diff options
Diffstat (limited to 'kernel/kcsan/core.c')
| -rw-r--r-- | kernel/kcsan/core.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c index 732623c30359..0fe068192781 100644 --- a/kernel/kcsan/core.c +++ b/kernel/kcsan/core.c @@ -291,6 +291,20 @@ static inline unsigned int get_delay(void) 0); } +void kcsan_save_irqtrace(struct task_struct *task) +{ +#ifdef CONFIG_TRACE_IRQFLAGS + task->kcsan_save_irqtrace = task->irqtrace; +#endif +} + +void kcsan_restore_irqtrace(struct task_struct *task) +{ +#ifdef CONFIG_TRACE_IRQFLAGS + task->irqtrace = task->kcsan_save_irqtrace; +#endif +} + /* * Pull everything together: check_access() below contains the performance * critical operations; the fast-path (including check_access) functions should @@ -336,9 +350,11 @@ static noinline void kcsan_found_watchpoint(const volatile void *ptr, flags = user_access_save(); if (consumed) { + kcsan_save_irqtrace(current); kcsan_report(ptr, size, type, KCSAN_VALUE_CHANGE_MAYBE, KCSAN_REPORT_CONSUMED_WATCHPOINT, watchpoint - watchpoints); + kcsan_restore_irqtrace(current); } else { /* * The other thread may not print any diagnostics, as it has @@ -396,6 +412,12 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type) goto out; } + /* + * Save and restore the IRQ state trace touched by KCSAN, since KCSAN's + * runtime is entered for every memory access, and potentially useful + * information is lost if dirtied by KCSAN. + */ + kcsan_save_irqtrace(current); if (!kcsan_interrupt_watcher) local_irq_save(irq_flags); @@ -539,6 +561,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type) out_unlock: if (!kcsan_interrupt_watcher) local_irq_restore(irq_flags); + kcsan_restore_irqtrace(current); out: user_access_restore(ua_flags); } |