[prev in list] [next in list] [prev in thread] [next in thread]
List: linux-api
Subject: [PATCH v18 5/7] x86/cet/ibt: Update arch_prctl functions for Indirect Branch Tracking
From: Yu-cheng Yu <yu-cheng.yu () intel ! com>
Date: 2021-01-27 21:30:26
Message-ID: 20210127213028.11362-6-yu-cheng.yu () intel ! com
[Download RAW message or body]
From: "H.J. Lu" <hjl.tools@gmail.com>
Update ARCH_X86_CET_STATUS and ARCH_X86_CET_DISABLE for Indirect Branch
Tracking.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
---
arch/x86/kernel/cet_prctl.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/kernel/cet_prctl.c b/arch/x86/kernel/cet_prctl.c
index b26531608ae5..7ced08da8c37 100644
--- a/arch/x86/kernel/cet_prctl.c
+++ b/arch/x86/kernel/cet_prctl.c
@@ -22,6 +22,9 @@ static int copy_status_to_user(struct cet_status *cet, u64 arg2)
buf[2] = (u64)cet->shstk_size;
}
+ if (cet->ibt_enabled)
+ buf[0] |= GNU_PROPERTY_X86_FEATURE_1_IBT;
+
return copy_to_user((u64 __user *)arg2, buf, sizeof(buf));
}
@@ -56,6 +59,8 @@ int prctl_cet(int option, u64 arg2)
return -EINVAL;
if (features & GNU_PROPERTY_X86_FEATURE_1_SHSTK)
cet_disable_shstk();
+ if (features & GNU_PROPERTY_X86_FEATURE_1_IBT)
+ cet_disable_ibt();
return 0;
case ARCH_X86_CET_LOCK:
--
2.21.0
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic