Merge tag 'apparmor-pr-2018-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor

Pull apparmor updates from John Johansen:
 "Features:
  - add base infrastructure for socket mediation. ABI bump and
    additional checks to ensure only v8 compliant policy uses socket af
    mediation.
  - improve and cleanup dfa verification
  - improve profile attachment logic
     - improve overlapping expression handling
     - add the xattr matching to the attachment logic
  - improve signal mediation handling with stacked labels
  - improve handling of no_new_privs in a label stack

  Cleanups and changes:
  - use dfa to parse string split
  - bounded version of label_parse
  - proper line wrap nulldfa.in
  - split context out into task and cred naming to better match usage
  - simplify code in aafs

  Bug fixes:
  - fix display of .ns_name for containers
  - fix resource audit messages when auditing peer
  - fix logging of the existence test for signals
  - fix resource audit messages when auditing peer
  - fix display of .ns_name for containers
  - fix an error code in verify_table_headers()
  - fix memory leak on buffer on error exit path
  - fix error returns checks by making size a ssize_t"

* tag 'apparmor-pr-2018-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: (36 commits)
  apparmor: fix memory leak on buffer on error exit path
  apparmor: fix dangling symlinks to policy rawdata after replacement
  apparmor: Fix an error code in verify_table_headers()
  apparmor: fix error returns checks by making size a ssize_t
  apparmor: update MAINTAINERS file git and wiki locations
  apparmor: remove POLICY_MEDIATES_SAFE
  apparmor: add base infastructure for socket mediation
  apparmor: improve overlapping domain attachment resolution
  apparmor: convert attaching profiles via xattrs to use dfa matching
  apparmor: Add support for attaching profiles via xattr, presence and value
  apparmor: cleanup: simplify code to get ns symlink name
  apparmor: cleanup create_aafs() error path
  apparmor: dfa split verification of table headers
  apparmor: dfa add support for state differential encoding
  apparmor: dfa move character match into a macro
  apparmor: update domain transitions that are subsets of confinement at nnp
  apparmor: move context.h to cred.h
  apparmor: move task related defines and fns to task.X files
  apparmor: cleanup, drop unused fn __aa_task_is_confined()
  apparmor: cleanup fixup description of aa_replace_profiles
  ...

1 files changed, 127 insertions, 76 deletions

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index a9428daa69f3..949dd8a48164 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -30,10 +30,9 @@
 #include "include/apparmor.h"
 #include "include/apparmorfs.h"
 #include "include/audit.h"
-#include "include/context.h"
+#include "include/cred.h"
 #include "include/crypto.h"
 #include "include/ipc.h"
-#include "include/policy_ns.h"
 #include "include/label.h"
 #include "include/policy.h"
 #include "include/policy_ns.h"
@@ -120,9 +119,7 @@ static int aafs_count;
 
 static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
 {
-	struct inode *inode = d_inode(dentry);
-
-	seq_printf(seq, "%s:[%lu]", AAFS_NAME, inode->i_ino);
+	seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino);
 	return 0;
 }
 
@@ -313,6 +310,7 @@ static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
  * @name: name of dentry to create
  * @parent: parent directory for this dentry
  * @target: if symlink, symlink target string
+ * @private: private data
  * @iops: struct of inode_operations that should be used
  *
  * If @target parameter is %NULL, then the @iops parameter needs to be
@@ -321,17 +319,17 @@ static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
 static struct dentry *aafs_create_symlink(const char *name,
 					  struct dentry *parent,
 					  const char *target,
+					  void *private,
 					  const struct inode_operations *iops)
 {
 	struct dentry *dent;
 	char *link = NULL;
 
 	if (target) {
-		link = kstrdup(target, GFP_KERNEL);
 		if (!link)
 			return ERR_PTR(-ENOMEM);
 	}
-	dent = aafs_create(name, S_IFLNK | 0444, parent, NULL, link, NULL,
+	dent = aafs_create(name, S_IFLNK | 0444, parent, private, link, NULL,
 			   iops);
 	if (IS_ERR(dent))
 		kfree(link);
@@ -622,7 +620,7 @@ static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
 			tmp = aa_compute_fperms(dfa, state, &cond);
 		}
 	} else if (profile->policy.dfa) {
-		if (!PROFILE_MEDIATES_SAFE(profile, *match_str))
+		if (!PROFILE_MEDIATES(profile, *match_str))
 			return;	/* no change to current perms */
 		dfa = profile->policy.dfa;
 		state = aa_dfa_match_len(dfa, profile->policy.start[0],
@@ -1189,9 +1187,7 @@ static int seq_ns_level_show(struct seq_file *seq, void *v)
 static int seq_ns_name_show(struct seq_file *seq, void *v)
 {
 	struct aa_label *label = begin_current_label_crit_section();
-
-	seq_printf(seq, "%s\n", aa_ns_name(labels_ns(label),
-					   labels_ns(label), true));
+	seq_printf(seq, "%s\n", labels_ns(label)->base.name);
 	end_current_label_crit_section(label);
 
 	return 0;
@@ -1484,26 +1480,97 @@ static int profile_depth(struct aa_profile *profile)
 	return depth;
 }
 
-static int gen_symlink_name(char *buffer, size_t bsize, int depth,
-			    const char *dirname, const char *fname)
+static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
 {
+	char *buffer, *s;
 	int error;
+	int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
+
+	s = buffer = kmalloc(size, GFP_KERNEL);
+	if (!buffer)
+		return ERR_PTR(-ENOMEM);
 
 	for (; depth > 0; depth--) {
-		if (bsize < 7)
-			return -ENAMETOOLONG;
-		strcpy(buffer, "../../");
-		buffer += 6;
-		bsize -= 6;
+		strcpy(s, "../../");
+		s += 6;
+		size -= 6;
 	}
 
-	error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname);
-	if (error >= bsize || error < 0)
-		return -ENAMETOOLONG;
+	error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
+	if (error >= size || error < 0) {
+		kfree(buffer);
+		return ERR_PTR(-ENAMETOOLONG);
+	}
 
-	return 0;
+	return buffer;
+}
+
+static void rawdata_link_cb(void *arg)
+{
+	kfree(arg);
+}
+
+static const char *rawdata_get_link_base(struct dentry *dentry,
+					 struct inode *inode,
+					 struct delayed_call *done,
+					 const char *name)
+{
+	struct aa_proxy *proxy = inode->i_private;
+	struct aa_label *label;
+	struct aa_profile *profile;
+	char *target;
+	int depth;
+
+	if (!dentry)
+		return ERR_PTR(-ECHILD);
+
+	label = aa_get_label_rcu(&proxy->label);
+	profile = labels_profile(label);
+	depth = profile_depth(profile);
+	target = gen_symlink_name(depth, profile->rawdata->name, name);
+	aa_put_label(label);
+
+	if (IS_ERR(target))
+		return target;
+
+	set_delayed_call(done, rawdata_link_cb, target);
+
+	return target;
+}
+
+static const char *rawdata_get_link_sha1(struct dentry *dentry,
+					 struct inode *inode,
+					 struct delayed_call *done)
+{
+	return rawdata_get_link_base(dentry, inode, done, "sha1");
+}
+
+static const char *rawdata_get_link_abi(struct dentry *dentry,
+					struct inode *inode,
+					struct delayed_call *done)
+{
+	return rawdata_get_link_base(dentry, inode, done, "abi");
+}
+
+static const char *rawdata_get_link_data(struct dentry *dentry,
+					 struct inode *inode,
+					 struct delayed_call *done)
+{
+	return rawdata_get_link_base(dentry, inode, done, "raw_data");
 }
 
+static const struct inode_operations rawdata_link_sha1_iops = {
+	.get_link	= rawdata_get_link_sha1,
+};
+
+static const struct inode_operations rawdata_link_abi_iops = {
+	.get_link	= rawdata_get_link_abi,
+};
+static const struct inode_operations rawdata_link_data_iops = {
+	.get_link	= rawdata_get_link_data,
+};
+
+
 /*
  * Requires: @profile->ns->lock held
  */
@@ -1574,34 +1641,28 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
 	}
 
 	if (profile->rawdata) {
-		char target[64];
-		int depth = profile_depth(profile);
-
-		error = gen_symlink_name(target, sizeof(target), depth,
-					 profile->rawdata->name, "sha1");
-		if (error < 0)
-			goto fail2;
-		dent = aafs_create_symlink("raw_sha1", dir, target, NULL);
+		dent = aafs_create_symlink("raw_sha1", dir, NULL,
+					   profile->label.proxy,
+					   &rawdata_link_sha1_iops);
 		if (IS_ERR(dent))
 			goto fail;
+		aa_get_proxy(profile->label.proxy);
 		profile->dents[AAFS_PROF_RAW_HASH] = dent;
 
-		error = gen_symlink_name(target, sizeof(target), depth,
-					 profile->rawdata->name, "abi");
-		if (error < 0)
-			goto fail2;
-		dent = aafs_create_symlink("raw_abi", dir, target, NULL);
+		dent = aafs_create_symlink("raw_abi", dir, NULL,
+					   profile->label.proxy,
+					   &rawdata_link_abi_iops);
 		if (IS_ERR(dent))
 			goto fail;
+		aa_get_proxy(profile->label.proxy);
 		profile->dents[AAFS_PROF_RAW_ABI] = dent;
 
-		error = gen_symlink_name(target, sizeof(target), depth,
-					 profile->rawdata->name, "raw_data");
-		if (error < 0)
-			goto fail2;
-		dent = aafs_create_symlink("raw_data", dir, target, NULL);
+		dent = aafs_create_symlink("raw_data", dir, NULL,
+					   profile->label.proxy,
+					   &rawdata_link_data_iops);
 		if (IS_ERR(dent))
 			goto fail;
+		aa_get_proxy(profile->label.proxy);
 		profile->dents[AAFS_PROF_RAW_DATA] = dent;
 	}
 
@@ -2152,6 +2213,10 @@ static struct aa_sfs_entry aa_sfs_entry_signal[] = {
 	{ }
 };
 
+static struct aa_sfs_entry aa_sfs_entry_attach[] = {
+	AA_SFS_FILE_BOOLEAN("xattr", 1),
+	{ }
+};
 static struct aa_sfs_entry aa_sfs_entry_domain[] = {
 	AA_SFS_FILE_BOOLEAN("change_hat",	1),
 	AA_SFS_FILE_BOOLEAN("change_hatv",	1),
@@ -2159,6 +2224,9 @@ static struct aa_sfs_entry aa_sfs_entry_domain[] = {
 	AA_SFS_FILE_BOOLEAN("change_profile",	1),
 	AA_SFS_FILE_BOOLEAN("stack",		1),
 	AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap",	1),
+	AA_SFS_FILE_BOOLEAN("post_nnp_subset",	1),
+	AA_SFS_FILE_BOOLEAN("computed_longest_left",	1),
+	AA_SFS_DIR("attach_conditions",		aa_sfs_entry_attach),
 	AA_SFS_FILE_STRING("version", "1.2"),
 	{ }
 };
@@ -2167,6 +2235,7 @@ static struct aa_sfs_entry aa_sfs_entry_versions[] = {
 	AA_SFS_FILE_BOOLEAN("v5",	1),
 	AA_SFS_FILE_BOOLEAN("v6",	1),
 	AA_SFS_FILE_BOOLEAN("v7",	1),
+	AA_SFS_FILE_BOOLEAN("v8",	1),
 	{ }
 };
 
@@ -2202,6 +2271,7 @@ static struct aa_sfs_entry aa_sfs_entry_features[] = {
 	AA_SFS_DIR("policy",			aa_sfs_entry_policy),
 	AA_SFS_DIR("domain",			aa_sfs_entry_domain),
 	AA_SFS_DIR("file",			aa_sfs_entry_file),
+	AA_SFS_DIR("network_v8",		aa_sfs_entry_network),
 	AA_SFS_DIR("mount",			aa_sfs_entry_mount),
 	AA_SFS_DIR("namespaces",		aa_sfs_entry_ns),
 	AA_SFS_FILE_U64("capability",		VFS_CAP_FLAGS_MASK),
@@ -2394,29 +2464,18 @@ static const char *policy_get_link(struct dentry *dentry,
 	return NULL;
 }
 
-static int ns_get_name(char *buf, size_t size, struct aa_ns *ns,
-		       struct inode *inode)
-{
-	int res = snprintf(buf, size, "%s:[%lu]", AAFS_NAME, inode->i_ino);
-
-	if (res < 0 || res >= size)
-		res = -ENOENT;
-
-	return res;
-}
-
 static int policy_readlink(struct dentry *dentry, char __user *buffer,
 			   int buflen)
 {
-	struct aa_ns *ns;
 	char name[32];
 	int res;
 
-	ns = aa_get_current_ns();
-	res = ns_get_name(name, sizeof(name), ns, d_inode(dentry));
-	if (res >= 0)
+	res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME,
+		       d_inode(dentry)->i_ino);
+	if (res > 0 && res < sizeof(name))
 		res = readlink_copy(buffer, buflen, name);
-	aa_put_ns(ns);
+	else
+		res = -ENOENT;
 
 	return res;
 }
@@ -2460,34 +2519,26 @@ static int __init aa_create_aafs(void)
 
 	dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
 				      NULL, &aa_fs_profile_load);
-	if (IS_ERR(dent)) {
-		error = PTR_ERR(dent);
-		goto error;
-	}
+	if (IS_ERR(dent))
+		goto dent_error;
 	ns_subload(root_ns) = dent;
 
 	dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
 				      NULL, &aa_fs_profile_replace);
-	if (IS_ERR(dent)) {
-		error = PTR_ERR(dent);
-		goto error;
-	}
+	if (IS_ERR(dent))
+		goto dent_error;
 	ns_subreplace(root_ns) = dent;
 
 	dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
 				      NULL, &aa_fs_profile_remove);
-	if (IS_ERR(dent)) {
-		error = PTR_ERR(dent);
-		goto error;
-	}
+	if (IS_ERR(dent))
+		goto dent_error;
 	ns_subremove(root_ns) = dent;
 
 	dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
 				      NULL, &aa_fs_ns_revision_fops);
-	if (IS_ERR(dent)) {
-		error = PTR_ERR(dent);
-		goto error;
-	}
+	if (IS_ERR(dent))
+		goto dent_error;
 	ns_subrevision(root_ns) = dent;
 
 	/* policy tree referenced by magic policy symlink */
@@ -2501,10 +2552,8 @@ static int __init aa_create_aafs(void)
 	/* 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;
-	}
+	if (IS_ERR(dent))
+		goto dent_error;
 
 	error = aa_mk_null_file(aa_sfs_entry.dentry);
 	if (error)
@@ -2516,6 +2565,8 @@ static int __init aa_create_aafs(void)
 	aa_info_message("AppArmor Filesystem Enabled");
 	return 0;
 
+dent_error:
+	error = PTR_ERR(dent);
 error:
 	aa_destroy_aafs();
 	AA_ERROR("Error creating AppArmor securityfs\n");