2024-02-01 14:35:36

by Fedor Pchelkin

Subject: [PATCH] apparmor: use kvfree_sensitive to free data->data

Inside unpack_profile() data->data is allocated using kvmemdup() so it
should be freed with the corresponding kvfree_sensitive().

Also add missing data->data release for rhashtable insertion failure path
in unpack_profile().

Found by Linux Verification Center (linuxtesting.org).

Fixes: e025be0f26d5 ("apparmor: support querying extended trusted helper extra data")
Cc: [email protected]
Signed-off-by: Fedor Pchelkin <[email protected]>
---
security/apparmor/policy.c | 2 +-
security/apparmor/policy_unpack.c | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index 957654d253dd..14df15e35695 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -225,7 +225,7 @@ static void aa_free_data(void *ptr, void *arg)
{
struct aa_data *data = ptr;

- kfree_sensitive(data->data);
+ kvfree_sensitive(data->data, data->size);
kfree_sensitive(data->key);
kfree_sensitive(data);
}
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index 5e578ef0ddff..75452acd0e35 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -1071,6 +1071,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)

if (rhashtable_insert_fast(profile->data, &data->head,
profile->data->p)) {
+ kvfree_sensitive(data->data, data->size);
kfree_sensitive(data->key);
kfree_sensitive(data);
info = "failed to insert data to table";
--
2.43.0

2024-05-10 15:36:46

by John Johansen

Subject: Re: [PATCH] apparmor: use kvfree_sensitive to free data->data

On 2/1/24 06:24, Fedor Pchelkin wrote:
> Inside unpack_profile() data->data is allocated using kvmemdup() so it
> should be freed with the corresponding kvfree_sensitive().
>
> Also add missing data->data release for rhashtable insertion failure path
> in unpack_profile().
>
> Found by Linux Verification Center (linuxtesting.org).
>
> Fixes: e025be0f26d5 ("apparmor: support querying extended trusted helper extra data")
> Cc: [email protected]
> Signed-off-by: Fedor Pchelkin <[email protected]>

Acked-by: John Johansen <[email protected]>

I have pulled this into my tree

> ---
> security/apparmor/policy.c | 2 +-
> security/apparmor/policy_unpack.c | 1 +
> 2 files changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
> index 957654d253dd..14df15e35695 100644
> --- a/security/apparmor/policy.c
> +++ b/security/apparmor/policy.c
> @@ -225,7 +225,7 @@ static void aa_free_data(void *ptr, void *arg)
> {
> struct aa_data *data = ptr;
>
> - kfree_sensitive(data->data);
> + kvfree_sensitive(data->data, data->size);
> kfree_sensitive(data->key);
> kfree_sensitive(data);
> }
> diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
> index 5e578ef0ddff..75452acd0e35 100644
> --- a/security/apparmor/policy_unpack.c
> +++ b/security/apparmor/policy_unpack.c
> @@ -1071,6 +1071,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
>
> if (rhashtable_insert_fast(profile->data, &data->head,
> profile->data->p)) {
> + kvfree_sensitive(data->data, data->size);
> kfree_sensitive(data->key);
> kfree_sensitive(data);
> info = "failed to insert data to table";