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authorVasily Gorbik <gor@linux.ibm.com>2022-03-05 21:10:49 +0300
committerVasily Gorbik <gor@linux.ibm.com>2022-03-27 23:18:39 +0300
commitafacda5faabdfe0f0e91e89db3ff1dc0b46f669a (patch)
tree3f362fea8af4bd6cf50fd64e9caff0e36f77260d /arch/s390/lib
parent708b13763920ab3c191b31da555f2d90eef4c618 (diff)
downloadlinux-afacda5faabdfe0f0e91e89db3ff1dc0b46f669a.tar.xz
s390/test_unwind: verify __kretprobe_trampoline is replaced
Reviewed-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.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/s390/lib/test_unwind.c b/arch/s390/lib/test_unwind.c
index 468e1ce66a33..9bb067321ab4 100644
--- a/arch/s390/lib/test_unwind.c
+++ b/arch/s390/lib/test_unwind.c
@@ -47,7 +47,7 @@ static void print_backtrace(char *bt)
static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,
unsigned long sp)
{
- int frame_count, prev_is_func2, seen_func2_func1;
+ int frame_count, prev_is_func2, seen_func2_func1, seen_kretprobe_trampoline;
const int max_frames = 128;
struct unwind_state state;
size_t bt_pos = 0;
@@ -63,6 +63,7 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,
frame_count = 0;
prev_is_func2 = 0;
seen_func2_func1 = 0;
+ seen_kretprobe_trampoline = 0;
unwind_for_each_frame(&state, task, regs, sp) {
unsigned long addr = unwind_get_return_address(&state);
char sym[KSYM_SYMBOL_LEN];
@@ -88,6 +89,8 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,
if (prev_is_func2 && str_has_prefix(sym, "unwindme_func1"))
seen_func2_func1 = 1;
prev_is_func2 = str_has_prefix(sym, "unwindme_func2");
+ if (str_has_prefix(sym, "__kretprobe_trampoline+0x0/"))
+ seen_kretprobe_trampoline = 1;
}
/* Check the results. */
@@ -103,6 +106,10 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,
kunit_err(current_test, "Maximum number of frames exceeded\n");
ret = -EINVAL;
}
+ if (seen_kretprobe_trampoline) {
+ kunit_err(current_test, "__kretprobe_trampoline+0x0 in unwinding results\n");
+ ret = -EINVAL;
+ }
if (ret || force_bt)
print_backtrace(bt);
kfree(bt);