[NTOS:KE:X64] Zero out volatiles when returning from a system call

2026-08-29 12:23:30 +00:00 · 2020-10-31 14:23:16 +01:00
parent a016ccd117
commit 1bfacf06f7
1 changed files with 10 additions and 0 deletions
@@ -824,6 +824,16 @@ IntsEnabled:
    /* Swap gs back to user */
    swapgs

+    ; Zero out volatiles
+    pxor xmm0, xmm0
+    pxor xmm1, xmm1
+    pxor xmm2, xmm2
+    pxor xmm3, xmm3
+    pxor xmm4, xmm4
+    pxor xmm5, xmm5
+    xor rdx, rdx
+    xor r10, r10
+
    /* return to user mode */
    .byte HEX(48) // REX prefix to return to long mode
    sysret