Adding debian version 4.19.249-2.debian/4.19.249-2debian

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 308 insertions, 0 deletions

diff --git a/debian/patches-rt/0305-lib-ubsan-Don-t-seralize-UBSAN-report.patch b/debian/patches-rt/0305-lib-ubsan-Don-t-seralize-UBSAN-report.patch
new file mode 100644
index 000000000..0d8dba5e3
--- /dev/null
+++ b/debian/patches-rt/0305-lib-ubsan-Don-t-seralize-UBSAN-report.patch
@@ -0,0 +1,308 @@
+From 7310d776df7bc46b442c51d6b723b77ef6614830 Mon Sep 17 00:00:00 2001
+From: Julien Grall <julien.grall@arm.com>
+Date: Fri, 20 Sep 2019 11:08:35 +0100
+Subject: [PATCH 305/347] lib/ubsan: Don't seralize UBSAN report
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+[ Upstream commit 4702c28ac777b27acb499cbd5e8e787ce1a7d82d ]
+
+At the moment, UBSAN report will be serialized using a spin_lock(). On
+RT-systems, spinlocks are turned to rt_spin_lock and may sleep. This will
+result to the following splat if the undefined behavior is in a context
+that can sleep:
+
+| BUG: sleeping function called from invalid context at /src/linux/kernel/locking/rtmutex.c:968
+| in_atomic(): 1, irqs_disabled(): 128, pid: 3447, name: make
+| 1 lock held by make/3447:
+|  #0: 000000009a966332 (&mm->mmap_sem){++++}, at: do_page_fault+0x140/0x4f8
+| Preemption disabled at:
+| [<ffff000011324a4c>] rt_mutex_futex_unlock+0x4c/0xb0
+| CPU: 3 PID: 3447 Comm: make Tainted: G        W         5.2.14-rt7-01890-ge6e057589653 #911
+| Call trace:
+|  dump_backtrace+0x0/0x148
+|  show_stack+0x14/0x20
+|  dump_stack+0xbc/0x104
+|  ___might_sleep+0x154/0x210
+|  rt_spin_lock+0x68/0xa0
+|  ubsan_prologue+0x30/0x68
+|  handle_overflow+0x64/0xe0
+|  __ubsan_handle_add_overflow+0x10/0x18
+|  __lock_acquire+0x1c28/0x2a28
+|  lock_acquire+0xf0/0x370
+|  _raw_spin_lock_irqsave+0x58/0x78
+|  rt_mutex_futex_unlock+0x4c/0xb0
+|  rt_spin_unlock+0x28/0x70
+|  get_page_from_freelist+0x428/0x2b60
+|  __alloc_pages_nodemask+0x174/0x1708
+|  alloc_pages_vma+0x1ac/0x238
+|  __handle_mm_fault+0x4ac/0x10b0
+|  handle_mm_fault+0x1d8/0x3b0
+|  do_page_fault+0x1c8/0x4f8
+|  do_translation_fault+0xb8/0xe0
+|  do_mem_abort+0x3c/0x98
+|  el0_da+0x20/0x24
+
+The spin_lock() will protect against multiple CPUs to output a report
+together, I guess to prevent them to be interleaved. However, they can
+still interleave with other messages (and even splat from __migth_sleep).
+
+So the lock usefulness seems pretty limited. Rather than trying to
+accomodate RT-system by switching to a raw_spin_lock(), the lock is now
+completely dropped.
+
+Link: https://lkml.kernel.org/r/20190920100835.14999-1-julien.grall@arm.com
+Reported-by: Andre Przywara <andre.przywara@arm.com>
+Signed-off-by: Julien Grall <julien.grall@arm.com>
+Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
+---
+ lib/ubsan.c | 64 +++++++++++++++++++----------------------------------
+ 1 file changed, 23 insertions(+), 41 deletions(-)
+
+diff --git a/lib/ubsan.c b/lib/ubsan.c
+index 1e9e2ab25539..5830cc9a2164 100644
+--- a/lib/ubsan.c
++++ b/lib/ubsan.c
+@@ -143,25 +143,21 @@ static void val_to_string(char *str, size_t size, struct type_descriptor *type,
+ 	}
+ }
+ 
+-static DEFINE_SPINLOCK(report_lock);
+-
+-static void ubsan_prologue(struct source_location *location,
+-			unsigned long *flags)
++static void ubsan_prologue(struct source_location *location)
+ {
+ 	current->in_ubsan++;
+-	spin_lock_irqsave(&report_lock, *flags);
+ 
+ 	pr_err("========================================"
+ 		"========================================\n");
+ 	print_source_location("UBSAN: Undefined behaviour in", location);
+ }
+ 
+-static void ubsan_epilogue(unsigned long *flags)
++static void ubsan_epilogue(void)
+ {
+ 	dump_stack();
+ 	pr_err("========================================"
+ 		"========================================\n");
+-	spin_unlock_irqrestore(&report_lock, *flags);
++
+ 	current->in_ubsan--;
+ }
+ 
+@@ -170,14 +166,13 @@ static void handle_overflow(struct overflow_data *data, void *lhs,
+ {
+ 
+ 	struct type_descriptor *type = data->type;
+-	unsigned long flags;
+ 	char lhs_val_str[VALUE_LENGTH];
+ 	char rhs_val_str[VALUE_LENGTH];
+ 
+ 	if (suppress_report(&data->location))
+ 		return;
+ 
+-	ubsan_prologue(&data->location, &flags);
++	ubsan_prologue(&data->location);
+ 
+ 	val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs);
+ 	val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs);
+@@ -189,7 +184,7 @@ static void handle_overflow(struct overflow_data *data, void *lhs,
+ 		rhs_val_str,
+ 		type->type_name);
+ 
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ }
+ 
+ void __ubsan_handle_add_overflow(struct overflow_data *data,
+@@ -217,20 +212,19 @@ EXPORT_SYMBOL(__ubsan_handle_mul_overflow);
+ void __ubsan_handle_negate_overflow(struct overflow_data *data,
+ 				void *old_val)
+ {
+-	unsigned long flags;
+ 	char old_val_str[VALUE_LENGTH];
+ 
+ 	if (suppress_report(&data->location))
+ 		return;
+ 
+-	ubsan_prologue(&data->location, &flags);
++	ubsan_prologue(&data->location);
+ 
+ 	val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val);
+ 
+ 	pr_err("negation of %s cannot be represented in type %s:\n",
+ 		old_val_str, data->type->type_name);
+ 
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ }
+ EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
+ 
+@@ -238,13 +232,12 @@ EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
+ void __ubsan_handle_divrem_overflow(struct overflow_data *data,
+ 				void *lhs, void *rhs)
+ {
+-	unsigned long flags;
+ 	char rhs_val_str[VALUE_LENGTH];
+ 
+ 	if (suppress_report(&data->location))
+ 		return;
+ 
+-	ubsan_prologue(&data->location, &flags);
++	ubsan_prologue(&data->location);
+ 
+ 	val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs);
+ 
+@@ -254,58 +247,52 @@ void __ubsan_handle_divrem_overflow(struct overflow_data *data,
+ 	else
+ 		pr_err("division by zero\n");
+ 
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ }
+ EXPORT_SYMBOL(__ubsan_handle_divrem_overflow);
+ 
+ static void handle_null_ptr_deref(struct type_mismatch_data_common *data)
+ {
+-	unsigned long flags;
+-
+ 	if (suppress_report(data->location))
+ 		return;
+ 
+-	ubsan_prologue(data->location, &flags);
++	ubsan_prologue(data->location);
+ 
+ 	pr_err("%s null pointer of type %s\n",
+ 		type_check_kinds[data->type_check_kind],
+ 		data->type->type_name);
+ 
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ }
+ 
+ static void handle_misaligned_access(struct type_mismatch_data_common *data,
+ 				unsigned long ptr)
+ {
+-	unsigned long flags;
+-
+ 	if (suppress_report(data->location))
+ 		return;
+ 
+-	ubsan_prologue(data->location, &flags);
++	ubsan_prologue(data->location);
+ 
+ 	pr_err("%s misaligned address %p for type %s\n",
+ 		type_check_kinds[data->type_check_kind],
+ 		(void *)ptr, data->type->type_name);
+ 	pr_err("which requires %ld byte alignment\n", data->alignment);
+ 
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ }
+ 
+ static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
+ 					unsigned long ptr)
+ {
+-	unsigned long flags;
+-
+ 	if (suppress_report(data->location))
+ 		return;
+ 
+-	ubsan_prologue(data->location, &flags);
++	ubsan_prologue(data->location);
+ 	pr_err("%s address %p with insufficient space\n",
+ 		type_check_kinds[data->type_check_kind],
+ 		(void *) ptr);
+ 	pr_err("for an object of type %s\n", data->type->type_name);
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ }
+ 
+ static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
+@@ -369,25 +356,23 @@ EXPORT_SYMBOL(__ubsan_handle_vla_bound_not_positive);
+ 
+ void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
+ {
+-	unsigned long flags;
+ 	char index_str[VALUE_LENGTH];
+ 
+ 	if (suppress_report(&data->location))
+ 		return;
+ 
+-	ubsan_prologue(&data->location, &flags);
++	ubsan_prologue(&data->location);
+ 
+ 	val_to_string(index_str, sizeof(index_str), data->index_type, index);
+ 	pr_err("index %s is out of range for type %s\n", index_str,
+ 		data->array_type->type_name);
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ }
+ EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
+ 
+ void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
+ 					void *lhs, void *rhs)
+ {
+-	unsigned long flags;
+ 	struct type_descriptor *rhs_type = data->rhs_type;
+ 	struct type_descriptor *lhs_type = data->lhs_type;
+ 	char rhs_str[VALUE_LENGTH];
+@@ -396,7 +381,7 @@ void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
+ 	if (suppress_report(&data->location))
+ 		return;
+ 
+-	ubsan_prologue(&data->location, &flags);
++	ubsan_prologue(&data->location);
+ 
+ 	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
+ 	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
+@@ -419,18 +404,16 @@ void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
+ 			lhs_str, rhs_str,
+ 			lhs_type->type_name);
+ 
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ }
+ EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
+ 
+ 
+ void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
+ {
+-	unsigned long flags;
+-
+-	ubsan_prologue(&data->location, &flags);
++	ubsan_prologue(&data->location);
+ 	pr_err("calling __builtin_unreachable()\n");
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ 	panic("can't return from __builtin_unreachable()");
+ }
+ EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
+@@ -438,19 +421,18 @@ EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
+ void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
+ 				void *val)
+ {
+-	unsigned long flags;
+ 	char val_str[VALUE_LENGTH];
+ 
+ 	if (suppress_report(&data->location))
+ 		return;
+ 
+-	ubsan_prologue(&data->location, &flags);
++	ubsan_prologue(&data->location);
+ 
+ 	val_to_string(val_str, sizeof(val_str), data->type, val);
+ 
+ 	pr_err("load of value %s is not a valid value for type %s\n",
+ 		val_str, data->type->type_name);
+ 
+-	ubsan_epilogue(&flags);
++	ubsan_epilogue();
+ }
+ EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);
+-- 
+2.36.1
+