From: Zqiang <qiang.zhang@xxxxxxxxxxxxx> Subject: irq_work: record irq_work_queue() call stack Add the irq_work_queue() call stack into the KASAN auxiliary stack in order to improve KASAN reports. this will let us know where the irq work be queued. Link: https://lkml.kernel.org/r/20210331063202.28770-1-qiang.zhang@xxxxxxxxxxxxx Signed-off-by: Zqiang <qiang.zhang@xxxxxxxxxxxxx> Reviewed-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Acked-by: Andrey Konovalov <andreyknvl@xxxxxxxxx> Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx> Cc: Oleg Nesterov <oleg@xxxxxxxxxx> Cc: Walter Wu <walter-zh.wu@xxxxxxxxxxxx> Cc: Frederic Weisbecker <frederic@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- kernel/irq_work.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/kernel/irq_work.c~irq_work-record-irq_work_queue-call-stack +++ a/kernel/irq_work.c @@ -19,7 +19,7 @@ #include <linux/notifier.h> #include <linux/smp.h> #include <asm/processor.h> - +#include <linux/kasan.h> static DEFINE_PER_CPU(struct llist_head, raised_list); static DEFINE_PER_CPU(struct llist_head, lazy_list); @@ -70,6 +70,9 @@ bool irq_work_queue(struct irq_work *wor if (!irq_work_claim(work)) return false; + /*record irq_work call stack in order to print it in KASAN reports*/ + kasan_record_aux_stack(work); + /* Queue the entry and raise the IPI if needed. */ preempt_disable(); __irq_work_queue_local(work); @@ -98,6 +101,8 @@ bool irq_work_queue_on(struct irq_work * if (!irq_work_claim(work)) return false; + kasan_record_aux_stack(work); + preempt_disable(); if (cpu != smp_processor_id()) { /* Arch remote IPI send/receive backend aren't NMI safe */ _
