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Integrity: IMA file free imbalance

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The number of calls to ima_path_check()/ima_file_free()
should be balanced.  An extra call to fput(), indicates
the file could have been accessed without first being
measured.

Although f_count is incremented/decremented in places other
than fget/fput, like fget_light/fput_light and get_file, the
current task must already hold a file refcnt.  The call to
__fput() is delayed until the refcnt becomes 0, resulting
in ima_file_free() flagging any changes.

- add hook to increment opencount for IPC shared memory(SYSV),
  shmat files, and /dev/zero
- moved NULL iint test in opencount_get()

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Mimi Zohar 2009-02-04 09:07:02 -05:00 • committed by James Morris
parent f4bd857bc8
commit 1df9f0a731
6 changed files with 72 additions and 0 deletions
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6
include/linux/ima.h
View file

@ -19,6 +19,7 @@ extern void ima_inode_free(struct inode *inode);
extern int ima_path_check(struct path *path, int mask);
extern void ima_file_free(struct file *file);
extern int ima_file_mmap(struct file *file, unsigned long prot);
extern void ima_shm_check(struct file *file);
#else
static inline int ima_bprm_check(struct linux_binprm *bprm)
@ -50,5 +51,10 @@ static inline int ima_file_mmap(struct file *file, unsigned long prot)
{
return 0;
}
static inline void ima_shm_check(struct file *file)
{
return;
}
#endif /* CONFIG_IMA_H */
#endif /* _LINUX_IMA_H */