diff options
Diffstat (limited to 'arch/i386/mm/fault.c')
| -rw-r--r-- | arch/i386/mm/fault.c | 33 |
1 files changed, 21 insertions, 12 deletions
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c index 1ecb3e43b52..01ffdd4964f 100644 --- a/arch/i386/mm/fault.c +++ b/arch/i386/mm/fault.c @@ -283,6 +283,8 @@ static inline int vmalloc_fault(unsigned long address) return 0; } +int show_unhandled_signals = 1; + /* * This routine handles page faults. It determines the address, * and the problem, and then passes it off to one of the appropriate @@ -303,6 +305,7 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs, struct vm_area_struct * vma; unsigned long address; int write, si_code; + int fault; /* get the address */ address = read_cr2(); @@ -422,20 +425,18 @@ good_area: * make sure we exit gracefully rather than endlessly redo * the fault. */ - switch (handle_mm_fault(mm, vma, address, write)) { - case VM_FAULT_MINOR: - tsk->min_flt++; - break; - case VM_FAULT_MAJOR: - tsk->maj_flt++; - break; - case VM_FAULT_SIGBUS: - goto do_sigbus; - case VM_FAULT_OOM: + fault = handle_mm_fault(mm, vma, address, write); + if (unlikely(fault & VM_FAULT_ERROR)) { + if (fault & VM_FAULT_OOM) goto out_of_memory; - default: - BUG(); + else if (fault & VM_FAULT_SIGBUS) + goto do_sigbus; + BUG(); } + if (fault & VM_FAULT_MAJOR) + tsk->maj_flt++; + else + tsk->min_flt++; /* * Did it hit the DOS screen memory VA from vm86 mode? @@ -470,6 +471,14 @@ bad_area_nosemaphore: if (is_prefetch(regs, address, error_code)) return; + if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && + printk_ratelimit()) { + printk("%s%s[%d]: segfault at %08lx eip %08lx " + "esp %08lx error %lx\n", + tsk->pid > 1 ? KERN_INFO : KERN_EMERG, + tsk->comm, tsk->pid, address, regs->eip, + regs->esp, error_code); + } tsk->thread.cr2 = address; /* Kernel addresses are always protection faults */ tsk->thread.error_code = error_code | (address >= TASK_SIZE); |