diff options
Diffstat (limited to 'security')
| -rw-r--r-- | security/integrity/ima/ima_main.c | 54 |
1 files changed, 33 insertions, 21 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 2191b36ad1da..03bb52ecf490 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -77,21 +77,19 @@ __setup("ima_hash=", hash_setup); * could result in a file measurement error. * */ -static void ima_rdwr_violation_check(struct file *file) +static void ima_rdwr_violation_check(struct file *file, + struct integrity_iint_cache *iint, + char **pathbuf, + const char **pathname) { struct inode *inode = file_inode(file); fmode_t mode = file->f_mode; bool send_tomtou = false, send_writers = false; - char *pathbuf = NULL; - const char *pathname; - - if (!S_ISREG(inode->i_mode) || !(ima_policy_flag & IMA_MEASURE)) - return; if (mode & FMODE_WRITE) { if (atomic_read(&inode->i_readcount) && IS_IMA(inode)) { - struct integrity_iint_cache *iint; - iint = integrity_iint_find(inode); + if (!iint) + iint = integrity_iint_find(inode); /* IMA_MEASURE is set from reader side */ if (iint && (iint->flags & IMA_MEASURE)) send_tomtou = true; @@ -105,14 +103,13 @@ 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); if (send_tomtou) - ima_add_violation(file, pathname, "invalid_pcr", "ToMToU"); + ima_add_violation(file, *pathname, "invalid_pcr", "ToMToU"); if (send_writers) - ima_add_violation(file, pathname, + ima_add_violation(file, *pathname, "invalid_pcr", "open_writers"); - kfree(pathbuf); } static void ima_check_last_writer(struct integrity_iint_cache *iint, @@ -160,13 +157,14 @@ static int process_measurement(struct file *file, int mask, int function, int opened) { struct inode *inode = file_inode(file); - struct integrity_iint_cache *iint; + struct integrity_iint_cache *iint = NULL; struct ima_template_desc *template_desc; char *pathbuf = NULL; const char *pathname = NULL; int rc = -ENOMEM, action, must_appraise; struct evm_ima_xattr_data *xattr_value = NULL, **xattr_ptr = NULL; int xattr_len = 0; + bool violation_check; if (!ima_policy_flag || !S_ISREG(inode->i_mode)) return 0; @@ -176,7 +174,9 @@ static int process_measurement(struct file *file, int mask, int function, * Included is the appraise submask. */ action = ima_get_action(inode, mask, function); - if (!action) + violation_check = (function == FILE_CHECK && + (ima_policy_flag & IMA_MEASURE)); + if (!action && !violation_check) return 0; must_appraise = action & IMA_APPRAISE; @@ -187,9 +187,19 @@ static int process_measurement(struct file *file, int mask, int function, mutex_lock(&inode->i_mutex); - iint = integrity_inode_get(inode); - if (!iint) - goto out; + if (action) { + iint = integrity_inode_get(inode); + if (!iint) + goto out; + } + + if (violation_check) { + ima_rdwr_violation_check(file, iint, &pathbuf, &pathname); + if (!action) { + rc = 0; + goto out_free; + } + } /* Determine if already appraised/measured based on bitmask * (IMA_MEASURE, IMA_MEASURED, IMA_XXXX_APPRAISE, IMA_XXXX_APPRAISED, @@ -218,7 +228,8 @@ static int process_measurement(struct file *file, int mask, int function, goto out_digsig; } - pathname = ima_d_path(&file->f_path, &pathbuf); + if (!pathname) /* ima_rdwr_violation possibly pre-fetched */ + pathname = ima_d_path(&file->f_path, &pathbuf); if (action & IMA_MEASURE) ima_store_measurement(iint, file, pathname, @@ -228,13 +239,15 @@ static int process_measurement(struct file *file, int mask, int function, xattr_value, xattr_len, opened); if (action & IMA_AUDIT) ima_audit_measurement(iint, pathname); - kfree(pathbuf); + out_digsig: if ((mask & MAY_WRITE) && (iint->flags & IMA_DIGSIG)) rc = -EACCES; + kfree(xattr_value); +out_free: + kfree(pathbuf); out: mutex_unlock(&inode->i_mutex); - kfree(xattr_value); if ((rc && must_appraise) && (ima_appraise & IMA_APPRAISE_ENFORCE)) return -EACCES; return 0; @@ -288,7 +301,6 @@ int ima_bprm_check(struct linux_binprm *bprm) */ int ima_file_check(struct file *file, int mask, int opened) { - ima_rdwr_violation_check(file); return process_measurement(file, mask & (MAY_READ | MAY_WRITE | MAY_EXEC), FILE_CHECK, opened); |