diff mbox series

[3/6] riscv: Add ftrace_stub_graph

Message ID 20230629234244.1752366-11-samitolvanen@google.com
State New
Headers
Series riscv: KCFI support |

Commit Message

Sami Tolvanen June 29, 2023, 11:42 p.m. UTC 
  Commit 883bbbffa5a4 ("ftrace,kcfi: Separate ftrace_stub() and
ftrace_stub_graph()") added a separate ftrace_stub_graph function for
CFI_CLANG. Add the stub to fix FUNCTION_GRAPH_TRACER compatibility
with CFI.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
 arch/riscv/kernel/mcount.S | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Kees Cook June 30, 2023, 6:25 p.m. UTC | #1 
On Thu, Jun 29, 2023 at 11:42:48PM +0000, Sami Tolvanen wrote:
> Commit 883bbbffa5a4 ("ftrace,kcfi: Separate ftrace_stub() and
> ftrace_stub_graph()") added a separate ftrace_stub_graph function for
> CFI_CLANG. Add the stub to fix FUNCTION_GRAPH_TRACER compatibility
> with CFI.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

Reviewed-by: Kees Cook <keescook@chromium.org>
diff mbox series

Patch

diff --git a/arch/riscv/kernel/mcount.S b/arch/riscv/kernel/mcount.S
index 712c1d2c2723..c73d7514e45f 100644
--- a/arch/riscv/kernel/mcount.S
+++ b/arch/riscv/kernel/mcount.S
@@ -57,6 +57,10 @@  SYM_TYPED_FUNC_START(ftrace_stub)
 SYM_FUNC_END(ftrace_stub)
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
+SYM_TYPED_FUNC_START(ftrace_stub_graph)
+	ret
+SYM_FUNC_END(ftrace_stub_graph)
+
 ENTRY(return_to_handler)
 /*
  * On implementing the frame point test, the ideal way is to compare the