taint: add explicit flag to show whether lock dep is still OK.
Fix up all callers as they were before, with make one change: an unsigned module taints the kernel, but doesn't turn off lockdep. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
parent
64748a2c90
commit
373d4d0997
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@ -186,7 +186,7 @@ die_if_kernel(char * str, struct pt_regs *regs, long err, unsigned long *r9_15)
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#endif
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printk("%s(%d): %s %ld\n", current->comm, task_pid_nr(current), str, err);
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dik_show_regs(regs, r9_15);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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dik_show_trace((unsigned long *)(regs+1));
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dik_show_code((unsigned int *)regs->pc);
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@ -296,7 +296,7 @@ static void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
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bust_spinlocks(0);
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die_owner = -1;
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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die_nest_count--;
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if (!die_nest_count)
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/* Nest count reaches zero, release the lock. */
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@ -242,7 +242,7 @@ void die(const char *str, struct pt_regs *regs, int err)
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crash_kexec(regs);
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bust_spinlocks(0);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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raw_spin_unlock_irq(&die_lock);
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oops_exit();
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@ -61,7 +61,7 @@ void die(const char *str, struct pt_regs *regs, long err)
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show_regs_log_lvl(regs, KERN_EMERG);
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show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG);
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bust_spinlocks(0);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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spin_unlock_irq(&die_lock);
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if (in_interrupt())
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@ -225,7 +225,7 @@ int die(const char *str, struct pt_regs *regs, long err)
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do_show_stack(current, ®s->r30, pt_elr(regs));
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bust_spinlocks(0);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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spin_unlock_irq(&die.lock);
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@ -72,7 +72,7 @@ die (const char *str, struct pt_regs *regs, long err)
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bust_spinlocks(0);
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die.lock_owner = -1;
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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spin_unlock_irq(&die.lock);
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if (!regs)
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@ -1176,7 +1176,7 @@ void die_if_kernel (char *str, struct pt_regs *fp, int nr)
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console_verbose();
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printk("%s: %08x\n",str,nr);
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show_registers(fp);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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do_exit(SIGSEGV);
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}
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@ -396,7 +396,7 @@ void __noreturn die(const char *str, struct pt_regs *regs)
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printk("%s[#%d]:\n", str, ++die_counter);
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show_registers(regs);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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raw_spin_unlock_irq(&die_lock);
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oops_exit();
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@ -282,7 +282,7 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
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show_regs(regs);
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dump_stack();
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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if (in_interrupt())
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panic("Fatal exception in interrupt");
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@ -138,7 +138,7 @@ static void __kprobes oops_end(unsigned long flags, struct pt_regs *regs,
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{
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bust_spinlocks(0);
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die_owner = -1;
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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die_nest_count--;
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oops_exit();
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printk("\n");
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@ -271,7 +271,7 @@ void die(struct pt_regs *regs, const char *str)
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print_modules();
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show_regs(regs);
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bust_spinlocks(0);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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spin_unlock_irq(&die_lock);
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if (in_interrupt())
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panic("Fatal exception in interrupt");
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@ -38,7 +38,7 @@ void die(const char *str, struct pt_regs *regs, long err)
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notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV);
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bust_spinlocks(0);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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spin_unlock_irq(&die_lock);
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oops_exit();
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@ -115,7 +115,7 @@ static void __init process_switch(char c)
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break;
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}
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cheetah_pcache_forced_on = 1;
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add_taint(TAINT_MACHINE_CHECK);
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add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
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cheetah_enable_pcache();
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break;
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@ -58,7 +58,7 @@ void die_if_kernel(char *str, struct pt_regs *regs)
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printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
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show_regs(regs);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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__SAVE; __SAVE; __SAVE; __SAVE;
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__SAVE; __SAVE; __SAVE; __SAVE;
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@ -2383,7 +2383,7 @@ void die_if_kernel(char *str, struct pt_regs *regs)
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notify_die(DIE_OOPS, str, regs, 0, 255, SIGSEGV);
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__asm__ __volatile__("flushw");
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show_regs(regs);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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if (regs->tstate & TSTATE_PRIV) {
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struct thread_info *tp = current_thread_info();
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struct reg_window *rw = (struct reg_window *)
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@ -231,7 +231,7 @@ void die(const char *str, struct pt_regs *regs, int err)
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ret = __die(str, err, thread, regs);
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bust_spinlocks(0);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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spin_unlock_irq(&die_lock);
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oops_exit();
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@ -220,8 +220,7 @@ static void __cpuinit amd_k7_smp_check(struct cpuinfo_x86 *c)
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*/
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WARN_ONCE(1, "WARNING: This combination of AMD"
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" processors is not suitable for SMP.\n");
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if (!test_taint(TAINT_UNSAFE_SMP))
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add_taint(TAINT_UNSAFE_SMP);
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add_taint(TAINT_UNSAFE_SMP, LOCKDEP_NOW_UNRELIABLE);
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valid_k7:
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;
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@ -1085,7 +1085,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
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/*
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* Set taint even when machine check was not enabled.
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*/
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add_taint(TAINT_MACHINE_CHECK);
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add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
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severity = mce_severity(&m, cfg->tolerant, NULL);
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@ -33,7 +33,7 @@ static void pentium_machine_check(struct pt_regs *regs, long error_code)
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smp_processor_id());
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}
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add_taint(TAINT_MACHINE_CHECK);
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add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
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}
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/* Set up machine check reporting for processors with Intel style MCE: */
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@ -15,7 +15,7 @@
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static void winchip_machine_check(struct pt_regs *regs, long error_code)
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{
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printk(KERN_EMERG "CPU0: Machine Check Exception.\n");
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add_taint(TAINT_MACHINE_CHECK);
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add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
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}
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/* Set up machine check reporting on the Winchip C6 series */
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@ -542,7 +542,7 @@ static void generic_get_mtrr(unsigned int reg, unsigned long *base,
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if (tmp != mask_lo) {
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printk(KERN_WARNING "mtrr: your BIOS has configured an incorrect mask, fixing it.\n");
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add_taint(TAINT_FIRMWARE_WORKAROUND);
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add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
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mask_lo = tmp;
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}
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}
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@ -232,7 +232,7 @@ void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
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bust_spinlocks(0);
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die_owner = -1;
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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die_nest_count--;
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if (!die_nest_count)
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/* Nest count reaches zero, release the lock. */
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@ -524,7 +524,7 @@ void die(const char * str, struct pt_regs * regs, long err)
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if (!user_mode(regs))
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show_stack(NULL, (unsigned long*)regs->areg[1]);
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add_taint(TAINT_DIE);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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spin_unlock_irq(&die_lock);
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if (in_interrupt())
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@ -66,7 +66,7 @@ static ssize_t cm_write(struct file *file, const char __user * user_buf,
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buf = NULL;
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if (ACPI_FAILURE(status))
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return -EINVAL;
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add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
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add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
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}
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return count;
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@ -661,7 +661,7 @@ static void acpi_table_taint(struct acpi_table_header *table)
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pr_warn(PREFIX
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"Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
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table->signature, table->oem_table_id);
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add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
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add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
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}
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@ -267,7 +267,7 @@ static ssize_t regmap_map_write_file(struct file *file,
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return -EINVAL;
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/* Userspace has been fiddling around behind the kernel's back */
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add_taint(TAINT_USER);
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add_taint(TAINT_USER, LOCKDEP_NOW_UNRELIABLE);
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regmap_write(map, reg, value);
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return buf_size;
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@ -398,7 +398,11 @@ extern int panic_on_unrecovered_nmi;
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extern int panic_on_io_nmi;
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extern int sysctl_panic_on_stackoverflow;
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extern const char *print_tainted(void);
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extern void add_taint(unsigned flag);
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enum lockdep_ok {
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LOCKDEP_STILL_OK,
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LOCKDEP_NOW_UNRELIABLE
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};
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extern void add_taint(unsigned flag, enum lockdep_ok);
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extern int test_taint(unsigned flag);
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extern unsigned long get_taint(void);
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extern int root_mountflags;
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@ -197,9 +197,10 @@ static inline int strong_try_module_get(struct module *mod)
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return -ENOENT;
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}
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static inline void add_taint_module(struct module *mod, unsigned flag)
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static inline void add_taint_module(struct module *mod, unsigned flag,
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enum lockdep_ok lockdep_ok)
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{
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add_taint(flag);
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add_taint(flag, lockdep_ok);
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mod->taints |= (1U << flag);
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}
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{
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int ret = (flags & O_TRUNC);
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if (ret)
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add_taint(TAINT_FORCED_RMMOD);
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add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE);
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return ret;
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}
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#else
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@ -1138,7 +1139,7 @@ static int try_to_force_load(struct module *mod, const char *reason)
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if (!test_taint(TAINT_FORCED_MODULE))
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printk(KERN_WARNING "%s: %s: kernel tainted.\n",
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mod->name, reason);
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add_taint_module(mod, TAINT_FORCED_MODULE);
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add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE);
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return 0;
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#else
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return -ENOEXEC;
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if (!test_taint(TAINT_PROPRIETARY_MODULE))
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printk(KERN_WARNING "%s: module license '%s' taints "
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"kernel.\n", mod->name, license);
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add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
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add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
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LOCKDEP_NOW_UNRELIABLE);
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}
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}
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}
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if (!get_modinfo(info, "intree"))
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add_taint_module(mod, TAINT_OOT_MODULE);
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add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK);
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if (get_modinfo(info, "staging")) {
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add_taint_module(mod, TAINT_CRAP);
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add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK);
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printk(KERN_WARNING "%s: module is from the staging directory,"
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" the quality is unknown, you have been warned.\n",
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mod->name);
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* using GPL-only symbols it needs.
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*/
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if (strcmp(mod->name, "ndiswrapper") == 0)
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add_taint(TAINT_PROPRIETARY_MODULE);
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add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE);
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/* driverloader was caught wrongly pretending to be under GPL */
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if (strcmp(mod->name, "driverloader") == 0)
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add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
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add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
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LOCKDEP_NOW_UNRELIABLE);
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/* lve claims to be GPL but upstream won't provide source */
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if (strcmp(mod->name, "lve") == 0)
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add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
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add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
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LOCKDEP_NOW_UNRELIABLE);
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#ifdef CONFIG_MODVERSIONS
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if ((mod->num_syms && !mod->crcs)
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"%s: module verification failed: signature and/or"
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" required key missing - tainting kernel\n",
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mod->name);
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add_taint_module(mod, TAINT_FORCED_MODULE);
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add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_STILL_OK);
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}
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#endif
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@ -259,26 +259,19 @@ unsigned long get_taint(void)
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return tainted_mask;
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}
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void add_taint(unsigned flag)
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/**
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* add_taint: add a taint flag if not already set.
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* @flag: one of the TAINT_* constants.
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* @lockdep_ok: whether lock debugging is still OK.
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*
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* If something bad has gone wrong, you'll want @lockdebug_ok = false, but for
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* some notewortht-but-not-corrupting cases, it can be set to true.
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*/
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void add_taint(unsigned flag, enum lockdep_ok lockdep_ok)
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{
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/*
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* Can't trust the integrity of the kernel anymore.
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* We don't call directly debug_locks_off() because the issue
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* is not necessarily serious enough to set oops_in_progress to 1
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* Also we want to keep up lockdep for staging/out-of-tree
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* development and post-warning case.
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*/
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switch (flag) {
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case TAINT_CRAP:
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case TAINT_OOT_MODULE:
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case TAINT_WARN:
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case TAINT_FIRMWARE_WORKAROUND:
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break;
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default:
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if (__debug_locks_off())
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printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n");
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}
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if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off())
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printk(KERN_WARNING
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"Disabling lock debugging due to kernel taint\n");
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set_bit(flag, &tainted_mask);
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}
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@ -421,7 +414,8 @@ static void warn_slowpath_common(const char *file, int line, void *caller,
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print_modules();
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dump_stack();
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print_oops_end_marker();
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add_taint(taint);
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/* Just a warning, don't kill lockdep. */
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add_taint(taint, LOCKDEP_STILL_OK);
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}
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void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
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@ -2785,7 +2785,7 @@ static noinline void __schedule_bug(struct task_struct *prev)
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if (irqs_disabled())
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print_irqtrace_events(prev);
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dump_stack();
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add_taint(TAINT_WARN);
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add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
@ -2006,7 +2006,7 @@ static int proc_taint(struct ctl_table *table, int write,
|
|||
int i;
|
||||
for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
|
||||
if ((tmptaint >> i) & 1)
|
||||
add_taint(i);
|
||||
add_taint(i, LOCKDEP_STILL_OK);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
@ -166,7 +166,8 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
|
|||
print_modules();
|
||||
show_regs(regs);
|
||||
print_oops_end_marker();
|
||||
add_taint(BUG_GET_TAINT(bug));
|
||||
/* Just a warning, don't kill lockdep. */
|
||||
add_taint(BUG_GET_TAINT(bug), LOCKDEP_STILL_OK);
|
||||
return BUG_TRAP_TYPE_WARN;
|
||||
}
|
||||
|
||||
|
|
|
@ -716,7 +716,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
|
|||
print_symbol(KERN_ALERT "vma->vm_file->f_op->mmap: %s\n",
|
||||
(unsigned long)vma->vm_file->f_op->mmap);
|
||||
dump_stack();
|
||||
add_taint(TAINT_BAD_PAGE);
|
||||
add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
|
||||
}
|
||||
|
||||
static inline bool is_cow_mapping(vm_flags_t flags)
|
||||
|
|
|
@ -320,7 +320,7 @@ static void bad_page(struct page *page)
|
|||
out:
|
||||
/* Leave bad fields for debug, except PageBuddy could make trouble */
|
||||
reset_page_mapcount(page); /* remove PageBuddy */
|
||||
add_taint(TAINT_BAD_PAGE);
|
||||
add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
@ -812,7 +812,7 @@ static void __slab_error(const char *function, struct kmem_cache *cachep,
|
|||
printk(KERN_ERR "slab error in %s(): cache `%s': %s\n",
|
||||
function, cachep->name, msg);
|
||||
dump_stack();
|
||||
add_taint(TAINT_BAD_PAGE);
|
||||
add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
|
||||
}
|
||||
#endif
|
||||
|
||||
|
|
|
@ -562,7 +562,7 @@ static void slab_bug(struct kmem_cache *s, char *fmt, ...)
|
|||
printk(KERN_ERR "----------------------------------------"
|
||||
"-------------------------------------\n\n");
|
||||
|
||||
add_taint(TAINT_BAD_PAGE);
|
||||
add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
|
||||
}
|
||||
|
||||
static void slab_fix(struct kmem_cache *s, char *fmt, ...)
|
||||
|
|
|
@ -251,7 +251,7 @@ static ssize_t codec_reg_write_file(struct file *file,
|
|||
return -EINVAL;
|
||||
|
||||
/* Userspace has been fiddling around behind the kernel's back */
|
||||
add_taint(TAINT_USER);
|
||||
add_taint(TAINT_USER, LOCKDEP_NOW_UNRELIABLE);
|
||||
|
||||
snd_soc_write(codec, reg, value);
|
||||
return buf_size;
|
||||
|
|
Loading…
Reference in New Issue