X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/a39ff7e25e19b3a8c3020042a3872ca9ec9659f1..9d749ea394c01276fa19e397e70f46858e849c76:/osfmk/arm64/locore.s

diff --git a/osfmk/arm64/locore.s b/osfmk/arm64/locore.s
index 4430d3b5c..376e90195 100644
--- a/osfmk/arm64/locore.s
+++ b/osfmk/arm64/locore.s
@@ -400,6 +400,7 @@ Lel1_sp1_serror_vector_long:
 	b		fleh_dispatch64
 
 .macro EL0_64_VECTOR
+	mov		x18, xzr						// Zero x18 to avoid leaking data to user SS
 	stp		x0, x1, [sp, #-16]!					// Save x0 and x1 to the exception stack
 	mrs		x0, TPIDR_EL1						// Load the thread register
 	mrs		x1, SP_EL0							// Load the user stack pointer