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don't reallocate buffer in every audit_sockaddr()

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No need to do that more than once per process lifetime; allocating/freeing
on each sendto/accept/etc. is bloody pointless.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2008-12-09 19:50:34 -05:00
parent 7d3b56ba37
commit 4f6b434fee
1 changed files with 22 additions and 24 deletions
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44
kernel/auditsc.c
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@ -174,12 +174,6 @@ struct audit_aux_data_socketcall {
unsigned long args[0];
};
struct audit_aux_data_sockaddr {
struct audit_aux_data d;
int len;
char a[0];
};
struct audit_aux_data_fd_pair {
struct audit_aux_data d;
int fd[2];
@ -234,7 +228,8 @@ struct audit_context {
struct audit_context *previous; /* For nested syscalls */
struct audit_aux_data *aux;
struct audit_aux_data *aux_pids;
struct sockaddr_storage *sockaddr;
size_t sockaddr_len;
/* Save things to print about task_struct */
pid_t pid, ppid;
uid_t uid, euid, suid, fsuid;
@ -921,6 +916,7 @@ static inline void audit_free_context(struct audit_context *context)
free_tree_refs(context);
audit_free_aux(context);
kfree(context->filterkey);
kfree(context->sockaddr);
kfree(context);
context = previous;
} while (context);
@ -1383,13 +1379,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_format(ab, " a%d=%lx", i, axs->args[i]);
break; }
case AUDIT_SOCKADDR: {
struct audit_aux_data_sockaddr *axs = (void *)aux;
audit_log_format(ab, "saddr=");
audit_log_n_hex(ab, axs->a, axs->len);
break; }
case AUDIT_FD_PAIR: {
struct audit_aux_data_fd_pair *axs = (void *)aux;
audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
@ -1421,6 +1410,16 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_end(ab);
}
if (context->sockaddr_len) {
ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
if (ab) {
audit_log_format(ab, "saddr=");
audit_log_n_hex(ab, (void *)context->sockaddr,
context->sockaddr_len);
audit_log_end(ab);
}
}
for (aux = context->aux_pids; aux; aux = aux->next) {
struct audit_aux_data_pids *axs = (void *)aux;
@ -1689,6 +1688,7 @@ void audit_syscall_exit(int valid, long return_code)
context->aux_pids = NULL;
context->target_pid = 0;
context->target_sid = 0;
context->sockaddr_len = 0;
kfree(context->filterkey);
context->filterkey = NULL;
tsk->audit_context = context;
@ -2468,22 +2468,20 @@ int __audit_fd_pair(int fd1, int fd2)
*/
int audit_sockaddr(int len, void *a)
{
struct audit_aux_data_sockaddr *ax;
struct audit_context *context = current->audit_context;
if (likely(!context || context->dummy))
return 0;
ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL);
if (!ax)
if (!context->sockaddr) {
void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
if (!p)
return -ENOMEM;
context->sockaddr = p;
}
ax->len = len;
memcpy(ax->a, a, len);
ax->d.type = AUDIT_SOCKADDR;
ax->d.next = context->aux;
context->aux = (void *)ax;
context->sockaddr_len = len;
memcpy(context->sockaddr, a, len);
return 0;
}