From d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 02:45:28 +0000
Subject: [PATCH] add boot partition size
---
kernel/kernel/panic.c | 217 +++++++++++++++++++++++++++++++++++-------------------
1 files changed, 141 insertions(+), 76 deletions(-)
diff --git a/kernel/kernel/panic.c b/kernel/kernel/panic.c
index 6b33469..873fedb 100644
--- a/kernel/kernel/panic.c
+++ b/kernel/kernel/panic.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/kernel/panic.c
*
@@ -11,6 +12,7 @@
#include <linux/debug_locks.h>
#include <linux/sched/debug.h>
#include <linux/interrupt.h>
+#include <linux/kgdb.h>
#include <linux/kmsg_dump.h>
#include <linux/kallsyms.h>
#include <linux/notifier.h>
@@ -34,6 +36,14 @@
#define PANIC_TIMER_STEP 100
#define PANIC_BLINK_SPD 18
+#ifdef CONFIG_SMP
+/*
+ * Should we dump all CPUs backtraces in an oops event?
+ * Defaults to 0, can be changed via sysctl.
+ */
+unsigned int __read_mostly sysctl_oops_all_cpu_backtrace;
+#endif /* CONFIG_SMP */
+
int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
static unsigned long tainted_mask =
IS_ENABLED(CONFIG_GCC_PLUGIN_RANDSTRUCT) ? (1 << TAINT_RANDSTRUCT) : 0;
@@ -42,15 +52,23 @@
static DEFINE_SPINLOCK(pause_on_oops_lock);
bool crash_kexec_post_notifiers;
int panic_on_warn __read_mostly;
+unsigned long panic_on_taint;
+bool panic_on_taint_nousertaint = false;
int panic_timeout = CONFIG_PANIC_TIMEOUT;
EXPORT_SYMBOL_GPL(panic_timeout);
-ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
-EXPORT_SYMBOL(panic_notifier_list);
+#define PANIC_PRINT_TASK_INFO 0x00000001
+#define PANIC_PRINT_MEM_INFO 0x00000002
+#define PANIC_PRINT_TIMER_INFO 0x00000004
+#define PANIC_PRINT_LOCK_INFO 0x00000008
+#define PANIC_PRINT_FTRACE_INFO 0x00000010
+#define PANIC_PRINT_ALL_PRINTK_MSG 0x00000020
+unsigned long panic_print;
-void (*vendor_panic_cb)(u64 sp);
-EXPORT_SYMBOL_GPL(vendor_panic_cb);
+ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
+
+EXPORT_SYMBOL(panic_notifier_list);
static long no_blink(int state)
{
@@ -127,6 +145,27 @@
}
EXPORT_SYMBOL(nmi_panic);
+static void panic_print_sys_info(void)
+{
+ if (panic_print & PANIC_PRINT_ALL_PRINTK_MSG)
+ console_flush_on_panic(CONSOLE_REPLAY_ALL);
+
+ if (panic_print & PANIC_PRINT_TASK_INFO)
+ show_state();
+
+ if (panic_print & PANIC_PRINT_MEM_INFO)
+ show_mem(0, NULL);
+
+ if (panic_print & PANIC_PRINT_TIMER_INFO)
+ sysrq_timer_list_show();
+
+ if (panic_print & PANIC_PRINT_LOCK_INFO)
+ debug_show_all_locks();
+
+ if (panic_print & PANIC_PRINT_FTRACE_INFO)
+ ftrace_dump(DUMP_ALL);
+}
+
/**
* panic - halt the system
* @fmt: The text string to print
@@ -138,8 +177,9 @@
void panic(const char *fmt, ...)
{
static char buf[1024];
+ va_list args2;
va_list args;
- long i, i_next = 0;
+ long i, i_next = 0, len;
int state = 0;
int old_cpu, this_cpu;
bool _crash_kexec_post_notifiers = crash_kexec_post_notifiers;
@@ -152,6 +192,21 @@
*/
local_irq_disable();
preempt_disable_notrace();
+
+ console_verbose();
+ pr_emerg("Kernel panic - not syncing:\n");
+ va_start(args2, fmt);
+ va_copy(args, args2);
+ vprintk(fmt, args2);
+ va_end(args2);
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+ /*
+ * Avoid nested stack-dumping if a panic occurs during oops processing
+ */
+ if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
+ dump_stack();
+#endif
+ pr_flush(1000, true);
/*
* It's possible to come here directly from a panic-assertion and
@@ -174,21 +229,19 @@
if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu)
panic_smp_self_stop();
- console_verbose();
bust_spinlocks(1);
- va_start(args, fmt);
- vsnprintf(buf, sizeof(buf), fmt, args);
+ len = vscnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
- if (vendor_panic_cb)
- vendor_panic_cb(0);
- pr_emerg("Kernel panic - not syncing: %s\n", buf);
-#ifdef CONFIG_DEBUG_BUGVERBOSE
+
+ if (len && buf[len - 1] == '\n')
+ buf[len - 1] = '\0';
+
/*
- * Avoid nested stack-dumping if a panic occurs during oops processing
+ * If kgdb is enabled, give it a chance to run before we stop all
+ * the other CPUs or else we won't be able to debug processes left
+ * running on them.
*/
- if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
- dump_stack();
-#endif
+ kgdb_panic(buf);
/*
* If we have crashed and we have a crash kernel loaded let it handle
@@ -199,7 +252,6 @@
* Bypass the panic_cpu check and call __crash_kexec directly.
*/
if (!_crash_kexec_post_notifiers) {
- printk_safe_flush_on_panic();
__crash_kexec(NULL);
/*
@@ -223,8 +275,6 @@
*/
atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
- /* Call flush even twice. It tries harder with a single online CPU */
- printk_safe_flush_on_panic();
kmsg_dump(KMSG_DUMP_PANIC);
/*
@@ -253,7 +303,9 @@
* panic() is not being callled from OOPS.
*/
debug_locks_off();
- console_flush_on_panic();
+ console_flush_on_panic(CONSOLE_FLUSH_PENDING);
+
+ panic_print_sys_info();
if (!panic_blink)
panic_blink = no_blink;
@@ -294,14 +346,12 @@
}
#endif
#if defined(CONFIG_S390)
- {
- unsigned long caller;
-
- caller = (unsigned long)__builtin_return_address(0);
- disabled_wait(caller);
- }
+ disabled_wait();
#endif
pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf);
+
+ /* Do not scroll important messages printed above */
+ suppress_printk = 1;
local_irq_enable();
for (i = 0; ; i += PANIC_TIMER_STEP) {
touch_softlockup_watchdog();
@@ -343,7 +393,7 @@
/**
* print_tainted - return a string to represent the kernel taint state.
*
- * For individual taint flag meanings, see Documentation/sysctl/kernel.txt
+ * For individual taint flag meanings, see Documentation/admin-guide/sysctl/kernel.rst
*
* The string is overwritten by the next call to print_tainted(),
* but is always NULL terminated.
@@ -396,6 +446,11 @@
pr_warn("Disabling lock debugging due to kernel taint\n");
set_bit(flag, &tainted_mask);
+
+ if (tainted_mask & panic_on_taint) {
+ panic_on_taint = 0;
+ panic("panic_on_taint set ...");
+ }
}
EXPORT_SYMBOL(add_taint);
@@ -452,7 +507,7 @@
* Return true if the calling CPU is allowed to print oops-related info.
* This is a bit racy..
*/
-int oops_may_print(void)
+bool oops_may_print(void)
{
return pause_on_oops_flag == 0;
}
@@ -477,6 +532,9 @@
/* can't trust the integrity of the kernel anymore: */
debug_locks_off();
do_oops_enter_exit();
+
+ if (sysctl_oops_all_cpu_backtrace)
+ trigger_all_cpu_backtrace();
}
/*
@@ -486,19 +544,22 @@
static int init_oops_id(void)
{
+#ifndef CONFIG_PREEMPT_RT
if (!oops_id)
get_random_bytes(&oops_id, sizeof(oops_id));
else
+#endif
oops_id++;
return 0;
}
late_initcall(init_oops_id);
-void print_oops_end_marker(void)
+static void print_oops_end_marker(void)
{
init_oops_id();
pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id);
+ pr_flush(1000, true);
}
/*
@@ -522,9 +583,6 @@
{
disable_trace_on_warning();
- if (args)
- pr_warn(CUT_HERE);
-
if (file)
pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS\n",
raw_smp_processor_id(), current->pid, file, line,
@@ -535,6 +593,11 @@
if (args)
vprintk(args->fmt, args->args);
+
+ print_modules();
+
+ if (regs)
+ show_regs(regs);
if (panic_on_warn) {
/*
@@ -547,11 +610,7 @@
panic("panic_on_warn set ...\n");
}
- print_modules();
-
- if (regs)
- show_regs(regs);
- else
+ if (!regs)
dump_stack();
print_irqtrace_events(current);
@@ -562,37 +621,26 @@
add_taint(taint, LOCKDEP_STILL_OK);
}
-#ifdef WANT_WARN_ON_SLOWPATH
-void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
+#ifndef __WARN_FLAGS
+void warn_slowpath_fmt(const char *file, int line, unsigned taint,
+ const char *fmt, ...)
{
struct warn_args args;
- args.fmt = fmt;
- va_start(args.args, fmt);
- __warn(file, line, __builtin_return_address(0), TAINT_WARN, NULL,
- &args);
- va_end(args.args);
-}
-EXPORT_SYMBOL(warn_slowpath_fmt);
+ pr_warn(CUT_HERE);
-void warn_slowpath_fmt_taint(const char *file, int line,
- unsigned taint, const char *fmt, ...)
-{
- struct warn_args args;
+ if (!fmt) {
+ __warn(file, line, __builtin_return_address(0), taint,
+ NULL, NULL);
+ return;
+ }
args.fmt = fmt;
va_start(args.args, fmt);
__warn(file, line, __builtin_return_address(0), taint, NULL, &args);
va_end(args.args);
}
-EXPORT_SYMBOL(warn_slowpath_fmt_taint);
-
-void warn_slowpath_null(const char *file, int line)
-{
- pr_warn(CUT_HERE);
- __warn(file, line, __builtin_return_address(0), TAINT_WARN, NULL, NULL);
-}
-EXPORT_SYMBOL(warn_slowpath_null);
+EXPORT_SYMBOL(warn_slowpath_fmt);
#else
void __warn_printk(const char *fmt, ...)
{
@@ -618,16 +666,14 @@
return 0;
}
-DEFINE_SIMPLE_ATTRIBUTE(clear_warn_once_fops,
- NULL,
- clear_warn_once_set,
- "%lld\n");
+DEFINE_DEBUGFS_ATTRIBUTE(clear_warn_once_fops, NULL, clear_warn_once_set,
+ "%lld\n");
static __init int register_warn_debugfs(void)
{
/* Don't care about failure */
- debugfs_create_file("clear_warn_once", 0200, NULL,
- NULL, &clear_warn_once_fops);
+ debugfs_create_file_unsafe("clear_warn_once", 0200, NULL, NULL,
+ &clear_warn_once_fops);
return 0;
}
@@ -640,27 +686,19 @@
* Called when gcc's -fstack-protector feature is used, and
* gcc detects corruption of the on-stack canary value
*/
-__visible void __stack_chk_fail(void)
+__visible noinstr void __stack_chk_fail(void)
{
+ instrumentation_begin();
panic("stack-protector: Kernel stack is corrupted in: %pB",
__builtin_return_address(0));
+ instrumentation_end();
}
EXPORT_SYMBOL(__stack_chk_fail);
#endif
-#ifdef CONFIG_ARCH_HAS_REFCOUNT
-void refcount_error_report(struct pt_regs *regs, const char *err)
-{
- WARN_RATELIMIT(1, "refcount_t %s at %pB in %s[%d], uid/euid: %u/%u\n",
- err, (void *)instruction_pointer(regs),
- current->comm, task_pid_nr(current),
- from_kuid_munged(&init_user_ns, current_uid()),
- from_kuid_munged(&init_user_ns, current_euid()));
-}
-#endif
-
core_param(panic, panic_timeout, int, 0644);
+core_param(panic_print, panic_print, ulong, 0644);
core_param(pause_on_oops, pause_on_oops, int, 0644);
core_param(panic_on_warn, panic_on_warn, int, 0644);
core_param(crash_kexec_post_notifiers, crash_kexec_post_notifiers, bool, 0644);
@@ -674,3 +712,30 @@
return 0;
}
early_param("oops", oops_setup);
+
+static int __init panic_on_taint_setup(char *s)
+{
+ char *taint_str;
+
+ if (!s)
+ return -EINVAL;
+
+ taint_str = strsep(&s, ",");
+ if (kstrtoul(taint_str, 16, &panic_on_taint))
+ return -EINVAL;
+
+ /* make sure panic_on_taint doesn't hold out-of-range TAINT flags */
+ panic_on_taint &= TAINT_FLAGS_MAX;
+
+ if (!panic_on_taint)
+ return -EINVAL;
+
+ if (s && !strcmp(s, "nousertaint"))
+ panic_on_taint_nousertaint = true;
+
+ pr_info("panic_on_taint: bitmask=0x%lx nousertaint_mode=%sabled\n",
+ panic_on_taint, panic_on_taint_nousertaint ? "en" : "dis");
+
+ return 0;
+}
+early_param("panic_on_taint", panic_on_taint_setup);
--
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