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kunit: memcpy: Split slow memcpy tests into MEMCPY_SLOW_KUNIT_TEST 

Since the long memcpy tests may stall a system for tens of seconds
in virtualized architecture environments, split those tests off under
CONFIG_MEMCPY_SLOW_KUNIT_TEST so they can be separately disabled.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/lkml/20221226195206.GA2626419@roeck-us.net
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-and-tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: David Gow <davidgow@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2023-01-06 19:47:05 -08:00
parent 42633ed852
commit 4acf1de35f
2 changed files with 11 additions and 0 deletions
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9
lib/Kconfig.debug
View File

@ -2566,6 +2566,15 @@ config MEMCPY_KUNIT_TEST
If unsure, say N.
config MEMCPY_SLOW_KUNIT_TEST
bool "Include exhaustive memcpy tests"
depends on MEMCPY_KUNIT_TEST
default y
help
Some memcpy tests are quite exhaustive in checking for overlaps
and bit ranges. These can be very slow, so they are split out
as a separate config, in case they need to be disabled.
config IS_SIGNED_TYPE_KUNIT_TEST
tristate "Test is_signed_type() macro" if !KUNIT_ALL_TESTS
depends on KUNIT

2
lib/memcpy_kunit.c
View File

@ -309,6 +309,8 @@ static void set_random_nonzero(struct kunit *test, u8 *byte)
static void init_large(struct kunit *test)
{
if (!IS_ENABLED(CONFIG_MEMCPY_SLOW_KUNIT_TEST))
kunit_skip(test, "Slow test skipped. Enable with CONFIG_MEMCPY_SLOW_KUNIT_TEST=y");
/* Get many bit patterns. */
get_random_bytes(large_src, ARRAY_SIZE(large_src));