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Thu, 1 Dec 2022 12:29:04 +0000 (GMT) From: Tarun Sahu To: ltp@lists.linux.it Date: Thu, 1 Dec 2022 17:58:44 +0530 Message-Id: <20221201122844.142062-9-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: xD3_q8x8hmlllIFU-l8Nh1uOvUSa2LdL X-Proofpoint-ORIG-GUID: xD3_q8x8hmlllIFU-l8Nh1uOvUSa2LdL 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 adultscore=0 malwarescore=0 bulkscore=0 phishscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 lowpriorityscore=0 clxscore=1015 spamscore=0 suspectscore=0 mlxscore=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-5.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH 8/8] Hugetlb: Migrating libhugetlbfs misaligned_offset 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/misaligned_offset.c test Test Name: Misaligned offset Test Description: At one stage, a misconversion of hugetlb_vmtruncate_list to a prio_tree meant that on 32-bit machines, truncates at or above 4GB could truncate lower pages, resulting in BUG_ON()s. 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/hugemmap19.c | 147 ++++++++++++++++++ 3 files changed, 149 insertions(+) create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap19.c diff --git a/runtest/hugetlb b/runtest/hugetlb index de76cdaf2..4da1525a7 100644 --- a/runtest/hugetlb +++ b/runtest/hugetlb @@ -20,6 +20,7 @@ hugemmap15 hugemmap15 hugemmap16 hugemmap16 hugemmap17 hugemmap17 hugemmap18 hugemmap18 +hugemmap19 hugemmap19 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 daee70586..b6b3e5ddd 100644 --- a/testcases/kernel/mem/.gitignore +++ b/testcases/kernel/mem/.gitignore @@ -19,6 +19,7 @@ /hugetlb/hugemmap/hugemmap16 /hugetlb/hugemmap/hugemmap17 /hugetlb/hugemmap/hugemmap18 +/hugetlb/hugemmap/hugemmap19 /hugetlb/hugeshmat/hugeshmat01 /hugetlb/hugeshmat/hugeshmat02 /hugetlb/hugeshmat/hugeshmat03 diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap19.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap19.c new file mode 100644 index 000000000..c5b29a701 --- /dev/null +++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap19.c @@ -0,0 +1,147 @@ +// SPDX-License-Identifier: LGPL-2.1-or-later +/* + * Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation. + * Copyright (C) 2006 Hugh Dickins + * Author: David Gibson & Adam Litke + */ + +/*\ + * [Descripiton] + * + * At one stage, a misconversion of hugetlb_vmtruncate_list to a + * prio_tree meant that on 32-bit machines, truncates at or above 4GB + * could truncate lower pages, resulting in BUG_ON()s. + * + * 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 RANDOM_CONSTANT 0x1234ABCD +#define MNTPOINT "hugetlbfs/" +static int page_size; +static long hpage_size; +static int fd = -1; + +static void run_test(void) +{ + off_t buggy_offset; + void *p, *q; + volatile int *pi; + int err; + + /* + * First, we make a 2 page sane hugepage mapping. Then we + * memset() it to ensure that the ptes are instantiated for + * it. Then we attempt to replace the second half of the map + * with one at a bogus offset. We leave the first page of + * sane mapping in place to ensure that the corresponding + * pud/pmd/whatever entries aren't cleaned away. It's those + * bad entries which can trigger bad_pud() checks if the + * backout path for the bogus mapping is buggy, which it was + * in some kernels. + */ + tst_res(TINFO, "Initial free hugepages: %lu", + SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE)); + + /* First get arena of three hpages size, at file offset 4GB */ + p = SAFE_MMAP(NULL, 2*hpage_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); + + tst_res(TINFO, "After Mapping reference map, Free hugepages: %lu", + SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE)); + tst_res(TINFO, "Mapped Address Range: %p-%p", p, p+2*hpage_size-1); + + memset(p, 0, 2*hpage_size); + pi = p; + *pi = RANDOM_CONSTANT; + + tst_res(TINFO, "After instantiate the pages, Free hugepages: %lu", + SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE)); + + /* + * Toggle the permissions on the first page. This forces TLB + * entries (including hash page table on powerpc) to be + * flushed, so that the page tables must be accessed for the + * test further down. In the buggy case, those page tables + * can get thrown away by a pud_clear() + */ + err = mprotect(p, hpage_size, PROT_READ); + if (err) + tst_brk(TBROK|TERRNO, "mprotect(%p, 0x%lx, PROT_READ)", p, hpage_size); + + /* Replace top hpage by hpage mapping at confusing file offset */ + buggy_offset = page_size; + tst_res(TINFO, "Replacing map at %p with map from offset 0x%lx...", + p + hpage_size, (unsigned long)buggy_offset); + q = mmap(p + hpage_size, hpage_size, PROT_READ|PROT_WRITE, + MAP_FIXED|MAP_PRIVATE, fd, buggy_offset); + if (q != MAP_FAILED) { + tst_res(TFAIL|TERRNO, "bogus offset mmap() succeeded at %p", q); + goto cleanup; + } + if (errno != EINVAL) { + tst_res(TFAIL|TERRNO, "bogus mmap() failed should be \"%s\" but it is", + tst_strerrno(EINVAL)); + goto cleanup; + } + + tst_res(TINFO, "After Mapping with buggy offset, Free hugepages: %lu", + SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE)); + + if (*pi != RANDOM_CONSTANT) { + tst_res(TFAIL, "Pre-existing mapping clobbered: %x instead of %x", + *pi, RANDOM_CONSTANT); + goto cleanup; + } + + /* + * The real test is whether we got a bad_pud() or similar + * during the run. The check above, combined with the earlier + * mprotect()s to flush the TLB are supposed to catch it, but + * it's hard to be certain. Once bad_pud() is called + * behaviour can be very strange. + */ + + tst_res(TPASS, "Successful but inconclusive"); +cleanup: + SAFE_MUNMAP(p, 2*hpage_size); +} + +static void setup(void) +{ + page_size = getpagesize(); + hpage_size = SAFE_READ_MEMINFO("Hugepagesize:")*1024; + 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