1 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86/include/uapi/asm/ldt.h b/arch/x86/include/uapi/asm/ldt.h
index 46727eb37bfe..6e1aaf73852a 100644
--- a/arch/x86/include/uapi/asm/ldt.h
+++ b/arch/x86/include/uapi/asm/ldt.h
@@ -28,6 +28,13 @@ struct user_desc {
         unsigned int  seg_not_present:1;
         unsigned int  useable:1;
 #ifdef __x86_64__
+        /*
+         * Because this bit is not present in 32-bit user code, user
+         * programs can pass uninitialized values here.  Therefore, in
+         * any context in which a user_desc comes from a 32-bit program,
+         * the kernel must act as though lm == 0, regardless of the
+         * actual value.
+         */
         unsigned int  lm:1;
 #endif
 };