Commit 50e04acf authored Jul 13, 2019 by Jann Horn Committed by Thomas Gleixner Jul 17, 2019

x86/process: Delete useless check for dead process with LDT



At release_thread(), ->mm is NULL; and it is fine for the former mm to
still have an LDT. Delete this check in process_64.c, similar to
commit 2684927c ("[PATCH] x86: Deprecate useless bug"), which did the
same in process_32.c.

Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190712224152.13129-1-jannh@google.com

parent 29e7e966

arch/x86/kernel/process_64.c

+1 −11

Original line number	Diff line number	Diff line
		@@ -143,17 +143,7 @@ void __show_regs(struct pt_regs *regs, enum show_regs_mode mode)

		void release_thread(struct task_struct *dead_task)
		{
		if (dead_task->mm) {
		#ifdef CONFIG_MODIFY_LDT_SYSCALL
		if (dead_task->mm->context.ldt) {
		pr_warn("WARNING: dead process %s still has LDT? <%p/%d>\n",
		dead_task->comm,
		dead_task->mm->context.ldt->entries,
		dead_task->mm->context.ldt->nr_entries);
		BUG();
		}
		#endif
		}
		WARN_ON(dead_task->mm);
		}

		enum which_selector {