diff options
| author | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2017-01-17 06:45:41 -0500 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2017-01-27 14:16:02 -0500 |
| commit | bc15ed663e7e53ee4dc3e60f8d09c93a0528c694 (patch) | |
| tree | 7ab298e6fac6256585436cd3f78b8b1fa36daa02 /security/integrity/ima/ima_main.c | |
| parent | 710584b9daefe25a2b5dc2c6c10dbb00e1b3b451 (diff) | |
ima: fix ima_d_path() possible race with rename
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>
Cc: stable@vger.kernel.org
Diffstat (limited to 'security/integrity/ima/ima_main.c')
| -rw-r--r-- | security/integrity/ima/ima_main.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 50818c60538b..d5e492bd2899 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -83,6 +83,7 @@ static void ima_rdwr_violation_check(struct file *file, 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(struct file *file, 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 file *file, char *buf, loff_t size, 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 file *file, char *buf, loff_t size, 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, |