| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20240801221427.GA3773553@thelio-3990X>
Date: Thu, 1 Aug 2024 15:14:27 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: kernel test robot <lkp@...el.com>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>, llvm@...ts.linux.dev,
oe-kbuild-all@...ts.linux.dev, LKML <linux-kernel@...r.kernel.org>,
Brian Cain <bcain@...cinc.com>, linux-hexagon@...r.kernel.org
Subject: Re: [gustavoars:testing/wfamnae-next20240729-cbc-2 11/18]
include/rdma/uverbs_ioctl.h:643:15: error: static assertion failed due to
requirement '__builtin_offsetof(struct uverbs_attr_bundle, attrs) ==
sizeof(struct uverbs_attr_bundle_hdr)': struct member likely outside of
struct_group_tagged()
On Thu, Aug 01, 2024 at 02:17:50PM -0600, Gustavo A. R. Silva wrote:
>
>
> On 01/08/24 13:08, Nathan Chancellor wrote:
> > On Thu, Aug 01, 2024 at 06:47:58AM -0600, Gustavo A. R. Silva wrote:
> > >
> > >
> > > On 01/08/24 05:35, kernel test robot wrote:
> > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/wfamnae-next20240729-cbc-2
> > > > head: df15c862c1b93b6e1f6c90b0d7971f7a6ad66751
> > > > commit: e7cd9f429a852fb7e37a706c7d08fc36e7863e06 [11/18] RDMA/uverbs: Use static_assert() to check struct sizes
> > > > config: hexagon-randconfig-001-20240801 (https://download.01.org/0day-ci/archive/20240801/202408011956.wscyBwq6-lkp@intel.com/config)
> > > > compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 430b90f04533b099d788db2668176038be38c53b)
> > >
> > >
> > > Clang 20.0.0?? (thinkingface)
> >
> > Indeed, Clang 19 branched and main is now 20 :)
> >
> > https://github.com/llvm/llvm-project/commit/8f701b5df0adb3a2960d78ca2ad9cf53f39ba2fe
>
> Yeah, but is that a stable release?
No, but the Intel folks have tested tip of tree LLVM against the kernel
for us for a few years now to try and catch issues such as this.
> BTW, I don't see GCC reporting the same problem below:
Hexagon does not have a GCC backend anymore so it is not going to be
possible to do an exact A/B comparison with this configuration but...
> > > > > > include/rdma/uverbs_ioctl.h:643:15: error: static assertion failed due to requirement '__builtin_offsetof(struct uverbs_attr_bundle, attrs) == sizeof(struct uverbs_attr_bundle_hdr)': struct member likely outside of struct_group_tagged()
> > > > 643 | static_assert(offsetof(struct uverbs_attr_bundle, attrs) == sizeof(struct uverbs_attr_bundle_hdr),
> > > > | ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > 644 | "struct member likely outside of struct_group_tagged()");
> > > > | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > include/linux/stddef.h:16:32: note: expanded from macro 'offsetof'
> > > > 16 | #define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
> > > > | ^
> > > > include/linux/build_bug.h:77:50: note: expanded from macro 'static_assert'
> > > > 77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> > > > | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > include/linux/build_bug.h:78:56: note: expanded from macro '__static_assert'
> > > > 78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> > > > | ^~~~
> > > > include/rdma/uverbs_ioctl.h:643:58: note: expression evaluates to '56 == 52'
This seems to give some indication that perhaps there may be some
architecture specific here with padding maybe? I seem to recall ARM OABI
having something similar. Adding the Hexagon folks/list to get some more
clarification. Full warning and context:
https://lore.kernel.org/202408011956.wscyBwq6-lkp@intel.com/
The problematic section preprocessed since sometimes the macros
obfuscate things:
struct uverbs_attr_bundle {
union {
struct {
struct ib_udata driver_udata;
struct ib_udata ucore;
struct ib_uverbs_file *ufile;
struct ib_ucontext *context;
struct ib_uobject *uobject;
unsigned long attr_present[(((UVERBS_API_ATTR_BKEY_LEN) +
((sizeof(long) * 8)) - 1) /
((sizeof(long) * 8)))];
};
struct uverbs_attr_bundle_hdr {
struct ib_udata driver_udata;
struct ib_udata ucore;
struct ib_uverbs_file *ufile;
struct ib_ucontext *context;
struct ib_uobject *uobject;
unsigned long attr_present[(((UVERBS_API_ATTR_BKEY_LEN) +
((sizeof(long) * 8)) - 1) /
((sizeof(long) * 8)))];
} hdr;
};
struct uverbs_attr attrs[];
};
_Static_assert(__builtin_offsetof(struct uverbs_attr_bundle, attrs) ==
sizeof(struct uverbs_attr_bundle_hdr),
"struct member likely outside of struct_group_tagged()");
FWIW, I see this with all versions of Clang that the kernel supports
with this configuration.
Cheers,
Nathan
> > > > 643 | static_assert(offsetof(struct uverbs_attr_bundle, attrs) == sizeof(struct uverbs_attr_bundle_hdr),
> > > > | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > 644 | "struct member likely outside of struct_group_tagged()");
> > > > | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > include/linux/build_bug.h:77:50: note: expanded from macro 'static_assert'
> > > > 77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> > > > | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > include/linux/build_bug.h:78:56: note: expanded from macro '__static_assert'
> > > > 78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> > > > | ^~~~
> > > > 7 warnings and 1 error generated.
> > > >
> > > >
> > > > vim +643 include/rdma/uverbs_ioctl.h
> > > >
> > > > 630
> > > > 631 struct uverbs_attr_bundle {
> > > > 632 /* New members MUST be added within the struct_group() macro below. */
> > > > 633 struct_group_tagged(uverbs_attr_bundle_hdr, hdr,
> > > > 634 struct ib_udata driver_udata;
> > > > 635 struct ib_udata ucore;
> > > > 636 struct ib_uverbs_file *ufile;
> > > > 637 struct ib_ucontext *context;
> > > > 638 struct ib_uobject *uobject;
> > > > 639 DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN);
> > > > 640 );
> > > > 641 struct uverbs_attr attrs[];
> > > > 642 };
> > > > > 643 static_assert(offsetof(struct uverbs_attr_bundle, attrs) == sizeof(struct uverbs_attr_bundle_hdr),
> > > > 644 "struct member likely outside of struct_group_tagged()");
> > > > 645
> > > >
> > >
>
> Thanks
> --
> Gustavo
Powered by blists - more mailing lists