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authorMark Brown <broonie@kernel.org>2021-08-19 14:42:43 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2021-08-23 11:11:05 +0100
commitd25ac50ce8f742e61fad6175cdbb172532ebfd10 (patch)
tree3e9ca4943d61550eabc83af013a470305fc86836 /tools
parentkselftest/arm64: signal: Check SVE signal frame shows expected vector length (diff)
downloadlinux-dev-d25ac50ce8f742e61fad6175cdbb172532ebfd10.tar.xz
linux-dev-d25ac50ce8f742e61fad6175cdbb172532ebfd10.zip
kselftest/arm64: signal: Verify that signals can't change the SVE vector length
We do not support changing the SVE vector length as part of signal return, verify that this is the case if the system supports multiple vector lengths. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20210819134245.13935-5-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_sve_change_vl.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_sve_change_vl.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_sve_change_vl.c
new file mode 100644
index 000000000000..bb50b5adbf10
--- /dev/null
+++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_sve_change_vl.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 ARM Limited
+ *
+ * Attempt to change the SVE vector length in a signal hander, this is not
+ * supported and is expected to segfault.
+ */
+
+#include <signal.h>
+#include <ucontext.h>
+#include <sys/prctl.h>
+
+#include "test_signals_utils.h"
+#include "testcases.h"
+
+struct fake_sigframe sf;
+static unsigned int vls[SVE_VQ_MAX];
+unsigned int nvls = 0;
+
+static bool sve_get_vls(struct tdescr *td)
+{
+ int vq, vl;
+
+ /*
+ * Enumerate up to SVE_VQ_MAX vector lengths
+ */
+ for (vq = SVE_VQ_MAX; vq > 0; --vq) {
+ vl = prctl(PR_SVE_SET_VL, vq * 16);
+ if (vl == -1)
+ return false;
+
+ vl &= PR_SVE_VL_LEN_MASK;
+
+ /* Skip missing VLs */
+ vq = sve_vq_from_vl(vl);
+
+ vls[nvls++] = vl;
+ }
+
+ /* We need at least two VLs */
+ if (nvls < 2) {
+ fprintf(stderr, "Only %d VL supported\n", nvls);
+ return false;
+ }
+
+ return true;
+}
+
+static int fake_sigreturn_sve_change_vl(struct tdescr *td,
+ siginfo_t *si, ucontext_t *uc)
+{
+ size_t resv_sz, offset;
+ struct _aarch64_ctx *head = GET_SF_RESV_HEAD(sf);
+ struct sve_context *sve;
+
+ /* Get a signal context with a SVE frame in it */
+ if (!get_current_context(td, &sf.uc))
+ return 1;
+
+ resv_sz = GET_SF_RESV_SIZE(sf);
+ head = get_header(head, SVE_MAGIC, resv_sz, &offset);
+ if (!head) {
+ fprintf(stderr, "No SVE context\n");
+ return 1;
+ }
+
+ if (head->size != sizeof(struct sve_context)) {
+ fprintf(stderr, "SVE register state active, skipping\n");
+ return 1;
+ }
+
+ sve = (struct sve_context *)head;
+
+ /* No changes are supported; init left us at minimum VL so go to max */
+ fprintf(stderr, "Attempting to change VL from %d to %d\n",
+ sve->vl, vls[0]);
+ sve->vl = vls[0];
+
+ fake_sigreturn(&sf, sizeof(sf), 0);
+
+ return 1;
+}
+
+struct tdescr tde = {
+ .name = "FAKE_SIGRETURN_SVE_CHANGE",
+ .descr = "Attempt to change SVE VL",
+ .feats_required = FEAT_SVE,
+ .sig_ok = SIGSEGV,
+ .timeout = 3,
+ .init = sve_get_vls,
+ .run = fake_sigreturn_sve_change_vl,
+};