linux-hardening - 2-member sized buffer structs struct

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Message-ID: <202310101614.AA6B7C4@keescook>
Date: Tue, 10 Oct 2023 16:18:56 -0700
From: Kees Cook <keescook@...omium.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-hardening@...r.kernel.org
Subject: 2-member sized buffer structs struct_size()

On Tue, Oct 10, 2023 at 03:53:28PM -0700, Kees Cook wrote:
> It's surprising how many of these 2-member structs we have in the kernel
> that do the same basic thing. :)

75. We have 75 of them:

// Options: --all-includes

@sized_byte_buffer@
identifier NAME, SIZE, ARRAY;
typedef s8, s16, s32, s64;
typedef __s8, __s16, __s32, __s64;
typedef u8, u16, u32, u64;
typedef __u8, __u16, __u32, __u64;
type SIZE_TYPE = {char, short, int, long, long long, ssize_t,
 s8, s16, s32, s64, __s8, __s16, __s32, __s64,
 unsigned char, unsigned short, unsigned int, unsigned long, unsigned long long, size_t,
 u8, u16, u32, u64, __u8, __u16, __u32, __u64};
type BYTE_TYPE = {char, unsigned char, u8, __u8};
@@

*struct NAME {
        SIZE_TYPE SIZE;
        BYTE_TYPE ARRAY[];
 };


https://paste.ubuntu.com/p/39CyK9nyqX/

Agh

-- 
Kees Cook