Kernel/linux-next
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git synced 2024-12-28 16:52:18 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

panic: Consolidate open-coded panic_on_warn checks

Browse Source 
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 <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ben Segall <bsegall@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Gow <davidgow@google.com>
Cc: tangmeng <tangmeng@uniontech.com>
Cc: Jann Horn <jannh@google.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: kasan-dev@googlegroups.com
Cc: linux-mm@kvack.org
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Link: https://lore.kernel.org/r/20221117234328.594699-4-keescook@chromium.org
This commit is contained in:
Kees Cook 2022-11-17 15:43:24 -08:00
parent de92f65719
commit 79cc1ba7ba
7 changed files with 14 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/panic.h
View File

@ -11,6 +11,7 @@ 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);

3
kernel/kcsan/report.c
View File

@ -492,8 +492,7 @@ static void print_report(enum kcsan_value_change value_change,
dump_stack_print_info(KERN_DEFAULT);
pr_err("==================================================================\n");
if (panic_on_warn)
panic("panic_on_warn set ...\n");
check_panic_on_warn("KCSAN");
}
static void release_report(unsigned long *flags, struct other_info *other_info)

9
kernel/panic.c
View File

@ -201,6 +201,12 @@ static void panic_print_sys_info(bool console_flush)
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
@ -619,8 +625,7 @@ 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();

3
kernel/sched/core.c
View File

@ -5729,8 +5729,7 @@ 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);

3
lib/ubsan.c
View File

@ -154,8 +154,7 @@ static void ubsan_epilogue(void)
current->in_ubsan--;
if (panic_on_warn)
panic("panic_on_warn set ...\n");
check_panic_on_warn("UBSAN");
}
void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)

4
mm/kasan/report.c
View File

@ -164,8 +164,8 @@ static void end_report(unsigned long *flags, void *addr)
(unsigned long)addr);
pr_err("==================================================================\n");
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");
if (kasan_arg_fault == KASAN_ARG_FAULT_PANIC)
panic("kasan.fault=panic set ...\n");
add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);

3
mm/kfence/report.c
View File

@ -268,8 +268,7 @@ void kfence_report_error(unsigned long address, bool is_write, struct pt_regs *r
lockdep_on();
if (panic_on_warn)
panic("panic_on_warn set ...\n");
check_panic_on_warn("KFENCE");
/* We encountered a memory safety error, taint the kernel! */
add_taint(TAINT_BAD_PAGE, LOCKDEP_STILL_OK);