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Commit 31f75bfe authored by John Johansen's avatar John Johansen
Browse files

apparmor: make computing policy hashes conditional on kernel parameter 



Allow turning off the computation of the policy hashes via the
apparmor.hash_policy kernel parameter.

Signed-off-by: default avatarJohn Johansen <john.johansen@canonical.com>
parent aa9a39ad

security/apparmor/lsm.c

+23 −23
Original line number Diff line number Diff line
@@ -166,42 +166,42 @@ static int common_perm(const char *op, const struct path *path, u32 mask, 
}



/**

 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry

 * common_perm_cond - common permission wrapper around inode cond

 * @op: operation being checked

 * @dir: directory of the dentry  (NOT NULL)

 * @dentry: dentry to check  (NOT NULL)

 * @path: location to check (NOT NULL)

 * @mask: requested permissions mask

 * @cond: conditional info for the permission request  (NOT NULL)

 *

 * Returns: %0 else error code if error or permission denied

 */

static int common_perm_dir_dentry(const char *op, const struct path *dir,

				  struct dentry *dentry, u32 mask,

				  struct path_cond *cond)

static int common_perm_cond(const char *op, const struct path *path, u32 mask)

{

	struct path path = { .mnt = dir->mnt, .dentry = dentry };

	struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,

				  d_backing_inode(path->dentry)->i_mode

	};



	return common_perm(op, &path, mask, cond);

	if (!path_mediated_fs(path->dentry))

		return 0;



	return common_perm(op, path, mask, &cond);

}



/**

 * common_perm_path - common permission wrapper when mnt, dentry

 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry

 * @op: operation being checked

 * @path: location to check (NOT NULL)

 * @dir: directory of the dentry  (NOT NULL)

 * @dentry: dentry to check  (NOT NULL)

 * @mask: requested permissions mask

 * @cond: conditional info for the permission request  (NOT NULL)

 *

 * Returns: %0 else error code if error or permission denied

 */

static inline int common_perm_path(const char *op, const struct path *path,

				   u32 mask)

static int common_perm_dir_dentry(const char *op, const struct path *dir,

				  struct dentry *dentry, u32 mask,

				  struct path_cond *cond)

{

	struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,

				  d_backing_inode(path->dentry)->i_mode

	};

	if (!path_mediated_fs(path->dentry))

		return 0;

	struct path path = { .mnt = dir->mnt, .dentry = dentry };



	return common_perm(op, path, mask, &cond);

	return common_perm(op, &path, mask, cond);

}



/**
@@ -274,7 +274,7 @@ static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, 


static int apparmor_path_truncate(const struct path *path)

{

	return common_perm_path(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE);

	return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE);

}



static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
@@ -333,17 +333,17 @@ static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_d 


static int apparmor_path_chmod(const struct path *path, umode_t mode)

{

	return common_perm_path(OP_CHMOD, path, AA_MAY_CHMOD);

	return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);

}



static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)

{

	return common_perm_path(OP_CHOWN, path, AA_MAY_CHOWN);

	return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);

}



static int apparmor_inode_getattr(const struct path *path)

{

	return common_perm_path(OP_GETATTR, path, AA_MAY_META_READ);

	return common_perm_cond(OP_GETATTR, path, AA_MAY_META_READ);

}



static int apparmor_file_open(struct file *file, const struct cred *cred)

security/apparmor/policy_unpack.c

+9 −6
Original line number Diff line number Diff line
@@ -825,6 +825,7 @@ int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, 
		if (error)

			goto fail_profile;



		if (aa_g_hash_policy)

			error = aa_calc_profile_hash(profile, e.version, start,

						     e.pos - start);

		if (error)
@@ -841,12 +842,14 @@ int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, 
		list_add_tail(&ent->list, lh);

	}

	udata->abi = e.version & K_ABI_MASK;

	if (aa_g_hash_policy) {

		udata->hash = aa_calc_hash(udata->data, udata->size);

		if (IS_ERR(udata->hash)) {

			error = PTR_ERR(udata->hash);

			udata->hash = NULL;

			goto fail;

		}

	}

	return 0;



fail_profile: