Added a simple fake_sigreturn testcase which builds a ucontext_t with a badly sized header and place it onto the stack. Expects a SIGSEGV on test PASS.
Signed-off-by: Cristian Marussi cristian.marussi@arm.com --- .../arm64/signal/testcases/.gitignore | 1 + .../testcases/fake_sigreturn_bad_size.c | 40 +++++++++++++++++++ 2 files changed, 41 insertions(+) create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size.c
diff --git a/tools/testing/selftests/arm64/signal/testcases/.gitignore b/tools/testing/selftests/arm64/signal/testcases/.gitignore index c353b7bd899d..9ad1735e0018 100644 --- a/tools/testing/selftests/arm64/signal/testcases/.gitignore +++ b/tools/testing/selftests/arm64/signal/testcases/.gitignore @@ -8,3 +8,4 @@ mangle_pstate_invalid_mode_el3 mangle_pstate_ssbs_regs fake_sigreturn_misaligned fake_sigreturn_bad_magic +fake_sigreturn_bad_size diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size.c new file mode 100644 index 000000000000..d54f79d63bf6 --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size.c @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2019 ARM Limited */ + +#include <asm/sigcontext.h> +#include <ucontext.h> + +#include "test_signals_utils.h" +#include "testcases.h" + +struct a_sigframe sf; + +static int fake_sigreturn_bad_size_run(struct tdescr *td, + siginfo_t *si, ucontext_t *uc) +{ + struct _aarch64_ctx *head = GET_SF_RESV_HEAD(sf); + + /* just to fill the ucontext_t with something real */ + if (!get_current_context(td, &sf.uc)) + return 1; + + /* Tampering size to an unplausible number should cause a SEGV */ + head = get_terminator(head, GET_SF_RESV_SIZE(sf), NULL); + if (head) { + head->magic = ESR_MAGIC; + head->size = GET_SF_RESV_SIZE(sf) * 2; + + ASSERT_BAD_CONTEXT(&sf.uc); + fake_sigreturn(&sf, sizeof(sf), 16); + } + + return 1; +} + +struct tdescr tde = { + .name = "FAKE_SIGRETURN_BAD_SIZE", + .descr = "Triggers a fake sigreturn with a sigframe including a bad sized head on __reserved", + .sig_ok = SIGSEGV, + .timeout = 3, + .run = fake_sigreturn_bad_size_run, +};