Hi, On x86 platforms Linux uses FS register to keep the data segment register with which access user segment register. If a sys_call is made and the kernel needs to copy data from user space then FS will have the value USER_DS. Many kernel functions copy or return data from/to user space. In order to use the same functions to copy/return data from/to kernel space you need to do the followings: mm_segment_t* old_fs; old_fs = get_fs(); set_fs(KERNEL_DS); /* call the kernel functions */ set_fs(old_fs); - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
