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authorTobias Huschle <huschle@linux.ibm.com>2022-02-24 16:14:21 +0100
committerVasily Gorbik <gor@linux.ibm.com>2022-03-10 15:58:17 +0100
commitc65f677b62d6180cc174e06f953f7fe860adf6d1 (patch)
tree7e53880569166348d4146f4814461cd7fe991cec /arch/s390/lib
parent63bf38ff5bc3d8cee6c6a089657876d0b669cae1 (diff)
downloadlinux-c65f677b62d6180cc174e06f953f7fe860adf6d1.tar.bz2
s390/test_unwind: add kretprobe tests
Add tests to verify that s390 kretprobes maintain a correct stack chain and ensure their proper function. Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Tobias Huschle <huschle@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/lib')
-rw-r--r--arch/s390/lib/test_unwind.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/s390/lib/test_unwind.c b/arch/s390/lib/test_unwind.c
index 07ef89eeb85a..c01f02887de4 100644
--- a/arch/s390/lib/test_unwind.c
+++ b/arch/s390/lib/test_unwind.c
@@ -132,6 +132,7 @@ static struct unwindme *unwindme;
#define UWM_PGM 0x40 /* Unwind from program check handler */
#define UWM_KPROBE_ON_FTRACE 0x80 /* Unwind from kprobe handler called via ftrace. */
#define UWM_FTRACE 0x100 /* Unwind from ftrace handler. */
+#define UWM_KRETPROBE 0x200 /* Unwind kretprobe handlers. */
static __always_inline unsigned long get_psw_addr(void)
{
@@ -143,6 +144,55 @@ static __always_inline unsigned long get_psw_addr(void)
return psw_addr;
}
+static int kretprobe_ret_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
+{
+ struct unwindme *u = unwindme;
+
+ u->ret = test_unwind(NULL, (u->flags & UWM_REGS) ? regs : NULL,
+ (u->flags & UWM_SP) ? u->sp : 0);
+
+ return 0;
+}
+
+static noinline notrace void test_unwind_kretprobed_func(void)
+{
+ asm volatile(" nop\n");
+}
+
+static noinline void test_unwind_kretprobed_func_caller(void)
+{
+ test_unwind_kretprobed_func();
+}
+
+static int test_unwind_kretprobe(struct unwindme *u)
+{
+ int ret;
+ struct kretprobe my_kretprobe;
+
+ if (!IS_ENABLED(CONFIG_KPROBES))
+ kunit_skip(current_test, "requires CONFIG_KPROBES");
+
+ u->ret = -1; /* make sure kprobe is called */
+ unwindme = u;
+
+ memset(&my_kretprobe, 0, sizeof(my_kretprobe));
+ my_kretprobe.handler = kretprobe_ret_handler;
+ my_kretprobe.maxactive = 1;
+ my_kretprobe.kp.addr = (kprobe_opcode_t *)test_unwind_kretprobed_func;
+
+ ret = register_kretprobe(&my_kretprobe);
+
+ if (ret < 0) {
+ kunit_err(current_test, "register_kretprobe failed %d\n", ret);
+ return -EINVAL;
+ }
+
+ test_unwind_kretprobed_func_caller();
+ unregister_kretprobe(&my_kretprobe);
+ unwindme = NULL;
+ return u->ret;
+}
+
static int kprobe_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
struct unwindme *u = unwindme;
@@ -254,6 +304,8 @@ static noinline int unwindme_func4(struct unwindme *u)
return 0;
} else if (u->flags & (UWM_PGM | UWM_KPROBE_ON_FTRACE)) {
return test_unwind_kprobe(u);
+ } else if (u->flags & (UWM_KRETPROBE)) {
+ return test_unwind_kretprobe(u);
} else if (u->flags & UWM_FTRACE) {
return test_unwind_ftrace(u);
} else {
@@ -396,6 +448,10 @@ static const struct test_params param_list[] = {
TEST_WITH_FLAGS(UWM_FTRACE | UWM_SP),
TEST_WITH_FLAGS(UWM_FTRACE | UWM_REGS),
TEST_WITH_FLAGS(UWM_FTRACE | UWM_SP | UWM_REGS),
+ TEST_WITH_FLAGS(UWM_KRETPROBE),
+ TEST_WITH_FLAGS(UWM_KRETPROBE | UWM_SP),
+ TEST_WITH_FLAGS(UWM_KRETPROBE | UWM_REGS),
+ TEST_WITH_FLAGS(UWM_KRETPROBE | UWM_SP | UWM_REGS),
};
/*