diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h index 118a0f54757f..5667a674bc2c 100644 --- a/arch/arm64/include/asm/system_misc.h +++ b/arch/arm64/include/asm/system_misc.h @@ -40,7 +40,7 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int, int sig, int code, const char *name); struct mm_struct; -extern void show_pte(struct mm_struct *mm, unsigned long addr); +extern void show_pte(unsigned long addr); #ifdef CONFIG_AMLOGIC_USER_FAULT extern void show_all_pfn(struct task_struct *task, struct pt_regs *regs); extern void show_vma(struct mm_struct *mm, unsigned long addr); diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index b6caa4f669ab..872369b8c212 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -79,18 +79,33 @@ static inline int notify_page_fault(struct pt_regs *regs, unsigned int esr) #endif /* - * Dump out the page tables associated with 'addr' in mm 'mm'. + * Dump out the page tables associated with 'addr' in the currently active mm. */ -void show_pte(struct mm_struct *mm, unsigned long addr) +void show_pte(unsigned long addr) { + struct mm_struct *mm; pgd_t *pgd; - if (!mm) + if (addr < TASK_SIZE) { + /* TTBR0 */ + mm = current->active_mm; + if (mm == &init_mm) { + pr_alert("[%016lx] user address but active_mm is swapper\n", + addr); + return; + } + } else if (addr >= VA_START) { + /* TTBR1 */ mm = &init_mm; + } else { + pr_alert("[%016lx] address between user and kernel address ranges\n", + addr); + return; + } pr_alert("pgd = %p\n", mm->pgd); pgd = pgd_offset(mm, addr); - pr_alert("[%08lx] *pgd=%016llx", addr, pgd_val(*pgd)); + pr_alert("[%016lx] *pgd=%016llx", addr, pgd_val(*pgd)); do { pud_t *pud; @@ -213,8 +228,8 @@ static bool is_el1_instruction_abort(unsigned int esr) /* * The kernel tried to access some page that wasn't present. */ -static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr, - unsigned int esr, struct pt_regs *regs) +static void __do_kernel_fault(unsigned long addr, unsigned int esr, + struct pt_regs *regs) { /* * Are we prepared to handle this kernel fault? @@ -231,7 +246,7 @@ static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr, (addr < PAGE_SIZE) ? "NULL pointer dereference" : "paging request", addr); - show_pte(mm, addr); + show_pte(addr); die("Oops", regs, esr); bust_spinlocks(0); do_exit(SIGKILL); @@ -301,7 +316,7 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr, pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n", tsk->comm, task_pid_nr(tsk), inf->name, sig, addr, esr); - show_pte(tsk->mm, addr); + show_pte(addr); #ifdef CONFIG_AMLOGIC_USER_FAULT show_all_pfn(tsk, regs); #endif /* CONFIG_AMLOGIC_USER_FAULT */ @@ -320,7 +335,6 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr, static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *regs) { struct task_struct *tsk = current; - struct mm_struct *mm = tsk->active_mm; const struct fault_info *inf; /* @@ -331,7 +345,7 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re inf = esr_to_fault_info(esr); __do_user_fault(tsk, addr, esr, inf->sig, inf->code, regs); } else - __do_kernel_fault(mm, addr, esr, regs); + __do_kernel_fault(addr, esr, regs); } #define VM_FAULT_BADMAP 0x010000 @@ -548,7 +562,7 @@ retry: return 0; no_context: - __do_kernel_fault(mm, addr, esr, regs); + __do_kernel_fault(addr, esr, regs); return 0; }