From a44f71a9ab99b509fec9d5a9f5c222debd89934f Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 25 Sep 2019 16:48:11 -0700 Subject: [PATCH] bug: move WARN_ON() "cut here" into exception handler The original clean up of "cut here" missed the WARN_ON() case (that does not have a printk message), which was fixed recently by adding an explicit printk of "cut here". This had the downside of adding a printk() to every WARN_ON() caller, which reduces the utility of using an instruction exception to streamline the resulting code. By making this a new BUGFLAG, all of these can be removed and "cut here" can be handled by the exception handler. This was very pronounced on PowerPC, but the effect can be seen on x86 as well. The resulting text size of a defconfig build shows some small savings from this patch: text data bss dec hex filename 19691167 5134320 1646664 26472151 193eed7 vmlinux.before 19676362 5134260 1663048 26473670 193f4c6 vmlinux.after This change also opens the door for creating something like BUG_MSG(), where a custom printk() before issuing BUG(), without confusing the "cut here" line. Link: http://lkml.kernel.org/r/201908200943.601DD59DCE@keescook Fixes: 6b15f678fb7d ("include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures") Signed-off-by: Kees Cook Reported-by: Christophe Leroy Cc: Peter Zijlstra Cc: Christophe Leroy Cc: Drew Davenport Cc: Arnd Bergmann Cc: "Steven Rostedt (VMware)" Cc: Feng Tang Cc: Petr Mladek Cc: Mauro Carvalho Chehab Cc: Borislav Petkov Cc: YueHaibing Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-generic/bug.h | 8 +++----- lib/bug.c | 11 +++++++++-- 2 files changed, 12 insertions(+), 7 deletions(-) diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h index b4a2639130a0..384b5c835ced 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_NO_CUT_HERE (1 << 3) /* CUT_HERE already sent */ #define BUGFLAG_TAINT(taint) ((taint) << 8) #define BUG_GET_TAINT(bug) ((bug)->flags >> 8) #endif @@ -86,13 +87,10 @@ void warn_slowpath_fmt(const char *file, const int line, unsigned taint, warn_slowpath_fmt(__FILE__, __LINE__, taint, arg) #else extern __printf(1, 2) void __warn_printk(const char *fmt, ...); -#define __WARN() do { \ - printk(KERN_WARNING CUT_HERE); \ - __WARN_FLAGS(BUGFLAG_TAINT(TAINT_WARN)); \ - } while (0) +#define __WARN() __WARN_FLAGS(BUGFLAG_TAINT(TAINT_WARN)) #define __WARN_printf(taint, arg...) do { \ __warn_printk(arg); \ - __WARN_FLAGS(BUGFLAG_TAINT(taint)); \ + __WARN_FLAGS(BUGFLAG_NO_CUT_HERE | BUGFLAG_TAINT(taint));\ } while (0) #define WARN_ON_ONCE(condition) ({ \ int __ret_warn_on = !!(condition); \ diff --git a/lib/bug.c b/lib/bug.c index 1077366f496b..8c98af0bf585 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_NO_CUT_HERE) == 0) + printk(KERN_DEFAULT CUT_HERE); + if (warning) { /* this is a WARN_ON rather than BUG/BUG_ON */ __warn(file, line, (void *)bugaddr, BUG_GET_TAINT(bug), regs, @@ -188,8 +197,6 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs) return BUG_TRAP_TYPE_WARN; } - printk(KERN_DEFAULT CUT_HERE); - if (file) pr_crit("kernel BUG at %s:%u!\n", file, line); else -- 2.30.2