diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/capability.h | 17 | ||||
| -rw-r--r-- | include/linux/security.h | 41 |
2 files changed, 47 insertions, 11 deletions
diff --git a/include/linux/capability.h b/include/linux/capability.h index e22f48c2a46..02bdb768d43 100644 --- a/include/linux/capability.h +++ b/include/linux/capability.h @@ -529,8 +529,21 @@ extern const kernel_cap_t __cap_init_eff_set; * * Note that this does not set PF_SUPERPRIV on the task. */ -#define has_capability(t, cap) (security_capable((t), (cap)) == 0) -#define has_capability_noaudit(t, cap) (security_capable_noaudit((t), (cap)) == 0) +#define has_capability(t, cap) (security_real_capable((t), (cap)) == 0) + +/** + * has_capability_noaudit - Determine if a task has a superior capability available (unaudited) + * @t: The task in question + * @cap: The capability to be tested for + * + * Return true if the specified task has the given superior capability + * currently in effect, false if not, but don't write an audit message for the + * check. + * + * Note that this does not set PF_SUPERPRIV on the task. + */ +#define has_capability_noaudit(t, cap) \ + (security_real_capable_noaudit((t), (cap)) == 0) extern int capable(int cap); diff --git a/include/linux/security.h b/include/linux/security.h index 3416cb85e77..f9c390494f1 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -48,7 +48,8 @@ struct audit_krule; * These functions are in security/capability.c and are used * as the default capabilities functions */ -extern int cap_capable(struct task_struct *tsk, int cap, int audit); +extern int cap_capable(struct task_struct *tsk, const struct cred *cred, + int cap, int audit); extern int cap_settime(struct timespec *ts, struct timezone *tz); extern int cap_ptrace_may_access(struct task_struct *child, unsigned int mode); extern int cap_ptrace_traceme(struct task_struct *parent); @@ -1195,9 +1196,12 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts) * @permitted contains the permitted capability set. * Return 0 and update @new if permission is granted. * @capable: - * Check whether the @tsk process has the @cap capability. + * Check whether the @tsk process has the @cap capability in the indicated + * credentials. * @tsk contains the task_struct for the process. + * @cred contains the credentials to use. * @cap contains the capability <include/linux/capability.h>. + * @audit: Whether to write an audit message or not * Return 0 if the capability is granted for @tsk. * @acct: * Check permission before enabling or disabling process accounting. If @@ -1290,7 +1294,8 @@ struct security_operations { const kernel_cap_t *effective, const kernel_cap_t *inheritable, const kernel_cap_t *permitted); - int (*capable) (struct task_struct *tsk, int cap, int audit); + int (*capable) (struct task_struct *tsk, const struct cred *cred, + int cap, int audit); int (*acct) (struct file *file); int (*sysctl) (struct ctl_table *table, int op); int (*quotactl) (int cmds, int type, int id, struct super_block *sb); @@ -1556,8 +1561,9 @@ int security_capset(struct cred *new, const struct cred *old, const kernel_cap_t *effective, const kernel_cap_t *inheritable, const kernel_cap_t *permitted); -int security_capable(struct task_struct *tsk, int cap); -int security_capable_noaudit(struct task_struct *tsk, int cap); +int security_capable(int cap); +int security_real_capable(struct task_struct *tsk, int cap); +int security_real_capable_noaudit(struct task_struct *tsk, int cap); int security_acct(struct file *file); int security_sysctl(struct ctl_table *table, int op); int security_quotactl(int cmds, int type, int id, struct super_block *sb); @@ -1754,14 +1760,31 @@ static inline int security_capset(struct cred *new, return cap_capset(new, old, effective, inheritable, permitted); } -static inline int security_capable(struct task_struct *tsk, int cap) +static inline int security_capable(int cap) { - return cap_capable(tsk, cap, SECURITY_CAP_AUDIT); + return cap_capable(current, current_cred(), cap, SECURITY_CAP_AUDIT); } -static inline int security_capable_noaudit(struct task_struct *tsk, int cap) +static inline int security_real_capable(struct task_struct *tsk, int cap) { - return cap_capable(tsk, cap, SECURITY_CAP_NOAUDIT); + int ret; + + rcu_read_lock(); + ret = cap_capable(tsk, __task_cred(tsk), cap, SECURITY_CAP_AUDIT); + rcu_read_unlock(); + return ret; +} + +static inline +int security_real_capable_noaudit(struct task_struct *tsk, int cap) +{ + int ret; + + rcu_read_lock(); + ret = cap_capable(tsk, __task_cred(tsk), cap, + SECURITY_CAP_NOAUDIT); + rcu_read_unlock(); + return ret; } static inline int security_acct(struct file *file) |