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Date: Wed, 4 May 2022 18:57:28 -0400
From: Paul Moore <paul@...l-moore.com>
To: Kees Cook <keescook@...omium.org>
Cc: "Gustavo A . R . Silva" <gustavoars@...nel.org>,
Steffen Klassert <steffen.klassert@...unet.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
Stephen Smalley <stephen.smalley.work@...il.com>,
Eric Paris <eparis@...isplace.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Xiu Jianfeng <xiujianfeng@...wei.com>,
Christian Göttsche <cgzones@...glemail.com>,
netdev@...r.kernel.org, selinux@...r.kernel.org,
Alexei Starovoitov <ast@...nel.org>,
alsa-devel@...a-project.org, Al Viro <viro@...iv.linux.org.uk>,
Andrew Gabbasov <andrew_gabbasov@...tor.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Gross <agross@...nel.org>,
Andy Lavr <andy.lavr@...il.com>,
Arend van Spriel <aspriel@...il.com>,
Baowen Zheng <baowen.zheng@...igine.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
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Yang Yingliang <yangyingliang@...wei.com>
Subject: Re: [PATCH 28/32] selinux: Use mem_to_flex_dup() with xfrm and sidtab
On Tue, May 3, 2022 at 9:57 PM Kees Cook <keescook@...omium.org> wrote:
>
> As part of the work to perform bounds checking on all memcpy() uses,
> replace the open-coded a deserialization of bytes out of memory into a
> trailing flexible array by using a flex_array.h helper to perform the
> allocation, bounds checking, and copying:
>
> struct xfrm_sec_ctx
> struct sidtab_str_cache
>
> Cc: Steffen Klassert <steffen.klassert@...unet.com>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Paul Moore <paul@...l-moore.com>
> Cc: Stephen Smalley <stephen.smalley.work@...il.com>
> Cc: Eric Paris <eparis@...isplace.org>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: Xiu Jianfeng <xiujianfeng@...wei.com>
> Cc: "Christian Göttsche" <cgzones@...glemail.com>
> Cc: netdev@...r.kernel.org
> Cc: selinux@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> include/uapi/linux/xfrm.h | 4 ++--
> security/selinux/ss/sidtab.c | 9 +++------
> security/selinux/xfrm.c | 7 ++-----
> 3 files changed, 7 insertions(+), 13 deletions(-)
>
> diff --git a/include/uapi/linux/xfrm.h b/include/uapi/linux/xfrm.h
> index 65e13a099b1a..4a6fa2beff6a 100644
> --- a/include/uapi/linux/xfrm.h
> +++ b/include/uapi/linux/xfrm.h
> @@ -31,9 +31,9 @@ struct xfrm_id {
> struct xfrm_sec_ctx {
> __u8 ctx_doi;
> __u8 ctx_alg;
> - __u16 ctx_len;
> + __DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(__u16, ctx_len);
> __u32 ctx_sid;
> - char ctx_str[0];
> + __DECLARE_FLEX_ARRAY_ELEMENTS(char, ctx_str);
> };
While I like the idea of this in principle, I'd like to hear about the
testing you've done on these patches. A previous flex array
conversion in the audit uapi headers ended up causing a problem with
GCC12 and SWIG; while it was a SWIG problem and not a kernel header
problem that was thin consolation for those with broken builds.
> diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c
> index a54b8652bfb5..a9d434e8cff7 100644
> --- a/security/selinux/ss/sidtab.c
> +++ b/security/selinux/ss/sidtab.c
> @@ -23,8 +23,8 @@ struct sidtab_str_cache {
> struct rcu_head rcu_member;
> struct list_head lru_member;
> struct sidtab_entry *parent;
> - u32 len;
> - char str[];
> + DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(u32, len);
> + DECLARE_FLEX_ARRAY_ELEMENTS(char, str);
> };
>
> #define index_to_sid(index) ((index) + SECINITSID_NUM + 1)
--
paul-moore.com
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