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GET /api/1.0/patches/2220116/?format=api
{ "id": 2220116, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2220116/?format=api", "project": { "id": 59, "url": "http://patchwork.ozlabs.org/api/1.0/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": "" }, "msgid": "<20260407050634.124265-1-samir@linux.ibm.com>", "date": "2026-04-07T05:06:34", "name": "[v6] hugemmap37: Migrate truncate_sigbus_versus_oom from libhugetlbfs", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "855bba70970dc8c22989410dc9488a28dd8fd090", "submitter": { "id": 91376, "url": "http://patchwork.ozlabs.org/api/1.0/people/91376/?format=api", "name": "“Samir", "email": "samir@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/ltp/patch/20260407050634.124265-1-samir@linux.ibm.com/mbox/", "series": [ { "id": 498845, "url": "http://patchwork.ozlabs.org/api/1.0/series/498845/?format=api", "date": "2026-04-07T05:06:34", "name": "[v6] hugemmap37: Migrate truncate_sigbus_versus_oom from libhugetlbfs", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/498845/mbox/" } ], "check": "warning", "checks": "http://patchwork.ozlabs.org/api/patches/2220116/checks/", "tags": {}, "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=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=XebH4AdZ;\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": "Some kernels have a bug in the positioning of the test against\ni_size. This bug means that attempting to instantiate a page\nbeyond the end of a hugepage file can result in an OOM and SIGKILL\ninstead of the correct SIGBUS.\n\nThis test verifies that accessing memory beyond a truncated hugepage\nfile correctly triggers SIGBUS rather than causing an OOM condition.\n\nSigned-off-by: Samir <samir@linux.ibm.com>\n---\nv6:\n1. Fixed description: Removed dangling comma and improved clarity\n2. Added 'static' keyword to setup() and cleanup() functions\n3. Fixed signal handler initialization:\n - Zero-initialized struct sigaction with = {}\n - Added sigemptyset(&sa.sa_mask)\n - Removed SA_SIGINFO flag (using sa_handler, not sa_sigaction)\n4. Removed dead code: Deleted unused totpages assignment from setup()\n5. Fixed resource leaks in run_test():\n - Added SAFE_MUNMAP() for both mapped regions (p and q)\n - Added SAFE_CLOSE() for both file descriptors (fd and fdx)\n - Reset fd and fdx to -1 after closing\n6. Fixed cleanup() checks: Changed 'if (fd > 0)' to 'if (fd != -1)'\n7. Initialized file descriptors to -1 at declaration\n---\n runtest/hugetlb | 1 +\n testcases/kernel/mem/.gitignore | 1 +\n .../kernel/mem/hugetlb/hugemmap/hugemmap37.c | 106 ++++++++++++++++++\n 3 files changed, 108 insertions(+)\n create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap37.c", "diff": "diff --git a/runtest/hugetlb b/runtest/hugetlb\nindex 0896d3c94..8aaafeee3 100644\n--- a/runtest/hugetlb\n+++ b/runtest/hugetlb\n@@ -36,6 +36,7 @@ hugemmap30 hugemmap30\n hugemmap31 hugemmap31\n hugemmap32 hugemmap32\n hugemmap34 hugemmap34\n+hugemmap37 hugemmap37\n hugemmap05_1 hugemmap05 -m\n hugemmap05_2 hugemmap05 -s\n hugemmap05_3 hugemmap05 -s -m\ndiff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore\nindex b4455de51..38d428fe8 100644\n--- a/testcases/kernel/mem/.gitignore\n+++ b/testcases/kernel/mem/.gitignore\n@@ -36,6 +36,7 @@\n /hugetlb/hugemmap/hugemmap31\n /hugetlb/hugemmap/hugemmap32\n /hugetlb/hugemmap/hugemmap34\n+/hugetlb/hugemmap/hugemmap37\n /hugetlb/hugeshmat/hugeshmat01\n /hugetlb/hugeshmat/hugeshmat02\n /hugetlb/hugeshmat/hugeshmat03\ndiff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap37.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap37.c\nnew file mode 100644\nindex 000000000..06813b976\n--- /dev/null\n+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap37.c\n@@ -0,0 +1,106 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation.\n+ */\n+\n+/*\\\n+ * Some kernels have a bug in the positioning of the test against\n+ * i_size. This bug means that attempting to instantiate a page\n+ * beyond the end of a hugepage file can result in an OOM and SIGKILL\n+ * instead of the correct SIGBUS.\n+ *\n+ * The test:\n+ * - Creates a hugepage file and maps it\n+ * - Truncates the file to 0 size\n+ * - Allocates all available hugepages to create memory pressure\n+ * - Attempts to access the mapped memory\n+ * - Verifies SIGBUS is received (correct behavior)\n+ */\n+\n+#include \"hugetlb.h\"\n+#include <setjmp.h>\n+#include <signal.h>\n+\n+#define MNTPOINT \"hugetlbfs/\"\n+static int fd = -1, fdx = -1;\n+\n+static unsigned long long hpage_size;\n+static unsigned long totpages;\n+\n+static sigjmp_buf sig_escape;\n+static volatile int test_pass;\n+\n+static void sigbus_handler(int signum LTP_ATTRIBUTE_UNUSED)\n+{\n+\ttest_pass = 1;\n+\tsiglongjmp(sig_escape, 17);\n+}\n+\n+static void run_test(void)\n+{\n+\tvoid *p, *q;\n+\tunsigned long i;\n+\n+\ttest_pass = 0;\n+\n+\tfd = tst_creat_unlinked(MNTPOINT, 0, 0600);\n+\tp = SAFE_MMAP(NULL, hpage_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);\n+\tSAFE_FTRUNCATE(fd, 0);\n+\n+\tfdx = tst_creat_unlinked(MNTPOINT, 0, 0600);\n+\ttotpages = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);\n+\tq = SAFE_MMAP(NULL, totpages * hpage_size, PROT_READ | PROT_WRITE, MAP_SHARED,\n+\t\t\tfdx, 0);\n+\t/* Touch the pages to ensure they're removed from the pool */\n+\tfor (i = 0; i < totpages; i++) {\n+\t\tvolatile char *x = (volatile char *)q + i * hpage_size;\n+\t\t*x = 0;\n+\t}\n+\t/* SIGBUS is what *should* happen */\n+\tSAFE_FTRUNCATE(fdx, 0);\n+\tif (sigsetjmp(sig_escape, 1) == 0)\n+\t\t*((volatile unsigned int *)p);\n+\n+\tif (test_pass)\n+\t\ttst_res(TPASS, \"Expected SIGBUS triggered\");\n+\telse\n+\t\ttst_res(TFAIL, \"Didn't SIGBUS\");\n+\n+\tSAFE_MUNMAP(p, hpage_size);\n+\tSAFE_MUNMAP(q, totpages * hpage_size);\n+\tSAFE_CLOSE(fd);\n+\tSAFE_CLOSE(fdx);\n+\tfd = -1;\n+\tfdx = -1;\n+}\n+\n+static void setup(void)\n+{\n+\tstruct sigaction sa = {};\n+\n+\tsigemptyset(&sa.sa_mask);\n+\tsa.sa_flags = 0;\n+\tsa.sa_handler = sigbus_handler;\n+\tSAFE_SIGACTION(SIGBUS, &sa, NULL);\n+\thpage_size = tst_get_hugepage_size();\n+}\n+\n+static void cleanup(void)\n+{\n+\tif (fd != -1)\n+\t\tSAFE_CLOSE(fd);\n+\tif (fdx != -1)\n+\t\tSAFE_CLOSE(fdx);\n+}\n+\n+static struct tst_test test = {\n+\t.tags = (struct tst_tag[]){{\"linux-git\", \"ebed4bfc8da8\"}, {}},\n+\t.needs_root = 1,\n+\t.mntpoint = MNTPOINT,\n+\t.needs_hugetlbfs = 1,\n+\t.needs_tmpdir = 1,\n+\t.setup = setup,\n+\t.cleanup = cleanup,\n+\t.test_all = run_test,\n+\t.hugepages = {1, TST_NEEDS},\n+};\n", "prefixes": [ "v6" ] }