linux-kernel - Re: [PATCH v2 6/7] ima: Discard files opened with O

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Message-ID: <99408482e7f5002b2b3defb6d7b816b25e11cbbf.camel@huaweicloud.com>
Date: Thu, 28 Nov 2024 17:25:21 +0100
From: Roberto Sassu <roberto.sassu@...weicloud.com>
To: Christian Brauner <brauner@...nel.org>
Cc: viro@...iv.linux.org.uk, jack@...e.cz, zohar@...ux.ibm.com, 
 dmitry.kasatkin@...il.com, eric.snowberg@...cle.com, paul@...l-moore.com, 
 jmorris@...ei.org, serge@...lyn.com, linux-fsdevel@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org, 
 linux-security-module@...r.kernel.org, Roberto Sassu
 <roberto.sassu@...wei.com>,  stable@...r.kernel.org
Subject: Re: [PATCH v2 6/7] ima: Discard files opened with O_PATH

On Thu, 2024-11-28 at 17:22 +0100, Christian Brauner wrote:
> On Thu, Nov 28, 2024 at 11:06:19AM +0100, Roberto Sassu wrote:
> > From: Roberto Sassu <roberto.sassu@...wei.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@...r.kernel.org # v2.6.39.x
> > Fixes: 1abf0c718f15a ("New kind of open files - "location only".")
> > Signed-off-by: Roberto Sassu <roberto.sassu@...wei.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;
> 
> if (file->f_mode & FMODE_PATH)
> 
> please.

Oh, ok.

Thanks

Roberto