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Sat, 26 Sep 2026 06:43:40 -0700 (PDT) From: Danish Khateeb To: Willy Tarreau , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= Cc: Shuah Khan , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Danish Khateeb Subject: [PATCH 2/2] selftests/nolibc: test malloc() and calloc() with huge sizes Date: Sat, 26 Sep 2026 08:43:32 -0500 Message-ID: <20260926134332.58184-3-danishkhateeb03@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260926134332.58184-1-danishkhateeb03@gmail.com> References: <20260926134332.58184-1-danishkhateeb03@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit test_malloc() only allocates a few pages, so nothing noticed that malloc() and calloc() went wrong for sizes close to SIZE_MAX. Check that malloc(SIZE_MAX), malloc(SIZE_MAX - 4096) and calloc(SIZE_MAX, 1) fail with ENOMEM. The sizes are hidden from the compiler, as GCC warns about such large constant allocations when building against glibc. Assisted-by: LLM Signed-off-by: Danish Khateeb --- tools/testing/selftests/nolibc/nolibc-test.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 1995d67dcca6..0bb5116763bc 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -1915,6 +1915,14 @@ int test_malloc(void) return 0; } +/* Hide a size from the compiler, which warns about huge constant allocations */ +static size_t hide_size(size_t size) +{ + __asm__ ("" : "+r" (size)); + + return size; +} + int run_stdlib(int min, int max) { int test; @@ -2050,6 +2058,9 @@ int run_stdlib(int min, int max) CASE_TEST(major_big); EXPECT_EQ(1, major(0x1122355667734488), 0x11223344); break; CASE_TEST(minor_big); EXPECT_EQ(1, minor(0x1122355667734488), 0x55667788); break; CASE_TEST(malloc); EXPECT_ZR(1, test_malloc()); break; + CASE_TEST(malloc_max); EXPECT_PTRER(1, malloc(hide_size(SIZE_MAX)), NULL, ENOMEM); break; + CASE_TEST(malloc_max_page); EXPECT_PTRER(1, malloc(hide_size(SIZE_MAX - 4096)), NULL, ENOMEM); break; + CASE_TEST(calloc_max); EXPECT_PTRER(1, calloc(hide_size(SIZE_MAX), 1), NULL, ENOMEM); break; CASE_TEST(bswap_16); EXPECT_EQ(1, bswap_16(0x0123), 0x2301); break; CASE_TEST(bswap_32); EXPECT_EQ(1, bswap_32(0x01234567), 0x67452301); break; CASE_TEST(bswap_64); EXPECT_EQ(1, bswap_64(0x0123456789abcdef), 0xefcdab8967452301); break; -- 2.55.0