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kcsan: Add kcsan_set_access_mask() support

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When setting up an access mask with kcsan_set_access_mask(), KCSAN will
only report races if concurrent changes to bits set in access_mask are
observed. Conveying access_mask via a separate call avoids introducing
overhead in the common-case fast-path.

Acked-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Marco Elver
2020-02-11 17:04:22 +01:00
committed by Ingo Molnar
parent b738f6169f
commit 81af89e158
6 changed files with 73 additions and 5 deletions
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13
kernel/kcsan/report.c
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@@ -132,6 +132,9 @@ static bool rate_limit_report(unsigned long frame1, unsigned long frame2)
static bool
skip_report(enum kcsan_value_change value_change, unsigned long top_frame)
{
/* Should never get here if value_change==FALSE. */
WARN_ON_ONCE(value_change == KCSAN_VALUE_CHANGE_FALSE);
/*
* The first call to skip_report always has value_change==TRUE, since we
* cannot know the value written of an instrumented access. For the 2nd
@@ -493,7 +496,15 @@ void kcsan_report(const volatile void *ptr, size_t size, int access_type,
kcsan_disable_current();
if (prepare_report(&flags, ptr, size, access_type, cpu_id, type)) {
if (print_report(ptr, size, access_type, value_change, cpu_id, type) && panic_on_warn)
/*
* Never report if value_change is FALSE, only if we it is
* either TRUE or MAYBE. In case of MAYBE, further filtering may
* be done once we know the full stack trace in print_report().
*/
bool reported = value_change != KCSAN_VALUE_CHANGE_FALSE &&
print_report(ptr, size, access_type, value_change, cpu_id, type);
if (reported && panic_on_warn)
panic("panic_on_warn set ...\n");
release_report(&flags, type);