--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <unistd.h>
+
+#include "dexcr.h"
+#include "utils.h"
+
+/*
+ * Helper function for testing the behaviour of a newly exec-ed process
+ */
+static int dexcr_prctl_onexec_test_child(unsigned long which, const char *status)
+{
+ unsigned long dexcr = mfspr(SPRN_DEXCR_RO);
+ unsigned long aspect = pr_which_to_aspect(which);
+ int ctrl = pr_get_dexcr(which);
+
+ if (!strcmp(status, "set")) {
+ FAIL_IF_EXIT_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_SET),
+ "setting aspect across exec not applied");
+
+ FAIL_IF_EXIT_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_SET_ONEXEC),
+ "setting aspect across exec not inherited");
+
+ FAIL_IF_EXIT_MSG(!(aspect & dexcr), "setting aspect across exec did not take effect");
+ } else if (!strcmp(status, "clear")) {
+ FAIL_IF_EXIT_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_CLEAR),
+ "clearing aspect across exec not applied");
+
+ FAIL_IF_EXIT_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC),
+ "clearing aspect across exec not inherited");
+
+ FAIL_IF_EXIT_MSG(aspect & dexcr, "clearing aspect across exec did not take effect");
+ } else {
+ FAIL_IF_EXIT_MSG(true, "unknown expected status");
+ }
+
+ return 0;
+}
+
+/*
+ * Test that the given prctl value can be manipulated freely
+ */
+static int dexcr_prctl_aspect_test(unsigned long which)
+{
+ unsigned long aspect = pr_which_to_aspect(which);
+ pid_t pid;
+ int ctrl;
+ int err;
+ int errno_save;
+
+ SKIP_IF_MSG(!dexcr_exists(), "DEXCR not supported");
+ SKIP_IF_MSG(!pr_dexcr_aspect_supported(which), "DEXCR aspect not supported");
+ SKIP_IF_MSG(!pr_dexcr_aspect_editable(which), "DEXCR aspect not editable with prctl");
+
+ /* We reject invalid combinations of arguments */
+ err = pr_set_dexcr(which, PR_PPC_DEXCR_CTRL_SET | PR_PPC_DEXCR_CTRL_CLEAR);
+ errno_save = errno;
+ FAIL_IF_MSG(err != -1, "simultaneous set and clear should be rejected");
+ FAIL_IF_MSG(errno_save != EINVAL, "simultaneous set and clear should be rejected with EINVAL");
+
+ err = pr_set_dexcr(which, PR_PPC_DEXCR_CTRL_SET_ONEXEC | PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC);
+ errno_save = errno;
+ FAIL_IF_MSG(err != -1, "simultaneous set and clear on exec should be rejected");
+ FAIL_IF_MSG(errno_save != EINVAL, "simultaneous set and clear on exec should be rejected with EINVAL");
+
+ /* We set the aspect */
+ err = pr_set_dexcr(which, PR_PPC_DEXCR_CTRL_SET);
+ FAIL_IF_MSG(err, "PR_PPC_DEXCR_CTRL_SET failed");
+
+ ctrl = pr_get_dexcr(which);
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_SET), "config value not PR_PPC_DEXCR_CTRL_SET");
+ FAIL_IF_MSG(ctrl & PR_PPC_DEXCR_CTRL_CLEAR, "config value unexpected clear flag");
+ FAIL_IF_MSG(!(aspect & mfspr(SPRN_DEXCR_RO)), "setting aspect did not take effect");
+
+ /* We clear the aspect */
+ err = pr_set_dexcr(which, PR_PPC_DEXCR_CTRL_CLEAR);
+ FAIL_IF_MSG(err, "PR_PPC_DEXCR_CTRL_CLEAR failed");
+
+ ctrl = pr_get_dexcr(which);
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_CLEAR), "config value not PR_PPC_DEXCR_CTRL_CLEAR");
+ FAIL_IF_MSG(ctrl & PR_PPC_DEXCR_CTRL_SET, "config value unexpected set flag");
+ FAIL_IF_MSG(aspect & mfspr(SPRN_DEXCR_RO), "clearing aspect did not take effect");
+
+ /* We make it set on exec (doesn't change our current value) */
+ err = pr_set_dexcr(which, PR_PPC_DEXCR_CTRL_SET_ONEXEC);
+ FAIL_IF_MSG(err, "PR_PPC_DEXCR_CTRL_SET_ONEXEC failed");
+
+ ctrl = pr_get_dexcr(which);
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_CLEAR), "process aspect should still be cleared");
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_SET_ONEXEC), "config value not PR_PPC_DEXCR_CTRL_SET_ONEXEC");
+ FAIL_IF_MSG(ctrl & PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC, "config value unexpected clear on exec flag");
+ FAIL_IF_MSG(aspect & mfspr(SPRN_DEXCR_RO), "scheduling aspect to set on exec should not change it now");
+
+ /* We make it clear on exec (doesn't change our current value) */
+ err = pr_set_dexcr(which, PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC);
+ FAIL_IF_MSG(err, "PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC failed");
+
+ ctrl = pr_get_dexcr(which);
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_CLEAR), "process aspect config should still be cleared");
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC), "config value not PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC");
+ FAIL_IF_MSG(ctrl & PR_PPC_DEXCR_CTRL_SET_ONEXEC, "config value unexpected set on exec flag");
+ FAIL_IF_MSG(aspect & mfspr(SPRN_DEXCR_RO), "process aspect should still be cleared");
+
+ /* We allow setting the current and on-exec value in a single call */
+ err = pr_set_dexcr(which, PR_PPC_DEXCR_CTRL_SET | PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC);
+ FAIL_IF_MSG(err, "PR_PPC_DEXCR_CTRL_SET | PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC failed");
+
+ ctrl = pr_get_dexcr(which);
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_SET), "config value not PR_PPC_DEXCR_CTRL_SET");
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC), "config value not PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC");
+ FAIL_IF_MSG(!(aspect & mfspr(SPRN_DEXCR_RO)), "process aspect should be set");
+
+ err = pr_set_dexcr(which, PR_PPC_DEXCR_CTRL_CLEAR | PR_PPC_DEXCR_CTRL_SET_ONEXEC);
+ FAIL_IF_MSG(err, "PR_PPC_DEXCR_CTRL_CLEAR | PR_PPC_DEXCR_CTRL_SET_ONEXEC failed");
+
+ ctrl = pr_get_dexcr(which);
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_CLEAR), "config value not PR_PPC_DEXCR_CTRL_CLEAR");
+ FAIL_IF_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_SET_ONEXEC), "config value not PR_PPC_DEXCR_CTRL_SET_ONEXEC");
+ FAIL_IF_MSG(aspect & mfspr(SPRN_DEXCR_RO), "process aspect should be clear");
+
+ /* Verify the onexec value is applied across exec */
+ pid = fork();
+ if (!pid) {
+ char which_str[32] = {};
+ char *args[] = { "dexcr_prctl_onexec_test_child", which_str, "set", NULL };
+ unsigned int ctrl = pr_get_dexcr(which);
+
+ sprintf(which_str, "%lu", which);
+
+ FAIL_IF_EXIT_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_SET_ONEXEC),
+ "setting aspect on exec not copied across fork");
+
+ FAIL_IF_EXIT_MSG(mfspr(SPRN_DEXCR_RO) & aspect,
+ "setting aspect on exec wrongly applied to fork");
+
+ execve("/proc/self/exe", args, NULL);
+ _exit(errno);
+ }
+ await_child_success(pid);
+
+ err = pr_set_dexcr(which, PR_PPC_DEXCR_CTRL_SET | PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC);
+ FAIL_IF_MSG(err, "PR_PPC_DEXCR_CTRL_SET | PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC failed");
+
+ pid = fork();
+ if (!pid) {
+ char which_str[32] = {};
+ char *args[] = { "dexcr_prctl_onexec_test_child", which_str, "clear", NULL };
+ unsigned int ctrl = pr_get_dexcr(which);
+
+ sprintf(which_str, "%lu", which);
+
+ FAIL_IF_EXIT_MSG(!(ctrl & PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC),
+ "clearing aspect on exec not copied across fork");
+
+ FAIL_IF_EXIT_MSG(!(mfspr(SPRN_DEXCR_RO) & aspect),
+ "clearing aspect on exec wrongly applied to fork");
+
+ execve("/proc/self/exe", args, NULL);
+ _exit(errno);
+ }
+ await_child_success(pid);
+
+ return 0;
+}
+
+static int dexcr_prctl_ibrtpd_test(void)
+{
+ return dexcr_prctl_aspect_test(PR_PPC_DEXCR_IBRTPD);
+}
+
+static int dexcr_prctl_srapd_test(void)
+{
+ return dexcr_prctl_aspect_test(PR_PPC_DEXCR_SRAPD);
+}
+
+static int dexcr_prctl_nphie_test(void)
+{
+ return dexcr_prctl_aspect_test(PR_PPC_DEXCR_NPHIE);
+}
+
+int main(int argc, char *argv[])
+{
+ int err = 0;
+
+ /*
+ * Some tests require checking what happens across exec, so we may be
+ * invoked as the child of a particular test
+ */
+ if (argc > 1) {
+ if (argc == 3 && !strcmp(argv[0], "dexcr_prctl_onexec_test_child")) {
+ unsigned long which;
+
+ err = parse_ulong(argv[1], strlen(argv[1]), &which, 10);
+ FAIL_IF_MSG(err, "failed to parse which value for child");
+
+ return dexcr_prctl_onexec_test_child(which, argv[2]);
+ }
+
+ FAIL_IF_MSG(true, "unknown test case");
+ }
+
+ /*
+ * Otherwise we are the main test invocation and run the full suite
+ */
+ err |= test_harness(dexcr_prctl_ibrtpd_test, "dexcr_prctl_ibrtpd");
+ err |= test_harness(dexcr_prctl_srapd_test, "dexcr_prctl_srapd");
+ err |= test_harness(dexcr_prctl_nphie_test, "dexcr_prctl_nphie");
+
+ return err;
+}
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