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From:   Rick Edgecombe <rick.p.edgecombe@intel.com>
To:     x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
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Cc:     rick.p.edgecombe@intel.com
Subject: [PATCH v3 32/37] x86/cet/shstk: Wire in CET interface
Date:   Fri,  4 Nov 2022 15:35:59 -0700
Message-Id: <20221104223604.29615-33-rick.p.edgecombe@intel.com>
In-Reply-To: <20221104223604.29615-1-rick.p.edgecombe@intel.com>
References: <20221104223604.29615-1-rick.p.edgecombe@intel.com>
Precedence: bulk

The kernel now has the main CET functionality to support applications.
Wire in the WRSS and shadow stack enable/disable functions into the
existing CET API skeleton.

Tested-by: Pengfei Xu <pengfei.xu@intel.com>
Tested-by: John Allen <john.allen@amd.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>

---

v2:
 - Split from other patches

 arch/x86/kernel/shstk.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/kernel/shstk.c b/arch/x86/kernel/shstk.c
index cbd0970b26d7..71620b77a654 100644
--- a/arch/x86/kernel/shstk.c
+++ b/arch/x86/kernel/shstk.c
@@ -463,9 +463,17 @@ long cet_prctl(struct task_struct *task, int option, unsigned long features)
 		return -EINVAL;
 
 	if (option == ARCH_CET_DISABLE) {
+		if (features & CET_WRSS)
+			return wrss_control(false);
+		if (features & CET_SHSTK)
+			return shstk_disable();
 		return -EINVAL;
 	}
 
 	/* Handle ARCH_CET_ENABLE */
+	if (features & CET_SHSTK)
+		return shstk_setup();
+	if (features & CET_WRSS)
+		return wrss_control(true);
 	return -EINVAL;
 }
-- 
2.17.1