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smack: dont compile ipv6 code unless ipv6 is configured

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[ Upstream commit bfcf4004bc ]

I want to be sure that ipv6-specific code
is not compiled in kernel binaries
if ipv6 is not configured.

[1] was getting rid of "unused variable" warning, but,
with that, it also mandated compilation of a handful ipv6-
specific functions in ipv4-only kernel configurations:

smk_ipv6_localhost, smack_ipv6host_label, smk_ipv6_check.

Their compiled bodies are likely to be removed by compiler
from the resulting binary, but, to be on the safe side,
I remove them from the compiler view.

[1]
Fixes: 00720f0e7f ("smack: avoid unused 'sip' variable warning")

Signed-off-by: Konstantin Andreev <andreev@swemel.ru>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Konstantin Andreev 2025-01-17 19:36:42 +03:00 committed by Greg Kroah-Hartman
parent e4b3585ad9
commit f7a1e1c2d6
2 changed files with 15 additions and 1 deletions
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6
security/smack/smack.h
View File

@ -152,6 +152,7 @@ struct smk_net4addr {
struct smack_known *smk_label; /* label */
};
#if IS_ENABLED(CONFIG_IPV6)
/*
* An entry in the table identifying IPv6 hosts.
*/
@ -162,7 +163,9 @@ struct smk_net6addr {
int smk_masks; /* mask size */
struct smack_known *smk_label; /* label */
};
#endif /* CONFIG_IPV6 */
#ifdef SMACK_IPV6_PORT_LABELING
/*
* An entry in the table identifying ports.
*/
@ -175,6 +178,7 @@ struct smk_port_label {
short smk_sock_type; /* Socket type */
short smk_can_reuse;
};
#endif /* SMACK_IPV6_PORT_LABELING */
struct smack_known_list_elem {
struct list_head list;
@ -314,7 +318,9 @@ extern struct smack_known smack_known_web;
extern struct mutex smack_known_lock;
extern struct list_head smack_known_list;
extern struct list_head smk_net4addr_list;
#if IS_ENABLED(CONFIG_IPV6)
extern struct list_head smk_net6addr_list;
#endif /* CONFIG_IPV6 */
extern struct mutex smack_onlycap_lock;
extern struct list_head smack_onlycap_list;

10
security/smack/smack_lsm.c
View File

@ -2476,6 +2476,7 @@ static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
return NULL;
}
#if IS_ENABLED(CONFIG_IPV6)
/*
* smk_ipv6_localhost - Check for local ipv6 host address
* @sip: the address
@ -2543,6 +2544,7 @@ static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
return NULL;
}
#endif /* CONFIG_IPV6 */
/**
* smack_netlbl_add - Set the secattr on a socket
@ -2646,6 +2648,7 @@ static int smk_ipv4_check(struct sock *sk, struct sockaddr_in *sap)
return rc;
}
#if IS_ENABLED(CONFIG_IPV6)
/**
* smk_ipv6_check - check Smack access
* @subject: subject Smack label
@ -2678,6 +2681,7 @@ static int smk_ipv6_check(struct smack_known *subject,
rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
return rc;
}
#endif /* CONFIG_IPV6 */
#ifdef SMACK_IPV6_PORT_LABELING
/**
@ -3010,7 +3014,9 @@ static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
return 0;
if (addrlen < offsetofend(struct sockaddr, sa_family))
return 0;
if (IS_ENABLED(CONFIG_IPV6) && sap->sa_family == AF_INET6) {
#if IS_ENABLED(CONFIG_IPV6)
if (sap->sa_family == AF_INET6) {
struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
struct smack_known *rsp = NULL;
@ -3030,6 +3036,8 @@ static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
return rc;
}
#endif /* CONFIG_IPV6 */
if (sap->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in))
return 0;
rc = smk_ipv4_check(sock->sk, (struct sockaddr_in *)sap);