On Mon, Aug 19, 2019 at 04:41:11PM -0700, Kees Cook wrote: > diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h > index 588dd59a5b72..da471fcc5487 100644 > --- a/include/asm-generic/bug.h > +++ b/include/asm-generic/bug.h > @@ -10,6 +10,7 @@ > #define BUGFLAG_WARNING (1 << 0) > #define BUGFLAG_ONCE (1 << 1) > #define BUGFLAG_DONE (1 << 2) > +#define BUGFLAG_PRINTK (1 << 3) > #define BUGFLAG_TAINT(taint) ((taint) << 8) > #define BUG_GET_TAINT(bug) ((bug)->flags >> 8) > #endif > diff --git a/lib/bug.c b/lib/bug.c > index 1077366f496b..6c22e8a6f9de 100644 > --- a/lib/bug.c > +++ b/lib/bug.c > @@ -181,6 +181,15 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs) > } > } > > + /* > + * BUG() and WARN_ON() families don't print a custom debug message > + * before triggering the exception handler, so we must add the > + * "cut here" line now. WARN() issues its own "cut here" before the > + * extra debugging message it writes before triggering the handler. > + */ > + if ((bug->flags & BUGFLAG_PRINTK) == 0) > + printk(KERN_DEFAULT CUT_HERE); I'm not loving that BUGFLAG_PRINTK name, BUGFLAG_CUT_HERE makes more sense to me.
