Add a simple fake_sigreturn testcase which builds a ucontext_t with an anomalous additional fpsimd_context and place it onto the stack. Expects a SIGSEGV on test PASS.
Signed-off-by: Cristian Marussi cristian.marussi@arm.com --- v3 --> v4 - fix commit - missing include - using new get_starting_head() helper - added test description --- .../fake_sigreturn_duplicated_fpsimd.c | 52 +++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_duplicated_fpsimd.c
diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_duplicated_fpsimd.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_duplicated_fpsimd.c new file mode 100644 index 000000000000..c7122c44f53f --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_duplicated_fpsimd.c @@ -0,0 +1,52 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 ARM Limited + * + * Place a fake sigframe on the stack including an additional FPSIMD + * record: on sigreturn Kernel must spot this attempt and the test + * case is expected to be terminated via SEGV. + */ + +#include <signal.h> +#include <ucontext.h> + +#include "test_signals_utils.h" +#include "testcases.h" + +struct fake_sigframe sf; + +static int fake_sigreturn_duplicated_fpsimd_run(struct tdescr *td, + siginfo_t *si, ucontext_t *uc) +{ + size_t resv_sz, need_sz; + struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head; + + /* just to fill the ucontext_t with something real */ + if (!get_current_context(td, &sf.uc)) + return 1; + + resv_sz = GET_SF_RESV_SIZE(sf); + need_sz = HDR_SZ + sizeof(struct fpsimd_context); + + head = get_starting_head(shead, need_sz, resv_sz, NULL); + if (head) { + /* Add a spurios fpsimd_context */ + head->magic = FPSIMD_MAGIC; + head->size = sizeof(struct fpsimd_context); + /* and terminate */ + write_terminator_record(GET_RESV_NEXT_HEAD(head)); + + ASSERT_BAD_CONTEXT(&sf.uc); + fake_sigreturn(&sf, sizeof(sf), 0); + } + + return 1; +} + +struct tdescr tde = { + .name = "FAKE_SIGRETURN_DUPLICATED_FPSIMD", + .descr = "Triggers a sigreturn including two fpsimd_context", + .sig_ok = SIGSEGV, + .timeout = 3, + .run = fake_sigreturn_duplicated_fpsimd_run, +};