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Message-ID: <alpine.LRH.2.00.0905071951530.29219@tundra.namei.org>
Date: Thu, 7 May 2009 19:54:24 +1000 (EST)
From: James Morris <jmorris@...ei.org>
To: Chris Wright <chrisw@...s-sol.org>
cc: Ingo Molnar <mingo@...e.hu>, Oleg Nesterov <oleg@...hat.com>,
Roland McGrath <roland@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, Al Viro <viro@...IV.linux.org.uk>,
linux-security-module@...r.kernel.org
On Thu, 7 May 2009, Chris Wright wrote:
> * Ingo Molnar (mingo@...e.hu) wrote:
[Added LSM list to the CC; please do so whenever making changes in this
area...]
> > They have no active connection to the core kernel
> > ptrace_may_access() check in any case:
>
> Not sure what you mean:
>
> ptrace_may_access
> __ptrace_may_access
> security_ptrace_may_access
>
> Looks like your patch won't compile.
>
Below is an updated version which fixes the bug, against
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
Boot tested with SELinux.
commit c4c79671177dc3e8387c337f75f3c664cdf08838
Author: Ingo Molnar <mingo@...e.hu>
Date: Thu May 7 19:26:19 2009 +1000
security: rename ptrace_may_access => ptrace_access_check
The ->ptrace_may_access() methods are named confusingly - the real
ptrace_may_access() returns a bool, while these security checks have
a retval convention.
Rename it to ptrace_access_check, to reduce the confusion factor.
[ Impact: cleanup, no code changed ]
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: James Morris <jmorris@...ei.org>
diff --git a/include/linux/security.h b/include/linux/security.h
index 54ed157..0147def 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -51,7 +51,7 @@ struct audit_krule;
extern int cap_capable(struct task_struct *tsk, const struct cred *cred,
int cap, int audit);
extern int cap_settime(struct timespec *ts, struct timezone *tz);
-extern int cap_ptrace_may_access(struct task_struct *child, unsigned int mode);
+extern int cap_ptrace_access_check(struct task_struct *child, unsigned int mode);
extern int cap_ptrace_traceme(struct task_struct *parent);
extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
extern int cap_capset(struct cred *new, const struct cred *old,
@@ -1208,7 +1208,7 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @alter contains the flag indicating whether changes are to be made.
* Return 0 if permission is granted.
*
- * @ptrace_may_access:
+ * @ptrace_access_check:
* Check permission before allowing the current process to trace the
* @child process.
* Security modules may also want to perform a process tracing check
@@ -1223,7 +1223,7 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* Check that the @parent process has sufficient permission to trace the
* current process before allowing the current process to present itself
* to the @parent process for tracing.
- * The parent process will still have to undergo the ptrace_may_access
+ * The parent process will still have to undergo the ptrace_access_check
* checks before it is allowed to trace this one.
* @parent contains the task_struct structure for debugger process.
* Return 0 if permission is granted.
@@ -1335,7 +1335,7 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
struct security_operations {
char name[SECURITY_NAME_MAX + 1];
- int (*ptrace_may_access) (struct task_struct *child, unsigned int mode);
+ int (*ptrace_access_check) (struct task_struct *child, unsigned int mode);
int (*ptrace_traceme) (struct task_struct *parent);
int (*capget) (struct task_struct *target,
kernel_cap_t *effective,
@@ -1616,7 +1616,7 @@ extern int security_module_enable(struct security_operations *ops);
extern int register_security(struct security_operations *ops);
/* Security operations */
-int security_ptrace_may_access(struct task_struct *child, unsigned int mode);
+int security_ptrace_access_check(struct task_struct *child, unsigned int mode);
int security_ptrace_traceme(struct task_struct *parent);
int security_capget(struct task_struct *target,
kernel_cap_t *effective,
@@ -1797,10 +1797,10 @@ static inline int security_init(void)
return 0;
}
-static inline int security_ptrace_may_access(struct task_struct *child,
+static inline int security_ptrace_access_check(struct task_struct *child,
unsigned int mode)
{
- return cap_ptrace_may_access(child, mode);
+ return cap_ptrace_access_check(child, mode);
}
static inline int security_ptrace_traceme(struct task_struct *parent)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index c9cf48b..284d0ac 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -160,7 +160,7 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode)
if (!dumpable && !capable(CAP_SYS_PTRACE))
return -EPERM;
- return security_ptrace_may_access(task, mode);
+ return security_ptrace_access_check(task, mode);
}
bool ptrace_may_access(struct task_struct *task, unsigned int mode)
diff --git a/security/capability.c b/security/capability.c
index 21b6cea..f218dd3 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -863,7 +863,7 @@ struct security_operations default_security_ops = {
void security_fixup_ops(struct security_operations *ops)
{
- set_to_cap_if_null(ops, ptrace_may_access);
+ set_to_cap_if_null(ops, ptrace_access_check);
set_to_cap_if_null(ops, ptrace_traceme);
set_to_cap_if_null(ops, capget);
set_to_cap_if_null(ops, capset);
diff --git a/security/commoncap.c b/security/commoncap.c
index 97ac1f1..e57611a 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -101,7 +101,7 @@ int cap_settime(struct timespec *ts, struct timezone *tz)
}
/**
- * cap_ptrace_may_access - Determine whether the current process may access
+ * cap_ptrace_access_check - Determine whether the current process may access
* another
* @child: The process to be accessed
* @mode: The mode of attachment.
@@ -109,7 +109,7 @@ int cap_settime(struct timespec *ts, struct timezone *tz)
* Determine whether a process may access another, returning 0 if permission
* granted, -ve if denied.
*/
-int cap_ptrace_may_access(struct task_struct *child, unsigned int mode)
+int cap_ptrace_access_check(struct task_struct *child, unsigned int mode)
{
int ret = 0;
diff --git a/security/root_plug.c b/security/root_plug.c
index 40fb4f1..e8d5861 100644
--- a/security/root_plug.c
+++ b/security/root_plug.c
@@ -72,7 +72,7 @@ static int rootplug_bprm_check_security (struct linux_binprm *bprm)
static struct security_operations rootplug_security_ops = {
/* Use the capability functions for some of the hooks */
- .ptrace_may_access = cap_ptrace_may_access,
+ .ptrace_access_check = cap_ptrace_access_check,
.ptrace_traceme = cap_ptrace_traceme,
.capget = cap_capget,
.capset = cap_capset,
diff --git a/security/security.c b/security/security.c
index 206e538..a3e6918 100644
--- a/security/security.c
+++ b/security/security.c
@@ -127,9 +127,9 @@ int register_security(struct security_operations *ops)
/* Security operations */
-int security_ptrace_may_access(struct task_struct *child, unsigned int mode)
+int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
{
- return security_ops->ptrace_may_access(child, mode);
+ return security_ops->ptrace_access_check(child, mode);
}
int security_ptrace_traceme(struct task_struct *parent)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 39046dd..e30c4bb 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1854,12 +1854,12 @@ static inline u32 open_file_to_av(struct file *file)
/* Hook functions begin here. */
-static int selinux_ptrace_may_access(struct task_struct *child,
+static int selinux_ptrace_access_check(struct task_struct *child,
unsigned int mode)
{
int rc;
- rc = cap_ptrace_may_access(child, mode);
+ rc = cap_ptrace_access_check(child, mode);
if (rc)
return rc;
@@ -5310,7 +5310,7 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer)
static struct security_operations selinux_ops = {
.name = "selinux",
- .ptrace_may_access = selinux_ptrace_may_access,
+ .ptrace_access_check = selinux_ptrace_access_check,
.ptrace_traceme = selinux_ptrace_traceme,
.capget = selinux_capget,
.capset = selinux_capset,
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index f557767..79949f9 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -91,7 +91,7 @@ struct inode_smack *new_inode_smack(char *smack)
*/
/**
- * smack_ptrace_may_access - Smack approval on PTRACE_ATTACH
+ * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
* @ctp: child task pointer
* @mode: ptrace attachment mode
*
@@ -99,13 +99,13 @@ struct inode_smack *new_inode_smack(char *smack)
*
* Do the capability checks, and require read and write.
*/
-static int smack_ptrace_may_access(struct task_struct *ctp, unsigned int mode)
+static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
{
int rc;
struct smk_audit_info ad;
char *sp, *tsp;
- rc = cap_ptrace_may_access(ctp, mode);
+ rc = cap_ptrace_access_check(ctp, mode);
if (rc != 0)
return rc;
@@ -3031,7 +3031,7 @@ static void smack_release_secctx(char *secdata, u32 seclen)
struct security_operations smack_ops = {
.name = "smack",
- .ptrace_may_access = smack_ptrace_may_access,
+ .ptrace_access_check = smack_ptrace_access_check,
.ptrace_traceme = smack_ptrace_traceme,
.capget = cap_capget,
.capset = cap_capset,
--
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