x86: copy_fpstate_to_sigframe(): have fpregs_soft_get() use kernel buffer (36c8673f) · Commits · 戴 / test

arch/x86/kernel/fpu/signal.c

+6 −6

Original line number	Diff line number	Diff line
		@@ -170,14 +170,14 @@ int copy_fpstate_to_sigframe(void __user buf, void __user buf_fx, int size)
		ia32_fxstate &= (IS_ENABLED(CONFIG_X86_32) \|\|
		IS_ENABLED(CONFIG_IA32_EMULATION));

		if (!static_cpu_has(X86_FEATURE_FPU)) {
		struct user_i387_ia32_struct fp;
		fpregs_soft_get(current, NULL, 0, sizeof(fp), &fp, NULL);
		return copy_to_user(buf, &fp, sizeof(fp)) ? -EFAULT : 0;
		}

		if (!access_ok(buf, size))
		return -EACCES;

		if (!static_cpu_has(X86_FEATURE_FPU))
		return fpregs_soft_get(current, NULL, 0,
		sizeof(struct user_i387_ia32_struct), NULL,
		(struct _fpstate_32 __user *) buf) ? -1 : 1;

		retry:
		/*
		* Load the FPU registers if they are not valid for the current task.