* [kees:for-next/hardening 6/14] mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int'
@ 2025-05-07 5:49 kernel test robot
0 siblings, 0 replies; 3+ messages in thread
From: kernel test robot @ 2025-05-07 5:49 UTC (permalink / raw)
To: oe-kbuild; +Cc: lkp
::::::
:::::: Manual check reason: "only suspicious fbc files changed"
::::::
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Kees Cook <kees@kernel.org>
CC: Nathan Chancellor <nathan@kernel.org>
CC: Christoph Hellwig <hch@lst.de>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening
head: 48b79238694db6e7eb3dd6153cf71107db624a11
commit: 1ca6c23046d30abfe57d8706248ad5888aafa3bf [6/14] kbuild: Switch from -Wvla to -Wvla-larger-than=1
:::::: branch date: 33 hours ago
:::::: commit date: 9 days ago
config: arm64-randconfig-002-20250502 (https://download.01.org/0day-ci/archive/20250507/202505071331.4iOzqmuE-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250507/202505071331.4iOzqmuE-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202505071331.4iOzqmuE-lkp@intel.com/
All warnings (new ones prefixed by >>):
mm/kasan/kasan_test_c.c: In function 'kasan_alloca_oob_right':
>> mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int' [-Wvla-larger-than=]
char alloca_array[i];
^~~~~~~~~~~~
mm/kasan/kasan_test_c.c: In function 'kasan_alloca_oob_left':
mm/kasan/kasan_test_c.c:1489:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int' [-Wvla-larger-than=]
char alloca_array[i];
^~~~~~~~~~~~
mm/kasan/kasan_test_c.c: At top level:
cc1: warning: unrecognized command line option '-Wno-vla-larger-than'
vim +1504 mm/kasan/kasan_test_c.c
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1500
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso 2020-10-13 1501 static void kasan_alloca_oob_right(struct kunit *test)
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1502 {
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1503 volatile int i = 10;
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 @1504 char alloca_array[i];
2dfd1bd992322f lib/test_kasan.c Peter Collingbourne 2022-03-24 1505 /* See comment in kasan_global_oob_right. */
f649dc0e0d7b50 lib/test_kasan.c Peter Collingbourne 2021-05-14 1506 char *volatile array = alloca_array;
f649dc0e0d7b50 lib/test_kasan.c Peter Collingbourne 2021-05-14 1507 char *p = array + i;
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1508
58b999d7a22c59 lib/test_kasan.c Andrey Konovalov 2020-11-01 1509 /* Only generic mode instruments dynamic allocas. */
da17e377723f50 lib/test_kasan.c Andrey Konovalov 2021-02-24 1510 KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
da17e377723f50 lib/test_kasan.c Andrey Konovalov 2021-02-24 1511 KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK);
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1512
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso 2020-10-13 1513 KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso 2020-10-13 1514 }
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso 2020-10-13 1515
:::::: The code at line 1504 was first introduced by commit
:::::: 00a14294bb33af533f7ac002fb20623fdd8ea0d7 kasan: add tests for alloca poisoning
:::::: TO: Paul Lawrence <paullawrence@google.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 3+ messages in thread
* [kees:for-next/hardening 6/14] mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int'
@ 2025-05-07 6:08 kernel test robot
2025-05-07 15:48 ` Kees Cook
0 siblings, 1 reply; 3+ messages in thread
From: kernel test robot @ 2025-05-07 6:08 UTC (permalink / raw)
To: Kees Cook; +Cc: oe-kbuild-all, Nathan Chancellor, Christoph Hellwig
tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening
head: 48b79238694db6e7eb3dd6153cf71107db624a11
commit: 1ca6c23046d30abfe57d8706248ad5888aafa3bf [6/14] kbuild: Switch from -Wvla to -Wvla-larger-than=1
:::::: branch date: 33 hours ago
:::::: commit date: 9 days ago
config: arm64-randconfig-002-20250502 (https://download.01.org/0day-ci/archive/20250507/202505071331.4iOzqmuE-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250507/202505071331.4iOzqmuE-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202505071331.4iOzqmuE-lkp@intel.com/
All warnings (new ones prefixed by >>):
mm/kasan/kasan_test_c.c: In function 'kasan_alloca_oob_right':
>> mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int' [-Wvla-larger-than=]
char alloca_array[i];
^~~~~~~~~~~~
mm/kasan/kasan_test_c.c: In function 'kasan_alloca_oob_left':
mm/kasan/kasan_test_c.c:1489:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int' [-Wvla-larger-than=]
char alloca_array[i];
^~~~~~~~~~~~
mm/kasan/kasan_test_c.c: At top level:
cc1: warning: unrecognized command line option '-Wno-vla-larger-than'
vim +1504 mm/kasan/kasan_test_c.c
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1500
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso 2020-10-13 1501 static void kasan_alloca_oob_right(struct kunit *test)
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1502 {
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1503 volatile int i = 10;
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 @1504 char alloca_array[i];
2dfd1bd992322f lib/test_kasan.c Peter Collingbourne 2022-03-24 1505 /* See comment in kasan_global_oob_right. */
f649dc0e0d7b50 lib/test_kasan.c Peter Collingbourne 2021-05-14 1506 char *volatile array = alloca_array;
f649dc0e0d7b50 lib/test_kasan.c Peter Collingbourne 2021-05-14 1507 char *p = array + i;
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1508
58b999d7a22c59 lib/test_kasan.c Andrey Konovalov 2020-11-01 1509 /* Only generic mode instruments dynamic allocas. */
da17e377723f50 lib/test_kasan.c Andrey Konovalov 2021-02-24 1510 KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
da17e377723f50 lib/test_kasan.c Andrey Konovalov 2021-02-24 1511 KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK);
00a14294bb33af lib/test_kasan.c Paul Lawrence 2018-02-06 1512
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso 2020-10-13 1513 KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso 2020-10-13 1514 }
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso 2020-10-13 1515
:::::: The code at line 1504 was first introduced by commit
:::::: 00a14294bb33af533f7ac002fb20623fdd8ea0d7 kasan: add tests for alloca poisoning
:::::: TO: Paul Lawrence <paullawrence@google.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [kees:for-next/hardening 6/14] mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int'
2025-05-07 6:08 [kees:for-next/hardening 6/14] mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int' kernel test robot
@ 2025-05-07 15:48 ` Kees Cook
0 siblings, 0 replies; 3+ messages in thread
From: Kees Cook @ 2025-05-07 15:48 UTC (permalink / raw)
To: kernel test robot
Cc: oe-kbuild-all, Nathan Chancellor, Christoph Hellwig,
Arnd Bergmann, linux-hardening
On Wed, May 07, 2025 at 02:08:26PM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening
> head: 48b79238694db6e7eb3dd6153cf71107db624a11
> commit: 1ca6c23046d30abfe57d8706248ad5888aafa3bf [6/14] kbuild: Switch from -Wvla to -Wvla-larger-than=1
> :::::: branch date: 33 hours ago
> :::::: commit date: 9 days ago
> config: arm64-randconfig-002-20250502 (https://download.01.org/0day-ci/archive/20250507/202505071331.4iOzqmuE-lkp@intel.com/config)
> compiler: aarch64-linux-gcc (GCC) 8.5.0
> [...]
> mm/kasan/kasan_test_c.c: At top level:
> cc1: warning: unrecognized command line option '-Wno-vla-larger-than'
Man, GCC 8 and this option is pretty broken. I've update the patch
again to just do option removal instead of traditional warning
disabling:
https://web.git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?h=for-next/hardening&id=a81be1e542c0f35e171bc564d8b60785a12cff29
Thanks!
--
Kees Cook
^ permalink raw reply [flat|nested] 3+ messages in thread
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2025-05-07 6:08 [kees:for-next/hardening 6/14] mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int' kernel test robot
2025-05-07 15:48 ` Kees Cook
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