On Thu, Nov 28, 2024 at 11:06:19AM +0100, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxx # v2.6.39.x
> Fixes: 1abf0c718f15a ("New kind of open files - "location only".")
> Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
> ---
> 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;
if (file->f_mode & FMODE_PATH)
please.
