diff mbox series

[v8,06/14] x86/cet/ibt: Add arch_prctl functions for IBT

Message ID 20190813205359.12196-7-yu-cheng.yu@intel.com (mailing list archive)
State New, archived
Headers show
Series Control-flow Enforcement: Branch Tracking, PTRACE | expand

Commit Message

Yu-cheng Yu Aug. 13, 2019, 8:53 p.m. UTC 
From: "H.J. Lu" <hjl.tools@gmail.com>

Update ARCH_X86_CET_STATUS and ARCH_X86_CET_DISABLE to include
Indirect Branch Tracking features.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
---
 arch/x86/include/uapi/asm/prctl.h | 2 ++
 arch/x86/kernel/cet_prctl.c       | 4 ++++
 2 files changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/include/uapi/asm/prctl.h b/arch/x86/include/uapi/asm/prctl.h
index d962f0ec9ccf..02243127dcf6 100644
--- a/arch/x86/include/uapi/asm/prctl.h
+++ b/arch/x86/include/uapi/asm/prctl.h
@@ -18,5 +18,7 @@ 
 #define ARCH_X86_CET_DISABLE		0x3002
 #define ARCH_X86_CET_LOCK		0x3003
 #define ARCH_X86_CET_ALLOC_SHSTK	0x3004
+#define ARCH_X86_CET_GET_LEGACY_BITMAP	0x3005 /* deprecated */
+#define ARCH_X86_CET_SET_LEGACY_BITMAP	0x3006 /* deprecated */
 
 #endif /* _ASM_X86_PRCTL_H */
diff --git a/arch/x86/kernel/cet_prctl.c b/arch/x86/kernel/cet_prctl.c
index 9c9d4262b07e..09d8c4ea935c 100644
--- a/arch/x86/kernel/cet_prctl.c
+++ b/arch/x86/kernel/cet_prctl.c
@@ -20,6 +20,8 @@  static int handle_get_status(unsigned long arg2)
 
 	if (current->thread.cet.shstk_enabled)
 		features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
+	if (current->thread.cet.ibt_enabled)
+		features |= GNU_PROPERTY_X86_FEATURE_1_IBT;
 
 	shstk_base = current->thread.cet.shstk_base;
 	shstk_size = current->thread.cet.shstk_size;
@@ -69,6 +71,8 @@  int prctl_cet(int option, unsigned long arg2)
 			return -EPERM;
 		if (arg2 & GNU_PROPERTY_X86_FEATURE_1_SHSTK)
 			cet_disable_free_shstk(current);
+		if (arg2 & GNU_PROPERTY_X86_FEATURE_1_IBT)
+			cet_disable_ibt();
 
 		return 0;