Partager via

KeSetEventPageable (requête CodeQL du pilote Windows)

  • Article

Vue d’ensemble

KeSetEvent ne doit pas être appelé dans un segment paginé lorsque l’argument Wait a la valeur TRUE. Cela peut entraîner un blocage du système, le segment est paginé.

Pour plus d’informations, consultez KeSetEvent (wdm.h).

Recommandation

Ajustez l’appel KeSetEvent pour passer FALSE au paramètre d’attente.

Exemple

// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
//
// driver_snippet.c
//

#define SET_DISPATCH 1

// Template. Not called in this test.
void top_level_call() {}

#include <wdm.h>

void KeSetEventIrql_Fail1(PRKEVENT Event);

_IRQL_always_function_min_(APC_LEVEL) 
void KeSetEventIrql_Fail2(PRKEVENT Event);

_IRQL_always_function_min_(PASSIVE_LEVEL) 
void KeSetEventIrql_Pass1(PRKEVENT Event);

_IRQL_always_function_min_(PASSIVE_LEVEL) 
void KeSetEventIrql_Pass2(PRKEVENT Event);

#pragma alloc_text(PAGE, KeSetEventIrql_Fail1)
#pragma alloc_text(PAGE, KeSetEventIrql_Fail2)
#pragma alloc_text(PAGE, KeSetEventIrql_Pass2)

void KeSetEventIrql_Fail1(PRKEVENT Event)
{
    // This is a paged function.  We assume a lower limit of PASSIVE_LEVEL and an upper limit of APC_LEVEL on the IRQL.

    KeSetEvent(Event, HIGH_PRIORITY, TRUE); // ERROR: Calling with wait set to TRUE in a pageable context
}

void KeSetEventIrql_Fail2(PRKEVENT Event)
{
    // This is a paged function.  Even though it runs at APC_LEVEL, not PASSIVE_LEVEL, that's still an error.

    KeSetEvent(Event, HIGH_PRIORITY, TRUE); // ERROR: Calling with wait set to TRUE in a pageable context
}

void KeSetEventIrql_Pass1(PRKEVENT Event)
{
    // This function will potentially run at passive level but it's not pageable, so there's no issue.

    KeSetEvent(Event, HIGH_PRIORITY, TRUE);
}

void KeSetEventIrql_Pass2(PRKEVENT Event)
{
    // This function will runs at passive level and is pageable, but correctly uses FALSE in its call to KeSetEvent.

    KeSetEvent(Event, HIGH_PRIORITY, FALSE);
}

// TODO multi-threaded tests
// function has max IRQL requirement, creates two threads where one is above that requirement and one is below

Détails supplémentaires

Cette requête se trouve dans le référentiel Microsoft GitHub CodeQL. Consultez la page CodeQL et Static Tools Logo Test pour plus d’informations sur la façon dont les développeurs windows Driver peuvent télécharger et exécuter CodeQL.