commit 3842ba494963b1d76ad5f68b8d1e5c2279160e31
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Tue Jun 1 09:23:40 2021 +0100
 
    aarch64: align stack in clone [BZ #27939]
    
    The AArch64 PCS requires 16 byte aligned stack.  Previously if the
    caller passed an unaligned stack to clone then the child crashed.
    
    Fixes bug 27939.
 
diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S
index e0653048259dd9a3..4a1a999447ee5cf1 100644
--- a/sysdeps/unix/sysv/linux/aarch64/clone.S
+++ b/sysdeps/unix/sysv/linux/aarch64/clone.S
@@ -48,6 +48,8 @@ ENTRY(__clone)
 	/* Sanity check args.  */
 	mov	x0, #-EINVAL
 	cbz	x10, .Lsyscall_error
+	/* Align sp.  */
+	and	x1, x1, -16
 	cbz	x1, .Lsyscall_error
 
 	/* Do the system call.  */