diff options
Diffstat (limited to 'kernel/auditsc.c')
| -rw-r--r-- | kernel/auditsc.c | 111 |
1 files changed, 92 insertions, 19 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 2243c559bc03..6aff0df75568 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -89,6 +89,9 @@ extern int audit_enabled; /* number of audit rules */ int audit_n_rules; +/* determines whether we collect data for signals sent */ +int audit_signals; + /* When fs/namei.c:getname() is called, we store the pointer in name and * we don't let putname() free it (instead we free all of the saved * pointers at syscall exit time). @@ -114,6 +117,9 @@ struct audit_aux_data { #define AUDIT_AUX_IPCPERM 0 +/* Number of target pids per aux struct. */ +#define AUDIT_AUX_PIDS 16 + struct audit_aux_data_mq_open { struct audit_aux_data d; int oflag; @@ -181,6 +187,13 @@ struct audit_aux_data_path { struct vfsmount *mnt; }; +struct audit_aux_data_pids { + struct audit_aux_data d; + pid_t target_pid[AUDIT_AUX_PIDS]; + u32 target_sid[AUDIT_AUX_PIDS]; + int pid_count; +}; + /* The per-task audit context. */ struct audit_context { int dummy; /* must be the first element */ @@ -201,6 +214,7 @@ struct audit_context { struct vfsmount * pwdmnt; struct audit_context *previous; /* For nested syscalls */ struct audit_aux_data *aux; + struct audit_aux_data *aux_pids; /* Save things to print about task_struct */ pid_t pid, ppid; @@ -657,6 +671,10 @@ static inline void audit_free_aux(struct audit_context *context) context->aux = aux->next; kfree(aux); } + while ((aux = context->aux_pids)) { + context->aux_pids = aux->next; + kfree(aux); + } } static inline void audit_zero_context(struct audit_context *context, @@ -798,6 +816,29 @@ static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk audit_log_task_context(ab); } +static int audit_log_pid_context(struct audit_context *context, pid_t pid, + u32 sid) +{ + struct audit_buffer *ab; + char *s = NULL; + u32 len; + int rc = 0; + + ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); + if (!ab) + return 1; + + if (selinux_sid_to_string(sid, &s, &len)) { + audit_log_format(ab, "opid=%d obj=(none)", pid); + rc = 1; + } else + audit_log_format(ab, "opid=%d obj=%s", pid, s); + audit_log_end(ab); + kfree(s); + + return rc; +} + static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) { int i, call_panic = 0; @@ -976,23 +1017,21 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts audit_log_end(ab); } - if (context->target_pid) { - ab =audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); - if (ab) { - char *s = NULL, *t; - u32 len; - if (selinux_sid_to_string(context->target_sid, - &s, &len)) - t = "(none)"; - else - t = s; - audit_log_format(ab, "opid=%d obj=%s", - context->target_pid, t); - audit_log_end(ab); - kfree(s); - } + for (aux = context->aux_pids; aux; aux = aux->next) { + struct audit_aux_data_pids *axs = (void *)aux; + int i; + + for (i = 0; i < axs->pid_count; i++) + if (audit_log_pid_context(context, axs->target_pid[i], + axs->target_sid[i])) + call_panic = 1; } + if (context->target_pid && + audit_log_pid_context(context, context->target_pid, + context->target_sid)) + call_panic = 1; + if (context->pwd && context->pwdmnt) { ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); if (ab) { @@ -1213,7 +1252,10 @@ void audit_syscall_exit(int valid, long return_code) } else { audit_free_names(context); audit_free_aux(context); + context->aux = NULL; + context->aux_pids = NULL; context->target_pid = 0; + context->target_sid = 0; kfree(context->filterkey); context->filterkey = NULL; tsk->audit_context = context; @@ -1947,15 +1989,17 @@ int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) * If the audit subsystem is being terminated, record the task (pid) * and uid that is doing that. */ -void __audit_signal_info(int sig, struct task_struct *t) +int __audit_signal_info(int sig, struct task_struct *t) { + struct audit_aux_data_pids *axp; + struct task_struct *tsk = current; + struct audit_context *ctx = tsk->audit_context; extern pid_t audit_sig_pid; extern uid_t audit_sig_uid; extern u32 audit_sig_sid; - if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) { - struct task_struct *tsk = current; - struct audit_context *ctx = tsk->audit_context; + if (audit_pid && t->tgid == audit_pid && + (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1)) { audit_sig_pid = tsk->pid; if (ctx) audit_sig_uid = ctx->loginuid; @@ -1963,4 +2007,33 @@ void __audit_signal_info(int sig, struct task_struct *t) audit_sig_uid = tsk->uid; selinux_get_task_sid(tsk, &audit_sig_sid); } + + if (!audit_signals) /* audit_context checked in wrapper */ + return 0; + + /* optimize the common case by putting first signal recipient directly + * in audit_context */ + if (!ctx->target_pid) { + ctx->target_pid = t->tgid; + selinux_get_task_sid(t, &ctx->target_sid); + return 0; + } + + axp = (void *)ctx->aux_pids; + if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { + axp = kzalloc(sizeof(*axp), GFP_ATOMIC); + if (!axp) + return -ENOMEM; + + axp->d.type = AUDIT_OBJ_PID; + axp->d.next = ctx->aux_pids; + ctx->aux_pids = (void *)axp; + } + BUG_ON(axp->pid_count > AUDIT_AUX_PIDS); + + axp->target_pid[axp->pid_count] = t->tgid; + selinux_get_task_sid(t, &axp->target_sid[axp->pid_count]); + axp->pid_count++; + + return 0; } |