| 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: <723f49ea-106f-099f-117d-58357270f0c3@hartkopp.net>
Date: Thu, 11 Feb 2021 22:15:31 +0100
From: Oliver Hartkopp <socketcan@...tkopp.net>
To: kernel test robot <lkp@...el.com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
Marc Kleine-Budde <mkl@...gutronix.de>
Subject: Re: include/linux/compiler_types.h:315:38: error: call to
'__compiletime_assert_498' declared with attribute error: BUILD_BUG_ON
failed: offsetof(struct can_frame, len) != offsetof(struct canfd_frame, len)
|| offsetof(struct can_frame, data) != offsetof(struc...
Hello,
On 11.02.21 17:51, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 291009f656e8eaebbdfd3a8d99f6b190a9ce9deb
> commit: c7b74967799b1af52b3045d69d4c26836b2d41de can: replace can_dlc as variable/element for payload length
> date: 3 months ago
> config: arm-randconfig-r015-20210210 (attached as .config)
> compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
> reproduce (this is a W=1 build):
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c7b74967799b1af52b3045d69d4c26836b2d41de
This hash references to the commit ("can: replace can_dlc as
variable/element for payload length") which makes a change to the
BUILD_BUG_ON() content but this does not cause the root problem.
Going back some commits shows the commit ("can: add optional DLC element
to Classical CAN frame structure") with hash
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea7800565a128c1adafa1791ce80afd6016fe21c
is introducing the reported problem.
I assume BUILD_BUG_ON() does not work with the newly introduced union{}
in struct can_frame in this specific (arm) architecture.
There are no compile issues like this on x86.
When removing the union{} from the struct can_frame and replacing it
just with 'len' in the reported c7b74967799b1 commit, it compiles
without problems.
Regards,
Oliver
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout c7b74967799b1af52b3045d69d4c26836b2d41de
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> In file included from <command-line>:
> net/can/af_can.c: In function 'can_init':
>>> include/linux/compiler_types.h:315:38: error: call to '__compiletime_assert_498' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct can_frame, len) != offsetof(struct canfd_frame, len) || offsetof(struct can_frame, data) != offsetof(struct canfd_frame, data)
> 315 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^
> include/linux/compiler_types.h:296:4: note: in definition of macro '__compiletime_assert'
> 296 | prefix ## suffix(); \
> | ^~~~~~
> include/linux/compiler_types.h:315:2: note: in expansion of macro '_compiletime_assert'
> 315 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^~~~~~~~~~~~~~~~~~~
> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> | ^~~~~~~~~~~~~~~~~~
> include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
> | ^~~~~~~~~~~~~~~~
> net/can/af_can.c:891:2: note: in expansion of macro 'BUILD_BUG_ON'
> 891 | BUILD_BUG_ON(offsetof(struct can_frame, len) !=
> | ^~~~~~~~~~~~
>
>
> vim +/__compiletime_assert_498 +315 include/linux/compiler_types.h
>
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 301
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 302 #define _compiletime_assert(condition, msg, prefix, suffix) \
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 303 __compiletime_assert(condition, msg, prefix, suffix)
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 304
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 305 /**
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 306 * compiletime_assert - break build and emit msg if condition is false
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 307 * @condition: a compile-time constant condition to check
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 308 * @msg: a message to emit if condition is false
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 309 *
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 310 * In tradition of POSIX assert, this macro will break the build if the
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 311 * supplied condition is *false*, emitting the supplied error message if the
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 312 * compiler has support to do so.
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 313 */
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 314 #define compiletime_assert(condition, msg) \
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 @315 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> eb5c2d4b45e3d2 Will Deacon 2020-07-21 316
>
> :::::: The code at line 315 was first introduced by commit
> :::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h
>
> :::::: TO: Will Deacon <will@...nel.org>
> :::::: CC: Will Deacon <will@...nel.org>
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>
Powered by blists - more mailing lists