[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/kernel/seccomp.c b/ap/os/linux/linux-3.4.x/kernel/seccomp.c
new file mode 100644
index 0000000..e8d76c5
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/kernel/seccomp.c
@@ -0,0 +1,88 @@
+/*
+ * linux/kernel/seccomp.c
+ *
+ * Copyright 2004-2005 Andrea Arcangeli <andrea@cpushare.com>
+ *
+ * This defines a simple but solid secure-computing mode.
+ */
+
+#include <linux/audit.h>
+#include <linux/seccomp.h>
+#include <linux/sched.h>
+#include <linux/compat.h>
+
+/* #define SECCOMP_DEBUG 1 */
+#define NR_SECCOMP_MODES 1
+
+/*
+ * Secure computing mode 1 allows only read/write/exit/sigreturn.
+ * To be fully secure this must be combined with rlimit
+ * to limit the stack allocations too.
+ */
+static int mode1_syscalls[] = {
+ __NR_seccomp_read, __NR_seccomp_write, __NR_seccomp_exit, __NR_seccomp_sigreturn,
+ 0, /* null terminated */
+};
+
+#ifdef CONFIG_COMPAT
+static int mode1_syscalls_32[] = {
+ __NR_seccomp_read_32, __NR_seccomp_write_32, __NR_seccomp_exit_32, __NR_seccomp_sigreturn_32,
+ 0, /* null terminated */
+};
+#endif
+
+void __secure_computing(int this_syscall)
+{
+ int mode = current->seccomp.mode;
+ int * syscall;
+
+ switch (mode) {
+ case 1:
+ syscall = mode1_syscalls;
+#ifdef CONFIG_COMPAT
+ if (is_compat_task())
+ syscall = mode1_syscalls_32;
+#endif
+ do {
+ if (*syscall == this_syscall)
+ return;
+ } while (*++syscall);
+ break;
+ default:
+ BUG();
+ }
+
+#ifdef SECCOMP_DEBUG
+ dump_stack();
+#endif
+ audit_seccomp(this_syscall);
+ do_exit(SIGKILL);
+}
+
+long prctl_get_seccomp(void)
+{
+ return current->seccomp.mode;
+}
+
+long prctl_set_seccomp(unsigned long seccomp_mode)
+{
+ long ret;
+
+ /* can set it only once to be even more secure */
+ ret = -EPERM;
+ if (unlikely(current->seccomp.mode))
+ goto out;
+
+ ret = -EINVAL;
+ if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
+ current->seccomp.mode = seccomp_mode;
+ set_thread_flag(TIF_SECCOMP);
+#ifdef TIF_NOTSC
+ disable_TSC();
+#endif
+ ret = 0;
+ }
+
+ out:
+ return ret;
+}