linux-kernel - [PATCH 4.14 101/146] ptrace: Remove unused ptrace_may_access_sched() and MODE

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Date:   Tue,  4 Dec 2018 11:49:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jiri Kosina <jkosina@...e.cz>,
        Tom Lendacky <thomas.lendacky@....com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Casey Schaufler <casey.schaufler@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>,
        Waiman Long <longman9394@...il.com>,
        Dave Stewart <david.c.stewart@...el.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH 4.14 101/146] ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner tglx@...utronix.de

commit 46f7ecb1e7359f183f5bbd1e08b90e10e52164f9 upstream

The IBPB control code in x86 removed the usage. Remove the functionality
which was introduced for this.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Casey Schaufler <casey.schaufler@...el.com>
Cc: Asit Mallick <asit.k.mallick@...el.com>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Jon Masters <jcm@...hat.com>
Cc: Waiman Long <longman9394@...il.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Dave Stewart <david.c.stewart@...el.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/20181125185005.559149393@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/ptrace.h |   17 -----------------
 kernel/ptrace.c        |   10 ----------
 2 files changed, 27 deletions(-)

--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -64,15 +64,12 @@ extern void exit_ptrace(struct task_stru
 #define PTRACE_MODE_NOAUDIT	0x04
 #define PTRACE_MODE_FSCREDS	0x08
 #define PTRACE_MODE_REALCREDS	0x10
-#define PTRACE_MODE_SCHED	0x20
-#define PTRACE_MODE_IBPB	0x40
 
 /* shorthands for READ/ATTACH and FSCREDS/REALCREDS combinations */
 #define PTRACE_MODE_READ_FSCREDS (PTRACE_MODE_READ | PTRACE_MODE_FSCREDS)
 #define PTRACE_MODE_READ_REALCREDS (PTRACE_MODE_READ | PTRACE_MODE_REALCREDS)
 #define PTRACE_MODE_ATTACH_FSCREDS (PTRACE_MODE_ATTACH | PTRACE_MODE_FSCREDS)
 #define PTRACE_MODE_ATTACH_REALCREDS (PTRACE_MODE_ATTACH | PTRACE_MODE_REALCREDS)
-#define PTRACE_MODE_SPEC_IBPB (PTRACE_MODE_ATTACH_REALCREDS | PTRACE_MODE_IBPB)
 
 /**
  * ptrace_may_access - check whether the caller is permitted to access
@@ -90,20 +87,6 @@ extern void exit_ptrace(struct task_stru
  */
 extern bool ptrace_may_access(struct task_struct *task, unsigned int mode);
 
-/**
- * ptrace_may_access - check whether the caller is permitted to access
- * a target task.
- * @task: target task
- * @mode: selects type of access and caller credentials
- *
- * Returns true on success, false on denial.
- *
- * Similar to ptrace_may_access(). Only to be called from context switch
- * code. Does not call into audit and the regular LSM hooks due to locking
- * constraints.
- */
-extern bool ptrace_may_access_sched(struct task_struct *task, unsigned int mode);
-
 static inline int ptrace_reparented(struct task_struct *child)
 {
 	return !same_thread_group(child->real_parent, child->parent);
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -261,9 +261,6 @@ static int ptrace_check_attach(struct ta
 
 static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode)
 {
-	if (mode & PTRACE_MODE_SCHED)
-		return false;
-
 	if (mode & PTRACE_MODE_NOAUDIT)
 		return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE);
 	else
@@ -331,16 +328,9 @@ ok:
 	     !ptrace_has_cap(mm->user_ns, mode)))
 	    return -EPERM;
 
-	if (mode & PTRACE_MODE_SCHED)
-		return 0;
 	return security_ptrace_access_check(task, mode);
 }
 
-bool ptrace_may_access_sched(struct task_struct *task, unsigned int mode)
-{
-	return __ptrace_may_access(task, mode | PTRACE_MODE_SCHED);
-}
-
 bool ptrace_may_access(struct task_struct *task, unsigned int mode)
 {
 	int err;