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selinux: revert SECINITSID_INIT support 

This commit reverts 5b0eea835d ("selinux: introduce an initial SID
for early boot processes") as it was found to cause problems on
distros with old SELinux userspace tools/libraries, specifically
Ubuntu 16.04.

Hopefully we will be able to re-add this functionality at a later
date, but let's revert this for now to help ensure a stable and
backwards compatible SELinux tree.

Link: https://lore.kernel.org/selinux/87edkseqf8.fsf@mail.lhotse
Acked-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore 2023-08-07 22:57:22 -04:00
parent 2b86e04bce
commit 817199e006
6 changed files with 1 additions and 64 deletions
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28
security/selinux/hooks.c
View File

@ -2313,19 +2313,6 @@ static int selinux_bprm_creds_for_exec(struct linux_binprm *bprm)
new_tsec->keycreate_sid = 0;
new_tsec->sockcreate_sid = 0;
/*
* Before policy is loaded, label any task outside kernel space
* as SECINITSID_INIT, so that any userspace tasks surviving from
* early boot end up with a label different from SECINITSID_KERNEL
* (if the policy chooses to set SECINITSID_INIT != SECINITSID_KERNEL).
*/
if (!selinux_initialized()) {
new_tsec->sid = SECINITSID_INIT;
/* also clear the exec_sid just in case */
new_tsec->exec_sid = 0;
return 0;
}
if (old_tsec->exec_sid) {
new_tsec->sid = old_tsec->exec_sid;
/* Reset exec SID on execve. */
@ -4542,21 +4529,6 @@ static int sock_has_perm(struct sock *sk, u32 perms)
if (sksec->sid == SECINITSID_KERNEL)
return 0;
/*
* Before POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT, sockets that
* inherited the kernel context from early boot used to be skipped
* here, so preserve that behavior unless the capability is set.
*
* By setting the capability the policy signals that it is ready
* for this quirk to be fixed. Note that sockets created by a kernel
* thread or a usermode helper executed without a transition will
* still be skipped in this check regardless of the policycap
* setting.
*/
if (!selinux_policycap_userspace_initial_context() &&
sksec->sid == SECINITSID_INIT)
return 0;
ad_net_init_from_sk(&ad, &net, sk);
return avc_has_perm(current_sid(), sksec->sid, sksec->sclass, perms,

2
security/selinux/include/initial_sid_to_string.h
View File

@ -10,7 +10,7 @@ static const char *const initial_sid_to_string[] = {
NULL,
"file",
NULL,
"init",
NULL,
"any_socket",
"port",
"netif",

1
security/selinux/include/policycap.h
View File

@ -12,7 +12,6 @@ enum {
POLICYDB_CAP_NNP_NOSUID_TRANSITION,
POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS,
POLICYDB_CAP_IOCTL_SKIP_CLOEXEC,
POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT,
__POLICYDB_CAP_MAX
};
#define POLICYDB_CAP_MAX (__POLICYDB_CAP_MAX - 1)

1
security/selinux/include/policycap_names.h
View File

@ -14,7 +14,6 @@ const char *const selinux_policycap_names[__POLICYDB_CAP_MAX] = {
"nnp_nosuid_transition",
"genfs_seclabel_symlinks",
"ioctl_skip_cloexec",
"userspace_initial_context",
};
#endif /* _SELINUX_POLICYCAP_NAMES_H_ */

6
security/selinux/include/security.h
View File

@ -189,12 +189,6 @@ static inline bool selinux_policycap_ioctl_skip_cloexec(void)
selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
}
static inline bool selinux_policycap_userspace_initial_context(void)
{
return READ_ONCE(
selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]);
}
struct selinux_policy_convert_data;
struct selinux_load_state {

27
security/selinux/ss/policydb.c
View File

@ -864,8 +864,6 @@ void policydb_destroy(struct policydb *p)
int policydb_load_isids(struct policydb *p, struct sidtab *s)
{
struct ocontext *head, *c;
bool isid_init_supported = ebitmap_get_bit(&p->policycaps,
POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT);
int rc;
rc = sidtab_init(s);
@ -889,13 +887,6 @@ int policydb_load_isids(struct policydb *p, struct sidtab *s)
if (!name)
continue;
/*
* Also ignore SECINITSID_INIT if the policy doesn't declare
* support for it
*/
if (sid == SECINITSID_INIT && !isid_init_supported)
continue;
rc = sidtab_set_initial(s, sid, &c->context[0]);
if (rc) {
pr_err("SELinux: unable to load initial SID %s.\n",
@ -903,24 +894,6 @@ int policydb_load_isids(struct policydb *p, struct sidtab *s)
sidtab_destroy(s);
return rc;
}
/*
* If the policy doesn't support the "userspace_initial_context"
* capability, set SECINITSID_INIT to the same context as
* SECINITSID_KERNEL. This ensures the same behavior as before
* the reintroduction of SECINITSID_INIT, where all tasks
* started before policy load would initially get the context
* corresponding to SECINITSID_KERNEL.
*/
if (sid == SECINITSID_KERNEL && !isid_init_supported) {
rc = sidtab_set_initial(s, SECINITSID_INIT, &c->context[0]);
if (rc) {
pr_err("SELinux: unable to load initial SID %s.\n",
name);
sidtab_destroy(s);
return rc;
}
}
}
return 0;
}