forked from luck/tmp_suning_uos_patched
73d20564e0
A hrtimer can be released in its callback, but lockdep_hrtimer_exit()
dereferences the pointer after the callback returns, i.e. a potential use
after free.
Retrieve the context in which the hrtimer expires before the callback is
invoked and use it in lockdep_hrtimer_exit().
Fixes: 40db173965 ("lockdep: Add hrtimer context tracing bits")
Reported-by: syzbot+62c155c276e580cfb606@syzkaller.appspotmail.com
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200331201849.fkp2siy3vcdqvqlz@linutronix.de
223 lines
6.5 KiB
C
223 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* include/linux/irqflags.h
|
|
*
|
|
* IRQ flags tracing: follow the state of the hardirq and softirq flags and
|
|
* provide callbacks for transitions between ON and OFF states.
|
|
*
|
|
* This file gets included from lowlevel asm headers too, to provide
|
|
* wrapped versions of the local_irq_*() APIs, based on the
|
|
* raw_local_irq_*() macros from the lowlevel headers.
|
|
*/
|
|
#ifndef _LINUX_TRACE_IRQFLAGS_H
|
|
#define _LINUX_TRACE_IRQFLAGS_H
|
|
|
|
#include <linux/typecheck.h>
|
|
#include <asm/irqflags.h>
|
|
|
|
/* Currently lockdep_softirqs_on/off is used only by lockdep */
|
|
#ifdef CONFIG_PROVE_LOCKING
|
|
extern void lockdep_softirqs_on(unsigned long ip);
|
|
extern void lockdep_softirqs_off(unsigned long ip);
|
|
extern void lockdep_hardirqs_on(unsigned long ip);
|
|
extern void lockdep_hardirqs_off(unsigned long ip);
|
|
#else
|
|
static inline void lockdep_softirqs_on(unsigned long ip) { }
|
|
static inline void lockdep_softirqs_off(unsigned long ip) { }
|
|
static inline void lockdep_hardirqs_on(unsigned long ip) { }
|
|
static inline void lockdep_hardirqs_off(unsigned long ip) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
extern void trace_hardirqs_on(void);
|
|
extern void trace_hardirqs_off(void);
|
|
# define lockdep_hardirq_context(p) ((p)->hardirq_context)
|
|
# define lockdep_softirq_context(p) ((p)->softirq_context)
|
|
# define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled)
|
|
# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
|
|
# define lockdep_hardirq_enter() \
|
|
do { \
|
|
if (!current->hardirq_context++) \
|
|
current->hardirq_threaded = 0; \
|
|
} while (0)
|
|
# define lockdep_hardirq_threaded() \
|
|
do { \
|
|
current->hardirq_threaded = 1; \
|
|
} while (0)
|
|
# define lockdep_hardirq_exit() \
|
|
do { \
|
|
current->hardirq_context--; \
|
|
} while (0)
|
|
# define lockdep_softirq_enter() \
|
|
do { \
|
|
current->softirq_context++; \
|
|
} while (0)
|
|
# define lockdep_softirq_exit() \
|
|
do { \
|
|
current->softirq_context--; \
|
|
} while (0)
|
|
|
|
# define lockdep_hrtimer_enter(__hrtimer) \
|
|
({ \
|
|
bool __expires_hardirq = true; \
|
|
\
|
|
if (!__hrtimer->is_hard) { \
|
|
current->irq_config = 1; \
|
|
__expires_hardirq = false; \
|
|
} \
|
|
__expires_hardirq; \
|
|
})
|
|
|
|
# define lockdep_hrtimer_exit(__expires_hardirq) \
|
|
do { \
|
|
if (!__expires_hardirq) \
|
|
current->irq_config = 0; \
|
|
} while (0)
|
|
|
|
# define lockdep_posixtimer_enter() \
|
|
do { \
|
|
current->irq_config = 1; \
|
|
} while (0)
|
|
|
|
# define lockdep_posixtimer_exit() \
|
|
do { \
|
|
current->irq_config = 0; \
|
|
} while (0)
|
|
|
|
# define lockdep_irq_work_enter(__work) \
|
|
do { \
|
|
if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
|
|
current->irq_config = 1; \
|
|
} while (0)
|
|
# define lockdep_irq_work_exit(__work) \
|
|
do { \
|
|
if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
|
|
current->irq_config = 0; \
|
|
} while (0)
|
|
|
|
#else
|
|
# define trace_hardirqs_on() do { } while (0)
|
|
# define trace_hardirqs_off() do { } while (0)
|
|
# define lockdep_hardirq_context(p) 0
|
|
# define lockdep_softirq_context(p) 0
|
|
# define lockdep_hardirqs_enabled(p) 0
|
|
# define lockdep_softirqs_enabled(p) 0
|
|
# define lockdep_hardirq_enter() do { } while (0)
|
|
# define lockdep_hardirq_threaded() do { } while (0)
|
|
# define lockdep_hardirq_exit() do { } while (0)
|
|
# define lockdep_softirq_enter() do { } while (0)
|
|
# define lockdep_softirq_exit() do { } while (0)
|
|
# define lockdep_hrtimer_enter(__hrtimer) false
|
|
# define lockdep_hrtimer_exit(__context) do { } while (0)
|
|
# define lockdep_posixtimer_enter() do { } while (0)
|
|
# define lockdep_posixtimer_exit() do { } while (0)
|
|
# define lockdep_irq_work_enter(__work) do { } while (0)
|
|
# define lockdep_irq_work_exit(__work) do { } while (0)
|
|
#endif
|
|
|
|
#if defined(CONFIG_IRQSOFF_TRACER) || \
|
|
defined(CONFIG_PREEMPT_TRACER)
|
|
extern void stop_critical_timings(void);
|
|
extern void start_critical_timings(void);
|
|
#else
|
|
# define stop_critical_timings() do { } while (0)
|
|
# define start_critical_timings() do { } while (0)
|
|
#endif
|
|
|
|
/*
|
|
* Wrap the arch provided IRQ routines to provide appropriate checks.
|
|
*/
|
|
#define raw_local_irq_disable() arch_local_irq_disable()
|
|
#define raw_local_irq_enable() arch_local_irq_enable()
|
|
#define raw_local_irq_save(flags) \
|
|
do { \
|
|
typecheck(unsigned long, flags); \
|
|
flags = arch_local_irq_save(); \
|
|
} while (0)
|
|
#define raw_local_irq_restore(flags) \
|
|
do { \
|
|
typecheck(unsigned long, flags); \
|
|
arch_local_irq_restore(flags); \
|
|
} while (0)
|
|
#define raw_local_save_flags(flags) \
|
|
do { \
|
|
typecheck(unsigned long, flags); \
|
|
flags = arch_local_save_flags(); \
|
|
} while (0)
|
|
#define raw_irqs_disabled_flags(flags) \
|
|
({ \
|
|
typecheck(unsigned long, flags); \
|
|
arch_irqs_disabled_flags(flags); \
|
|
})
|
|
#define raw_irqs_disabled() (arch_irqs_disabled())
|
|
#define raw_safe_halt() arch_safe_halt()
|
|
|
|
/*
|
|
* The local_irq_*() APIs are equal to the raw_local_irq*()
|
|
* if !TRACE_IRQFLAGS.
|
|
*/
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
#define local_irq_enable() \
|
|
do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
|
|
#define local_irq_disable() \
|
|
do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
|
|
#define local_irq_save(flags) \
|
|
do { \
|
|
raw_local_irq_save(flags); \
|
|
trace_hardirqs_off(); \
|
|
} while (0)
|
|
|
|
|
|
#define local_irq_restore(flags) \
|
|
do { \
|
|
if (raw_irqs_disabled_flags(flags)) { \
|
|
raw_local_irq_restore(flags); \
|
|
trace_hardirqs_off(); \
|
|
} else { \
|
|
trace_hardirqs_on(); \
|
|
raw_local_irq_restore(flags); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define safe_halt() \
|
|
do { \
|
|
trace_hardirqs_on(); \
|
|
raw_safe_halt(); \
|
|
} while (0)
|
|
|
|
|
|
#else /* !CONFIG_TRACE_IRQFLAGS */
|
|
|
|
#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
|
|
#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
|
|
#define local_irq_save(flags) \
|
|
do { \
|
|
raw_local_irq_save(flags); \
|
|
} while (0)
|
|
#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
|
|
#define safe_halt() do { raw_safe_halt(); } while (0)
|
|
|
|
#endif /* CONFIG_TRACE_IRQFLAGS */
|
|
|
|
#define local_save_flags(flags) raw_local_save_flags(flags)
|
|
|
|
/*
|
|
* Some architectures don't define arch_irqs_disabled(), so even if either
|
|
* definition would be fine we need to use different ones for the time being
|
|
* to avoid build issues.
|
|
*/
|
|
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
|
|
#define irqs_disabled() \
|
|
({ \
|
|
unsigned long _flags; \
|
|
raw_local_save_flags(_flags); \
|
|
raw_irqs_disabled_flags(_flags); \
|
|
})
|
|
#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
|
|
#define irqs_disabled() raw_irqs_disabled()
|
|
#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
|
|
|
|
#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
|
|
|
|
#endif
|