Added a simple fake_sigreturn testcase which builds a ucontext_t with a badly sized magic0 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 + .../fake_sigreturn_bad_size_for_magic0.c | 57 +++++++++++++++++++ 2 files changed, 58 insertions(+) create mode 100644 tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c
diff --git a/tools/testing/selftests/arm64/signal/testcases/.gitignore b/tools/testing/selftests/arm64/signal/testcases/.gitignore index 0ea6fdc3765c..cf2a73599818 100644 --- a/tools/testing/selftests/arm64/signal/testcases/.gitignore +++ b/tools/testing/selftests/arm64/signal/testcases/.gitignore @@ -5,3 +5,4 @@ mangle_pstate_invalid_mode_el2 mangle_pstate_invalid_mode_el3 mangle_pstate_ssbs_regs fake_sigreturn_bad_magic +fake_sigreturn_bad_size_for_magic0 diff --git a/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c new file mode 100644 index 000000000000..2f53c4740c85 --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_bad_size_for_magic0.c @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2019 ARM Limited */ + +#include <stdio.h> +#include <ucontext.h> + +#include "test_signals_utils.h" +#include "testcases.h" + +struct fake_sigframe sf; + +#define MIN_SZ_ALIGN 16 + +static int fake_sigreturn_bad_size_for_magic0_run(struct tdescr *td, + siginfo_t *si, ucontext_t *uc) +{ + size_t resv_sz, offset; + 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); + /* + * find the terminator, preserving existing headers + * and verify amount of spare room in __reserved area. + */ + head = get_terminator(shead, resv_sz, &offset); + /* + * try stripping extra_context header when low on space: + * we need at least HDR_SZ + 16 space for the bad sized terminator. + */ + if (head && resv_sz - offset < HDR_SZ + MIN_SZ_ALIGN) { + fprintf(stderr, "Low on space:%zd. Discarding extra_context.\n", + resv_sz - offset); + head = get_header(shead, EXTRA_MAGIC, resv_sz, &offset); + } + /* just give up and timeout if still not enough space */ + if (head && resv_sz - offset >= HDR_SZ + MIN_SZ_ALIGN) { + head->magic = 0; + head->size = MIN_SZ_ALIGN; + + ASSERT_BAD_CONTEXT(&sf.uc); + fake_sigreturn(&sf, sizeof(sf), 16); + } + + return 1; +} + +struct tdescr tde = { + .name = "FAKE_SIGRETURN_BAD_SIZE_FOR_MAGIC0", + .descr = "Triggers a fake sigreturn with a sigframe including a bad non-zero size magic0", + .sig_ok = SIGSEGV, + .timeout = 3, + .run = fake_sigreturn_bad_size_for_magic0_run, +};