BACKPORT: x86/ptrace: run seccomp after ptrace

This moves seccomp after ptrace on x86 to that seccomp can catch changes
made by ptrace. Emulation should skip the rest of processing too.

We can get rid of test_thread_flag because there's no longer any
opportunity for seccomp to mess with ptrace state before invoking
ptrace.

Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: x86@kernel.org
Cc: Andy Lutomirski <luto@kernel.org>
(cherry picked from commit 93e35efb8de45393cf61ed07f7b407629bf698ea)

Bug: 119769499
Change-Id: Ie1b9a18360799e68e22f67ce6a819c93433fdeaa
[ghackmann@google.com: adjust context]
Signed-off-by: Greg Hackmann <ghackmann@google.com>

arch/x86/entry/common.c

@@ -73,6 +73,7 @@ long syscall_trace_enter(struct pt_regs *regs)
 
 	struct thread_info *ti = pt_regs_to_thread_info(regs);
 	unsigned long ret = 0;
+	bool emulated = false;
 	u32 work;
 
 	if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
@@ -101,11 +102,19 @@ long syscall_trace_enter(struct pt_regs *regs)
 	if (work & _TIF_SINGLESTEP)
 		regs->flags |= X86_EFLAGS_TF;
 
+	if (unlikely(work & _TIF_SYSCALL_EMU))
+		emulated = true;
+
+	if ((emulated || (work & _TIF_SYSCALL_TRACE)) &&
+	    tracehook_report_syscall_entry(regs))
+		return -1L;
+
+	if (emulated)
+		return -1L;
+
 #ifdef CONFIG_SECCOMP
 	/*
-	 * Do seccomp first -- it should minimize exposure of other
-	 * code, and keeping seccomp fast is probably more valuable
-	 * than the rest of this.
+	 * Do seccomp after ptrace, to catch any tracer changes.
 	 */
 	if (work & _TIF_SECCOMP) {
 		struct seccomp_data sd;
@@ -138,13 +147,6 @@ long syscall_trace_enter(struct pt_regs *regs)
 	}
 #endif
 
-	if (unlikely(work & _TIF_SYSCALL_EMU))
-		ret = -1L;
-
-	if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) &&
-	    tracehook_report_syscall_entry(regs))
-		ret = -1L;
-
 	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 		trace_sys_enter(regs, regs->orig_ax);