Messages in this thread Patch in this message | | | From | Yu-cheng Yu <> | Subject | [PATCH v19 5/7] x86/cet/ibt: Update arch_prctl functions for Indirect Branch Tracking | Date | Wed, 3 Feb 2021 14:59:00 -0800 |
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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 0030c63a08c0..4df1eac41965 100644 --- a/arch/x86/kernel/cet_prctl.c +++ b/arch/x86/kernel/cet_prctl.c @@ -22,6 +22,9 @@ static int cet_copy_status_to_user(struct cet_status *cet, u64 __user *ubuf) buf[2] = cet->shstk_size; } + if (cet->ibt_enabled) + buf[0] |= GNU_PROPERTY_X86_FEATURE_1_IBT; + return copy_to_user(ubuf, buf, sizeof(buf)); } @@ -46,6 +49,8 @@ int prctl_cet(int option, u64 arg2) return -EINVAL; if (arg2 & GNU_PROPERTY_X86_FEATURE_1_SHSTK) cet_disable_shstk(); + if (arg2 & GNU_PROPERTY_X86_FEATURE_1_IBT) + cet_disable_ibt(); return 0; case ARCH_X86_CET_LOCK: -- 2.21.0
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