On Fri, Aug 02, 2019 at 06:02:56PM +0100, Cristian Marussi wrote:
Added a simple fake_sigreturn testcase which builds a ucontext_t
Add
with a badly sized magic0 header and place it onto the stack.
I usually call a record with magic number 0 a "terminator record".
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 <signal.h> ?
+#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;
This is different from the amount of space we tested for (HDR_SZ + MIN_SZ_ALIGN) earlier.
I'm not sure it matters which we use, but we should be consistent.
I suggest sticking with HDR_SZ, unless there's something I've missed.
[...]
Cheers ---Dave