From 55eba18262cbc289ded9e7a8fe1b61a92140b59a Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Tue, 24 Jan 2023 11:30:00 -0800 Subject: panic: Consolidate open-coded panic_on_warn checks commit 79cc1ba7badf9e7a12af99695a557e9ce27ee967 upstream. Several run-time checkers (KASAN, UBSAN, KFENCE, KCSAN, sched) roll their own warnings, and each check "panic_on_warn". Consolidate this into a single function so that future instrumentation can be added in a single location. Cc: Marco Elver Cc: Dmitry Vyukov Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Juri Lelli Cc: Vincent Guittot Cc: Dietmar Eggemann Cc: Steven Rostedt Cc: Ben Segall Cc: Mel Gorman Cc: Daniel Bristot de Oliveira Cc: Valentin Schneider Cc: Andrey Ryabinin Cc: Alexander Potapenko Cc: Andrey Konovalov Cc: Vincenzo Frascino Cc: Andrew Morton Cc: David Gow Cc: tangmeng Cc: Jann Horn Cc: Shuah Khan Cc: Petr Mladek Cc: "Paul E. McKenney" Cc: Sebastian Andrzej Siewior Cc: "Guilherme G. Piccoli" Cc: Tiezhu Yang Cc: kasan-dev@googlegroups.com Cc: linux-mm@kvack.org Reviewed-by: Luis Chamberlain Signed-off-by: Kees Cook Reviewed-by: Marco Elver Reviewed-by: Andrey Konovalov Link: https://lore.kernel.org/r/20221117234328.594699-4-keescook@chromium.org Signed-off-by: Eric Biggers Signed-off-by: Sasha Levin --- include/linux/kernel.h | 1 + kernel/kcsan/report.c | 4 ++-- kernel/panic.c | 9 +++++++-- kernel/sched/core.c | 3 +-- lib/ubsan.c | 3 +-- mm/kasan/report.c | 4 ++-- 6 files changed, 14 insertions(+), 10 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 084d97070ed9..394f10fc29aa 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -320,6 +320,7 @@ extern long (*panic_blink)(int state); __printf(1, 2) void panic(const char *fmt, ...) __noreturn __cold; void nmi_panic(struct pt_regs *regs, const char *msg); +void check_panic_on_warn(const char *origin); extern void oops_enter(void); extern void oops_exit(void); extern bool oops_may_print(void); diff --git a/kernel/kcsan/report.c b/kernel/kcsan/report.c index d3bf87e6007c..069830f5a5d2 100644 --- a/kernel/kcsan/report.c +++ b/kernel/kcsan/report.c @@ -630,8 +630,8 @@ void kcsan_report(const volatile void *ptr, size_t size, int access_type, bool reported = value_change != KCSAN_VALUE_CHANGE_FALSE && print_report(value_change, type, &ai, other_info); - if (reported && panic_on_warn) - panic("panic_on_warn set ...\n"); + if (reported) + check_panic_on_warn("KCSAN"); release_report(&flags, other_info); } diff --git a/kernel/panic.c b/kernel/panic.c index 09f0802212c3..0da47888f72e 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -192,6 +192,12 @@ static void panic_print_sys_info(void) ftrace_dump(DUMP_ALL); } +void check_panic_on_warn(const char *origin) +{ + if (panic_on_warn) + panic("%s: panic_on_warn set ...\n", origin); +} + /** * panic - halt the system * @fmt: The text string to print @@ -630,8 +636,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint, if (regs) show_regs(regs); - if (panic_on_warn) - panic("panic_on_warn set ...\n"); + check_panic_on_warn("kernel"); if (!regs) dump_stack(); diff --git a/kernel/sched/core.c b/kernel/sched/core.c index a875bc59804e..1303a2607f1f 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4280,8 +4280,7 @@ static noinline void __schedule_bug(struct task_struct *prev) pr_err("Preemption disabled at:"); print_ip_sym(KERN_ERR, preempt_disable_ip); } - if (panic_on_warn) - panic("scheduling while atomic\n"); + check_panic_on_warn("scheduling while atomic"); dump_stack(); add_taint(TAINT_WARN, LOCKDEP_STILL_OK); diff --git a/lib/ubsan.c b/lib/ubsan.c index d81d107f64f4..ee14c46cac89 100644 --- a/lib/ubsan.c +++ b/lib/ubsan.c @@ -151,8 +151,7 @@ static void ubsan_epilogue(void) current->in_ubsan--; - if (panic_on_warn) - panic("panic_on_warn set ...\n"); + check_panic_on_warn("UBSAN"); } static void handle_overflow(struct overflow_data *data, void *lhs, diff --git a/mm/kasan/report.c b/mm/kasan/report.c index 91714acea0d6..2f5e96ac4d00 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -95,8 +95,8 @@ static void end_report(unsigned long *flags) pr_err("==================================================================\n"); add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irqrestore(&report_lock, *flags); - if (panic_on_warn && !test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags)) - panic("panic_on_warn set ...\n"); + if (!test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags)) + check_panic_on_warn("KASAN"); kasan_enable_current(); } -- cgit v1.2.3