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GET /api/patches/2224893/?format=api
{ "id": 2224893, "url": "http://patchwork.ozlabs.org/api/patches/2224893/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ltp/patch/20260419130053.13996-1-mmenashe@redhat.com/", "project": { "id": 59, "url": "http://patchwork.ozlabs.org/api/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": "<20260419130053.13996-1-mmenashe@redhat.com>", "list_archive_url": null, "date": "2026-04-19T13:00:53", "name": "[v3] futex: Add error coverage tests for wait, wake and cmp_requeue", "commit_ref": null, "pull_url": null, "state": "needs-review-ack", "archived": false, "hash": "aba7321c60861fb71836d69e8589a1e7bc444443", "submitter": { "id": 93123, "url": "http://patchwork.ozlabs.org/api/people/93123/?format=api", "name": "Michael Menasherov", "email": "mmenashe@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/ltp/patch/20260419130053.13996-1-mmenashe@redhat.com/mbox/", "series": [ { "id": 500499, "url": "http://patchwork.ozlabs.org/api/series/500499/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ltp/list/?series=500499", "date": "2026-04-19T13:00:53", "name": "[v3] futex: Add error coverage tests for wait, wake and cmp_requeue", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/500499/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224893/comments/", "check": "warning", "checks": "http://patchwork.ozlabs.org/api/patches/2224893/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=PgycD+wB;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=T/A80tyU;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=213.254.12.146; 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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": "Improve error handling coverage for futex syscalls by adding tests\nfor missing error conditions that were previously untested.\n\nfutex_wait06 verifies EFAULT is returned when uaddr or timeout\npoints to unmapped memory.\n\nfutex_wait07 verifies EINTR is returned when futex_wait() is\ninterrupted by a signal.\n\nfutex_wake05 verifies EFAULT is returned when uaddr points to\nunmapped or PROT_NONE memory.\n\nfutex_cmp_requeue03 verifies EFAULT is returned when uaddr or\nuaddr2 points to unmapped memory, and EACCES or EFAULT when uaddr\npoints to memory without read permission (PROT_NONE). The EACCES\nbehavior was introduced in kernel 5.9.\n\nSigned-off-by: Michael Menasherov <mmenashe@redhat.com>\n---\nv3:\n- Fix copyright year 2024 -> 2026\n- Use /*\\ comment format for test catalog\n- Use TST_EXP_FAIL instead of manual error checks\n- Add kernel version check for EACCES in futex_cmp_requeue03\n- Restructure testcases to use direct pointers instead of flag fields\n- Remove obvious comments in futex_wait07\n- Remove manual SAFE_WAITPID, let library collect child\n- Remove curly braces around single-line if bodies\n- Replace raw mmap() with SAFE_MMAP() in futex_wait06\n\n runtest/syscalls | 4 +\n testcases/kernel/syscalls/futex/.gitignore | 4 +\n .../syscalls/futex/futex_cmp_requeue03.c | 96 +++++++++++++++++++\n .../kernel/syscalls/futex/futex_wait06.c | 73 ++++++++++++++\n .../kernel/syscalls/futex/futex_wait07.c | 91 ++++++++++++++++++\n .../kernel/syscalls/futex/futex_wake05.c | 86 +++++++++++++++++\n 6 files changed, 354 insertions(+)\n create mode 100644 testcases/kernel/syscalls/futex/futex_cmp_requeue03.c\n create mode 100644 testcases/kernel/syscalls/futex/futex_wait06.c\n create mode 100644 testcases/kernel/syscalls/futex/futex_wait07.c\n create mode 100644 testcases/kernel/syscalls/futex/futex_wake05.c", "diff": "diff --git a/runtest/syscalls b/runtest/syscalls\nindex 6ba0227a8..6c12dc225 100644\n--- a/runtest/syscalls\n+++ b/runtest/syscalls\n@@ -1859,11 +1859,14 @@ perf_event_open02 perf_event_open02\n \n futex_cmp_requeue01 futex_cmp_requeue01\n futex_cmp_requeue02 futex_cmp_requeue02\n+futex_cmp_requeue03 futex_cmp_requeue03\n futex_wait01 futex_wait01\n futex_wait02 futex_wait02\n futex_wait03 futex_wait03\n futex_wait04 futex_wait04\n futex_wait05 futex_wait05\n+futex_wait06 futex_wait06\n+futex_wait07 futex_wait07\n futex_waitv01 futex_waitv01\n futex_waitv02 futex_waitv02\n futex_waitv03 futex_waitv03\n@@ -1871,6 +1874,7 @@ futex_wake01 futex_wake01\n futex_wake02 futex_wake02\n futex_wake03 futex_wake03\n futex_wake04 futex_wake04\n+futex_wake05 futex_wake05\n futex_wait_bitset01 futex_wait_bitset01\n \n memfd_create01 memfd_create01\ndiff --git a/testcases/kernel/syscalls/futex/.gitignore b/testcases/kernel/syscalls/futex/.gitignore\nindex 9d08ba7d3..c47d39b5b 100644\n--- a/testcases/kernel/syscalls/futex/.gitignore\n+++ b/testcases/kernel/syscalls/futex/.gitignore\n@@ -1,15 +1,19 @@\n /futex_cmp_requeue01\n /futex_cmp_requeue02\n+/futex_cmp_requeue03\n /futex_wait01\n /futex_wait02\n /futex_wait03\n /futex_wait04\n /futex_wait05\n+/futex_wait06\n+/futex_wait07\n /futex_wait_bitset01\n /futex_wake01\n /futex_wake02\n /futex_wake03\n /futex_wake04\n+/futex_wake05\n /futex_waitv01\n /futex_waitv02\n /futex_waitv03\ndiff --git a/testcases/kernel/syscalls/futex/futex_cmp_requeue03.c b/testcases/kernel/syscalls/futex/futex_cmp_requeue03.c\nnew file mode 100644\nindex 000000000..099d5e35c\n--- /dev/null\n+++ b/testcases/kernel/syscalls/futex/futex_cmp_requeue03.c\n@@ -0,0 +1,96 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (C) 2026 Red Hat, Inc.\n+ */\n+\n+/*\\\n+ * Check that futex(FUTEX_CMP_REQUEUE) returns EFAULT when uaddr or\n+ * uaddr2 points to unmapped memory, and EACCES (or EFAULT on older kernels)\n+ * when uaddr points to memory without read permission (PROT_NONE).\n+ *\n+ * The EACCES behavior for PROT_NONE was introduced in kernel 5.9.\n+ */\n+\n+#include <errno.h>\n+#include <sys/mman.h>\n+\n+#include \"futextest.h\"\n+\n+static futex_t futex_var = FUTEX_INITIALIZER;\n+static futex_t *prot_none_addr;\n+\n+static struct futex_test_variants variants[] = {\n+#if (__NR_futex != __LTP__NR_INVALID_SYSCALL)\n+\t{ .fntype = FUTEX_FN_FUTEX, .desc = \"syscall with old kernel spec\"},\n+#endif\n+\n+#if (__NR_futex_time64 != __LTP__NR_INVALID_SYSCALL)\n+\t{ .fntype = FUTEX_FN_FUTEX64, .desc = \"syscall time64 with kernel spec\"},\n+#endif\n+};\n+\n+static struct testcase {\n+\tconst char *desc;\n+\tfutex_t *uaddr;\n+\tfutex_t *uaddr2;\n+\tint exp_errno;\n+} testcases[3];\n+\n+static void run(unsigned int n)\n+{\n+\tstruct futex_test_variants *tv = &variants[tst_variant];\n+\tstruct testcase *tc = &testcases[n];\n+\n+\tTST_EXP_FAIL(futex_cmp_requeue(tv->fntype, tc->uaddr, futex_var,\n+\t\ttc->uaddr2, 1, 1, 0), tc->exp_errno, \"%s\", tc->desc);\n+}\n+\n+static void setup(void)\n+{\n+\tstruct futex_test_variants *tv = &variants[tst_variant];\n+\tsize_t pagesize = getpagesize();\n+\tfutex_t *unmapped;\n+\n+\ttst_res(TINFO, \"Testing variant: %s\", tv->desc);\n+\tfutex_supported_by_kernel(tv->fntype);\n+\n+\tunmapped = SAFE_MMAP(NULL, pagesize, PROT_READ | PROT_WRITE,\n+\t\tMAP_PRIVATE | MAP_ANONYMOUS, -1, 0);\n+\tSAFE_MUNMAP(unmapped, pagesize);\n+\n+\tprot_none_addr = SAFE_MMAP(NULL, pagesize, PROT_NONE,\n+\t\tMAP_PRIVATE | MAP_ANONYMOUS, -1, 0);\n+\n+\ttestcases[0] = (struct testcase){\n+\t\t.desc = \"uaddr unmapped\",\n+\t\t.uaddr = unmapped,\n+\t\t.uaddr2 = &futex_var,\n+\t\t.exp_errno = EFAULT,\n+\t};\n+\ttestcases[1] = (struct testcase){\n+\t\t.desc = \"uaddr2 unmapped\",\n+\t\t.uaddr = &futex_var,\n+\t\t.uaddr2 = unmapped,\n+\t\t.exp_errno = EFAULT,\n+\t};\n+\ttestcases[2] = (struct testcase){\n+\t\t.desc = \"uaddr PROT_NONE\",\n+\t\t.uaddr = prot_none_addr,\n+\t\t.uaddr2 = &futex_var,\n+\t\t.exp_errno = tst_kvercmp(5, 9, 0) >= 0 ? EACCES : EFAULT,\n+\t};\n+}\n+\n+static void cleanup(void)\n+{\n+\tif (prot_none_addr)\n+\t\tSAFE_MUNMAP(prot_none_addr, getpagesize());\n+}\n+\n+static struct tst_test test = {\n+\t.setup = setup,\n+\t.cleanup = cleanup,\n+\t.test = run,\n+\t.tcnt = ARRAY_SIZE(testcases),\n+\t.test_variants = ARRAY_SIZE(variants),\n+};\ndiff --git a/testcases/kernel/syscalls/futex/futex_wait06.c b/testcases/kernel/syscalls/futex/futex_wait06.c\nnew file mode 100644\nindex 000000000..8bb563fb2\n--- /dev/null\n+++ b/testcases/kernel/syscalls/futex/futex_wait06.c\n@@ -0,0 +1,73 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (C) 2026 Red Hat, Inc.\n+ */\n+\n+/*\\\n+ * Check that futex(FUTEX_WAIT) returns EFAULT when:\n+ *\n+ * 1) uaddr points to unmapped memory\n+ * 2) timeout points to unmapped memory\n+ */\n+#include <errno.h>\n+#include <sys/mman.h>\n+\n+#include \"futextest.h\"\n+\n+static futex_t futex = FUTEX_INITIALIZER;\n+\n+static struct futex_test_variants variants[] = {\n+#if (__NR_futex != __LTP__NR_INVALID_SYSCALL)\n+\t{ .fntype = FUTEX_FN_FUTEX, .tstype = TST_KERN_OLD_TIMESPEC, .desc = \"syscall with old kernel spec\"},\n+#endif\n+\n+#if (__NR_futex_time64 != __LTP__NR_INVALID_SYSCALL)\n+\t{ .fntype = FUTEX_FN_FUTEX64, .tstype = TST_KERN_TIMESPEC, .desc = \"syscall time64 with kernel spec\"},\n+#endif\n+};\n+\n+static struct testcase {\n+\tconst char *desc;\n+\tfutex_t *uaddr;\n+\tvoid *timeout;\n+} testcases[2];\n+\n+static void run(unsigned int n)\n+{\n+\tstruct futex_test_variants *tv = &variants[tst_variant];\n+\tstruct testcase *tc = &testcases[n];\n+\n+\tTST_EXP_FAIL(futex_syscall(tv->fntype, tc->uaddr, FUTEX_WAIT, futex,\n+\t\ttc->timeout, NULL, 0, 0), EFAULT, \"%s\", tc->desc);\n+}\n+\n+static void setup(void)\n+{\n+\tstruct futex_test_variants *tv = &variants[tst_variant];\n+\tvoid *bad;\n+\n+\ttst_res(TINFO, \"Testing variant: %s\", tv->desc);\n+\tfutex_supported_by_kernel(tv->fntype);\n+\n+\tbad = SAFE_MMAP(NULL, getpagesize(), PROT_READ | PROT_WRITE,\n+\t\tMAP_PRIVATE | MAP_ANONYMOUS, -1, 0);\n+\tSAFE_MUNMAP(bad, getpagesize());\n+\n+\ttestcases[0] = (struct testcase){\n+\t\t.desc = \"uaddr points to unmapped memory\",\n+\t\t.uaddr = bad,\n+\t\t.timeout = NULL,\n+\t};\n+\ttestcases[1] = (struct testcase){\n+\t\t.desc = \"timeout points to unmapped memory\",\n+\t\t.uaddr = &futex,\n+\t\t.timeout = bad,\n+\t};\n+}\n+\n+static struct tst_test test = {\n+\t.setup = setup,\n+\t.test = run,\n+\t.tcnt = ARRAY_SIZE(testcases),\n+\t.test_variants = ARRAY_SIZE(variants),\n+};\ndiff --git a/testcases/kernel/syscalls/futex/futex_wait07.c b/testcases/kernel/syscalls/futex/futex_wait07.c\nnew file mode 100644\nindex 000000000..c3063389a\n--- /dev/null\n+++ b/testcases/kernel/syscalls/futex/futex_wait07.c\n@@ -0,0 +1,91 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (C) 2026 Red Hat, Inc.\n+ */\n+\n+/*\\\n+ * Check that futex(FUTEX_WAIT) returns EINTR when interrupted by a signal.\n+ * A child process blocks on futex_wait() with a long timeout. The parent\n+ * waits for the child to enter sleep state, then sends SIGUSR1 to it.\n+ * The child verifies it received EINTR and exits accordingly.\n+ */\n+\n+#include <errno.h>\n+#include <signal.h>\n+\n+#include \"futextest.h\"\n+\n+static futex_t *futex;\n+\n+static struct futex_test_variants variants[] = {\n+#if (__NR_futex != __LTP__NR_INVALID_SYSCALL)\n+\t{ .fntype = FUTEX_FN_FUTEX, .tstype = TST_KERN_OLD_TIMESPEC, .desc = \"syscall with old kernel spec\"},\n+#endif\n+\n+#if (__NR_futex_time64 != __LTP__NR_INVALID_SYSCALL)\n+\t{ .fntype = FUTEX_FN_FUTEX64, .tstype = TST_KERN_TIMESPEC, .desc = \"syscall time64 with kernel spec\"},\n+#endif\n+};\n+\n+/* We need a handler so SIGUSR1 is caught instead of killing the process.\n+ * The empty body is needed, just receiving the signal is enough to\n+ * interrupt futex_wait() and make it return into EINTR -1 status.\n+ */\n+static void sigusr1_handler(int sig LTP_ATTRIBUTE_UNUSED)\n+{\n+}\n+\n+static void do_child(void)\n+{\n+\tstruct futex_test_variants *tv = &variants[tst_variant];\n+\tstruct sigaction sa;\n+\tstruct tst_ts timeout;\n+\n+\tsa.sa_handler = sigusr1_handler;\n+\tsa.sa_flags = 0;\n+\tSAFE_SIGEMPTYSET(&sa.sa_mask);\n+\tSAFE_SIGACTION(SIGUSR1, &sa, NULL);\n+\n+\ttimeout = tst_ts_from_ms(tv->tstype, 5000);\n+\tTST_EXP_FAIL(futex_wait(tv->fntype, futex, *futex, &timeout, 0), EINTR);\n+\texit(0);\n+}\n+\n+static void run(void)\n+{\n+\tpid_t child;\n+\n+\tchild = SAFE_FORK();\n+\n+\tif (child == 0)\n+\t\tdo_child();\n+\n+\tTST_PROCESS_STATE_WAIT(child, 'S', 0);\n+\tSAFE_KILL(child, SIGUSR1);\n+}\n+\n+static void setup(void)\n+{\n+\tstruct futex_test_variants *tv = &variants[tst_variant];\n+\n+\ttst_res(TINFO, \"Testing variant: %s\", tv->desc);\n+\tfutex_supported_by_kernel(tv->fntype);\n+\n+\tfutex = SAFE_MMAP(NULL, sizeof(*futex), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);\n+\t*futex = FUTEX_INITIALIZER;\n+}\n+\n+static void cleanup(void)\n+{\n+\tif (futex) {\n+\t\tSAFE_MUNMAP((void *)futex, sizeof(*futex));\n+\t}\n+}\n+\n+static struct tst_test test = {\n+\t.setup = setup,\n+\t.cleanup = cleanup,\n+\t.test_all = run,\n+\t.test_variants = ARRAY_SIZE(variants),\n+\t.forks_child = 1,\n+};\ndiff --git a/testcases/kernel/syscalls/futex/futex_wake05.c b/testcases/kernel/syscalls/futex/futex_wake05.c\nnew file mode 100644\nindex 000000000..1e9bd6435\n--- /dev/null\n+++ b/testcases/kernel/syscalls/futex/futex_wake05.c\n@@ -0,0 +1,86 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (C) 2026 Red Hat, Inc.\n+ */\n+\n+/*\\\n+ * Check that futex(FUTEX_WAKE) returns EFAULT when uaddr points to\n+ * unmapped or PROT_NONE memory.\n+ *\n+ * Note: FUTEX_WAKE never reads *uaddr, so PROT_NONE triggers EFAULT\n+ * (not EACCES). The EACCES behavior only applies to syscalls that read\n+ * *uaddr (e.g. FUTEX_WAIT, FUTEX_CMP_REQUEUE).\n+ */\n+\n+#include <errno.h>\n+#include <sys/mman.h>\n+#include \"futextest.h\"\n+\n+static futex_t *prot_none_addr;\n+\n+static struct futex_test_variants variants[] = {\n+#if (__NR_futex != __LTP__NR_INVALID_SYSCALL)\n+\t{ .fntype = FUTEX_FN_FUTEX, .desc = \"syscall with old kernel spec\"},\n+#endif\n+\n+#if (__NR_futex_time64 != __LTP__NR_INVALID_SYSCALL)\n+\t{ .fntype = FUTEX_FN_FUTEX64, .desc = \"syscall time64 with kernel spec\"},\n+#endif\n+};\n+\n+static struct testcase {\n+\tconst char *desc;\n+\tfutex_t *addr;\n+\tint exp_errno;\n+} testcases[2];\n+\n+static void run(unsigned int n)\n+{\n+\tstruct futex_test_variants *tv = &variants[tst_variant];\n+\tstruct testcase *tc = &testcases[n];\n+\n+\tTST_EXP_FAIL(futex_wake(tv->fntype, tc->addr, 1, 0),\n+\t\ttc->exp_errno, \"%s\", tc->desc);\n+}\n+\n+static void setup(void)\n+{\n+\tstruct futex_test_variants *tv = &variants[tst_variant];\n+\tsize_t pagesize = getpagesize();\n+\tfutex_t *unmapped;\n+\n+\ttst_res(TINFO, \"Testing variant: %s\", tv->desc);\n+\tfutex_supported_by_kernel(tv->fntype);\n+\n+\tunmapped = SAFE_MMAP(NULL, pagesize, PROT_READ | PROT_WRITE,\n+\t\tMAP_PRIVATE | MAP_ANONYMOUS, -1, 0);\n+\tSAFE_MUNMAP(unmapped, pagesize);\n+\n+\tprot_none_addr = SAFE_MMAP(NULL, pagesize, PROT_NONE,\n+\t\tMAP_PRIVATE | MAP_ANONYMOUS, -1, 0);\n+\n+\ttestcases[0] = (struct testcase){\n+\t\t.desc = \"uaddr unmapped\",\n+\t\t.addr = unmapped,\n+\t\t.exp_errno = EFAULT,\n+\t};\n+\ttestcases[1] = (struct testcase){\n+\t\t.desc = \"uaddr PROT_NONE\",\n+\t\t.addr = prot_none_addr,\n+\t\t.exp_errno = EFAULT,\n+\t};\n+}\n+\n+static void cleanup(void)\n+{\n+\tif (prot_none_addr)\n+\t\tSAFE_MUNMAP(prot_none_addr, getpagesize());\n+}\n+\n+static struct tst_test test = {\n+\t.setup = setup,\n+\t.cleanup = cleanup,\n+\t.test = run,\n+\t.tcnt = ARRAY_SIZE(testcases),\n+\t.test_variants = ARRAY_SIZE(variants),\n+};\n", "prefixes": [ "v3" ] }