mirror of
https://github.com/torvalds/linux.git
synced 2024-11-26 22:21:42 +00:00
55a55fec50
Add the ability to pass an explicitly set instruction pointer of access from check_access() all the way through to reporting. In preparation of using it in reporting. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* The Kernel Concurrency Sanitizer (KCSAN) infrastructure. For more info please
|
|
* see Documentation/dev-tools/kcsan.rst.
|
|
*
|
|
* Copyright (C) 2019, Google LLC.
|
|
*/
|
|
|
|
#ifndef _KERNEL_KCSAN_KCSAN_H
|
|
#define _KERNEL_KCSAN_KCSAN_H
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/kcsan.h>
|
|
#include <linux/sched.h>
|
|
|
|
/* The number of adjacent watchpoints to check. */
|
|
#define KCSAN_CHECK_ADJACENT 1
|
|
#define NUM_SLOTS (1 + 2*KCSAN_CHECK_ADJACENT)
|
|
|
|
extern unsigned int kcsan_udelay_task;
|
|
extern unsigned int kcsan_udelay_interrupt;
|
|
|
|
/*
|
|
* Globally enable and disable KCSAN.
|
|
*/
|
|
extern bool kcsan_enabled;
|
|
|
|
/*
|
|
* Save/restore IRQ flags state trace dirtied by KCSAN.
|
|
*/
|
|
void kcsan_save_irqtrace(struct task_struct *task);
|
|
void kcsan_restore_irqtrace(struct task_struct *task);
|
|
|
|
/*
|
|
* Statistics counters displayed via debugfs; should only be modified in
|
|
* slow-paths.
|
|
*/
|
|
enum kcsan_counter_id {
|
|
/*
|
|
* Number of watchpoints currently in use.
|
|
*/
|
|
KCSAN_COUNTER_USED_WATCHPOINTS,
|
|
|
|
/*
|
|
* Total number of watchpoints set up.
|
|
*/
|
|
KCSAN_COUNTER_SETUP_WATCHPOINTS,
|
|
|
|
/*
|
|
* Total number of data races.
|
|
*/
|
|
KCSAN_COUNTER_DATA_RACES,
|
|
|
|
/*
|
|
* Total number of ASSERT failures due to races. If the observed race is
|
|
* due to two conflicting ASSERT type accesses, then both will be
|
|
* counted.
|
|
*/
|
|
KCSAN_COUNTER_ASSERT_FAILURES,
|
|
|
|
/*
|
|
* Number of times no watchpoints were available.
|
|
*/
|
|
KCSAN_COUNTER_NO_CAPACITY,
|
|
|
|
/*
|
|
* A thread checking a watchpoint raced with another checking thread;
|
|
* only one will be reported.
|
|
*/
|
|
KCSAN_COUNTER_REPORT_RACES,
|
|
|
|
/*
|
|
* Observed data value change, but writer thread unknown.
|
|
*/
|
|
KCSAN_COUNTER_RACES_UNKNOWN_ORIGIN,
|
|
|
|
/*
|
|
* The access cannot be encoded to a valid watchpoint.
|
|
*/
|
|
KCSAN_COUNTER_UNENCODABLE_ACCESSES,
|
|
|
|
/*
|
|
* Watchpoint encoding caused a watchpoint to fire on mismatching
|
|
* accesses.
|
|
*/
|
|
KCSAN_COUNTER_ENCODING_FALSE_POSITIVES,
|
|
|
|
KCSAN_COUNTER_COUNT, /* number of counters */
|
|
};
|
|
extern atomic_long_t kcsan_counters[KCSAN_COUNTER_COUNT];
|
|
|
|
/*
|
|
* Returns true if data races in the function symbol that maps to func_addr
|
|
* (offsets are ignored) should *not* be reported.
|
|
*/
|
|
extern bool kcsan_skip_report_debugfs(unsigned long func_addr);
|
|
|
|
/*
|
|
* Value-change states.
|
|
*/
|
|
enum kcsan_value_change {
|
|
/*
|
|
* Did not observe a value-change, however, it is valid to report the
|
|
* race, depending on preferences.
|
|
*/
|
|
KCSAN_VALUE_CHANGE_MAYBE,
|
|
|
|
/*
|
|
* Did not observe a value-change, and it is invalid to report the race.
|
|
*/
|
|
KCSAN_VALUE_CHANGE_FALSE,
|
|
|
|
/*
|
|
* The value was observed to change, and the race should be reported.
|
|
*/
|
|
KCSAN_VALUE_CHANGE_TRUE,
|
|
};
|
|
|
|
/*
|
|
* The calling thread hit and consumed a watchpoint: set the access information
|
|
* to be consumed by the reporting thread. No report is printed yet.
|
|
*/
|
|
void kcsan_report_set_info(const volatile void *ptr, size_t size, int access_type,
|
|
unsigned long ip, int watchpoint_idx);
|
|
|
|
/*
|
|
* The calling thread observed that the watchpoint it set up was hit and
|
|
* consumed: print the full report based on information set by the racing
|
|
* thread.
|
|
*/
|
|
void kcsan_report_known_origin(const volatile void *ptr, size_t size, int access_type,
|
|
unsigned long ip, enum kcsan_value_change value_change,
|
|
int watchpoint_idx, u64 old, u64 new, u64 mask);
|
|
|
|
/*
|
|
* No other thread was observed to race with the access, but the data value
|
|
* before and after the stall differs. Reports a race of "unknown origin".
|
|
*/
|
|
void kcsan_report_unknown_origin(const volatile void *ptr, size_t size, int access_type,
|
|
unsigned long ip, u64 old, u64 new, u64 mask);
|
|
|
|
#endif /* _KERNEL_KCSAN_KCSAN_H */
|