diff mbox series

[v3,32/37] x86/cet/shstk: Wire in CET interface

Message ID 20221104223604.29615-33-rick.p.edgecombe@intel.com (mailing list archive)
State New
Headers show
Series Shadow stacks for userspace | expand

Commit Message

Edgecombe, Rick P Nov. 4, 2022, 10:35 p.m. UTC 
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 mbox series

Patch

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;
 }