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kasan: respect KASAN_BIT_REPORTED in all reporting routines

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Currently, only kasan_report() checks the KASAN_BIT_REPORTED and
KASAN_BIT_MULTI_SHOT flags.

Make other reporting routines check these flags as well.

Also add explanatory comments.

Note that the current->kasan_depth check is split out into
report_suppressed() and only called for kasan_report().

Link: https://lkml.kernel.org/r/715e346b10b398e29ba1b425299dcd79e29d58ce.1646237226.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2022-03-24 18:13:06 -07:00 committed by Linus Torvalds
parent 795b760fe7
commit c068664c97
1 changed files with 32 additions and 3 deletions
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35
mm/kasan/report.c
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@ -381,12 +381,26 @@ static void print_memory_metadata(const void *addr)
}
}
static bool report_enabled(void)
/*
* Used to suppress reports within kasan_disable/enable_current() critical
* sections, which are used for marking accesses to slab metadata.
*/
static bool report_suppressed(void)
{
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
if (current->kasan_depth)
return false;
return true;
#endif
return false;
}
/*
* Used to avoid reporting more than one KASAN bug unless kasan_multi_shot
* is enabled. Note that KASAN tests effectively enable kasan_multi_shot
* for their duration.
*/
static bool report_enabled(void)
{
if (test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags))
return true;
return !test_and_set_bit(KASAN_BIT_REPORTED, &kasan_flags);
@ -416,6 +430,14 @@ void kasan_report_invalid_free(void *ptr, unsigned long ip)
unsigned long flags;
struct kasan_report_info info;
/*
* Do not check report_suppressed(), as an invalid-free cannot be
* caused by accessing slab metadata and thus should not be
* suppressed by kasan_disable/enable_current() critical sections.
*/
if (unlikely(!report_enabled()))
return;
start_report(&flags, true);
info.type = KASAN_REPORT_INVALID_FREE;
@ -444,7 +466,7 @@ bool kasan_report(unsigned long addr, size_t size, bool is_write,
unsigned long irq_flags;
struct kasan_report_info info;
if (unlikely(!report_enabled())) {
if (unlikely(report_suppressed()) || unlikely(!report_enabled())) {
ret = false;
goto out;
}
@ -473,6 +495,13 @@ void kasan_report_async(void)
{
unsigned long flags;
/*
* Do not check report_suppressed(), as kasan_disable/enable_current()
* critical sections do not affect Hardware Tag-Based KASAN.
*/
if (unlikely(!report_enabled()))
return;
start_report(&flags, false);
pr_err("BUG: KASAN: invalid-access\n");
pr_err("Asynchronous fault: no details available\n");