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Thu, 1 Dec 2022 12:28:59 +0000 (GMT) From: Tarun Sahu To: ltp@lists.linux.it Date: Thu, 1 Dec 2022 17:58:42 +0530 Message-Id: <20221201122844.142062-7-tsahu@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221201122844.142062-1-tsahu@linux.ibm.com> References: <20221201122844.142062-1-tsahu@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: YjUtzlMoS1PxTaSuNz6XwA068_aJkZfP X-Proofpoint-ORIG-GUID: YjUtzlMoS1PxTaSuNz6XwA068_aJkZfP X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-01_04,2022-12-01_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxscore=0 spamscore=0 suspectscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 malwarescore=0 mlxlogscore=962 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212010086 X-Virus-Scanned: clamav-milter 0.102.4 at in-6.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH 6/8] Hugetlb: Migrating libhugetlbfs map_high_truncate_2 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: geetika@linux.ibm.com, sbhat@linux.ibm.com, aneesh.kumar@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/map_high_truncate_2.c test Test Description: At one stage, a misconversion of hugetlb_vmtruncate_list to a prio_tree meant that on 32-bit machines, certain combinations of mapping and truncations could truncate incorrect pages, or overwrite pmds from other VMAs, triggering BUG_ON()s or other wierdness. Test adapted from an example by Kenneth Chen WARNING: The offsets and addresses used within are specifically calculated to trigger the bug as it existed. Don't mess with them unless you *really* know what you're doing. The kernel bug in question was fixed with 'commit 856fc2950555 ("[PATCH] hugetlb: fix prio_tree unit")'. Signed-off-by: Tarun Sahu --- runtest/hugetlb | 1 + testcases/kernel/mem/.gitignore | 1 + .../kernel/mem/hugetlb/hugemmap/hugemmap17.c | 103 ++++++++++++++++++ 3 files changed, 105 insertions(+) create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap17.c diff --git a/runtest/hugetlb b/runtest/hugetlb index 1691ce37d..5fac3481c 100644 --- a/runtest/hugetlb +++ b/runtest/hugetlb @@ -18,6 +18,7 @@ hugemmap13 hugemmap13 hugemmap14 hugemmap14 hugemmap15 hugemmap15 hugemmap16 hugemmap16 +hugemmap17 hugemmap17 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 eb8e87c40..6aa54f902 100644 --- a/testcases/kernel/mem/.gitignore +++ b/testcases/kernel/mem/.gitignore @@ -17,6 +17,7 @@ /hugetlb/hugemmap/hugemmap14 /hugetlb/hugemmap/hugemmap15 /hugetlb/hugemmap/hugemmap16 +/hugetlb/hugemmap/hugemmap17 /hugetlb/hugeshmat/hugeshmat01 /hugetlb/hugeshmat/hugeshmat02 /hugetlb/hugeshmat/hugeshmat03 diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap17.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap17.c new file mode 100644 index 000000000..1815765d2 --- /dev/null +++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap17.c @@ -0,0 +1,103 @@ +// SPDX-License-Identifier: LGPL-2.1-or-later +/* + * Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation. + * Author: David Gibson & Adam Litke + */ + +/*\ + * [Descriptiom] + * + * At one stage, a misconversion of hugetlb_vmtruncate_list to a prio_tree + * meant that on 32-bit machines, certain combinations of mapping and + * truncations could truncate incorrect pages, or overwrite pmds from + * other VMAs, triggering BUG_ON()s or other wierdness. + * + * Test adapted from an example by Kenneth Chen + * + * WARNING: The offsets and addresses used within are specifically + * calculated to trigger the bug as it existed. Don't mess with them + * unless you *really* know what you're doing. + * + * The kernel bug in question was fixed with commit + * 856fc29505556cf263f3dcda2533cf3766c14ab6. + */ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include + +#include "hugetlb.h" + +#define MNTPOINT "hugetlbfs/" +#define MAP_LENGTH (4UL * hpage_size) +#if defined(__s390__) && __WORDSIZE == 32 +#define TRUNCATE_POINT 0x20000000UL +#else +#define TRUNCATE_POINT 0x60000000UL +#endif +#define HIGH_ADDR 0xa0000000UL +#define FOURGIG ((off64_t)0x100000000ULL) + +static unsigned long hpage_size; +static int fd = -1; + +static void run_test(void) +{ + char *p, *q; + unsigned long i; + + p = SAFE_MMAP(0, MAP_LENGTH + TRUNCATE_POINT, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_NORESERVE, fd, 0); + + SAFE_MUNMAP(p, MAP_LENGTH + TRUNCATE_POINT); + + q = SAFE_MMAP((void *)HIGH_ADDR, MAP_LENGTH, PROT_READ | PROT_WRITE, + MAP_PRIVATE, fd, 0); + tst_res(TINFO, "High map at %p", q); + + for (i = 0; i < MAP_LENGTH; i += hpage_size) + q[i] = 1; + + SAFE_FTRUNCATE(fd, TRUNCATE_POINT); + + if (q[0] != 1) + tst_res(TFAIL, "data mismatch"); + else + tst_res(TPASS, "Successful"); + + SAFE_MUNMAP(q, MAP_LENGTH); +} + +static void setup(void) +{ + hpage_size = SAFE_READ_MEMINFO("Hugepagesize:")*1024; + + if (hpage_size > TRUNCATE_POINT) + tst_brk(TCONF, "Huge page size is too large"); + if (TRUNCATE_POINT % hpage_size) + tst_brk(TCONF, "Truncation point is not aligned to huge page size"); + fd = tst_creat_unlinked(MNTPOINT, 0); +} + +static void cleanup(void) +{ + if (fd >= 0) + SAFE_CLOSE(fd); +} + +static struct tst_test test = { + .tags = (struct tst_tag[]) { + {"linux-git", "856fc2950555"}, + {} + }, + .needs_root = 1, + .mntpoint = MNTPOINT, + .needs_hugetlbfs = 1, + .setup = setup, + .cleanup = cleanup, + .test_all = run_test, + .hugepages = {4, TST_NEEDS}, +}; -- 2.31.1 -- Mailing list info: https://lists.linux.it/listinfo/ltp