Re: [RFC 1/3] abi_spec: basic definitions of constraints, args and syscalls

[Steven Rostedt]

On Wed, 16 Nov 2016 17:37:00 +0000
alexander.levin@xxxxxxxxxxx wrote:

> 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@xxxxxxxxxxx>
> ---
>  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
> +

I'm curious to where you picked the number 10 from? Actually, I was
doing some work with the syscall_get_arguments() and the max syscall
arguments is currently set to 6. Anything greater causes a bug.

-- Steve