if (task_no_new_privs(current))
bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS;
+ /*
+ * If another task is sharing our fs, we cannot safely
+ * suid exec because the differently privileged task
+ * will be able to manipulate the current directory, etc.
+ * It would be nice to force an unshare instead...
+ */
t = p;
n_fs = 1;
spin_lock(&p->fs->lock);
return retval;
}
+/* binfmt handlers will call back into begin_new_exec() on success. */
static int exec_binprm(struct linux_binprm *bprm)
{
pid_t old_pid, old_vpid;
if (retval)
return retval;
+ /*
+ * Check for unsafe execution states before exec_binprm(), which
+ * will call back into begin_new_exec(), into bprm_creds_from_file(),
+ * where setuid-ness is evaluated.
+ */
check_unsafe_exec(bprm);
current->in_execve = 1;