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kasan: speed up match_all_mem_tag test for SW_TAGS 

Checking all 256 possible tag values in the match_all_mem_tag KASAN test
is slow and produces 256 reports.  Instead, just check the first 8 and the
last 8.

Link: https://lkml.kernel.org/r/6fe51262defd80cdc1150c42404977aafd1b6167.1703188911.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>
This commit is contained in:
Andrey Konovalov 2023-12-21 21:04:53 +01:00 committed by Andrew Morton
parent 3ab9304db6
commit 4e397274e1
1 changed files with 8 additions and 0 deletions
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8
mm/kasan/kasan_test.c
View File

@ -1797,6 +1797,14 @@ static void match_all_mem_tag(struct kunit *test)
/* For each possible tag value not matching the pointer tag. */
for (tag = KASAN_TAG_MIN; tag <= KASAN_TAG_KERNEL; tag++) {
/*
* For Software Tag-Based KASAN, skip the majority of tag
* values to avoid the test printing too many reports.
*/
if (IS_ENABLED(CONFIG_KASAN_SW_TAGS) &&
tag >= KASAN_TAG_MIN + 8 && tag <= KASAN_TAG_KERNEL - 8)
continue;
if (tag == get_tag(ptr))
continue;