microblaze: Add seccomp support

Add seccomp support.

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

2 files changed, 33 insertions, 0 deletions

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 692fdfce2a23..dad40fc2bef8 100644
--- 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
index 000000000000..0d912758a0d7
--- /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 */