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sanitize audit_log_capset() 

* no allocations
* return void
* don't duplicate checked for dummy context

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-01-04 14:52:57 -05:00
parent 157cf649a7
commit 57f71a0af4
3 changed files with 21 additions and 36 deletions
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9
include/linux/audit.h
View File

@ -457,7 +457,7 @@ extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
const struct cred *new,
const struct cred *old);
extern int __audit_log_capset(pid_t pid, const struct cred *new, const struct cred *old);
extern void __audit_log_capset(pid_t pid, const struct cred *new, const struct cred *old);
static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
{
@ -504,12 +504,11 @@ static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
return 0;
}
static inline int audit_log_capset(pid_t pid, const struct cred *new,
static inline void audit_log_capset(pid_t pid, const struct cred *new,
const struct cred *old)
{
if (unlikely(!audit_dummy_context()))
return __audit_log_capset(pid, new, old);
return 0;
__audit_log_capset(pid, new, old);
}
extern int audit_n_rules;
@ -544,7 +543,7 @@ extern int audit_signals;
#define audit_mq_notify(d,n) ((void)0)
#define audit_mq_getsetattr(d,s) ((void)0)
#define audit_log_bprm_fcaps(b, ncr, ocr) ({ 0; })
#define audit_log_capset(pid, ncr, ocr) ({ 0; })
#define audit_log_capset(pid, ncr, ocr) ((void)0)
#define audit_ptrace(t) ((void)0)
#define audit_n_rules 0
#define audit_signals 0

44
kernel/auditsc.c
View File

@ -235,6 +235,10 @@ struct audit_context {
mode_t mode;
struct mq_attr attr;
} mq_open;
struct {
pid_t pid;
struct audit_cap_data cap;
} capset;
};
int fds[2];
@ -1291,6 +1295,12 @@ static void show_special(struct audit_context *context, int *call_panic)
attr->mq_flags, attr->mq_maxmsg,
attr->mq_msgsize, attr->mq_curmsgs);
break; }
case AUDIT_CAPSET: {
audit_log_format(ab, "pid=%d", context->capset.pid);
audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
break; }
}
audit_log_end(ab);
}
@ -1392,14 +1402,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
break; }
case AUDIT_CAPSET: {
struct audit_aux_data_capset *axs = (void *)aux;
audit_log_format(ab, "pid=%d", axs->pid);
audit_log_cap(ab, "cap_pi", &axs->cap.inheritable);
audit_log_cap(ab, "cap_pp", &axs->cap.permitted);
audit_log_cap(ab, "cap_pe", &axs->cap.effective);
break; }
}
audit_log_end(ab);
}
@ -2456,29 +2458,15 @@ int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
* Record the aguments userspace sent to sys_capset for later printing by the
* audit system if applicable
*/
int __audit_log_capset(pid_t pid,
void __audit_log_capset(pid_t pid,
const struct cred *new, const struct cred *old)
{
struct audit_aux_data_capset *ax;
struct audit_context *context = current->audit_context;
if (likely(!audit_enabled || !context || context->dummy))
return 0;
ax = kmalloc(sizeof(*ax), GFP_KERNEL);
if (!ax)
return -ENOMEM;
ax->d.type = AUDIT_CAPSET;
ax->d.next = context->aux;
context->aux = (void *)ax;
ax->pid = pid;
ax->cap.effective = new->cap_effective;
ax->cap.inheritable = new->cap_effective;
ax->cap.permitted = new->cap_permitted;
return 0;
context->capset.pid = pid;
context->capset.cap.effective = new->cap_effective;
context->capset.cap.inheritable = new->cap_effective;
context->capset.cap.permitted = new->cap_permitted;
context->type = AUDIT_CAPSET;
}
/**

4
kernel/capability.c
View File

@ -280,9 +280,7 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
if (ret < 0)
goto error;
ret = audit_log_capset(pid, new, current_cred());
if (ret < 0)
return ret;
audit_log_capset(pid, new, current_cred());
return commit_creds(new);