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From: Paul Moore <paul@paul-moore.com>
To: Kees Cook <keescook@chromium.org>
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Subject: Re: [PATCH 28/32] selinux: Use mem_to_flex_dup() with xfrm and sidtab
Date: Thu, 5 May 2022 19:16:18 -0400	[thread overview]
Message-ID: <CAHC9VhT3EDCZEP1og3H_PGFETE6403HUHw7aQb_wDMwJnWeb3Q@mail.gmail.com> (raw)
In-Reply-To: <202205051124.6D80ABAE32@keescook>

On Thu, May 5, 2022 at 2:39 PM Kees Cook <keescook@chromium.org> wrote:
> On Wed, May 04, 2022 at 11:14:42PM -0400, Paul Moore wrote:
> > On Wed, May 4, 2022 at 7:34 PM Gustavo A. R. Silva
> > <gustavoars@kernel.org> wrote:
> > >
> > > Hi Paul,
> > >
> > > On Wed, May 04, 2022 at 06:57:28PM -0400, Paul Moore wrote:
> > > > On Tue, May 3, 2022 at 9:57 PM Kees Cook <keescook@chromium.org> wrote:
> > >
> > > [..]
> > >
> > > > > +++ 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
> > >
> > > I'm curious about which commit caused those problems...?
> >
> > Commit ed98ea2128b6 ("audit: replace zero-length array with
> > flexible-array member"), however, as I said earlier, the problem was
> > actually with SWIG, it just happened to be triggered by the kernel
> > commit.  There was a brief fedora-devel mail thread about the problem,
> > see the link below:
> >
> > * https://www.spinics.net/lists/fedora-devel/msg297991.html
>
> Wow, that's pretty weird -- it looks like SWIG was scraping the headers
> to build its conversions? I assume SWIG has been fixed now?

I honestly don't know, the audit userspace was hacking around it with
some header file duplication/munging last I heard, but I try to avoid
having to touch Steve's audit userspace code.

> > To reiterate, I'm supportive of changes like this, but I would like to
> > hear how it was tested to ensure there are no unexpected problems with
> > userspace.  If there are userspace problems it doesn't mean we can't
> > make changes like this, it just means we need to ensure that the
> > userspace issues are resolved first.
>
> Well, as this is the first and only report of any problems with [0] -> []
> conversions (in UAPI or anywhere) that I remember seeing, and they've
> been underway since at least v5.9, I hadn't been doing any new testing.

... and for whatever it is worth, I wasn't expecting it to be a
problem either.  Surprise :)

> So, for this case, I guess I should ask what tests you think would be
> meaningful here? Anything using #include should be fine:
> https://codesearch.debian.net/search?q=linux%2Fxfrm.h&literal=1&perpkg=1
> Which leaves just this, which may be doing something weird:
>
> libabigail_2.0-1/tests/data/test-diff-filter/test-PR27569-v0.abi
>         </data-member>
>         <data-member access="public" layout-offset-in-bits="128">
>           <var-decl name="seq_hi" type-id="3f1a6b60" visibility="default" filepath="include/uapi/linux/xfrm.h" line="97" column="1"/>
>         </data-member>
>         <data-member access="public" layout-offset-in-bits="160">
>
> But I see that SWIG doesn't show up in a search for linux/audit.h:
> https://codesearch.debian.net/search?q=linux%2Faudit.h&literal=1&perpkg=1
>
> So this may not be a sufficient analysis...

I think from a practical perspective ensuring that the major IPsec/IKE
tools, e.g. the various *SWANs, that know about labeled IPSec still
build and can set/get the SA/SPD labels correctly would be sufficient.
I seriously doubt there would be any problems, but who knows.

-- 
paul-moore.com

  reply	other threads:[~2022-05-05 23:16 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-04  1:44 [PATCH 00/32] Introduce flexible array struct memcpy() helpers Kees Cook
2022-05-04  1:44 ` [PATCH 01/32] netlink: Avoid memcpy() across flexible array boundary Kees Cook
2022-05-04  3:12   ` Introduce flexible array struct memcpy() helpers bluez.test.bot
2022-05-04  3:31   ` [PATCH 01/32] netlink: Avoid memcpy() across flexible array boundary Gustavo A. R. Silva
2022-05-04  3:37     ` Kees Cook
2022-05-04  1:44 ` [PATCH 02/32] Introduce flexible array struct memcpy() helpers Kees Cook
2022-05-04  7:25   ` Johannes Berg
2022-05-04 15:38     ` Kees Cook
2022-05-04 16:08       ` David Laight
2022-05-05 13:16       ` Johannes Berg
2022-05-05 15:16         ` Keith Packard
2022-05-05 19:32           ` Kees Cook
2022-05-05 20:08             ` Keith Packard
2022-05-05 20:12               ` Johannes Berg
2022-05-06 11:15                 ` David Laight
2022-05-06 11:15                   ` David Laight
2022-05-05 19:27         ` Kees Cook
2022-05-04  1:44 ` [PATCH 03/32] flex_array: Add Kunit tests Kees Cook
2022-05-04  3:00   ` David Gow
2022-05-04 19:43     ` Kees Cook
2022-05-04 19:58   ` Daniel Latypov
2022-05-04  1:44 ` [PATCH 04/32] fortify: Add run-time WARN for cross-field memcpy() Kees Cook
2022-05-04  1:44 ` [PATCH 05/32] brcmfmac: Use mem_to_flex_dup() with struct brcmf_fweh_queue_item Kees Cook
2022-05-16 12:49   ` Arend van Spriel
2022-05-17  3:57     ` Kees Cook
2022-05-04  1:44 ` [PATCH 06/32] iwlwifi: calib: Prepare to use mem_to_flex_dup() Kees Cook
2022-05-04  1:44 ` [PATCH 07/32] iwlwifi: calib: Use mem_to_flex_dup() with struct iwl_calib_result Kees Cook
2022-05-04  1:44 ` [PATCH 08/32] iwlwifi: mvm: Use mem_to_flex_dup() with struct ieee80211_key_conf Kees Cook
2022-05-04  1:44 ` [PATCH 09/32] p54: Use mem_to_flex_dup() with struct p54_cal_database Kees Cook
2022-05-04  1:44 ` [PATCH 10/32] wcn36xx: Use mem_to_flex_dup() with struct wcn36xx_hal_ind_msg Kees Cook
2022-05-04  5:42   ` Kalle Valo
2022-05-04 15:08     ` Kees Cook
2022-05-04  1:44 ` [PATCH 11/32] nl80211: Use mem_to_flex_dup() with struct cfg80211_cqm_config Kees Cook
2022-05-04  1:44 ` [PATCH 12/32] cfg80211: Use mem_to_flex_dup() with struct cfg80211_bss_ies Kees Cook
2022-05-04  7:28   ` Johannes Berg
2022-05-04 15:13     ` Kees Cook
2022-05-04  1:44 ` [PATCH 13/32] mac80211: Use mem_to_flex_dup() with several structs Kees Cook
2022-05-04  1:44 ` [PATCH 14/32] af_unix: Use mem_to_flex_dup() with struct unix_address Kees Cook
2022-05-04  1:44 ` [PATCH 15/32] 802/garp: Use mem_to_flex_dup() with struct garp_attr Kees Cook
2022-05-04  1:44 ` [PATCH 16/32] 802/mrp: Use mem_to_flex_dup() with struct mrp_attr Kees Cook
2022-05-04  1:44 ` [PATCH 17/32] net/flow_offload: Use mem_to_flex_dup() with struct flow_action_cookie Kees Cook
2022-05-04  1:44 ` [PATCH 18/32] firewire: Use __mem_to_flex_dup() with struct iso_interrupt_event Kees Cook
2022-05-04  1:44 ` [PATCH 19/32] afs: Use mem_to_flex_dup() with struct afs_acl Kees Cook
2022-05-04  1:44 ` [PATCH 20/32] ASoC: sigmadsp: Use mem_to_flex_dup() with struct sigmadsp_data Kees Cook
2022-05-04 15:17   ` Mark Brown
2022-05-04  1:44 ` [PATCH 21/32] soc: qcom: apr: Use mem_to_flex_dup() with struct apr_rx_buf Kees Cook
2022-05-04  1:44 ` [PATCH 22/32] atags_proc: Use mem_to_flex_dup() with struct buffer Kees Cook
2022-05-04  1:44 ` [PATCH 23/32] Bluetooth: Use mem_to_flex_dup() with struct hci_op_configure_data_path Kees Cook
2022-05-04  1:44 ` [PATCH 24/32] IB/hfi1: Use mem_to_flex_dup() for struct tid_rb_node Kees Cook
2022-05-04  1:44 ` [PATCH 25/32] Drivers: hv: utils: Use mem_to_flex_dup() with struct cn_msg Kees Cook
2022-05-04  1:44 ` [PATCH 26/32] ima: Use mem_to_flex_dup() with struct modsig Kees Cook
2022-05-04  1:44 ` [PATCH 27/32] KEYS: Use mem_to_flex_dup() with struct user_key_payload Kees Cook
2022-05-04  1:44 ` [PATCH 28/32] selinux: Use mem_to_flex_dup() with xfrm and sidtab Kees Cook
2022-05-04 22:57   ` Paul Moore
2022-05-04 23:43     ` Gustavo A. R. Silva
2022-05-05  3:14       ` Paul Moore
2022-05-05 18:39         ` Kees Cook
2022-05-05 23:16           ` Paul Moore [this message]
2022-05-06  1:08             ` Gustavo A. R. Silva
2022-05-04  1:44 ` [PATCH 29/32] xtensa: Use mem_to_flex_dup() with struct property Kees Cook
2022-05-04 18:09   ` Rob Herring
2022-05-04 18:09     ` Rob Herring
2022-05-04  1:44 ` [PATCH 30/32] usb: gadget: f_fs: Use mem_to_flex_dup() with struct ffs_buffer Kees Cook
2022-05-04  1:44 ` [PATCH 31/32] xenbus: Use mem_to_flex_dup() with struct read_buffer Kees Cook
2022-05-04  1:44 ` [PATCH 32/32] esas2r: Use __mem_to_flex() with struct atto_ioctl Kees Cook
2022-05-12 21:41 ` [PATCH 19/32] afs: Use mem_to_flex_dup() with struct afs_acl David Howells
2022-05-12 21:41   ` David Howells
2022-05-13 15:44   ` Kees Cook
2022-05-13 15:44     ` Kees Cook
2022-05-12 21:47 ` [PATCH 00/32] Introduce flexible array struct memcpy() helpers David Howells
2022-05-12 21:47   ` David Howells

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all data and code used by this external index.