The patch titled
SELinux: change isec semaphore to a mutex
has been removed from the -mm tree. Its filename is
selinux-2-3-change-isec-semaphore-to-a-mutex.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: SELinux: change isec semaphore to a mutex
From: Eric Paris <eparis@xxxxxxxxxx>
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@xxxxxxxxxx>
Acked-by: Stephen Smalley <sds@xxxxxxxxxxxxx>
Acked-by: James Morris <jmorris@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
security/selinux/hooks.c | 30 +++++++++++++---------------
security/selinux/include/objsec.h | 2 -
security/selinux/ss/services.c | 4 +--
3 files changed, 17 insertions(+), 19 deletions(-)
diff -puN security/selinux/hooks.c~selinux-2-3-change-isec-semaphore-to-a-mutex security/selinux/hooks.c
--- a/security/selinux/hooks.c~selinux-2-3-change-isec-semaphore-to-a-mutex
+++ a/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 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;
}
diff -puN security/selinux/include/objsec.h~selinux-2-3-change-isec-semaphore-to-a-mutex security/selinux/include/objsec.h
--- a/security/selinux/include/objsec.h~selinux-2-3-change-isec-semaphore-to-a-mutex
+++ a/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 -puN security/selinux/ss/services.c~selinux-2-3-change-isec-semaphore-to-a-mutex security/selinux/ss/services.c
--- a/security/selinux/ss/services.c~selinux-2-3-change-isec-semaphore-to-a-mutex
+++ a/security/selinux/ss/services.c
@@ -2578,7 +2578,7 @@ int selinux_netlbl_inode_permission(stru
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(stru
release_sock(sock->sk);
} else
rc = 0;
- up(&isec->sem);
+ mutex_unlock(&isec->lock);
return rc;
}
_
Patches currently in -mm which might be from eparis@xxxxxxxxxx are
origin.patch
-
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