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GET /api/patches/2196958/?format=api
{ "id": 2196958, "url": "http://patchwork.ozlabs.org/api/patches/2196958/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/patch/20260216172545.1179353-3-yury.khrustalev@arm.com/", "project": { "id": 41, "url": "http://patchwork.ozlabs.org/api/projects/41/?format=api", "name": "GNU C Library", "link_name": "glibc", "list_id": "libc-alpha.sourceware.org", "list_email": "libc-alpha@sourceware.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260216172545.1179353-3-yury.khrustalev@arm.com>", "list_archive_url": null, "date": "2026-02-16T17:25:45", "name": "[v4,2/2] aarch64: Tests for locking GCS", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "1bfc431421fce6fe74fa36fd5ef649fbec5c428a", "submitter": { "id": 88214, "url": "http://patchwork.ozlabs.org/api/people/88214/?format=api", "name": "Yury Khrustalev", "email": "yury.khrustalev@arm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/glibc/patch/20260216172545.1179353-3-yury.khrustalev@arm.com/mbox/", "series": [ { "id": 492335, "url": "http://patchwork.ozlabs.org/api/series/492335/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/list/?series=492335", "date": "2026-02-16T17:25:44", "name": "aarch64: Support locking GCS", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/492335/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196958/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196958/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "libc-alpha@sourceware.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "libc-alpha@sourceware.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n 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<yury.khrustalev@arm.com>", "To": "<libc-alpha@sourceware.org>", "CC": "Adhemerval Zanella <adhemerval.zanella@linaro.org>, Florian Weimer\n <fweimer@redhat.com>, Mark Brown <broonie@kernel.org>, Jeremy Linton\n <jeremy.linton@arm.com>, Bill Roberts <bill.roberts@foss.arm.com>, \"Steve\n Capper\" <steve.capper@arm.com>, Andre Vieira <andre.simoesdiasvieira@arm.com>", "Subject": "[PATCH v4 2/2] aarch64: Tests for locking GCS", "Date": "Mon, 16 Feb 2026 17:25:45 +0000", "Message-ID": "<20260216172545.1179353-3-yury.khrustalev@arm.com>", "X-Mailer": "git-send-email 2.47.3", "In-Reply-To": "<20260216172545.1179353-1-yury.khrustalev@arm.com>", "References": "<20260216172545.1179353-1-yury.khrustalev@arm.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-EOPAttributedMessage": "1", "X-MS-TrafficTypeDiagnostic": "\n AMS0EPF000001B2:EE_|GV1PR08MB10838:EE_|AMS1EPF00000090:EE_|GVXPR08MB11785:EE_", "X-MS-Office365-Filtering-Correlation-Id": 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"X-MS-Exchange-CrossTenant-Network-Message-Id": "\n df1e1b44-14b8-4e1e-da8b-08de6d8099de", "X-MS-Exchange-CrossTenant-Id": "f34e5979-57d9-4aaa-ad4d-b122a662184d", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n AMS1EPF00000090.eurprd05.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-BeenThere": "libc-alpha@sourceware.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Libc-alpha mailing list <libc-alpha.sourceware.org>", "List-Unsubscribe": "<https://sourceware.org/mailman/options/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>", "List-Archive": "<https://sourceware.org/pipermail/libc-alpha/>", "List-Post": "<mailto:libc-alpha@sourceware.org>", "List-Help": "<mailto:libc-alpha-request@sourceware.org?subject=help>", "List-Subscribe": "<https://sourceware.org/mailman/listinfo/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=subscribe>", "Errors-To": "libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org" }, "content": "Check that GCS is locked properly based on the value of the\nglibc.cpu.aarch64_gcs tunable.\n\nTest tst-gcs-execv checks that a child process can be spawned correctly\nwhen GCS is locked for the parent process.\n\nTest tst-gcs-fork checks that if GCS is not locked for the parent\nprocess, the forked child can disable GCS.\n\nTests tst-gcs-lock and tst-gcs-lock-static check that GCS is locked\nfor dynamic and static executables when run with aarch64_gcs=1.\n\nTests tst-gcs-unlock and tst-gcs-unlock-static check that GCS is not\nlocked for dynamic and static executables when run with aarch64_gcs=0.\n\nTest tst-gcs-lock-ptrace checks via ptrace that when GCS is locked,\nall GCS features are locked.\n---\n sysdeps/unix/sysv/linux/aarch64/Makefile | 25 +++\n .../unix/sysv/linux/aarch64/tst-gcs-execv.c | 91 ++++++++++\n .../unix/sysv/linux/aarch64/tst-gcs-fork.c | 75 ++++++++\n .../unix/sysv/linux/aarch64/tst-gcs-helper.h | 5 +\n .../sysv/linux/aarch64/tst-gcs-lock-ptrace.c | 166 ++++++++++++++++++\n .../sysv/linux/aarch64/tst-gcs-lock-static.c | 1 +\n .../unix/sysv/linux/aarch64/tst-gcs-lock.c | 58 ++++++\n .../linux/aarch64/tst-gcs-unlock-static.c | 2 +\n .../unix/sysv/linux/aarch64/tst-gcs-unlock.c | 2 +\n 9 files changed, 425 insertions(+)\n create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-execv.c\n create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-fork.c\n create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock-ptrace.c\n create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock-static.c\n create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock.c\n create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-unlock-static.c\n create mode 100644 sysdeps/unix/sysv/linux/aarch64/tst-gcs-unlock.c", "diff": "diff --git a/sysdeps/unix/sysv/linux/aarch64/Makefile b/sysdeps/unix/sysv/linux/aarch64/Makefile\nindex 2b8401f42e..58bc119ace 100644\n--- a/sysdeps/unix/sysv/linux/aarch64/Makefile\n+++ b/sysdeps/unix/sysv/linux/aarch64/Makefile\n@@ -151,10 +151,14 @@ gcs-tests-dynamic = \\\n tst-gcs-dlopen-override \\\n tst-gcs-enforced \\\n tst-gcs-enforced-abort \\\n+ tst-gcs-execv \\\n+ tst-gcs-fork \\\n tst-gcs-ld-debug-both \\\n tst-gcs-ld-debug-dlopen \\\n tst-gcs-ld-debug-exe \\\n tst-gcs-ld-debug-shared \\\n+ tst-gcs-lock \\\n+ tst-gcs-lock-ptrace \\\n tst-gcs-noreturn \\\n tst-gcs-optional-off \\\n tst-gcs-optional-on \\\n@@ -167,15 +171,18 @@ gcs-tests-dynamic = \\\n tst-gcs-shared-enforced-abort \\\n tst-gcs-shared-optional \\\n tst-gcs-shared-override \\\n+ tst-gcs-unlock \\\n # gcs-tests-dynamic\n \n gcs-tests-static = \\\n tst-gcs-disabled-static \\\n tst-gcs-enforced-static \\\n tst-gcs-enforced-static-abort \\\n+ tst-gcs-lock-static \\\n tst-gcs-optional-static-off \\\n tst-gcs-optional-static-on \\\n tst-gcs-override-static \\\n+ tst-gcs-unlock-static \\\n # gcs-tests-static\n \n tests += \\\n@@ -225,6 +232,24 @@ tst-gcs-optional-static-on-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2\n tst-gcs-optional-static-off-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2\n tst-gcs-override-static-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=3\n \n+LDFLAGS-tst-gcs-execv += -Wl,-z,gcs=always\n+tst-gcs-execv-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1\n+tst-gcs-execv-ARGS = -- $(host-test-program-cmd)\n+LDFLAGS-tst-gcs-fork += -Wl,-z,gcs=always\n+tst-gcs-fork-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2\n+\n+LDFLAGS-tst-gcs-lock += -Wl,-z,gcs=always\n+tst-gcs-lock-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1\n+LDFLAGS-tst-gcs-lock-ptrace += -Wl,-z,gcs=always\n+tst-gcs-lock-ptrace-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1\n+tst-gcs-lock-ptrace-ARGS = -- $(host-test-program-cmd)\n+LDFLAGS-tst-gcs-lock-static += -Wl,-z,gcs=always\n+tst-gcs-lock-static-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1\n+LDFLAGS-tst-gcs-unlock += -Wl,-z,gcs=always\n+tst-gcs-unlock-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2\n+LDFLAGS-tst-gcs-unlock-static += -Wl,-z,gcs=always\n+tst-gcs-unlock-static-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2\n+\n # force one of the dependencies to be unmarked\n LDFLAGS-tst-gcs-mod2.so += -Wl,-z,gcs=never\n \ndiff --git a/sysdeps/unix/sysv/linux/aarch64/tst-gcs-execv.c b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-execv.c\nnew file mode 100644\nindex 0000000000..91053a4726\n--- /dev/null\n+++ b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-execv.c\n@@ -0,0 +1,91 @@\n+/* AArch64 test for GCS for creating child process.\n+ Copyright (C) 2026 Free Software Foundation, Inc.\n+ This file is part of the GNU C Library.\n+\n+ The GNU C Library is free software; you can redistribute it and/or\n+ modify it under the terms of the GNU Lesser General Public\n+ License as published by the Free Software Foundation; either\n+ version 2.1 of the License, or (at your option) any later version.\n+\n+ The GNU C Library is distributed in the hope that it will be useful,\n+ but WITHOUT ANY WARRANTY; without even the implied warranty of\n+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n+ Lesser General Public License for more details.\n+\n+ You should have received a copy of the GNU Lesser General Public\n+ License along with the GNU C Library; if not, see\n+ <https://www.gnu.org/licenses/>. */\n+\n+#include \"tst-gcs-helper.h\"\n+\n+#include <sys/prctl.h>\n+#include <unistd.h>\n+#include <errno.h>\n+#include <string.h>\n+\n+static int\n+target (void)\n+{\n+ /* In child. */\n+ printf (\"in child: %u\\n\", getpid ());\n+ TEST_VERIFY (__check_gcs_status ());\n+\n+ /* Try disabling GCS (should fail with EBUSY). */\n+ int res = prctl (PR_SET_SHADOW_STACK_STATUS, 0, 0, 0, 0);\n+ TEST_COMPARE (res, -1);\n+ TEST_COMPARE (errno, EBUSY);\n+ return 0;\n+}\n+\n+int main(int argc, char *argv[])\n+{\n+ /* Check if GCS could possible by enabled. */\n+ if (!(getauxval (AT_HWCAP) & HWCAP_GCS))\n+ FAIL_UNSUPPORTED (\"kernel or CPU does not support GCS\");\n+\n+ /* GCS should be enabled for this test at the start. */\n+ TEST_VERIFY (__check_gcs_status ());\n+\n+ /* If last argument is 'target', we just run target code. */\n+ if (strcmp (argv[argc - 1], \"target\") == 0)\n+ return target ();\n+\n+ /* In parent, we should at least have 3 arguments. */\n+ if (argc < 3)\n+ FAIL_EXIT1 (\"wrong number of arguments: %d\", argc);\n+\n+ char *child_args[] = { NULL, NULL, NULL, NULL, NULL, NULL };\n+\n+ /* Check command line arguments to construct child command. */\n+ if (strcmp (argv[0], argv[2]) == 0)\n+ {\n+ /* Command looks like\n+\t /path/to/test -- /path/to/test */\n+ /* /path/to/test */\n+ child_args[0] = argv[0];\n+ /* Extra argument for the child process. */\n+ child_args[1] = (char *)\"target\";\n+ }\n+ else\n+ {\n+ /* Command looks like\n+\t /path/to/test -- /path/to/ld.so ... */\n+ TEST_VERIFY_EXIT (argc > 5);\n+ TEST_COMPARE_STRING (argv[3], \"--library-path\");\n+ /* /path/to/ld-linux-aarch64.so.1 */\n+ child_args[0] = argv[2];\n+ /* --library-path */\n+ child_args[1] = argv[3];\n+ /* Library path... */\n+ child_args[2] = argv[4];\n+ /* /path/to/test */\n+ child_args[3] = argv[5];\n+ /* Extra argument for the child process. */\n+ child_args[4] = (char *)\"target\";\n+ }\n+\n+ printf (\"in parent: %u\\n\", getpid ());\n+ /* Spawn child process. */\n+ execv (child_args[0], child_args);\n+ FAIL_EXIT1 (\"execv: %m\");\n+}\ndiff --git a/sysdeps/unix/sysv/linux/aarch64/tst-gcs-fork.c b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-fork.c\nnew file mode 100644\nindex 0000000000..365807a562\n--- /dev/null\n+++ b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-fork.c\n@@ -0,0 +1,75 @@\n+/* AArch64 test for GCS for creating child process using fork.\n+ Copyright (C) 2026 Free Software Foundation, Inc.\n+ This file is part of the GNU C Library.\n+\n+ The GNU C Library is free software; you can redistribute it and/or\n+ modify it under the terms of the GNU Lesser General Public\n+ License as published by the Free Software Foundation; either\n+ version 2.1 of the License, or (at your option) any later version.\n+\n+ The GNU C Library is distributed in the hope that it will be useful,\n+ but WITHOUT ANY WARRANTY; without even the implied warranty of\n+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n+ Lesser General Public License for more details.\n+\n+ You should have received a copy of the GNU Lesser General Public\n+ License along with the GNU C Library; if not, see\n+ <https://www.gnu.org/licenses/>. */\n+\n+#include \"tst-gcs-helper.h\"\n+\n+#include <support/xunistd.h>\n+#include <sys/ptrace.h>\n+#include <sys/prctl.h>\n+#include <sys/wait.h>\n+#include <sys/uio.h>\n+#include <unistd.h>\n+#include <errno.h>\n+\n+static int\n+do_test (void)\n+{\n+ /* Check if GCS could possible by enabled. */\n+ if (!(getauxval (AT_HWCAP) & HWCAP_GCS))\n+ FAIL_UNSUPPORTED (\"kernel or CPU does not support GCS\");\n+\n+ /* GCS should be enabled for this test at the start. */\n+ TEST_VERIFY (__check_gcs_status ());\n+\n+ pid_t pid = xfork ();\n+ const char *name;\n+ if (pid == 0)\n+ name = \"child\";\n+ else\n+ name = \"parent\";\n+\n+ /* Both parent and child should initially have GCS enabled. */\n+ TEST_VERIFY (__check_gcs_status ());\n+ uint64_t data;\n+ if (prctl (PR_GET_SHADOW_STACK_STATUS, &data, 0, 0, 0))\n+ FAIL_EXIT1 (\"prctl: %m\");\n+ printf (\"in %s: gcs status: %016lx\\n\", name, data);\n+\n+ if (pid)\n+ {\n+ int status;\n+ xwaitpid (pid, &status, 0);\n+ printf (\"in %s: child exited with code %u\\n\", name, WEXITSTATUS(status));\n+ }\n+ else\n+ {\n+ /* Try disabling GCS for the child\n+\t (should succeed because of the tunable). */\n+ if (prctl (PR_SET_SHADOW_STACK_STATUS, 0, 0, 0, 0))\n+\tFAIL_EXIT1 (\"prctl: %m\");\n+ /* GCS should be disabled. */\n+ TEST_VERIFY (!__check_gcs_status ());\n+ if (prctl (PR_GET_SHADOW_STACK_STATUS, &data, 0, 0, 0))\n+\tFAIL_EXIT1 (\"prctl: %m\");\n+ printf (\"in %s: gcs status: %016lx\\n\", name, data);\n+ }\n+\n+ return 0;\n+}\n+\n+#include <support/test-driver.c>\ndiff --git a/sysdeps/unix/sysv/linux/aarch64/tst-gcs-helper.h b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-helper.h\nindex 493f65b3cc..c075fdc205 100644\n--- a/sysdeps/unix/sysv/linux/aarch64/tst-gcs-helper.h\n+++ b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-helper.h\n@@ -26,6 +26,11 @@\n #include <stdio.h>\n #include <sys/auxv.h>\n \n+#ifndef PR_SET_SHADOW_STACK_STATUS\n+# define PR_GET_SHADOW_STACK_STATUS 74\n+# define PR_SET_SHADOW_STACK_STATUS 75\n+#endif\n+\n static bool\n __check_gcs_status (void)\n {\ndiff --git a/sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock-ptrace.c b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock-ptrace.c\nnew file mode 100644\nindex 0000000000..9ca7b07eaf\n--- /dev/null\n+++ b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock-ptrace.c\n@@ -0,0 +1,166 @@\n+/* AArch64 test for GCS for creating child process using fork\n+ with ptrace to check locked GCS operations.\n+ Copyright (C) 2026 Free Software Foundation, Inc.\n+ This file is part of the GNU C Library.\n+\n+ The GNU C Library is free software; you can redistribute it and/or\n+ modify it under the terms of the GNU Lesser General Public\n+ License as published by the Free Software Foundation; either\n+ version 2.1 of the License, or (at your option) any later version.\n+\n+ The GNU C Library is distributed in the hope that it will be useful,\n+ but WITHOUT ANY WARRANTY; without even the implied warranty of\n+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n+ Lesser General Public License for more details.\n+\n+ You should have received a copy of the GNU Lesser General Public\n+ License along with the GNU C Library; if not, see\n+ <https://www.gnu.org/licenses/>. */\n+\n+#include \"tst-gcs-helper.h\"\n+\n+#include <support/xunistd.h>\n+#include <support/xsignal.h>\n+#include <sys/ptrace.h>\n+#include <sys/prctl.h>\n+#include <sys/wait.h>\n+#include <sys/uio.h>\n+#include <unistd.h>\n+#include <string.h>\n+#include <errno.h>\n+\n+/* Uapi struct for PTRACE_GETREGSET with NT_ARM_GCS. */\n+struct user_gcs\n+{\n+ uint64_t enabled;\n+ uint64_t locked;\n+ uint64_t gcspr_el0;\n+};\n+\n+static int\n+target (void)\n+{\n+ /* This signal is raised after the process has started\n+ and has been initialised so we can ptrace it at this\n+ point and obtain GCS locked features. */\n+ xraise (SIGUSR1);\n+ return 0;\n+}\n+\n+static void\n+fork_target (char *args[], uint64_t aarch64_gcs)\n+{\n+ /* Currently kernel returns only lower 32 bits of locked\n+ features so we only compare them. */\n+ bool lock_gcs = aarch64_gcs != 0 && aarch64_gcs != 2;\n+ uint64_t expected_locked = lock_gcs ? 0xfffffffful : 0ul;\n+ pid_t pid = xfork ();\n+ if (pid == 0)\n+ {\n+ char tunables[90];\n+ snprintf (tunables, sizeof (tunables), \"GLIBC_TUNABLES=\"\n+\t\t\"glibc.cpu.aarch64_gcs=0x%016lx\", aarch64_gcs);\n+ char *envp[] = { tunables, NULL };\n+ /* We need to ptrace child process to use PTRACE_GETREGSET\n+\t with NT_ARM_GCS after it has started. */\n+ int res = ptrace (PTRACE_TRACEME, 0, NULL, NULL);\n+ if (res)\n+\tFAIL_EXIT1 (\"ptrace: %m\");\n+ execve (args[0], args, envp);\n+ FAIL_EXIT1 (\"execve: %m\");\n+ }\n+ bool checked = false;\n+ while (true)\n+ {\n+ int status;\n+ xwaitpid (pid, &status, 0);\n+ if (WIFSTOPPED (status))\n+\t{\n+\t /* Child stopped by signal. */\n+\t int sig = WSTOPSIG (status);\n+\t if (sig == SIGUSR1)\n+\t {\n+\t struct user_gcs ugcs = {};\n+\t struct iovec io;\n+\t io.iov_base = &ugcs;\n+\t io.iov_len = sizeof (struct user_gcs);\n+\t if (ptrace (PTRACE_GETREGSET, pid, NT_ARM_GCS, &io))\n+\t\tFAIL_EXIT1 (\"ptrace (PTRACE_GETREGSET): %m\");\n+\t printf (\"expected vs locked: %016lx %016lx\\n\",\n+\t\t expected_locked, ugcs.locked);\n+\t if (lock_gcs)\n+\t\tTEST_VERIFY_EXIT (ugcs.enabled);\n+\t TEST_VERIFY_EXIT (ugcs.locked == expected_locked);\n+\t if (aarch64_gcs != 0)\n+\t\tTEST_VERIFY_EXIT ((void *) ugcs.gcspr_el0 != NULL);\n+\t checked = true;\n+\t }\n+ }\n+ else if (WIFSIGNALED (status))\n+\t{\n+\t /* Child terminated by signal. */\n+\t break;\n+\t}\n+ else if (WIFEXITED (status))\n+\t{\n+ /* Child terminated by normally. */\n+\t break;\n+\t}\n+ ptrace (PTRACE_CONT, pid, 0, 0);\n+ }\n+ /* If child process hasn't run correctly, this will remain false. */\n+ TEST_VERIFY_EXIT (checked);\n+}\n+\n+int main(int argc, char *argv[])\n+{\n+ /* Check if GCS could possible by enabled. */\n+ if (!(getauxval (AT_HWCAP) & HWCAP_GCS))\n+ FAIL_UNSUPPORTED (\"kernel or CPU does not support GCS\");\n+\n+ /* GCS should be enabled for this test. */\n+ TEST_VERIFY (__check_gcs_status ());\n+\n+ /* If last argument is 'target', we just run target code. */\n+ if (strcmp (argv[argc - 1], \"target\") == 0)\n+ return target ();\n+\n+ /* In parent, we should at least have 3 arguments. */\n+ if (argc < 3)\n+ FAIL_EXIT1 (\"wrong number of arguments: %d\", argc);\n+\n+ char *child_args[] = { NULL, NULL, NULL, NULL, NULL , NULL };\n+\n+ /* Check command line arguments to construct child command. */\n+ if (strcmp (argv[0], argv[2]) == 0)\n+ {\n+ /* Command looks like\n+\t /path/to/test -- /path/to/test */\n+ /* /path/to/test */\n+ child_args[0] = argv[0];\n+ /* Extra argument for the child process. */\n+ child_args[1] = (char *)\"target\";\n+ }\n+ else\n+ {\n+ /* Command looks like\n+\t /path/to/test -- /path/to/ld.so ... */\n+ TEST_VERIFY_EXIT (argc > 5);\n+ TEST_COMPARE_STRING (argv[3], \"--library-path\");\n+ /* /path/to/ld-linux-aarch64.so.1 */\n+ child_args[0] = argv[2];\n+ /* --library-path */\n+ child_args[1] = argv[3];\n+ /* Library path... */\n+ child_args[2] = argv[4];\n+ /* /path/to/test */\n+ child_args[3] = argv[5];\n+ /* Extra argument for the child process. */\n+ child_args[4] = (char *)\"target\";\n+ }\n+\n+ /* Check all 4 values for the aarch64_gcs tunable. */\n+ for (uint64_t aarch64_gcs = 0; aarch64_gcs < 4; aarch64_gcs++)\n+ fork_target (child_args, aarch64_gcs);\n+ return 0;\n+}\ndiff --git a/sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock-static.c b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock-static.c\nnew file mode 100644\nindex 0000000000..b80e2f70e8\n--- /dev/null\n+++ b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock-static.c\n@@ -0,0 +1 @@\n+#include \"tst-gcs-lock.c\"\ndiff --git a/sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock.c b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock.c\nnew file mode 100644\nindex 0000000000..9a17ef514d\n--- /dev/null\n+++ b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-lock.c\n@@ -0,0 +1,58 @@\n+/* AArch64 test for GCS locking.\n+ Copyright (C) 2026 Free Software Foundation, Inc.\n+ This file is part of the GNU C Library.\n+\n+ The GNU C Library is free software; you can redistribute it and/or\n+ modify it under the terms of the GNU Lesser General Public\n+ License as published by the Free Software Foundation; either\n+ version 2.1 of the License, or (at your option) any later version.\n+\n+ The GNU C Library is distributed in the hope that it will be useful,\n+ but WITHOUT ANY WARRANTY; without even the implied warranty of\n+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n+ Lesser General Public License for more details.\n+\n+ You should have received a copy of the GNU Lesser General Public\n+ License along with the GNU C Library; if not, see\n+ <https://www.gnu.org/licenses/>. */\n+\n+#include \"tst-gcs-helper.h\"\n+\n+#include <linux/prctl.h>\n+#include <sys/prctl.h>\n+#include <errno.h>\n+\n+static int\n+do_test (void)\n+{\n+ /* Check if GCS could possible by enabled. */\n+ if (!(getauxval (AT_HWCAP) & HWCAP_GCS))\n+ FAIL_UNSUPPORTED (\"kernel or CPU does not support GCS\");\n+\n+ TEST_VERIFY (__check_gcs_status ());\n+\n+ /* Try disabling GCS. */\n+ int res = prctl (PR_SET_SHADOW_STACK_STATUS, 0, 0, 0, 0);\n+ if (res)\n+ {\n+ TEST_COMPARE (errno, EBUSY);\n+#ifdef GCS_SHOULD_UNLOCK\n+ FAIL_EXIT1 (\"GCS was not unlocked (was supposed to): %m\");\n+#else\n+ TEST_VERIFY (__check_gcs_status ());\n+#endif\n+ }\n+ else\n+ {\n+#ifdef GCS_SHOULD_UNLOCK\n+ TEST_VERIFY (!__check_gcs_status ());\n+ puts (\"GCS unlocked successfully\");\n+#else\n+ FAIL_EXIT1 (\"GCS was unlocked (was not supposed to)\");\n+#endif\n+ }\n+\n+ return 0;\n+}\n+\n+#include <support/test-driver.c>\ndiff --git a/sysdeps/unix/sysv/linux/aarch64/tst-gcs-unlock-static.c b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-unlock-static.c\nnew file mode 100644\nindex 0000000000..7e02820031\n--- /dev/null\n+++ b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-unlock-static.c\n@@ -0,0 +1,2 @@\n+#define GCS_SHOULD_UNLOCK\n+#include \"tst-gcs-lock.c\"\ndiff --git a/sysdeps/unix/sysv/linux/aarch64/tst-gcs-unlock.c b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-unlock.c\nnew file mode 100644\nindex 0000000000..7e02820031\n--- /dev/null\n+++ b/sysdeps/unix/sysv/linux/aarch64/tst-gcs-unlock.c\n@@ -0,0 +1,2 @@\n+#define GCS_SHOULD_UNLOCK\n+#include \"tst-gcs-lock.c\"\n", "prefixes": [ "v4", "2/2" ] }