microblaze: Add seccomp support

Add seccomp support.

Signed-off-by: Michal Simek <monstr@monstr.eu>

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 692fdfc..dad40fc 100644 (file)
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -121,6 +121,23 @@ config CMDLINE_FORCE
          Set this to have arguments from the default kernel command string
          override those passed by the boot loader.
 
+config SECCOMP
+       bool "Enable seccomp to safely compute untrusted bytecode"
+       depends on PROC_FS
+       default y
+       help
+         This kernel feature is useful for number crunching applications
+         that may need to compute untrusted bytecode during their
+         execution. By using pipes or other transports made available to
+         the process as file descriptors supporting the read/write
+         syscalls, it's possible to isolate those applications in
+         their own address space using seccomp. Once seccomp is
+         enabled via /proc/<pid>/seccomp, it cannot be disabled
+         and the task is only allowed to execute a few safe syscalls
+         defined by each seccomp mode.
+
+         If unsure, say Y. Only embedded should say N here.
+
 endmenu
 
 menu "Advanced setup"

diff --git a/arch/microblaze/include/asm/seccomp.h b/arch/microblaze/include/asm/seccomp.h
new file mode 100644 (file)
index 0000000..0d91275
--- /dev/null
+++ b/arch/microblaze/include/asm/seccomp.h
@@ -0,0 +1,16 @@
+#ifndef _ASM_MICROBLAZE_SECCOMP_H
+#define _ASM_MICROBLAZE_SECCOMP_H
+
+#include <linux/unistd.h>
+
+#define __NR_seccomp_read              __NR_read
+#define __NR_seccomp_write             __NR_write
+#define __NR_seccomp_exit              __NR_exit
+#define __NR_seccomp_sigreturn         __NR_sigreturn
+
+#define __NR_seccomp_read_32           __NR_read
+#define __NR_seccomp_write_32          __NR_write
+#define __NR_seccomp_exit_32           __NR_exit
+#define __NR_seccomp_sigreturn_32      __NR_sigreturn
+
+#endif /* _ASM_MICROBLAZE_SECCOMP_H */