1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index 67ebf5751222..c439ec478216 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -349,6 +349,12 @@ static __user void *task_get_bounds_dir(struct task_struct *tsk)
                 return MPX_INVALID_BOUNDS_DIR;
 
         /*
+         * 32-bit binaries on 64-bit kernels are currently
+         * unsupported.
+         */
+        if (IS_ENABLED(CONFIG_X86_64) && test_thread_flag(TIF_IA32))
+                return MPX_INVALID_BOUNDS_DIR;
+        /*
          * The bounds directory pointer is stored in a register
          * only accessible if we first do an xsave.
          */