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authorEric Paris <eparis@redhat.com>2006-09-25 23:32:01 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-26 08:48:53 -0700
commit23970741720360de9dd0a4e87fbeb1d5927aa474 (patch)
tree2dc28ddfeae751a673d43e1925fd131d6ed3e222 /security
parent296fddf7513c155adbd3a443d12add1f62b5cddb (diff)
downloadlinux-linaro-stable-23970741720360de9dd0a4e87fbeb1d5927aa474.tar.gz
[PATCH] SELinux: 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. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: James Morris <jmorris@namei.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/hooks.c30
-rw-r--r--security/selinux/include/objsec.h2
-rw-r--r--security/selinux/ss/services.c4
3 files changed, 17 insertions, 19 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 14a78199ee1f..63ad57ab44fc 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -71,6 +71,7 @@
#include <linux/audit.h>
#include <linux/string.h>
#include <linux/selinux.h>
+#include <linux/mutex.h>
#include "avc.h"
#include "objsec.h"
@@ -185,7 +186,7 @@ static int inode_alloc_security(struct inode *inode)
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(struct inode *inode, struct dentry *opt_dent
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(struct inode *inode, struct dentry *opt_dent
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(struct inode *inode, struct dentry *opt_dent
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(struct inode *inode, struct dentry *opt_dent
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(struct inode *inode, struct dentry *opt_dent
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(struct inode *inode, struct dentry *opt_dent
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(struct inode *inode, struct dentry *opt_dent
"%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(struct inode *inode, struct dentry *opt_dent
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(struct inode *inode, struct dentry *opt_dent
isec->sclass,
&sid);
if (rc)
- goto out;
+ goto out_unlock;
isec->sid = sid;
}
}
@@ -987,12 +986,11 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
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;
}
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index 0a39bfd1319f..7d5a0289878b 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -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 */
};
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 988079f45294..0c219a1b3243 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -2578,7 +2578,7 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
sock = SOCKET_I(inode);
isec = inode->i_security;
sksec = sock->sk->sk_security;
- down(&isec->sem);
+ mutex_lock(&isec->lock);
if (unlikely(sksec->nlbl_state == NLBL_REQUIRE &&
(mask & (MAY_WRITE | MAY_APPEND)))) {
lock_sock(sock->sk);
@@ -2586,7 +2586,7 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
release_sock(sock->sk);
} else
rc = 0;
- up(&isec->sem);
+ mutex_unlock(&isec->lock);
return rc;
}