linux-kernel - [PATCH 1/7] tracehooks: kill some PT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20091218011120.GA29538@redhat.com>
Date:	Fri, 18 Dec 2009 02:11:20 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Ananth Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, utrace-devel@...hat.com
Subject: [PATCH 1/7] tracehooks: kill some PT_PTRACED checks

No functional changes, preparation for utrace-ptrace.

task_ptrace() != 0 if and only if PT_PTRACED bit is set, kill
some PT_PTRACED checks in tracehook.h to ensure the result is
the same with or without utrace which doesn't set PT_PTRACED.

Signed-off-by: Roland McGrath <roland@...hat.com>
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---

 include/linux/tracehook.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- V1/include/linux/tracehook.h~1_TRACEHOOK_KILL_PTRACED_CHECKS	2009-12-18 00:20:50.000000000 +0100
+++ V1/include/linux/tracehook.h	2009-12-18 00:38:09.000000000 +0100
@@ -156,7 +156,7 @@ static inline int tracehook_unsafe_exec(
 {
 	int unsafe = 0;
 	int ptrace = task_ptrace(task);
-	if (ptrace & PT_PTRACED) {
+	if (ptrace) {
 		if (ptrace & PT_PTRACE_CAP)
 			unsafe |= LSM_UNSAFE_PTRACE_CAP;
 		else
@@ -178,7 +178,7 @@ static inline int tracehook_unsafe_exec(
  */
 static inline struct task_struct *tracehook_tracer_task(struct task_struct *tsk)
 {
-	if (task_ptrace(tsk) & PT_PTRACED)
+	if (task_ptrace(tsk))
 		return rcu_dereference(tsk->parent);
 	return NULL;
 }
@@ -492,7 +492,7 @@ static inline int tracehook_get_signal(s
  */
 static inline int tracehook_notify_jctl(int notify, int why)
 {
-	return notify ?: (current->ptrace & PT_PTRACED) ? why : 0;
+	return notify ?: task_ptrace(current) ? why : 0;
 }
 
 /**

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/