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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2011-07-08 13:25:53 +0900
committerJames Morris <jmorris@namei.org>2011-07-11 11:05:34 +1000
commit97fb35e413f256ded07b88c73b3d932ec31ea84e (patch)
treed16cb1dcb6d16938aa01c071fdcd1cbbf85b5153 /security
parent5b636857fee642694e287e3a181b523b16098c93 (diff)
downloadlinux-linaro-precise-97fb35e413f256ded07b88c73b3d932ec31ea84e.tar.gz
TOMOYO: Enable conditional ACL.
Enable conditional ACL by passing object's pointers. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/tomoyo/common.h3
-rw-r--r--security/tomoyo/domain.c53
-rw-r--r--security/tomoyo/file.c35
-rw-r--r--security/tomoyo/mount.c8
-rw-r--r--security/tomoyo/tomoyo.c14
5 files changed, 80 insertions, 33 deletions
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index 6c013b17779..f7fbaa66e44 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -836,7 +836,8 @@ int tomoyo_path2_perm(const u8 operation, struct path *path1,
struct path *path2);
int tomoyo_path_number_perm(const u8 operation, struct path *path,
unsigned long number);
-int tomoyo_path_perm(const u8 operation, struct path *path);
+int tomoyo_path_perm(const u8 operation, struct path *path,
+ const char *target);
int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
const struct tomoyo_path_info *filename);
int tomoyo_poll_control(struct file *file, poll_table *wait);
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 565249c42e3..878d0206f43 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -575,23 +575,27 @@ out:
*/
int tomoyo_find_next_domain(struct linux_binprm *bprm)
{
- struct tomoyo_request_info r;
- char *tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
struct tomoyo_domain_info *old_domain = tomoyo_domain();
struct tomoyo_domain_info *domain = NULL;
const char *original_name = bprm->filename;
- u8 mode;
- bool is_enforce;
int retval = -ENOMEM;
bool need_kfree = false;
bool reject_on_transition_failure = false;
struct tomoyo_path_info rn = { }; /* real name */
-
- mode = tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE);
- is_enforce = (mode == TOMOYO_CONFIG_ENFORCING);
- if (!tmp)
- goto out;
-
+ struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS);
+ if (!ee)
+ return -ENOMEM;
+ ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
+ if (!ee->tmp) {
+ kfree(ee);
+ return -ENOMEM;
+ }
+ /* ee->dump->data is allocated by tomoyo_dump_page(). */
+ tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE);
+ ee->r.ee = ee;
+ ee->bprm = bprm;
+ ee->r.obj = &ee->obj;
+ ee->obj.path1 = bprm->file->f_path;
retry:
if (need_kfree) {
kfree(rn.name);
@@ -625,7 +629,7 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
}
/* Check execute permission. */
- retval = tomoyo_path_permission(&r, TOMOYO_TYPE_EXECUTE, &rn);
+ retval = tomoyo_path_permission(&ee->r, TOMOYO_TYPE_EXECUTE, &rn);
if (retval == TOMOYO_RETRY_REQUEST)
goto retry;
if (retval < 0)
@@ -636,12 +640,12 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
* wildcard) rather than the pathname passed to execve()
* (which never contains wildcard).
*/
- if (r.param.path.matched_path) {
+ if (ee->r.param.path.matched_path) {
if (need_kfree)
kfree(rn.name);
need_kfree = false;
/* This is OK because it is read only. */
- rn = *r.param.path.matched_path;
+ rn = *ee->r.param.path.matched_path;
}
/* Calculate domain to transit to. */
@@ -649,7 +653,7 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
&rn)) {
case TOMOYO_TRANSITION_CONTROL_RESET:
/* Transit to the root of specified namespace. */
- snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", rn.name);
+ snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", rn.name);
/*
* Make do_execve() fail if domain transition across namespaces
* has failed.
@@ -658,7 +662,7 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
break;
case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
/* Transit to the child of current namespace's root. */
- snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+ snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
old_domain->ns->name, rn.name);
break;
case TOMOYO_TRANSITION_CONTROL_KEEP:
@@ -677,29 +681,30 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
domain = old_domain;
} else {
/* Normal domain transition. */
- snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+ snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
old_domain->domainname->name, rn.name);
}
break;
}
if (!domain)
- domain = tomoyo_assign_domain(tmp, true);
+ domain = tomoyo_assign_domain(ee->tmp, true);
if (domain)
retval = 0;
else if (reject_on_transition_failure) {
- printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", tmp);
+ printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n",
+ ee->tmp);
retval = -ENOMEM;
- } else if (r.mode == TOMOYO_CONFIG_ENFORCING)
+ } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING)
retval = -ENOMEM;
else {
retval = 0;
if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) {
old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true;
- r.granted = false;
- tomoyo_write_log(&r, "%s", tomoyo_dif
+ ee->r.granted = false;
+ tomoyo_write_log(&ee->r, "%s", tomoyo_dif
[TOMOYO_DIF_TRANSITION_FAILED]);
printk(KERN_WARNING
- "ERROR: Domain '%s' not defined.\n", tmp);
+ "ERROR: Domain '%s' not defined.\n", ee->tmp);
}
}
out:
@@ -710,7 +715,9 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
bprm->cred->security = domain;
if (need_kfree)
kfree(rn.name);
- kfree(tmp);
+ kfree(ee->tmp);
+ kfree(ee->dump.data);
+ kfree(ee);
return retval;
}
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 6ab9e4cdd61..31a9a4ab7af 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -667,6 +667,9 @@ int tomoyo_path_number_perm(const u8 type, struct path *path,
unsigned long number)
{
struct tomoyo_request_info r;
+ struct tomoyo_obj_info obj = {
+ .path1 = *path,
+ };
int error = -ENOMEM;
struct tomoyo_path_info buf;
int idx;
@@ -677,6 +680,7 @@ int tomoyo_path_number_perm(const u8 type, struct path *path,
idx = tomoyo_read_lock();
if (!tomoyo_get_realpath(&buf, path))
goto out;
+ r.obj = &obj;
if (type == TOMOYO_TYPE_MKDIR)
tomoyo_add_slash(&buf);
r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
@@ -711,6 +715,9 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
int error = 0;
struct tomoyo_path_info buf;
struct tomoyo_request_info r;
+ struct tomoyo_obj_info obj = {
+ .path1 = *path,
+ };
int idx;
buf.name = NULL;
@@ -723,6 +730,7 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
error = -ENOMEM;
goto out;
}
+ r.obj = &obj;
if (acc_mode & MAY_READ)
error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ,
&buf);
@@ -745,15 +753,21 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
*
* @operation: Type of operation.
* @path: Pointer to "struct path".
+ * @target: Symlink's target if @operation is TOMOYO_TYPE_SYMLINK,
+ * NULL otherwise.
*
* Returns 0 on success, negative value otherwise.
*/
-int tomoyo_path_perm(const u8 operation, struct path *path)
+int tomoyo_path_perm(const u8 operation, struct path *path, const char *target)
{
struct tomoyo_request_info r;
+ struct tomoyo_obj_info obj = {
+ .path1 = *path,
+ };
int error;
struct tomoyo_path_info buf;
bool is_enforce;
+ struct tomoyo_path_info symlink_target;
int idx;
if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
@@ -765,13 +779,23 @@ int tomoyo_path_perm(const u8 operation, struct path *path)
idx = tomoyo_read_lock();
if (!tomoyo_get_realpath(&buf, path))
goto out;
+ r.obj = &obj;
switch (operation) {
case TOMOYO_TYPE_RMDIR:
case TOMOYO_TYPE_CHROOT:
tomoyo_add_slash(&buf);
break;
+ case TOMOYO_TYPE_SYMLINK:
+ symlink_target.name = tomoyo_encode(target);
+ if (!symlink_target.name)
+ goto out;
+ tomoyo_fill_path_info(&symlink_target);
+ obj.symlink_target = &symlink_target;
+ break;
}
error = tomoyo_path_permission(&r, operation, &buf);
+ if (operation == TOMOYO_TYPE_SYMLINK)
+ kfree(symlink_target.name);
out:
kfree(buf.name);
tomoyo_read_unlock(idx);
@@ -794,6 +818,9 @@ int tomoyo_mkdev_perm(const u8 operation, struct path *path,
const unsigned int mode, unsigned int dev)
{
struct tomoyo_request_info r;
+ struct tomoyo_obj_info obj = {
+ .path1 = *path,
+ };
int error = -ENOMEM;
struct tomoyo_path_info buf;
int idx;
@@ -804,6 +831,7 @@ int tomoyo_mkdev_perm(const u8 operation, struct path *path,
idx = tomoyo_read_lock();
error = -ENOMEM;
if (tomoyo_get_realpath(&buf, path)) {
+ r.obj = &obj;
dev = new_decode_dev(dev);
r.param_type = TOMOYO_TYPE_MKDEV_ACL;
r.param.mkdev.filename = &buf;
@@ -837,6 +865,10 @@ int tomoyo_path2_perm(const u8 operation, struct path *path1,
struct tomoyo_path_info buf1;
struct tomoyo_path_info buf2;
struct tomoyo_request_info r;
+ struct tomoyo_obj_info obj = {
+ .path1 = *path1,
+ .path2 = *path2,
+ };
int idx;
if (tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
@@ -861,6 +893,7 @@ int tomoyo_path2_perm(const u8 operation, struct path *path1,
tomoyo_add_slash(&buf2);
break;
}
+ r.obj = &obj;
r.param_type = TOMOYO_TYPE_PATH2_ACL;
r.param.path2.operation = operation;
r.param.path2.filename1 = &buf1;
diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c
index 0bbba8b6782..40838530747 100644
--- a/security/tomoyo/mount.c
+++ b/security/tomoyo/mount.c
@@ -75,6 +75,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
struct path *dir, const char *type,
unsigned long flags)
{
+ struct tomoyo_obj_info obj = { };
struct path path;
struct file_system_type *fstype = NULL;
const char *requested_type = NULL;
@@ -85,6 +86,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
struct tomoyo_path_info rdir;
int need_dev = 0;
int error = -ENOMEM;
+ r->obj = &obj;
/* Get fstype. */
requested_type = tomoyo_encode(type);
@@ -94,6 +96,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
tomoyo_fill_path_info(&rtype);
/* Get mount point. */
+ obj.path2 = *dir;
requested_dir_name = tomoyo_realpath_from_path(dir);
if (!requested_dir_name) {
error = -ENOMEM;
@@ -129,8 +132,8 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
error = -ENOENT;
goto out;
}
+ obj.path1 = path;
requested_dev_name = tomoyo_realpath_from_path(&path);
- path_put(&path);
if (!requested_dev_name) {
error = -ENOENT;
goto out;
@@ -163,6 +166,9 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
if (fstype)
put_filesystem(fstype);
kfree(requested_type);
+ /* Drop refcount obtained by kern_path(). */
+ if (obj.path1.dentry)
+ path_put(&obj.path1);
return error;
}
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index d6f68a0ec2d..a536cb182c0 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -98,18 +98,18 @@ static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
static int tomoyo_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
{
struct path path = { mnt, dentry };
- return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path);
+ return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path, NULL);
}
static int tomoyo_path_truncate(struct path *path)
{
- return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path);
+ return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
}
static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry)
{
struct path path = { parent->mnt, dentry };
- return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path);
+ return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
}
static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
@@ -123,14 +123,14 @@ static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry)
{
struct path path = { parent->mnt, dentry };
- return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path);
+ return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
}
static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry,
const char *old_name)
{
struct path path = { parent->mnt, dentry };
- return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path);
+ return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
}
static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
@@ -225,7 +225,7 @@ static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
static int tomoyo_path_chroot(struct path *path)
{
- return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path);
+ return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
}
static int tomoyo_sb_mount(char *dev_name, struct path *path,
@@ -237,7 +237,7 @@ static int tomoyo_sb_mount(char *dev_name, struct path *path,
static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
{
struct path path = { mnt, mnt->mnt_root };
- return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path);
+ return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
}
static int tomoyo_sb_pivotroot(struct path *old_path, struct path *new_path)