Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
new file mode 100644
index 0000000..c3391b6
--- /dev/null
+++ b/kernel/seccomp.c
@@ -0,0 +1,56 @@
+/*
+ * linux/kernel/seccomp.c
+ *
+ * Copyright 2004-2005 Andrea Arcangeli <andrea@cpushare.com>
+ *
+ * This defines a simple but solid secure-computing mode.
+ */
+
+#include <linux/seccomp.h>
+#include <linux/sched.h>
+
+/* #define SECCOMP_DEBUG 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 TIF_32BIT
+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 TIF_32BIT
+ if (test_thread_flag(TIF_32BIT))
+ syscall = mode1_syscalls_32;
+#endif
+ do {
+ if (*syscall == this_syscall)
+ return;
+ } while (*++syscall);
+ break;
+ default:
+ BUG();
+ }
+
+#ifdef SECCOMP_DEBUG
+ dump_stack();
+#endif
+ do_exit(SIGKILL);
+}