From: Tyler Hicks <tyhicks@linux.microsoft.com>
To: Casey Schaufler <casey@schaufler-ca.com>
Cc: Mimi Zohar <zohar@linux.ibm.com>,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
James Morris <jmorris@namei.org>,
"Serge E . Hallyn" <serge@hallyn.com>,
Lakshmi Ramasubramanian <nramas@linux.microsoft.com>,
Prakhar Srivastava <prsriva02@gmail.com>,
linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
Janne Karhunen <janne.karhunen@gmail.com>
Subject: Re: [PATCH 01/12] ima: Have the LSM free its audit rule
Date: Mon, 22 Jun 2020 22:04:10 -0500 [thread overview]
Message-ID: <20200623030410.GA6048@sequoia> (raw)
In-Reply-To: <277dd210-c443-c067-e731-44ac53418fa5@schaufler-ca.com>
On 2020-06-22 17:55:59, Casey Schaufler wrote:
> On 6/22/2020 5:32 PM, Tyler Hicks wrote:
> > Ask the LSM to free its audit rule rather than directly calling kfree().
> > Both AppArmor and SELinux do additional work in their audit_rule_free()
> > hooks. Fix memory leaks by allowing the LSMs to perform necessary work.
> >
> > Fixes: b16942455193 ("ima: use the lsm policy update notifier")
> > Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
> > Cc: Janne Karhunen <janne.karhunen@gmail.com>
> > ---
> > security/integrity/ima/ima.h | 6 ++++++
> > security/integrity/ima/ima_policy.c | 2 +-
> > 2 files changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
> > index df93ac258e01..de05d7f1d3ec 100644
> > --- a/security/integrity/ima/ima.h
> > +++ b/security/integrity/ima/ima.h
> > @@ -404,6 +404,7 @@ static inline void ima_free_modsig(struct modsig *modsig)
> > #ifdef CONFIG_IMA_LSM_RULES
> >
> > #define security_filter_rule_init security_audit_rule_init
> > +#define security_filter_rule_free security_audit_rule_free
> > #define security_filter_rule_match security_audit_rule_match
>
> In context this seems perfectly reasonable. If, however, you're
> working with the LSM infrastructure this set of #defines is maddening.
> The existing ones have been driving my nuts for the past few years,
> so I'd like to discourage adding another. Since the security_filter_rule
> functions are IMA specific they shouldn't be prefixed security_. I know
> that it seems to be code churn/bikesheading, but we please change these:
>
> static inline int ima_filter_rule_init(.....)
> {
> return security_audit_rule_init(.....);
> }
>
> and so forth. I understand if you don't want to make the change.
> I have plenty of other things driving me crazy just now, so this
> doesn't seem likely to push me over the edge.
I'd be happy to take a stab at that as a follow-up or a 13/12 patch. I'd
like to leave this one as-is for stable kernel reasons since it is
straightforward and simple.
Tyler
>
> >
> > #else
> > @@ -414,6 +415,11 @@ static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
> > return -EINVAL;
> > }
> >
> > +static inline void security_filter_rule_free(void *lsmrule)
> > +{
> > + return -EINVAL;
> > +}
> > +
> > static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
> > void *lsmrule)
> > {
> > diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
> > index e493063a3c34..236a731492d1 100644
> > --- a/security/integrity/ima/ima_policy.c
> > +++ b/security/integrity/ima/ima_policy.c
> > @@ -258,7 +258,7 @@ static void ima_lsm_free_rule(struct ima_rule_entry *entry)
> > int i;
> >
> > for (i = 0; i < MAX_LSM_RULES; i++) {
> > - kfree(entry->lsm[i].rule);
> > + security_filter_rule_free(entry->lsm[i].rule);
> > kfree(entry->lsm[i].args_p);
> > }
> > kfree(entry);
next prev parent reply other threads:[~2020-06-23 3:04 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 0:32 [PATCH 00/12] ima: Fix rule parsing bugs and extend KEXEC_CMDLINE rule support Tyler Hicks
2020-06-23 0:32 ` [PATCH 01/12] ima: Have the LSM free its audit rule Tyler Hicks
2020-06-23 0:55 ` Casey Schaufler
2020-06-23 3:04 ` Tyler Hicks [this message]
2020-06-23 23:04 ` Tyler Hicks
2020-06-25 19:41 ` Mimi Zohar
2020-06-23 0:32 ` [PATCH 02/12] ima: Create a function to free a rule entry Tyler Hicks
2020-06-25 19:33 ` Mimi Zohar
2020-06-25 19:56 ` Tyler Hicks
2020-06-25 20:32 ` Mimi Zohar
2020-06-23 0:32 ` [PATCH 03/12] ima: Free the entire rule when deleting a list of rules Tyler Hicks
2020-06-25 21:05 ` Mimi Zohar
2020-06-25 21:07 ` Mimi Zohar
2020-06-25 21:08 ` Mimi Zohar
2020-06-23 0:32 ` [PATCH 04/12] ima: Free the entire rule if it fails to parse Tyler Hicks
2020-06-23 0:32 ` [PATCH 05/12] ima: Fail rule parsing when buffer hook functions have an invalid action Tyler Hicks
2020-06-25 21:51 ` Mimi Zohar
2020-06-23 0:32 ` [PATCH 06/12] ima: Fail rule parsing when the KEXEC_CMDLINE hook is combined with an invalid cond Tyler Hicks
2020-06-25 21:53 ` Mimi Zohar
2020-06-23 0:32 ` [PATCH 07/12] ima: Fail rule parsing when the KEY_CHECK " Tyler Hicks
2020-06-23 0:32 ` [PATCH 08/12] ima: Shallow copy the args_p member of ima_rule_entry.lsm elements Tyler Hicks
2020-06-25 21:18 ` Mimi Zohar
2020-06-23 0:32 ` [PATCH 09/12] ima: Use correct type for " Tyler Hicks
2020-06-25 21:20 ` Mimi Zohar
2020-06-23 0:32 ` [PATCH 10/12] ima: Move validation of the keyrings conditional into ima_validate_rule() Tyler Hicks
2020-06-25 19:50 ` Tyler Hicks
2020-06-25 20:46 ` Mimi Zohar
2020-06-23 0:32 ` [PATCH 11/12] ima: Use the common function to detect LSM conditionals in a rule Tyler Hicks
2020-06-25 22:45 ` Mimi Zohar
2020-06-23 0:32 ` [PATCH 12/12] ima: Support additional conditionals in the KEXEC_CMDLINE hook function Tyler Hicks
2020-06-25 22:56 ` Mimi Zohar
2020-06-25 22:59 ` Tyler Hicks
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