From 4e8581eefe720f8d990b892a8c9d298875e1a299 Mon Sep 17 00:00:00 2001 From: Roberto Sassu Date: Thu, 30 Nov 2017 11:56:02 +0100 Subject: ima: pass filename to ima_rdwr_violation_check() ima_rdwr_violation_check() retrieves the full path of a measured file by calling ima_d_path(). If process_measurement() calls this function, it reuses the pointer and passes it to the functions to measure/appraise/audit an accessed file. After commit bc15ed663e7e ("ima: fix ima_d_path() possible race with rename"), ima_d_path() first tries to retrieve the full path by calling d_absolute_path() and, if there is an error, copies the dentry name to the buffer passed as argument. However, ima_rdwr_violation_check() passes to ima_d_path() the pointer of a local variable. process_measurement() might be reusing the pointer to an area in the stack which may have been already overwritten after ima_rdwr_violation_check() returned. Correct this issue by passing to ima_rdwr_violation_check() the pointer of a buffer declared in process_measurement(). Fixes: bc15ed663e7e ("ima: fix ima_d_path() possible race with rename") Signed-off-by: Roberto Sassu Signed-off-by: Mimi Zohar --- security/integrity/ima/ima_main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'security') diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index be1987e..0abc7d0d 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -84,10 +84,10 @@ static void ima_rdwr_violation_check(struct file *file, struct integrity_iint_cache *iint, int must_measure, char **pathbuf, - const char **pathname) + const char **pathname, + char *filename) { struct inode *inode = file_inode(file); - char filename[NAME_MAX]; fmode_t mode = file->f_mode; bool send_tomtou = false, send_writers = false; @@ -210,7 +210,7 @@ static int process_measurement(struct file *file, char *buf, loff_t size, if (!rc && violation_check) ima_rdwr_violation_check(file, iint, action & IMA_MEASURE, - &pathbuf, &pathname); + &pathbuf, &pathname, filename); inode_unlock(inode); -- cgit v1.1