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Subject[RFC 1/3] abi_spec: basic definitions of constraints, args and syscalls
Date
This is a very simple definition of the syscall ABI we can build on. The idea
is to have a generic description of syscalls, their arguments and return
values we can use to audit the kernel's implementation vs the specs.

Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
---
include/uapi/linux/abi_spec.h | 58 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 58 insertions(+)
create mode 100644 include/uapi/linux/abi_spec.h

diff --git a/include/uapi/linux/abi_spec.h b/include/uapi/linux/abi_spec.h
new file mode 100644
index 0000000..ad1a992
--- /dev/null
+++ b/include/uapi/linux/abi_spec.h
@@ -0,0 +1,58 @@
+#ifndef ABI_SPEC_H_
+#define ABI_SPEC_H_
+
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#define MAX_CONSTRAINTS 10
+#define MAX_ARGS 10
+
+#define TYPE_FD 1
+#define TYPE_INT 2
+#define TYPE_PTR 3
+#define TYPE_STRING 4
+/* ... */
+
+#define CONSTRAINT_NON_NULL (1<<0)
+#define CONSTRAINT_RANGE (1<<1)
+#define CONSTRAINT_ADDRESS_TYPE (1<<2)
+#define CONSTRAINT_FD_TYPE (1<<3)
+#define CONSTRAINT_ERRNO (1<<4)
+#define CONSTRAINT_BITMASK (1<<5)
+#define CONSTRAINT_PATH (1<<6)
+/* ... */
+/* A generic constraint on an argument or a return value */
+struct constraint {
+ unsigned int flags; /* bitmask of applied constraints */
+ union {
+ struct { /* int range */
+ int int_min;
+ int int_max;
+ };
+ unsigned long bitmask; /* allowed flags bitmask */
+ unsigned long address_flags; /* Type of allowed addr */
+ unsigned long fd_flags; /* Type of allowed fd */
+ };
+};
+
+/* A generic argument (or return value) */
+struct argument {
+ const char *name;
+ int type; /* should be a nicer way to do this */
+
+ unsigned int nconstraints; /* can there be more than 1-2? */
+ struct constraint constraints[MAX_CONSTRAINTS];
+};
+
+/* A generic syscall */
+struct syscall_spec {
+ const char *name;
+ struct argument retval;
+
+ unsigned int nargs;
+ struct argument args[MAX_ARGS];
+};
+
+void abispec_check_pre(const struct syscall_spec *s, ...);
+void abispec_check_post(const struct syscall_spec *s, long retval, ...);
+
+#endif
--
2.7.4
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