On Thu, 2024-11-28 at 11:06 +0100, Roberto Sassu wrote:
From: Roberto Sassu roberto.sassu@huawei.com
According to man open.2, files opened with O_PATH are not really opened. The obtained file descriptor is used to indicate a location in the filesystem tree and to perform operations that act purely at the file descriptor level.
Thus, ignore open() syscalls with O_PATH, since IMA cares about file data.
Cc: stable@vger.kernel.org # v2.6.39.x Fixes: 1abf0c718f15a ("New kind of open files - "location only".") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com
Thanks, Roberto.
Note: Ignoring open() with O_PATH impacts policies containing "func=FILE_CHECK" rules.
Reviewed-by: Mimi Zohar zohar@linux.ibm.com
security/integrity/ima/ima_main.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 50b37420ea2c..712c3a522e6c 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -202,7 +202,8 @@ static void ima_file_free(struct file *file) struct inode *inode = file_inode(file); struct ima_iint_cache *iint;
- if (!ima_policy_flag || !S_ISREG(inode->i_mode))
- if (!ima_policy_flag || !S_ISREG(inode->i_mode) ||
- (file->f_flags & O_PATH))
return; iint = ima_iint_find(inode); @@ -232,7 +233,8 @@ static int process_measurement(struct file *file, const struct cred *cred, enum hash_algo hash_algo; unsigned int allowed_algos = 0;
- if (!ima_policy_flag || !S_ISREG(inode->i_mode))
- if (!ima_policy_flag || !S_ISREG(inode->i_mode) ||
- (file->f_flags & O_PATH))
return 0; /* Return an IMA_MEASURE, IMA_APPRAISE, IMA_AUDIT action