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capabilities: introduce security_capable_noaudit

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Exactly like security_capable except don't audit any denials.  This is for
places where the kernel may make decisions about what to do if a task has a
given capability, but which failing that capability is not a sign of a
security policy violation.  An example is checking if a task has
CAP_SYS_ADMIN to lower it's likelyhood of being killed by the oom killer.
This check is not a security violation if it is denied.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com>
This commit is contained in:
Eric Paris
2012-01-03 12:25:15 -05:00
parent b7e724d303
commit c7eba4a975
2 changed files with 13 additions and 0 deletions
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7
include/linux/security.h
View File

@@ -1668,6 +1668,8 @@ int security_capset(struct cred *new, const struct cred *old,
const kernel_cap_t *permitted); const kernel_cap_t *permitted);
int security_capable(const struct cred *cred, struct user_namespace *ns, int security_capable(const struct cred *cred, struct user_namespace *ns,
int cap); int cap);
int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns,
int cap);
int security_real_capable(struct task_struct *tsk, struct user_namespace *ns, int security_real_capable(struct task_struct *tsk, struct user_namespace *ns,
int cap); int cap);
int security_real_capable_noaudit(struct task_struct *tsk, int security_real_capable_noaudit(struct task_struct *tsk,
@@ -1869,6 +1871,11 @@ static inline int security_capable(const struct cred *cred,
return cap_capable(cred, ns, cap, SECURITY_CAP_AUDIT); return cap_capable(cred, ns, cap, SECURITY_CAP_AUDIT);
} }
static inline int security_capable_noaudit(const struct cred *cred,
struct user_namespace *ns, int cap) {
return cap_capable(cred, ns, cap, SECURITY_CAP_NOAUDIT);
}
static inline int security_real_capable(struct task_struct *tsk, struct user_namespace *ns, int cap) static inline int security_real_capable(struct task_struct *tsk, struct user_namespace *ns, int cap)
{ {
int ret; int ret;

6
security/security.c
View File

@@ -160,6 +160,12 @@ int security_capable(const struct cred *cred, struct user_namespace *ns,
return security_ops->capable(cred, ns, cap, SECURITY_CAP_AUDIT); return security_ops->capable(cred, ns, cap, SECURITY_CAP_AUDIT);
} }
int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns,
int cap)
{
return security_ops->capable(cred, ns, cap, SECURITY_CAP_NOAUDIT);
}
int security_real_capable(struct task_struct *tsk, struct user_namespace *ns, int security_real_capable(struct task_struct *tsk, struct user_namespace *ns,
int cap) int cap)
{ {