move seccomp from /proc to a prctl

This reduces the memory footprint and it enforces that only the current
task can enable seccomp on itself (this is a requirement for a
strightforward [modulo preempt ;) ] TIF_NOTSC implementation).

Signed-off-by: Andrea Arcangeli <andrea@cpushare.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/prctl.h b/include/linux/prctl.h
index 52a9be41250d..e2eff9079fe9 100644
--- a/include/linux/prctl.h
+++ b/include/linux/prctl.h
@@ -59,4 +59,8 @@
 # define PR_ENDIAN_LITTLE       1       /* True little endian mode */
 # define PR_ENDIAN_PPC_LITTLE   2       /* "PowerPC" pseudo little endian */
 
+/* Get/set process seccomp mode */
+#define PR_GET_SECCOMP  21
+#define PR_SET_SECCOMP  22
+
 #endif /* _LINUX_PRCTL_H */