#include #include #include #include typedef bool (*ex_handler_t)(const struct exception_table_entry *, struct pt_regs *, int); static inline unsigned long ex_fixup_addr(const struct exception_table_entry *x) { return (unsigned long)&x->fixup + x->fixup; } static inline ex_handler_t ex_fixup_handler(const struct exception_table_entry *x) { return (ex_handler_t)((unsigned long)&x->handler + x->handler); } bool ex_handler_default(const struct exception_table_entry *fixup, struct pt_regs *regs, int trapnr) { regs->ip = ex_fixup_addr(fixup); return true; } EXPORT_SYMBOL(ex_handler_default); bool ex_handler_fault(const struct exception_table_entry *fixup, struct pt_regs *regs, int trapnr) { regs->ip = ex_fixup_addr(fixup); regs->ax = trapnr; return true; } EXPORT_SYMBOL_GPL(ex_handler_fault); /* * Handler for UD0 exception following a failed test against the * result of a refcount inc/dec/add/sub. */ bool ex_handler_refcount(const struct exception_table_entry *fixup, struct pt_regs *regs, int trapnr) { /* First unconditionally saturate the refcount. */ *(int *)regs->cx = INT_MIN / 2; /* * Strictly speaking, this reports the fixup destination, not * the fault location, and not the actually overflowing * instruction, which is the instruction before the "js", but * since that instruction could be a variety of lengths, just * report the location after the overflow, which should be close * enough for finding the overflow, as it's at least back in * the function, having returned from .text.unlikely. */ regs->ip = ex_fixup_addr(fixup); /* * This function has been called because either a negative refcount * value was seen by any of the refcount functions, or a zero * refcount value was seen by refcount_dec(). * * If we crossed from INT_MAX to INT_MIN, OF (Overflow Flag: result * wrapped around) will be set. Additionally, seeing the refcount * reach 0 will set ZF (Zero Flag: result was zero). In each of * these cases we want a report, since it's a boundary condition. * */ if (regs->flags & (X86_EFLAGS_OF | X86_EFLAGS_ZF)) { bool zero = regs->flags & X86_EFLAGS_ZF; refcount_error_report(regs, zero ? "hit zero" : "overflow"); } return true; } EXPORT_SYMBOL_GPL(ex_handler_refcount); bool ex_handler_ext(const struct exception_table_entry *fixup, struct pt_regs *regs, int trapnr) { /* Special hack for uaccess_err */ current->thread.uaccess_err = 1; regs->ip = ex_fixup_addr(fixup); return true; } EXPORT_SYMBOL(ex_handler_ext); bool ex_handler_rdmsr_unsafe(const struct exception_table_entry *fixup, struct pt_regs *regs, int trapnr) { if (pr_warn_once("unchecked MSR access error: RDMSR from 0x%x at rIP: 0x%lx (%pF)\n", (unsigned int)regs->cx, regs->ip, (void *)regs->ip)) show_stack_regs(regs); /* Pretend that the read succeeded and returned 0. */ regs->ip = ex_fixup_addr(fixup); regs->ax = 0; regs->dx = 0; return true; } EXPORT_SYMBOL(ex_handler_rdmsr_unsafe); bool ex_handler_wrmsr_unsafe(const struct exception_table_entry *fixup, struct pt_regs *regs, int trapnr) { if (pr_warn_once("unchecked MSR access error: WRMSR to 0x%x (tried to write 0x%08x%08x) at rIP: 0x%lx (%pF)\n", (unsigned int)regs->cx, (unsigned int)regs->dx, (unsigned int)regs->ax, regs->ip, (void *)regs->ip)) show_stack_regs(regs); /* Pretend that the write succeeded. */ regs->ip = ex_fixup_addr(fixup); return true; } EXPORT_SYMBOL(ex_handler_wrmsr_unsafe); bool ex_handler_clear_fs(const struct exception_table_entry *fixup, struct pt_regs *regs, int trapnr) { if (static_cpu_has(X86_BUG_NULL_SEG)) asm volatile ("mov %0, %%fs" : : "rm" (__USER_DS)); asm volatile ("mov %0, %%fs" : : "rm" (0)); return ex_handler_default(fixup, regs, trapnr); } EXPORT_SYMBOL(ex_handler_clear_fs); bool ex_has_fault_handler(unsigned long ip) { const struct exception_table_entry *e; ex_handler_t handler; e = search_exception_tables(ip); if (!e) return false; handler = ex_fixup_handler(e); return handler == ex_handler_fault; } int fixup_exception(struct pt_regs *regs, int trapnr) { const struct exception_table_entry *e; ex_handler_t handler; #ifdef CONFIG_PNPBIOS if (unlikely(SEGMENT_IS_PNP_CODE(regs->cs))) { extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp; extern u32 pnp_bios_is_utter_crap; pnp_bios_is_utter_crap = 1; printk(KERN_CRIT "PNPBIOS fault.. attempting recovery.\n"); __asm__ volatile( "movl %0, %%esp\n\t" "jmp *%1\n\t" : : "g" (pnp_bios_fault_esp), "g" (pnp_bios_fault_eip)); panic("do_trap: can't hit this"); } #endif e = search_exception_tables(regs->ip); if (!e) return 0; handler = ex_fixup_handler(e); return handler(e, regs, trapnr); } extern unsigned int early_recursion_flag; /* Restricted version used during very early boot */ void __init early_fixup_exception(struct pt_regs *regs, int trapnr) { /* Ignore early NMIs. */ if (trapnr == X86_TRAP_NMI) return; if (early_recursion_flag > 2) goto halt_loop; /* * Old CPUs leave the high bits of CS on the stack * undefined. I'm not sure which CPUs do this, but at least * the 486 DX works this way. */ if ((regs->cs & 0xFFFF) != __KERNEL_CS) goto fail; /* * The full exception fixup machinery is available as soon as * the early IDT is loaded. This means that it is the * responsibility of extable users to either function correctly * when handlers are invoked early or to simply avoid causing * exceptions before they're ready to handle them. * * This is better than filtering which handlers can be used, * because refusing to call a handler here is guaranteed to * result in a hard-to-debug panic. * * Keep in mind that not all vectors actually get here. Early * fage faults, for example, are special. */ if (fixup_exception(regs, trapnr)) return; fail: early_printk("PANIC: early exception 0x%02x IP %lx:%lx error %lx cr2 0x%lx\n", (unsigned)trapnr, (unsigned long)regs->cs, regs->ip, regs->orig_ax, read_cr2()); show_regs(regs); halt_loop: while (true) halt(); }