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Subject[PATCH 4/7] AppArmor: Move path failure information into aa_get_name and rename
Date
Move the path name lookup failure messages into the main path name lookup
routine, as the information is useful in more than just aa_path_perm.

Also rename aa_get_name to aa_path_name as it is not getting a reference
counted object with a corresponding put fn.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Kees Cook <kees@ubuntu.com>
---
security/apparmor/domain.c | 5 ++---
security/apparmor/file.c | 18 +++++++-----------
security/apparmor/include/path.h | 3 ++-
security/apparmor/path.c | 22 ++++++++++++++++++----
4 files changed, 29 insertions(+), 19 deletions(-)

diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index c1e18ba..7c69599 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -372,13 +372,12 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
state = profile->file.start;

/* buffer freed below, name is pointer into buffer */
- error = aa_get_name(&bprm->file->f_path, profile->path_flags, &buffer,
- &name);
+ error = aa_path_name(&bprm->file->f_path, profile->path_flags, &buffer,
+ &name, &info);
if (error) {
if (profile->flags &
(PFLAG_IX_ON_NAME_ERROR | PFLAG_UNCONFINED))
error = 0;
- info = "Exec failed name resolution";
name = bprm->filename;
goto audit;
}
diff --git a/security/apparmor/file.c b/security/apparmor/file.c
index bba875c..3022c0f 100644
--- a/security/apparmor/file.c
+++ b/security/apparmor/file.c
@@ -278,22 +278,16 @@ int aa_path_perm(int op, struct aa_profile *profile, struct path *path,
int error;

flags |= profile->path_flags | (S_ISDIR(cond->mode) ? PATH_IS_DIR : 0);
- error = aa_get_name(path, flags, &buffer, &name);
+ error = aa_path_name(path, flags, &buffer, &name, &info);
if (error) {
if (error == -ENOENT && is_deleted(path->dentry)) {
/* Access to open files that are deleted are
* give a pass (implicit delegation)
*/
error = 0;
+ info = NULL;
perms.allow = request;
- } else if (error == -ENOENT)
- info = "Failed name lookup - deleted entry";
- else if (error == -ESTALE)
- info = "Failed name lookup - disconnected path";
- else if (error == -ENAMETOOLONG)
- info = "Failed name lookup - name too long";
- else
- info = "Failed name lookup";
+ }
} else {
aa_str_perms(profile->file.dfa, profile->file.start, name, cond,
&perms);
@@ -364,12 +358,14 @@ int aa_path_link(struct aa_profile *profile, struct dentry *old_dentry,
lperms = nullperms;

/* buffer freed below, lname is pointer in buffer */
- error = aa_get_name(&link, profile->path_flags, &buffer, &lname);
+ error = aa_path_name(&link, profile->path_flags, &buffer, &lname,
+ &info);
if (error)
goto audit;

/* buffer2 freed below, tname is pointer in buffer2 */
- error = aa_get_name(&target, profile->path_flags, &buffer2, &tname);
+ error = aa_path_name(&target, profile->path_flags, &buffer2, &tname,
+ &info);
if (error)
goto audit;

diff --git a/security/apparmor/include/path.h b/security/apparmor/include/path.h
index 27b327a..286ac75 100644
--- a/security/apparmor/include/path.h
+++ b/security/apparmor/include/path.h
@@ -26,6 +26,7 @@ enum path_flags {
PATH_MEDIATE_DELETED = 0x10000, /* mediate deleted paths */
};

-int aa_get_name(struct path *path, int flags, char **buffer, const char **name);
+int aa_path_name(struct path *path, int flags, char **buffer,
+ const char **name, const char **info);

#endif /* __AA_PATH_H */
diff --git a/security/apparmor/path.c b/security/apparmor/path.c
index 95a589e..41e19a1 100644
--- a/security/apparmor/path.c
+++ b/security/apparmor/path.c
@@ -157,7 +157,7 @@ out:
* Returns: %0 else error on failure
*/
static int get_name_to_buffer(struct path *path, int flags, char *buffer,
- int size, char **name)
+ int size, char **name, const char **info)
{
int adjust = (flags & PATH_IS_DIR) ? 1 : 0;
int error = d_namespace_path(path, buffer, size - adjust, name, flags);
@@ -169,15 +169,27 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer,
*/
strcpy(&buffer[size - 2], "/");

+ if (info && error) {
+ if (error == -ENOENT)
+ *info = "Failed name lookup - deleted entry";
+ else if (error == -ESTALE)
+ *info = "Failed name lookup - disconnected path";
+ else if (error == -ENAMETOOLONG)
+ *info = "Failed name lookup - name too long";
+ else
+ *info = "Failed name lookup";
+ }
+
return error;
}

/**
- * aa_get_name - compute the pathname of a file
+ * aa_path_name - compute the pathname of a file
* @path: path the file (NOT NULL)
* @flags: flags controlling path name generation
* @buffer: buffer that aa_get_name() allocated (NOT NULL)
* @name: Returns - the generated path name if !error (NOT NULL)
+ * @info: Returns - information on why the path lookup failed (MAYBE NULL)
*
* @name is a pointer to the beginning of the pathname (which usually differs
* from the beginning of the buffer), or NULL. If there is an error @name
@@ -190,7 +202,8 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer,
*
* Returns: %0 else error code if could retrieve name
*/
-int aa_get_name(struct path *path, int flags, char **buffer, const char **name)
+int aa_path_name(struct path *path, int flags, char **buffer, const char **name,
+ const char **info)
{
char *buf, *str = NULL;
int size = 256;
@@ -204,7 +217,7 @@ int aa_get_name(struct path *path, int flags, char **buffer, const char **name)
if (!buf)
return -ENOMEM;

- error = get_name_to_buffer(path, flags, buf, size, &str);
+ error = get_name_to_buffer(path, flags, buf, size, &str, info);
if (error != -ENAMETOOLONG)
break;

@@ -212,6 +225,7 @@ int aa_get_name(struct path *path, int flags, char **buffer, const char **name)
size <<= 1;
if (size > aa_g_path_max)
return -ENAMETOOLONG;
+ *info = NULL;
}
*buffer = buf;
*name = str;
--
1.7.9


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