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Wed, 19 Oct 2022 15:48:10 +0000 (GMT) Received: from tarunpc.ibmuc.com (unknown [9.43.20.142]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 19 Oct 2022 15:48:10 +0000 (GMT) From: Tarun Sahu To: ltp@lists.linux.it Date: Wed, 19 Oct 2022 21:17:54 +0530 Message-Id: <20221019154754.75624-4-tsahu@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221019154754.75624-1-tsahu@linux.ibm.com> References: <20221019154754.75624-1-tsahu@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: P0dMDJ1v674Kqjfeimrr52yeSdQ_pAWy X-Proofpoint-GUID: P0dMDJ1v674Kqjfeimrr52yeSdQ_pAWy X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-19_09,2022-10-19_04,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 mlxscore=0 adultscore=0 impostorscore=0 mlxlogscore=843 spamscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210190087 X-Virus-Scanned: clamav-milter 0.102.4 at in-3.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH 3/3] Hugetlb: Migrating libhugetlbfs corrupt-by-cow-opt 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: , Cc: aneesh.kumar@linux.ibm.com, sbhat@linux.ibm.com, vaibhav@linux.ibm.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Migrating the libhugetlbfs/testcases/corrupt-by-cow-opt.c test Test Description: Test sanity of cow optimization on page cache. If a page in page cache has only 1 ref count, it is mapped for a private mapping directly and is overwritten freely, so next time we access the page, we can see corrupt data. Signed-off-by: Tarun Sahu --- runtest/hugetlb | 1 + testcases/kernel/mem/.gitignore | 1 + .../kernel/mem/hugetlb/hugemmap/hugemmap09.c | 90 +++++++++++++++++++ 3 files changed, 92 insertions(+) create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap09.c diff --git a/runtest/hugetlb b/runtest/hugetlb index 664f18827..e2ada7a97 100644 --- a/runtest/hugetlb +++ b/runtest/hugetlb @@ -5,6 +5,7 @@ hugemmap05 hugemmap05 hugemmap06 hugemmap06 hugemmap07 hugemmap07 hugemmap08 hugemmap08 +hugemmap09 hugemmap09 hugemmap05_1 hugemmap05 -m hugemmap05_2 hugemmap05 -s hugemmap05_3 hugemmap05 -s -m diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore index 003ce422b..1a242ffe0 100644 --- a/testcases/kernel/mem/.gitignore +++ b/testcases/kernel/mem/.gitignore @@ -6,6 +6,7 @@ /hugetlb/hugemmap/hugemmap06 /hugetlb/hugemmap/hugemmap07 /hugetlb/hugemmap/hugemmap08 +/hugetlb/hugemmap/hugemmap09 /hugetlb/hugeshmat/hugeshmat01 /hugetlb/hugeshmat/hugeshmat02 /hugetlb/hugeshmat/hugeshmat03 diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap09.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap09.c new file mode 100644 index 000000000..067556793 --- /dev/null +++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap09.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: LGPL-2.1-or-later +/* + * Copyright (C) 2013 Joonsoo Kim, LG Electronics. + * Author: Joonsoo Kim + */ + +/*\ + * [Description] + * + * Corrupt by COW optimization: + * Test sanity of cow optimization on page cache. If a page in page cache + * has only 1 ref count, it is mapped for a private mapping directly and + * is overwritten freely, so next time we access the page, we can see + * corrupt data. + * + */ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include + +#include "hugetlb.h" + +static int fd = -1; +static char hfile[MAXPATHLEN]; +static long hpage_size; + +static void run_test(void) +{ + char *p; + char c; + + p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); + *p = 's'; + tst_res(TINFO, "Write %c to %p via shared mapping", *p, p); + SAFE_MUNMAP(p, hpage_size); + + p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); + *p = 'p'; + tst_res(TINFO, "Write %c to %p via private mapping", *p, p); + SAFE_MUNMAP(p, hpage_size); + + p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); + c = *p; + tst_res(TINFO, "Read %c from %p via shared mapping", *p, p); + SAFE_MUNMAP(p, hpage_size); + + /* Direct write from huge page */ + if (c != 's') + tst_res(TFAIL, "Data got corrupted."); + else + tst_res(TPASS, "Successful"); +} + +static void setup(void) +{ + if (!Hopt) + Hopt = tst_get_tmpdir(); + SAFE_MOUNT("none", Hopt, "hugetlbfs", 0, NULL); + + snprintf(hfile, sizeof(hfile), "%s/ltp_hugetlbfile%d", Hopt, getpid()); + hpage_size = SAFE_READ_MEMINFO("Hugepagesize:")*1024; + + fd = SAFE_OPEN(hfile, O_RDWR | O_CREAT, 0600); + SAFE_UNLINK(hfile); +} + +static void cleanup(void) +{ + if (fd >= 0) + SAFE_CLOSE(fd); + SAFE_UMOUNT(Hopt); +} + +static struct tst_test test = { + .needs_root = 1, + .needs_tmpdir = 1, + .options = (struct tst_option[]) { + {"H:", &Hopt, "Location of hugetlbfs, i.e. -H /var/hugetlbfs"}, + {"s:", &nr_opt, "Set the number of the been allocated hugepages"}, + {} + }, + .setup = setup, + .cleanup = cleanup, + .test_all = run_test, + .hugepages = {2, TST_NEEDS}, +}; -- 2.31.1 -- Mailing list info: https://lists.linux.it/listinfo/ltp