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Message-Id: <1156362635.6662.50.camel@localhost.localdomain>
Date: Wed, 23 Aug 2006 15:50:35 -0400
From: Eric Paris <eparis@...hat.com>
To: akpm@...l.org, linux-kernel@...r.kernel.org
Cc: sds@...ho.nsa.gov, James Morris <jmorris@...hat.com>
Subject: [PATCH] SELinux: 2/3 change isec semaphore to a mutex
This patch converts the remaining isec->sem into a mutex. Very similar
locking is provided as before only in the faster smaller mutex rather
than a semaphore. An out_unlock path is introduced rather than the
conditional unlocking found in the original code.
This is being targeted for 2.6.19
Signed-off-by: Eric Paris <eparis@...hat.com>
Acked-by: Stephen Smalley <sds@...ho.nsa.gov>
security/selinux/hooks.c | 30 ++++++++++++++----------------
security/selinux/include/objsec.h | 2 +-
2 files changed, 15 insertions(+), 17 deletions(-)
--- linux-2.6-sem-changes/security/selinux/include/objsec.h.patch2 2006-07-28 12:59:55.000000000 -0400
+++ linux-2.6-sem-changes/security/selinux/include/objsec.h 2006-08-03 16:52:56.000000000 -0400
@@ -44,7 +44,7 @@ struct inode_security_struct {
u32 sid; /* SID of this object */
u16 sclass; /* security class of this object */
unsigned char initialized; /* initialization flag */
- struct semaphore sem;
+ struct mutex lock;
unsigned char inherit; /* inherit SID from parent entry */
};
--- linux-2.6-sem-changes/security/selinux/hooks.c.patch2 2006-07-28 12:59:55.000000000 -0400
+++ linux-2.6-sem-changes/security/selinux/hooks.c 2006-08-04 10:59:22.000000000 -0400
@@ -69,6 +69,7 @@
#include <linux/audit.h>
#include <linux/string.h>
#include <linux/selinux.h>
+#include <linux/mutex.h>
#include "avc.h"
#include "objsec.h"
@@ -182,7 +183,7 @@ static int inode_alloc_security(struct i
return -ENOMEM;
memset(isec, 0, sizeof(*isec));
- init_MUTEX(&isec->sem);
+ mutex_init(&isec->lock);
INIT_LIST_HEAD(&isec->list);
isec->inode = inode;
isec->sid = SECINITSID_UNLABELED;
@@ -843,15 +844,13 @@ static int inode_doinit_with_dentry(stru
char *context = NULL;
unsigned len = 0;
int rc = 0;
- int hold_sem = 0;
if (isec->initialized)
goto out;
- down(&isec->sem);
- hold_sem = 1;
+ mutex_lock(&isec->lock);
if (isec->initialized)
- goto out;
+ goto out_unlock;
sbsec = inode->i_sb->s_security;
if (!sbsec->initialized) {
@@ -862,7 +861,7 @@ static int inode_doinit_with_dentry(stru
if (list_empty(&isec->list))
list_add(&isec->list, &sbsec->isec_head);
spin_unlock(&sbsec->isec_lock);
- goto out;
+ goto out_unlock;
}
switch (sbsec->behavior) {
@@ -885,7 +884,7 @@ static int inode_doinit_with_dentry(stru
printk(KERN_WARNING "%s: no dentry for dev=%s "
"ino=%ld\n", __FUNCTION__, inode->i_sb->s_id,
inode->i_ino);
- goto out;
+ goto out_unlock;
}
len = INITCONTEXTLEN;
@@ -893,7 +892,7 @@ static int inode_doinit_with_dentry(stru
if (!context) {
rc = -ENOMEM;
dput(dentry);
- goto out;
+ goto out_unlock;
}
rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
context, len);
@@ -903,7 +902,7 @@ static int inode_doinit_with_dentry(stru
NULL, 0);
if (rc < 0) {
dput(dentry);
- goto out;
+ goto out_unlock;
}
kfree(context);
len = rc;
@@ -911,7 +910,7 @@ static int inode_doinit_with_dentry(stru
if (!context) {
rc = -ENOMEM;
dput(dentry);
- goto out;
+ goto out_unlock;
}
rc = inode->i_op->getxattr(dentry,
XATTR_NAME_SELINUX,
@@ -924,7 +923,7 @@ static int inode_doinit_with_dentry(stru
"%d for dev=%s ino=%ld\n", __FUNCTION__,
-rc, inode->i_sb->s_id, inode->i_ino);
kfree(context);
- goto out;
+ goto out_unlock;
}
/* Map ENODATA to the default file SID */
sid = sbsec->def_sid;
@@ -960,7 +959,7 @@ static int inode_doinit_with_dentry(stru
isec->sclass,
&sid);
if (rc)
- goto out;
+ goto out_unlock;
isec->sid = sid;
break;
case SECURITY_FS_USE_MNTPOINT:
@@ -978,7 +977,7 @@ static int inode_doinit_with_dentry(stru
isec->sclass,
&sid);
if (rc)
- goto out;
+ goto out_unlock;
isec->sid = sid;
}
}
@@ -987,12 +986,11 @@ static int inode_doinit_with_dentry(stru
isec->initialized = 1;
+out_unlock:
+ mutex_unlock(&isec->lock);
out:
if (isec->sclass == SECCLASS_FILE)
isec->sclass = inode_mode_to_security_class(inode->i_mode);
-
- if (hold_sem)
- up(&isec->sem);
return rc;
}
-
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