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>
diff --git a/include/linux/prctl.h b/include/linux/prctl.h
index 52a9be4..e2eff90 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 */
diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index 3e8b1cf..d708974 100644
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -4,8 +4,6 @@
#ifdef CONFIG_SECCOMP
-#define NR_SECCOMP_MODES 1
-
#include <linux/thread_info.h>
#include <asm/seccomp.h>
@@ -23,6 +21,9 @@
return unlikely(test_ti_thread_flag(ti, TIF_SECCOMP));
}
+extern long prctl_get_seccomp(void);
+extern long prctl_set_seccomp(unsigned long);
+
#else /* CONFIG_SECCOMP */
typedef struct { } seccomp_t;
@@ -34,6 +35,16 @@
return 0;
}
+static inline long prctl_get_seccomp(void)
+{
+ return -EINVAL;
+}
+
+static inline long prctl_set_seccomp(unsigned long arg2)
+{
+ return -EINVAL;
+}
+
#endif /* CONFIG_SECCOMP */
#endif /* _LINUX_SECCOMP_H */