return;
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/*
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* No handler, we'll have to terminate things with extreme prejudice.
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*/
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bust_spinlocks(1);
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printk(KERN_ALERT
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"Unable to handle kernel %s at virtual address %08lx\n",
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(addr < PAGE_SIZE) ? "NULL pointer dereference" :
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"paging request", addr);
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show_pte(mm, addr);
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die("Oops", regs, fsr);
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bust_spinlocks(0);
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do_exit(SIGKILL);
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}
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/*
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* Something tried to access memory that isn't in our memory map..
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* User mode accesses just cause a SIGSEGV
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*/
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static void
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__do_user_fault(struct task_struct *tsk, unsigned long addr,
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unsigned int fsr, unsigned int sig, int code,
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struct pt_regs *regs)
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{
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struct siginfo si;
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#ifdef CONFIG_DEBUG_USER
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if (user_debug & UDBG_SEGV) {
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printk(KERN_DEBUG "%s: unhandled page fault (%d) at 0x%08lx, code 0x%03x\n",
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tsk->comm, sig, addr, fsr);
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show_pte(tsk->mm, addr);
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show_regs(regs);
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}
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#endif
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tsk->thread.address = addr;
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tsk->thread.error_code = fsr;
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tsk->thread.trap_no = 14;
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si.si_signo = sig;
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si.si_errno = 0;
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si.si_code = code;
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si.si_addr = (void __user *)addr;
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force_sig_info(sig, &si, tsk);
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}
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void do_bad_area(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
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{
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struct task_struct *tsk = current;
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struct mm_struct *mm = tsk->active_mm;
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/*
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* If we are in kernel mode at this point, we
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* have no context to handle this fault with.
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*/
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if (user_mode(regs))
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__do_user_fault(tsk, addr, fsr, SIGSEGV, SEGV_MAPERR, regs);
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else
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__do_kernel_fault(mm, addr, fsr, regs);
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}
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#ifdef CONFIG_MMU
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#define VM_FAULT_BADMAP 0x010000
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#define VM_FAULT_BADACCESS 0x020000
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/*
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* Check that the permissions on the VMA allow for the fault which occurred.
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* If we encountered a write fault, we must have write permission, otherwise
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* we allow any permission.
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*/
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static inline bool access_error(unsigned int fsr, struct vm_area_struct *vma)
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{
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unsigned int mask = VM_READ | VM_WRITE | VM_EXEC;
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if (fsr & FSR_WRITE)
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mask = VM_WRITE;
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if (fsr & FSR_LNX_PF)
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mask = VM_EXEC;
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return vma->vm_flags & mask ? false : true;
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}
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static int __kprobes
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__do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
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struct task_struct *tsk)
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{
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struct vm_area_struct *vma;
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int fault;
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vma = find_vma(mm, addr);
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fault = VM_FAULT_BADMAP;
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if (unlikely(!vma))
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goto out;
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if (unlikely(vma->vm_start > addr))
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goto check_stack;
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/*
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* Ok, we have a good vm_area for this
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* memory access, so we can handle it.
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*/
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good_area:
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if (access_error(fsr, vma)) {
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fault = VM_FAULT_BADACCESS;
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goto out;
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}
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/*
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* If for any reason at all we couldn't handle the fault, make
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* sure we exit gracefully rather than endlessly redo the fault.
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*/
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fault = handle_mm_fault(mm, vma, addr & PAGE_MASK, (fsr & FSR_WRITE) ? FAULT_FLAG_WRITE : 0);
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if (unlikely(fault & VM_FAULT_ERROR))
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return fault;
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if (fault & VM_FAULT_MAJOR)
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tsk->maj_flt++;
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else
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tsk->min_flt++;
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return fault;
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check_stack:
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if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr))
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goto good_area;
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out:
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return fault;
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}
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static int __kprobes
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do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
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{
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struct task_struct *tsk;
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struct mm_struct *mm;
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int fault, sig, code;
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if (notify_page_fault(regs, fsr))
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return 0;
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tsk = current;
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mm = tsk->mm;
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/*
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* If we're in an interrupt or have no user
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* context, we must not take the fault..
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*/
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if (in_atomic() || !mm)
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goto no_context;
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/*
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* As per x86, we may deadlock here. However, since the kernel only
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* validly references user space from well defined areas of the code,
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* we can bug out early if this is from code which shouldn't.
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*/
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if (!down_read_trylock(&mm->mmap_sem)) {
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if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc))
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goto no_context;
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down_read(&mm->mmap_sem);
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} else {
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/*
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* The above down_read_trylock() might have succeeded in
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* which case, we'll have missed the might_sleep() from
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* down_read()
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*/
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might_sleep();
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#ifdef CONFIG_DEBUG_VM
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if (!user_mode(regs) &&
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!search_exception_tables(regs->ARM_pc))
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goto no_context;
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#endif
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}
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fault = __do_page_fault(mm, addr, fsr, tsk);
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up_read(&mm->mmap_sem);
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/*
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* Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR
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*/
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if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS))))
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return 0;
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if (fault & VM_FAULT_OOM) {
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/*
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* We ran out of memory, call the OOM killer, and return to
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* userspace (which will retry the fault, or kill us if we
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* got oom-killed)
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*/
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pagefault_out_of_memory();
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return 0;
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}
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/*
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* If we are in kernel mode at this point, we
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* have no context to handle this fault with.
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*/
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if (!user_mode(regs))
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goto no_context;
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if (fault & VM_FAULT_SIGBUS) {
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/*
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* We had some memory, but were unable to
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* successfully fix up this page fault.
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*/
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sig = SIGBUS;
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code = BUS_ADRERR;
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} else {
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/*
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* Something tried to access memory that
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* isn't in our memory map..
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*/
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sig = SIGSEGV;
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code = fault == VM_FAULT_BADACCESS ?
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SEGV_ACCERR : SEGV_MAPERR;
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}
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__do_user_fault(tsk, addr, fsr, sig, code, regs);
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return 0;
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no_context:
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__do_kernel_fault(mm, addr, fsr, regs);
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return 0;
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}
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#else /* CONFIG_MMU */
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static int
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do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
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{
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return 0;
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}
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#endif /* CONFIG_MMU */
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/*
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* First Level Translation Fault Handler
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*
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* We enter here because the first level page table doesn't contain
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* a valid entry for the address.
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*
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* If the address is in kernel space (>= TASK_SIZE), then we are
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* probably faulting in the vmalloc() area.
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*
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* If the init_task's first level page tables contains the relevant
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* entry, we copy the it to this task. If not, we send the process
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* a signal, fixup the exception, or oops the kernel.
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*
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* NOTE! We MUST NOT take any locks for this case. We may be in an
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* interrupt or a critical region, and should only copy the information
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* from the master page table, nothing more.
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*/
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#ifdef CONFIG_MMU
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static int __kprobes
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do_translation_fault(unsigned long addr, unsigned int fsr,
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struct pt_regs *regs)
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{
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unsigned int index;
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pgd_t *pgd, *pgd_k;
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pmd_t *pmd, *pmd_k;
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if (addr < TASK_SIZE)
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return do_page_fault(addr, fsr, regs);
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index = pgd_index(addr);
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/*
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* FIXME: CP15 C1 is write only on ARMv3 architectures.
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*/
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pgd = cpu_get_pgd() + index;
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pgd_k = init_mm.pgd + index;
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if (pgd_none(*pgd_k))
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goto bad_area;
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if (!pgd_present(*pgd))
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set_pgd(pgd, *pgd_k);
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pmd_k = pmd_offset(pgd_k, addr);
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pmd = pmd_offset(pgd, addr);
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if (pmd_none(*pmd_k))
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goto bad_area;
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copy_pmd(pmd, pmd_k);
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return 0;
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bad_area:
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do_bad_area(addr, fsr, regs);
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return 0;
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}
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#else /* CONFIG_MMU */
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static int
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do_translation_fault(unsigned long addr, unsigned int fsr,
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struct pt_regs *regs)
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{
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return 0;
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}
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#endif /* CONFIG_MMU */
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/*
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* Some section permission faults need to be handled gracefully.
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* They can happen due to a __{get,put}_user during an oops.
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*/
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static int
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do_sect_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
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{
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do_bad_area(addr, fsr, regs);
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return 0;
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}
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/*
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* This abort handler always returns "fault".
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*/
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static int
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do_bad(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
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{
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return 1;
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}
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static struct fsr_info {
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int (*fn)(unsigned long addr, unsigned int fsr, struct pt_regs *regs);
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int sig;
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int code;
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const char *name;
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} fsr_info[] = {
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/*
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* The following are the standard ARMv3 and ARMv4 aborts. ARMv5
|
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* defines these to be "precise" aborts.
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*/
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{ do_bad, SIGSEGV, 0, "vector exception" },
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{ do_bad, SIGILL, BUS_ADRALN, "alignment exception" },
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{ do_bad, SIGKILL, 0, "terminal exception" },
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{ do_bad, SIGILL, BUS_ADRALN, "alignment exception" },
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{ do_bad, SIGBUS, 0, "external abort on linefetch" },
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{ do_translation_fault, SIGSEGV, SEGV_MAPERR, "section translation fault" },
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{ do_bad, SIGBUS, 0, "external abort on linefetch" },
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{ do_page_fault, SIGSEGV, SEGV_MAPERR, "page translation fault" },
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{ do_bad, SIGBUS, 0, "external abort on non-linefetch" },
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{ do_bad, SIGSEGV, SEGV_ACCERR, "section domain fault" },
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{ do_bad, SIGBUS, 0, "external abort on non-linefetch" },
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{ do_bad, SIGSEGV, SEGV_ACCERR, "page domain fault" },
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{ do_bad, SIGBUS, 0, "external abort on translation" },
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{ do_sect_fault, SIGSEGV, SEGV_ACCERR, "section permission fault" },
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{ do_bad, SIGBUS, 0, "external abort on translation" },
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{ do_page_fault, SIGSEGV, SEGV_ACCERR, "page permission fault" },
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/*
|
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* The following are "imprecise" aborts, which are signalled by bit
|
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* 10 of the FSR, and may not be recoverable. These are only
|
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* supported if the CPU abort handler supports bit 10.
|
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*/
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{ do_bad, SIGBUS, 0, "unknown 16" },
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{ do_bad, SIGBUS, 0, "unknown 17" },
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{ do_bad, SIGBUS, 0, "unknown 18" },
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{ do_bad, SIGBUS, 0, "unknown 19" },
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{ do_bad, SIGBUS, 0, "lock abort" }, /* xscale */
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{ do_bad, SIGBUS, 0, "unknown 21" },
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{ do_bad, SIGBUS, BUS_OBJERR, "imprecise external abort" }, /* xscale */
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{ do_bad, SIGBUS, 0, "unknown 23" },
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{ do_bad, SIGBUS, 0, "dcache parity error" }, /* xscale */
|
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{ do_bad, SIGBUS, 0, "unknown 25" },
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{ do_bad, SIGBUS, 0, "unknown 26" },
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{ do_bad, SIGBUS, 0, "unknown 27" },
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{ do_bad, SIGBUS, 0, "unknown 28" },
|
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{ do_bad, SIGBUS, 0, "unknown 29" },
|
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{ do_bad, SIGBUS, 0, "unknown 30" },
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{ do_bad, SIGBUS, 0, "unknown 31" }
|
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};
|
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|
|
void __init
|
|
hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *),
|
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int sig, const char *name)
|
|
{
|
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if (nr >= 0 && nr < ARRAY_SIZE(fsr_info)) {
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fsr_info[nr].fn = fn;
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fsr_info[nr].sig = sig;
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fsr_info[nr].name = name;
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}
|
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}
|
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|
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/*
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* Dispatch a data abort to the relevant handler.
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*/
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asmlinkage void __exception
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do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
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{
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const struct fsr_info *inf = fsr_info + fsr_fs(fsr);
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struct siginfo info;
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if (!inf->fn(addr, fsr & ~FSR_LNX_PF, regs))
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return;
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printk(KERN_ALERT "Unhandled fault: %s (0x%03x) at 0x%08lx\n",
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inf->name, fsr, addr);
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info.si_signo = inf->sig;
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info.si_errno = 0;
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info.si_code = inf->code;
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info.si_addr = (void __user *)addr;
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arm_notify_die("", regs, &info, fsr, 0);
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}
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static struct fsr_info ifsr_info[] = {
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{ do_bad, SIGBUS, 0, "unknown 0" },
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{ do_bad, SIGBUS, 0, "unknown 1" },
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{ do_bad, SIGBUS, 0, "debug event" },
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{ do_bad, SIGSEGV, SEGV_ACCERR, "section access flag fault" },
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{ do_bad, SIGBUS, 0, "unknown 4" },
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{ do_translation_fault, SIGSEGV, SEGV_MAPERR, "section translation fault" },
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{ do_bad, SIGSEGV, SEGV_ACCERR, "page access flag fault" },
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{ do_page_fault, SIGSEGV, SEGV_MAPERR, "page translation fault" },
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{ do_bad, SIGBUS, 0, "external abort on non-linefetch" },
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{ do_bad, SIGSEGV, SEGV_ACCERR, "section domain fault" },
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{ do_bad, SIGBUS, 0, "unknown 10" },
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{ do_bad, SIGSEGV, SEGV_ACCERR, "page domain fault" },
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{ do_bad, SIGBUS, 0, "external abort on translation" },
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{ do_sect_fault, SIGSEGV, SEGV_ACCERR, "section permission fault" },
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{ do_bad, SIGBUS, 0, "external abort on translation" },
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{ do_page_fault, SIGSEGV, SEGV_ACCERR, "page permission fault" },
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{ do_bad, SIGBUS, 0, "unknown 16" },
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{ do_bad, SIGBUS, 0, "unknown 17" },
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{ do_bad, SIGBUS, 0, "unknown 18" },
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{ do_bad, SIGBUS, 0, "unknown 19" },
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{ do_bad, SIGBUS, 0, "unknown 20" },
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{ do_bad, SIGBUS, 0, "unknown 21" },
|
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{ do_bad, SIGBUS, 0, "unknown 22" },
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{ do_bad, SIGBUS, 0, "unknown 23" },
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{ do_bad, SIGBUS, 0, "unknown 24" },
|
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{ do_bad, SIGBUS, 0, "unknown 25" },
|
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{ do_bad, SIGBUS, 0, "unknown 26" },
|
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{ do_bad, SIGBUS, 0, "unknown 27" },
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{ do_bad, SIGBUS, 0, "unknown 28" },
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{ do_bad, SIGBUS, 0, "unknown 29" },
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{ do_bad, SIGBUS, 0, "unknown 30" },
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{ do_bad, SIGBUS, 0, "unknown 31" },
|
|
};
|
|
|
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asmlinkage void __exception
|
|
do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
|
|
{
|
|
const struct fsr_info *inf = ifsr_info + fsr_fs(ifsr);
|
|
struct siginfo info;
|
|
|
|
if (!inf->fn(addr, ifsr | FSR_LNX_PF, regs))
|
|
return;
|
|
|
|
printk(KERN_ALERT "Unhandled prefetch abort: %s (0x%03x) at 0x%08lx\n",
|
|
inf->name, ifsr, addr);
|
|
|
|
info.si_signo = inf->sig;
|
|
info.si_errno = 0;
|
|
info.si_code = inf->code;
|
|
info.si_addr = (void __user *)addr;
|
|
arm_notify_die("", regs, &info, ifsr, 0);
|
|
}
|
|
|