[PATCH v5 09/11] x86/vsyscall/32: Add ENDBR32 to vsyscall entry point

From: Yu-cheng Yu
Date: Thu Oct 11 2018 - 11:22:29 EST


From: "H.J. Lu" <hjl.tools@xxxxxxxxx>

Add ENDBR32 to vsyscall entry point.

Signed-off-by: H.J. Lu <hjl.tools@xxxxxxxxx>
---
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