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apparmor: convert from securityfs to apparmorfs for policy ns files 

Virtualize the apparmor policy/ directory so that the current
namespace affects what part of policy is seen. To do this convert to
using apparmorfs for policy namespace files and setup a magic symlink
in the securityfs apparmor dir to access those files.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Reviewed-by: Seth Arnold <seth.arnold@canonical.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
John Johansen 2017-05-25 06:35:38 -07:00
parent 98407f0a0d
commit c961ee5f21
1 changed files with 37 additions and 26 deletions
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63
security/apparmor/apparmorfs.c
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@ -943,7 +943,7 @@ static void remove_rawdata_dents(struct aa_loaddata *rawdata)
for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
/* no refcounts on i_private */
securityfs_remove(rawdata->dents[i]);
aafs_remove(rawdata->dents[i]);
rawdata->dents[i] = NULL;
}
}
@ -979,33 +979,33 @@ int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
if (!rawdata->name)
return -ENOMEM;
dir = securityfs_create_dir(rawdata->name, ns_subdata_dir(ns));
dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
if (IS_ERR(dir))
/* ->name freed when rawdata freed */
return PTR_ERR(dir);
rawdata->dents[AAFS_LOADDATA_DIR] = dir;
dent = securityfs_create_file("abi", S_IFREG | 0444, dir, rawdata,
dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
&seq_rawdata_abi_fops);
if (IS_ERR(dent))
goto fail;
rawdata->dents[AAFS_LOADDATA_ABI] = dent;
dent = securityfs_create_file("revision", S_IFREG | 0444, dir, rawdata,
dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
&seq_rawdata_revision_fops);
if (IS_ERR(dent))
goto fail;
rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
if (aa_g_hash_policy) {
dent = securityfs_create_file("sha1", S_IFREG | 0444, dir,
dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
rawdata, &seq_rawdata_hash_fops);
if (IS_ERR(dent))
goto fail;
rawdata->dents[AAFS_LOADDATA_HASH] = dent;
}
dent = securityfs_create_file("raw_data", S_IFREG | 0444,
dent = aafs_create_file("raw_data", S_IFREG | 0444,
dir, rawdata, &rawdata_fops);
if (IS_ERR(dent))
goto fail;
@ -1047,7 +1047,7 @@ void __aafs_profile_rmdir(struct aa_profile *profile)
continue;
proxy = d_inode(profile->dents[i])->i_private;
securityfs_remove(profile->dents[i]);
aafs_remove(profile->dents[i]);
aa_put_proxy(proxy);
profile->dents[i] = NULL;
}
@ -1077,7 +1077,7 @@ static struct dentry *create_profile_file(struct dentry *dir, const char *name,
struct aa_proxy *proxy = aa_get_proxy(profile->proxy);
struct dentry *dent;
dent = securityfs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
if (IS_ERR(dent))
aa_put_proxy(proxy);
@ -1130,7 +1130,7 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
p = aa_deref_parent(profile);
dent = prof_dir(p);
/* adding to parent that previously didn't have children */
dent = securityfs_create_dir("profiles", dent);
dent = aafs_create_dir("profiles", dent);
if (IS_ERR(dent))
goto fail;
prof_child_dir(p) = parent = dent;
@ -1151,7 +1151,7 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
}
dent = securityfs_create_dir(profile->dirname, parent);
dent = aafs_create_dir(profile->dirname, parent);
if (IS_ERR(dent))
goto fail;
prof_dir(profile) = dir = dent;
@ -1190,7 +1190,7 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
profile->rawdata->name, "sha1");
if (error < 0)
goto fail2;
dent = securityfs_create_symlink("raw_sha1", dir, target, NULL);
dent = aafs_create_symlink("raw_sha1", dir, target, NULL);
if (IS_ERR(dent))
goto fail;
profile->dents[AAFS_PROF_RAW_HASH] = dent;
@ -1199,7 +1199,7 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
profile->rawdata->name, "abi");
if (error < 0)
goto fail2;
dent = securityfs_create_symlink("raw_abi", dir, target, NULL);
dent = aafs_create_symlink("raw_abi", dir, target, NULL);
if (IS_ERR(dent))
goto fail;
profile->dents[AAFS_PROF_RAW_ABI] = dent;
@ -1208,7 +1208,7 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
profile->rawdata->name, "raw_data");
if (error < 0)
goto fail2;
dent = securityfs_create_symlink("raw_data", dir, target, NULL);
dent = aafs_create_symlink("raw_data", dir, target, NULL);
if (IS_ERR(dent))
goto fail;
profile->dents[AAFS_PROF_RAW_DATA] = dent;
@ -1283,7 +1283,7 @@ void __aafs_ns_rmdir(struct aa_ns *ns)
}
for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
securityfs_remove(ns->dents[i]);
aafs_remove(ns->dents[i]);
ns->dents[i] = NULL;
}
}
@ -1296,38 +1296,38 @@ static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
AA_BUG(!ns);
AA_BUG(!dir);
dent = securityfs_create_dir("profiles", dir);
dent = aafs_create_dir("profiles", dir);
if (IS_ERR(dent))
return PTR_ERR(dent);
ns_subprofs_dir(ns) = dent;
dent = securityfs_create_dir("raw_data", dir);
dent = aafs_create_dir("raw_data", dir);
if (IS_ERR(dent))
return PTR_ERR(dent);
ns_subdata_dir(ns) = dent;
dent = securityfs_create_file(".load", 0640, dir, ns,
dent = aafs_create_file(".load", 0640, dir, ns,
&aa_fs_profile_load);
if (IS_ERR(dent))
return PTR_ERR(dent);
aa_get_ns(ns);
ns_subload(ns) = dent;
dent = securityfs_create_file(".replace", 0640, dir, ns,
dent = aafs_create_file(".replace", 0640, dir, ns,
&aa_fs_profile_replace);
if (IS_ERR(dent))
return PTR_ERR(dent);
aa_get_ns(ns);
ns_subreplace(ns) = dent;
dent = securityfs_create_file(".remove", 0640, dir, ns,
dent = aafs_create_file(".remove", 0640, dir, ns,
&aa_fs_profile_remove);
if (IS_ERR(dent))
return PTR_ERR(dent);
aa_get_ns(ns);
ns_subremove(ns) = dent;
dent = securityfs_create_dir("namespaces", dir);
dent = aafs_create_dir("namespaces", dir);
if (IS_ERR(dent))
return PTR_ERR(dent);
aa_get_ns(ns);
@ -1354,11 +1354,13 @@ int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
if (!name)
name = ns->base.name;
/* create ns dir if it doesn't already exist */
dent = securityfs_create_dir(name, parent);
if (IS_ERR(dent))
goto fail;
if (!dent) {
/* create ns dir if it doesn't already exist */
dent = aafs_create_dir(name, parent);
if (IS_ERR(dent))
goto fail;
} else
dget(dent);
ns_dir(ns) = dir = dent;
error = __aafs_ns_mkdir_entries(ns, dir);
if (error)
@ -1930,12 +1932,21 @@ static int __init aa_create_aafs(void)
ns_subremove(root_ns) = dent;
mutex_lock(&root_ns->lock);
error = __aafs_ns_mkdir(root_ns, aa_sfs_entry.dentry, "policy", NULL);
error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
aafs_mnt->mnt_root);
mutex_unlock(&root_ns->lock);
if (error)
goto error;
/* magic symlink similar to nsfs redirects based on task policy */
dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
NULL, &policy_link_iops);
if (IS_ERR(dent)) {
error = PTR_ERR(dent);
goto error;
}
error = aa_mk_null_file(aa_sfs_entry.dentry);
if (error)
goto error;