[PATCH 4.9 051/153] ima: fix ima_d_path() possible race with rename

Greg Kroah-Hartman
2017-03-10T09:19:37Z

From: Mimi Zohar <zohar@linux.vnet.ibm.com>

commit bc15ed663e7e53ee4dc3e60f8d09c93a0528c694 upstream.

On failure to return a pathname from ima_d_path(), a pointer to
dname is returned, which is subsequently used in the IMA measurement
list, the IMA audit records, and other audit logging. Saving the
pointer to dname for later use has the potential to race with rename.

Intead of returning a pointer to dname on failure, this patch returns
a pointer to a copy of the filename.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
security/integrity/ima/ima.h | 2 +-
security/integrity/ima/ima_api.c | 20 ++++++++++++++++++--
security/integrity/ima/ima_main.c | 8 +++++---
3 files changed, 24 insertions(+), 6 deletions(-)

--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -173,7 +173,7 @@ int ima_store_template(struct ima_templa
struct inode *inode,
const unsigned char *filename, int pcr);
void ima_free_template_entry(struct ima_template_entry *entry);
-const char *ima_d_path(const struct path *path, char **pathbuf);
+const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);

/* IMA policy related functions */
int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -318,7 +318,17 @@ void ima_audit_measurement(struct integr
iint->flags |= IMA_AUDITED;
}

-const char *ima_d_path(const struct path *path, char **pathbuf)
+/*
+ * ima_d_path - return a pointer to the full pathname
+ *
+ * Attempt to return a pointer to the full pathname for use in the
+ * IMA measurement list, IMA audit records, and auditing logs.
+ *
+ * On failure, return a pointer to a copy of the filename, not dname.
+ * Returning a pointer to dname, could result in using the pointer
+ * after the memory has been freed.
+ */
+const char *ima_d_path(const struct path *path, char **pathbuf, char *namebuf)
{
char *pathname = NULL;

@@ -331,5 +341,11 @@ const char *ima_d_path(const struct path
pathname = NULL;
}
}
- return pathname ?: (const char *)path->dentry->d_name.name;
+
+ if (!pathname) {
+ strlcpy(namebuf, path->dentry->d_name.name, NAME_MAX);
+ pathname = namebuf;
+ }
+
+ return pathname;
}
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -83,6 +83,7 @@ static void ima_rdwr_violation_check(str
const char **pathname)
{
struct inode *inode = file_inode(file);
+ char filename[NAME_MAX];
fmode_t mode = file->f_mode;
bool send_tomtou = false, send_writers = false;

@@ -102,7 +103,7 @@ static void ima_rdwr_violation_check(str
if (!send_tomtou && !send_writers)
return;

- *pathname = ima_d_path(&file->f_path, pathbuf);
+ *pathname = ima_d_path(&file->f_path, pathbuf, filename);

if (send_tomtou)
ima_add_violation(file, *pathname, iint,
@@ -161,6 +162,7 @@ static int process_measurement(struct fi
struct integrity_iint_cache *iint = NULL;
struct ima_template_desc *template_desc;
char *pathbuf = NULL;
+ char filename[NAME_MAX];
const char *pathname = NULL;
int rc = -ENOMEM, action, must_appraise;
int pcr = CONFIG_IMA_MEASURE_PCR_IDX;
@@ -239,8 +241,8 @@ static int process_measurement(struct fi
goto out_digsig;
}

- if (!pathname) /* ima_rdwr_violation possibly pre-fetched */
- pathname = ima_d_path(&file->f_path, &pathbuf);
+ if (!pathbuf) /* ima_rdwr_violation possibly pre-fetched */
+ pathname = ima_d_path(&file->f_path, &pathbuf, filename);

if (action & IMA_MEASURE)
ima_store_measurement(iint, file, pathname,