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kcsan: Enable context analysis

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Enable context analysis for the KCSAN subsystem.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251219154418.3592607-31-elver@google.com
This commit is contained in:
Marco Elver 2025-12-19 16:40:19 +01:00 • committed by Peter Zijlstra
parent 6556fde265
commit 0eaa911f89
2 changed files with 10 additions and 3 deletions
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2
kernel/kcsan/Makefile
View file

@ -1,4 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
CONTEXT_ANALYSIS := y
KCSAN_SANITIZE := n
KCOV_INSTRUMENT := n
UBSAN_SANITIZE := n

11
kernel/kcsan/report.c
View file

@ -116,6 +116,7 @@ static DEFINE_RAW_SPINLOCK(report_lock);
* been reported since (now - KCSAN_REPORT_ONCE_IN_MS).
*/
static bool rate_limit_report(unsigned long frame1, unsigned long frame2)
__must_hold(&report_lock)
{
struct report_time *use_entry = &report_times[0];
unsigned long invalid_before;
@ -366,6 +367,7 @@ static int sym_strcmp(void *addr1, void *addr2)
static void
print_stack_trace(unsigned long stack_entries[], int num_entries, unsigned long reordered_to)
__must_hold(&report_lock)
{
stack_trace_print(stack_entries, num_entries, 0);
if (reordered_to)
@ -373,6 +375,7 @@ print_stack_trace(unsigned long stack_entries[], int num_entries, unsigned long
}
static void print_verbose_info(struct task_struct *task)
__must_hold(&report_lock)
{
if (!task)
return;
@ -389,6 +392,7 @@ static void print_report(enum kcsan_value_change value_change,
const struct access_info *ai,
struct other_info *other_info,
u64 old, u64 new, u64 mask)
__must_hold(&report_lock)
{
unsigned long reordered_to = 0;
unsigned long stack_entries[NUM_STACK_ENTRIES] = { 0 };
@ -496,6 +500,7 @@ static void print_report(enum kcsan_value_change value_change,
}
static void release_report(unsigned long *flags, struct other_info *other_info)
__releases(&report_lock)
{
/*
* Use size to denote valid/invalid, since KCSAN entirely ignores
@ -507,13 +512,11 @@ static void release_report(unsigned long *flags, struct other_info *other_info)
/*
* Sets @other_info->task and awaits consumption of @other_info.
*
* Precondition: report_lock is held.
* Postcondition: report_lock is held.
*/
static void set_other_info_task_blocking(unsigned long *flags,
const struct access_info *ai,
struct other_info *other_info)
__must_hold(&report_lock)
{
/*
* We may be instrumenting a code-path where current->state is already
@ -572,6 +575,7 @@ static void set_other_info_task_blocking(unsigned long *flags,
static void prepare_report_producer(unsigned long *flags,
const struct access_info *ai,
struct other_info *other_info)
__must_not_hold(&report_lock)
{
raw_spin_lock_irqsave(&report_lock, *flags);
@ -603,6 +607,7 @@ static void prepare_report_producer(unsigned long *flags,
static bool prepare_report_consumer(unsigned long *flags,
const struct access_info *ai,
struct other_info *other_info)
__cond_acquires(true, &report_lock)
{
raw_spin_lock_irqsave(&report_lock, *flags);