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Sat, 28 Dec 2024 05:32:23 -0800 (PST) Received: from localhost ([202.127.77.110]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aac0f014538sm1258403066b.146.2024.12.28.05.32.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Dec 2024 05:32:23 -0800 (PST) To: ltp@lists.linux.it Date: Sat, 28 Dec 2024 08:32:17 -0500 Message-Id: <20241228133217.28945-1-wegao@suse.com> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 1.0.3 at in-2.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH v1] mmap21.c: Test for new MAP_DROPPABLE flag for mmap X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Wei Gao via ltp Reply-To: Wei Gao Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Signed-off-by: Wei Gao --- include/lapi/mmap.h | 4 ++ runtest/syscalls | 1 + testcases/kernel/syscalls/mmap/.gitignore | 1 + testcases/kernel/syscalls/mmap/mmap21.c | 73 +++++++++++++++++++++++ 4 files changed, 79 insertions(+) create mode 100644 testcases/kernel/syscalls/mmap/mmap21.c diff --git a/include/lapi/mmap.h b/include/lapi/mmap.h index ea9730586..248b64564 100644 --- a/include/lapi/mmap.h +++ b/include/lapi/mmap.h @@ -87,6 +87,10 @@ # define MADV_PAGEOUT 21 #endif +#ifndef MAP_DROPPABLE +# define MAP_DROPPABLE 0x08 +#endif + #ifndef MAP_FIXED_NOREPLACE #ifdef __alpha__ diff --git a/runtest/syscalls b/runtest/syscalls index ded035ee8..7166e39a4 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -840,6 +840,7 @@ mmap17 mmap17 mmap18 mmap18 mmap19 mmap19 mmap20 mmap20 +mmap21 mmap21 modify_ldt01 modify_ldt01 modify_ldt02 modify_ldt02 diff --git a/testcases/kernel/syscalls/mmap/.gitignore b/testcases/kernel/syscalls/mmap/.gitignore index 4591fdbb9..87b23aaee 100644 --- a/testcases/kernel/syscalls/mmap/.gitignore +++ b/testcases/kernel/syscalls/mmap/.gitignore @@ -18,3 +18,4 @@ /mmap18 /mmap19 /mmap20 +/mmap21 diff --git a/testcases/kernel/syscalls/mmap/mmap21.c b/testcases/kernel/syscalls/mmap/mmap21.c new file mode 100644 index 000000000..e2b8c4551 --- /dev/null +++ b/testcases/kernel/syscalls/mmap/mmap21.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2024 Wei Gao + */ + +/*\ + * [Description] + * + * Test mmap(2) with MAP_DROPPABLE flag. + * + * Test base on kernel selftests/mm/droppable.c + */ + +#include +#include +#include +#include "tst_test.h" +#include "lapi/mmap.h" + +static void test_mmap(void) +{ + size_t alloc_size = 134217728; + size_t page_size = getpagesize(); + void *alloc; + pid_t child; + + alloc = SAFE_MMAP(0, alloc_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0); + + memset(alloc, 'A', alloc_size); + for (size_t i = 0; i < alloc_size; i += page_size) { + if (*(char *)(alloc + i) != 'A') + tst_res(TFAIL, "memset failed"); + } + + int *shared_var = SAFE_MMAP(NULL, sizeof(int), PROT_READ | PROT_WRITE, + MAP_SHARED | MAP_ANONYMOUS, -1, 0); + + *shared_var = 0; + + child = SAFE_FORK(); + if (!child) { + for (;;) { + *(char *)malloc(page_size) = 'B'; + if ((*shared_var) == 1) + exit(0); + } + } + + for (; !(*shared_var);) { + for (size_t i = 0; i < alloc_size; i += page_size) { + if (!*(uint8_t *)(alloc + i)) { + *shared_var = 1; + break; + } + } + } + + TST_EXP_EQ_LI((*shared_var), 1); + + SAFE_WAITPID(child, NULL, 0); + + SAFE_MUNMAP(alloc, alloc_size); + SAFE_MUNMAP(shared_var, sizeof(int)); +} + +static struct tst_test test = { + .min_kver = "6.11", + .test_all = test_mmap, + .needs_tmpdir = 1, + .forks_child = 1, + .max_runtime = 180, +}; 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