diff options
| author | Sami Tolvanen <samitolvanen@google.com> | 2018-05-10 14:56:41 -0700 |
|---|---|---|
| committer | Sami Tolvanen <samitolvanen@google.com> | 2018-05-11 08:40:07 -0700 |
| commit | c2f9bce9fee8e31e0500c501076f73db7791d8e9 (patch) | |
| tree | e2dcb0e2ef71769957799afbd83f90414d572467 | |
| parent | c4048b20ffc5e8c35ec1b90032dd6aa35926225a (diff) | |
ANDROID: ftrace: fix function type mismatches
This change fixes indirect call mismatches with function and function
graph tracing, which trip Control-Flow Integrity (CFI) checking.
Bug: 79510107
Bug: 67506682
Change-Id: I5de08c113fb970ffefedce93c58e0161f22c7ca2
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
| -rw-r--r-- | include/linux/ftrace.h | 8 | ||||
| -rw-r--r-- | kernel/trace/ftrace.c | 17 |
2 files changed, 19 insertions, 6 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index f4c0d36baffb..ab7938a58ca0 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -244,8 +244,16 @@ static inline int ftrace_function_local_disabled(struct ftrace_ops *ops) return *this_cpu_ptr(ops->disabled); } +#ifdef CONFIG_CFI_CLANG +/* Use a C stub with the correct type for CFI */ +static inline void ftrace_stub(unsigned long a0, unsigned long a1, + struct ftrace_ops *op, struct pt_regs *regs) +{ +} +#else extern void ftrace_stub(unsigned long a0, unsigned long a1, struct ftrace_ops *op, struct pt_regs *regs); +#endif #else /* !CONFIG_FUNCTION_TRACER */ /* diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 063dd229bd36..5534be18797e 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -120,8 +120,9 @@ static void ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct pt_regs *regs); #else /* See comment below, where ftrace_ops_list_func is defined */ -static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip); -#define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops) +static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct pt_regs *regs); +#define ftrace_ops_list_func ftrace_ops_no_ops #endif /* @@ -5309,7 +5310,8 @@ static void ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip, __ftrace_ops_list_func(ip, parent_ip, NULL, regs); } #else -static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip) +static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct pt_regs *regs) { __ftrace_ops_list_func(ip, parent_ip, NULL, NULL); } @@ -5735,14 +5737,17 @@ void ftrace_graph_graph_time_control(bool enable) fgraph_graph_time = enable; } +void ftrace_graph_return_stub(struct ftrace_graph_ret *trace) +{ +} + int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace) { return 0; } /* The callbacks that hook a function */ -trace_func_graph_ret_t ftrace_graph_return = - (trace_func_graph_ret_t)ftrace_stub; +trace_func_graph_ret_t ftrace_graph_return = ftrace_graph_return_stub; trace_func_graph_ent_t ftrace_graph_entry = ftrace_graph_entry_stub; static trace_func_graph_ent_t __ftrace_graph_entry = ftrace_graph_entry_stub; @@ -5970,7 +5975,7 @@ void unregister_ftrace_graph(void) goto out; ftrace_graph_active--; - ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub; + ftrace_graph_return = ftrace_graph_return_stub; ftrace_graph_entry = ftrace_graph_entry_stub; __ftrace_graph_entry = ftrace_graph_entry_stub; ftrace_shutdown(&graph_ops, FTRACE_STOP_FUNC_RET); |