# \[RFC PATCH v6 09/11\] x86/vsyscall/32: Add ENDBR32 to vsyscall entry point

- From: Yu-cheng Yu \<hidden\>
- Date: 2018-11-19 21:55:28 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2018/11/5438532
- Thread: https://ratatoskr.run/linux-doc/2018/11/5438521/t.md

```text
From: "H.J. Lu" <redacted>

Add ENDBR32 to vsyscall entry point.

Signed-off-by: H.J. Lu <redacted>
---
 arch/x86/entry/vdso/vdso32/system_call.S | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/entry/vdso/vdso32/system_call.S b/arch/x86/entry/vdso/vdso32/system_call.S
index 263d7433dea8..2fc8141fff4e 100644
--- a/arch/x86/entry/vdso/vdso32/system_call.S
+++ b/arch/x86/entry/vdso/vdso32/system_call.S
@@ -14,6 +14,9 @@
 	ALIGN
 __kernel_vsyscall:
 	CFI_STARTPROC
+#ifdef CONFIG_X86_INTEL_BRANCH_TRACKING_USER
+	endbr32
+#endif
 	/*
 	 * Reshuffle regs so that all of any of the entry instructions
 	 * will preserve enough state.
-- 
2.17.1
```