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GET /api/1.2/patches/2226025/?format=api
{ "id": 2226025, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2226025/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ltp/patch/20260422023115.27534-1-wegao@suse.com/", "project": { "id": 59, "url": "http://patchwork.ozlabs.org/api/1.2/projects/59/?format=api", "name": "Linux Test Project development", "link_name": "ltp", "list_id": "ltp.lists.linux.it", "list_email": "ltp@lists.linux.it", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260422023115.27534-1-wegao@suse.com>", "list_archive_url": null, "date": "2026-04-22T02:30:59", "name": "[v9] mremap07.c: New test for mremap() with MREMAP_DONTUNMAP", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "8de0b79666e1575cebf9112e4eb46165cdc9f450", "submitter": { "id": 85577, "url": "http://patchwork.ozlabs.org/api/1.2/people/85577/?format=api", "name": "Wei Gao", "email": "wegao@suse.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/ltp/patch/20260422023115.27534-1-wegao@suse.com/mbox/", "series": [ { "id": 500913, "url": "http://patchwork.ozlabs.org/api/1.2/series/500913/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ltp/list/?series=500913", "date": "2026-04-22T02:30:59", "name": "[v9] mremap07.c: New test for mremap() with MREMAP_DONTUNMAP", "version": 9, "mbox": "http://patchwork.ozlabs.org/series/500913/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2226025/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226025/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "ltp@lists.linux.it" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "ltp@picard.linux.it" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=lists.linux.it header.i=@lists.linux.it\n header.a=rsa-sha256 header.s=picard header.b=NFfckL2y;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=suse.com header.i=@suse.com header.a=rsa-sha256\n header.s=google header.b=VCkGskWk;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Errors-To": "ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it", "Sender": "\"ltp\" <ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it>" }, "content": "This test verifies the mremap() syscall with the MREMAP_DONTUNMAP flag.\nIt uses userfaultfd to verify that accessing the old memory region\ncorrectly triggers a page fault after the mapping has been moved.\n\nMREMAP_DONTUNMAP behavior with userfaultfd was not covered by existing\nmremap tests. This test provides coverage for the feature requested in\nthe linked issue.\n\nCloses: https://github.com/linux-test-project/ltp/issues/1168\nSigned-off-by: Wei Gao <wegao@suse.com>\n---\nv8->v9:\n- Removed `MREMAP_DONTUNMAP` check from `configure.ac` and moved fallback to `include/lapi/mmap.h`.\n- Renamed address variables to `old_addr` and `new_addr` for clarity.\n- Replaced hardcoded strings with `TEST_STRING_A` and `TEST_STRING_B` macros.\n- Improved code formatting and indentation.\n- Removed `.min_kver = \"5.7\"` in favor of dynamic feature detection.\n- Added runtime `EINVAL` check to trigger `TCONF` on unsupported kernels.\n- Added verification logic for data content at `new_addr`.\n- Fixed stability issues for multiple test iterations (`-i` option).\n\n include/lapi/mmap.h | 4 +\n runtest/syscalls | 1 +\n testcases/kernel/syscalls/mremap/.gitignore | 1 +\n testcases/kernel/syscalls/mremap/Makefile | 1 +\n testcases/kernel/syscalls/mremap/mremap07.c | 164 ++++++++++++++++++++\n 5 files changed, 171 insertions(+)\n create mode 100644 testcases/kernel/syscalls/mremap/mremap07.c", "diff": "diff --git a/include/lapi/mmap.h b/include/lapi/mmap.h\nindex 248b64564..3908310f4 100644\n--- a/include/lapi/mmap.h\n+++ b/include/lapi/mmap.h\n@@ -91,6 +91,10 @@\n # define MAP_DROPPABLE 0x08\n #endif\n \n+#ifndef MREMAP_DONTUNMAP\n+# define MREMAP_DONTUNMAP 4\n+#endif\n+\n #ifndef MAP_FIXED_NOREPLACE\n \n #ifdef __alpha__\ndiff --git a/runtest/syscalls b/runtest/syscalls\nindex 5025b259f..df5dc02b5 100644\n--- a/runtest/syscalls\n+++ b/runtest/syscalls\n@@ -927,6 +927,7 @@ mremap03 mremap03\n mremap04 mremap04\n mremap05 mremap05\n mremap06 mremap06\n+mremap07 mremap07\n \n mseal01 mseal01\n mseal02 mseal02\ndiff --git a/testcases/kernel/syscalls/mremap/.gitignore b/testcases/kernel/syscalls/mremap/.gitignore\nindex ec15a19cd..292899e03 100644\n--- a/testcases/kernel/syscalls/mremap/.gitignore\n+++ b/testcases/kernel/syscalls/mremap/.gitignore\n@@ -4,3 +4,4 @@\n /mremap04\n /mremap05\n /mremap06\n+/mremap07\ndiff --git a/testcases/kernel/syscalls/mremap/Makefile b/testcases/kernel/syscalls/mremap/Makefile\nindex 9f5aca9ec..8811b887e 100644\n--- a/testcases/kernel/syscalls/mremap/Makefile\n+++ b/testcases/kernel/syscalls/mremap/Makefile\n@@ -8,5 +8,6 @@ LTPLIBS = ipc\n include $(top_srcdir)/include/mk/testcases.mk\n \n mremap04: LTPLDLIBS = -lltpipc\n+mremap07: LDLIBS += -lpthread\n \n include $(top_srcdir)/include/mk/generic_leaf_target.mk\ndiff --git a/testcases/kernel/syscalls/mremap/mremap07.c b/testcases/kernel/syscalls/mremap/mremap07.c\nnew file mode 100644\nindex 000000000..ecd8319f9\n--- /dev/null\n+++ b/testcases/kernel/syscalls/mremap/mremap07.c\n@@ -0,0 +1,164 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (c) 2026 Wei Gao <wegao@suse.com>\n+ */\n+\n+/*\\\n+ * LTP test case for mremap() with MREMAP_DONTUNMAP and userfaultfd.\n+ *\n+ * Test mremap() with MREMAP_DONTUNMAP and verify that accessing the\n+ * old memory region triggers a page fault, which is then correctly\n+ * handled by a userfaultfd handler.\n+ */\n+\n+#define _GNU_SOURCE\n+#include <poll.h>\n+#include <pthread.h>\n+\n+#include \"tst_test.h\"\n+#include \"tst_safe_pthread.h\"\n+#include \"lapi/userfaultfd.h\"\n+#include \"lapi/mmap.h\"\n+#include \"config.h\"\n+\n+static int page_size;\n+static int uffd = -1;\n+static char *old_addr;\n+static char *new_addr;\n+\n+#define TEST_STRING_A \"ABCD\"\n+#define TEST_STRING_B \"EFGH\"\n+\n+static void *fault_handler_thread(void *arg LTP_ATTRIBUTE_UNUSED)\n+{\n+\tstruct uffd_msg msg;\n+\tstruct uffdio_copy uffdio_copy;\n+\n+\tTST_CHECKPOINT_WAIT(0);\n+\n+\tstruct pollfd pollfd;\n+\n+\tpollfd.fd = uffd;\n+\tpollfd.events = POLLIN;\n+\n+\tint nready = poll(&pollfd, 1, -1);\n+\n+\tif (nready == -1)\n+\t\ttst_brk(TBROK | TERRNO, \"poll() failed\");\n+\n+\tif (nready == 0)\n+\t\ttst_brk(TBROK, \"poll() timed out unexpectedly\");\n+\n+\tSAFE_READ(1, uffd, &msg, sizeof(msg));\n+\n+\tif (msg.event != UFFD_EVENT_PAGEFAULT)\n+\t\ttst_brk(TBROK, \"Received unexpected UFFD_EVENT: %d\", msg.event);\n+\n+\tif ((char *)msg.arg.pagefault.address != old_addr)\n+\t\ttst_brk(TBROK, \"Page fault on unexpected address: %p\",\n+\t\t\t(void *)msg.arg.pagefault.address);\n+\n+\ttst_res(TINFO, \"Userfaultfd handler caught a page fault at %p\",\n+\t\t(void *)msg.arg.pagefault.address);\n+\n+\tuffdio_copy.src = (unsigned long)new_addr;\n+\tuffdio_copy.dst = (unsigned long)old_addr;\n+\tuffdio_copy.len = page_size;\n+\tuffdio_copy.mode = 0;\n+\tuffdio_copy.copy = 0;\n+\n+\tSAFE_IOCTL(uffd, UFFDIO_COPY, &uffdio_copy);\n+\ttst_res(TPASS, \"Userfaultfd handler successfully handled the fault\");\n+\n+\treturn NULL;\n+}\n+\n+static void setup(void)\n+{\n+\tstruct uffdio_api uffdio_api;\n+\tstruct uffdio_register uffdio_register;\n+\n+\tpage_size = getpagesize();\n+\tuffd = SAFE_USERFAULTFD(O_CLOEXEC | O_NONBLOCK, true);\n+\n+\tuffdio_api.api = UFFD_API;\n+\tuffdio_api.features = 0;\n+\tSAFE_IOCTL(uffd, UFFDIO_API, &uffdio_api);\n+\n+\told_addr = SAFE_MMAP(NULL, page_size,\n+\t\t\t PROT_READ | PROT_WRITE,\n+\t\t\t MAP_PRIVATE | MAP_ANONYMOUS,\n+\t\t\t -1, 0);\n+\n+\ttst_res(TINFO, \"Original mapping created at %p\", (void *)old_addr);\n+\n+\tstrcpy(old_addr, TEST_STRING_A);\n+\n+\tuffdio_register.range.start = (unsigned long)old_addr;\n+\tuffdio_register.range.len = page_size;\n+\tuffdio_register.mode = UFFDIO_REGISTER_MODE_MISSING;\n+\tSAFE_IOCTL(uffd, UFFDIO_REGISTER, &uffdio_register);\n+}\n+\n+static void cleanup(void)\n+{\n+\tif (new_addr && new_addr != MAP_FAILED)\n+\t\tSAFE_MUNMAP(new_addr, page_size);\n+\n+\tif (old_addr && old_addr != MAP_FAILED)\n+\t\tSAFE_MUNMAP(old_addr, page_size);\n+\n+\tif (uffd != -1)\n+\t\tSAFE_CLOSE(uffd);\n+}\n+\n+static void run(void)\n+{\n+\tnew_addr = NULL;\n+\tpthread_t handler_thread;\n+\n+\tSAFE_PTHREAD_CREATE(&handler_thread, NULL,\n+\t\t\t fault_handler_thread, NULL);\n+\n+\tnew_addr = mremap(old_addr, page_size, page_size,\n+\t\t\t MREMAP_DONTUNMAP | MREMAP_MAYMOVE, NULL);\n+\n+\tif (new_addr == MAP_FAILED) {\n+\t\tif (errno == EINVAL) {\n+\t\t\ttst_brk(TCONF | TERRNO,\n+\t\t\t\t\"mremap with MREMAP_DONTUNMAP not supported?\");\n+\t\t}\n+\t\ttst_brk(TBROK | TERRNO, \"mremap failed\");\n+\t}\n+\n+\ttst_res(TINFO, \"New mapping created at %p\", (void *)new_addr);\n+\n+\tTST_EXP_EQ_STR(new_addr, TEST_STRING_A);\n+\tstrcpy(new_addr, TEST_STRING_B);\n+\n+\tTST_CHECKPOINT_WAKE(0);\n+\n+\ttst_res(TINFO, \"Main thread accessing old address %p to trigger fault\",\n+\t\t(void *)old_addr);\n+\n+\t(void)*(volatile char *)old_addr;\n+\n+\tSAFE_PTHREAD_JOIN(handler_thread, NULL);\n+\n+\tTST_EXP_EQ_STR(old_addr, TEST_STRING_B);\n+\n+\tSAFE_MUNMAP(new_addr, page_size);\n+\tnew_addr = NULL;\n+\tstrcpy(old_addr, TEST_STRING_A);\n+}\n+\n+static struct tst_test test = {\n+\t.test_all = run,\n+\t.setup = setup,\n+\t.needs_checkpoints = 1,\n+\t.cleanup = cleanup,\n+\t.needs_kconfigs = (const char *[]) {\n+\t\t\"CONFIG_USERFAULTFD=y\",\n+\t\tNULL,\n+\t},\n+};\n", "prefixes": [ "v9" ] }