printk: queue wake_up_klogd irq_work only if per-CPU areas are ready

printk_deferred(), similarly to printk_safe/printk_nmi, does not
immediately attempt to print a new message on the consoles, avoiding
calls into non-reentrant kernel paths, e.g. scheduler or timekeeping,
which potentially can deadlock the system.

Those printk() flavors, instead, rely on per-CPU flush irq_work to print
messages from safer contexts.  For same reasons (recursive scheduler or
timekeeping calls) printk() uses per-CPU irq_work in order to wake up
user space syslog/kmsg readers.

However, only printk_safe/printk_nmi do make sure that per-CPU areas
have been initialised and that it's safe to modify per-CPU irq_work.
This means that, for instance, should printk_deferred() be invoked "too
early", that is before per-CPU areas are initialised, printk_deferred()
will perform illegal per-CPU access.

Lech Perczak [0] reports that after commit 1b710b1b10ef ("char/random:
silence a lockdep splat with printk()") user-space syslog/kmsg readers
are not able to read new kernel messages.

The reason is printk_deferred() being called too early (as was pointed
out by Petr and John).

Fix printk_deferred() and do not queue per-CPU irq_work before per-CPU
areas are initialized.

Link: https://lore.kernel.org/lkml/aa0732c6-5c4e-8a8b-a1c1-75ebe3dca05b@camlintechnologies.com/
Reported-by: Lech Perczak <l.perczak@camlintechnologies.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Tested-by: Jann Horn <jannh@google.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/printk.h b/include/linux/printk.h
index 1e6108b..e061635 100644 (file)
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -202,7 +202,6 @@ __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
 void dump_stack_print_info(const char *log_lvl);
 void show_regs_print_info(const char *log_lvl);
 extern asmlinkage void dump_stack(void) __cold;
-extern void printk_safe_init(void);
 extern void printk_safe_flush(void);
 extern void printk_safe_flush_on_panic(void);
 #else
@@ -269,10 +268,6 @@ static inline void dump_stack(void)
 {
 }
 
-static inline void printk_safe_init(void)
-{
-}
-
 static inline void printk_safe_flush(void)
 {
 }

diff --git a/init/main.c b/init/main.c
index e488213..a48617f 100644 (file)
--- a/init/main.c
+++ b/init/main.c
@@ -913,7 +913,6 @@ asmlinkage __visible void __init start_kernel(void)
        boot_init_stack_canary();
 
        time_init();
-       printk_safe_init();
        perf_event_init();
        profile_init();
        call_function_init();

diff --git a/kernel/printk/internal.h b/kernel/printk/internal.h
index c8e6ab6..b2b0f52 100644 (file)
--- a/kernel/printk/internal.h
+++ b/kernel/printk/internal.h
@@ -23,6 +23,9 @@ __printf(1, 0) int vprintk_func(const char *fmt, va_list args);
 void __printk_safe_enter(void);
 void __printk_safe_exit(void);
 
+void printk_safe_init(void);
+bool printk_percpu_data_ready(void);
+
 #define printk_safe_enter_irqsave(flags)       \
        do {                                    \
                local_irq_save(flags);          \
@@ -64,4 +67,6 @@ __printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; }
 #define printk_safe_enter_irq() local_irq_disable()
 #define printk_safe_exit_irq() local_irq_enable()
 
+static inline void printk_safe_init(void) { }
+static inline bool printk_percpu_data_ready(void) { return false; }
 #endif /* CONFIG_PRINTK */

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 633f41a..9a9b615 100644 (file)
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -460,6 +460,18 @@ static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
 static char *log_buf = __log_buf;
 static u32 log_buf_len = __LOG_BUF_LEN;
 
+/*
+ * We cannot access per-CPU data (e.g. per-CPU flush irq_work) before
+ * per_cpu_areas are initialised. This variable is set to true when
+ * it's safe to access per-CPU data.
+ */
+static bool __printk_percpu_data_ready __read_mostly;
+
+bool printk_percpu_data_ready(void)
+{
+       return __printk_percpu_data_ready;
+}
+
 /* Return log buffer address */
 char *log_buf_addr_get(void)
 {
@@ -1146,12 +1158,28 @@ static void __init log_buf_add_cpu(void)
 static inline void log_buf_add_cpu(void) {}
 #endif /* CONFIG_SMP */
 
+static void __init set_percpu_data_ready(void)
+{
+       printk_safe_init();
+       /* Make sure we set this flag only after printk_safe() init is done */
+       barrier();
+       __printk_percpu_data_ready = true;
+}
+
 void __init setup_log_buf(int early)
 {
        unsigned long flags;
        char *new_log_buf;
        unsigned int free;
 
+       /*
+        * Some archs call setup_log_buf() multiple times - first is very
+        * early, e.g. from setup_arch(), and second - when percpu_areas
+        * are initialised.
+        */
+       if (!early)
+               set_percpu_data_ready();
+
        if (log_buf != __log_buf)
                return;
 
@@ -2975,6 +3003,9 @@ static DEFINE_PER_CPU(struct irq_work, wake_up_klogd_work) = {
 
 void wake_up_klogd(void)
 {
+       if (!printk_percpu_data_ready())
+               return;
+
        preempt_disable();
        if (waitqueue_active(&log_wait)) {
                this_cpu_or(printk_pending, PRINTK_PENDING_WAKEUP);
@@ -2985,6 +3016,9 @@ void wake_up_klogd(void)
 
 void defer_console_output(void)
 {
+       if (!printk_percpu_data_ready())
+               return;
+
        preempt_disable();
        __this_cpu_or(printk_pending, PRINTK_PENDING_OUTPUT);
        irq_work_queue(this_cpu_ptr(&wake_up_klogd_work));

diff --git a/kernel/printk/printk_safe.c b/kernel/printk/printk_safe.c
index b4045e7..d9a659a 100644 (file)
--- a/kernel/printk/printk_safe.c
+++ b/kernel/printk/printk_safe.c
@@ -27,7 +27,6 @@
  * There are situations when we want to make sure that all buffers
  * were handled or when IRQs are blocked.
  */
-static int printk_safe_irq_ready __read_mostly;
 
 #define SAFE_LOG_BUF_LEN ((1 << CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT) -    \
                                sizeof(atomic_t) -                      \
@@ -51,7 +50,7 @@ static DEFINE_PER_CPU(struct printk_safe_seq_buf, nmi_print_seq);
 /* Get flushed in a more safe context. */
 static void queue_flush_work(struct printk_safe_seq_buf *s)
 {
-       if (printk_safe_irq_ready)
+       if (printk_percpu_data_ready())
                irq_work_queue(&s->work);
 }
 
@@ -402,14 +401,6 @@ void __init printk_safe_init(void)
 #endif
        }
 
-       /*
-        * In the highly unlikely event that a NMI were to trigger at
-        * this moment. Make sure IRQ work is set up before this
-        * variable is set.
-        */
-       barrier();
-       printk_safe_irq_ready = 1;
-
        /* Flush pending messages that did not have scheduled IRQ works. */
        printk_safe_flush();
 }