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Sun, 13 Apr 2025 18:13:49 -0700 (PDT) Sender: Guenter Roeck From: Guenter Roeck To: Andrey Ryabinin Cc: Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, Guenter Roeck , Linus Torvalds Subject: [RFC PATCH] x86/Kconfig: Fix allyesconfig Date: Sun, 13 Apr 2025 18:13:45 -0700 Message-ID: <20250414011345.2602656-1-linux@roeck-us.net> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 64-bit allyesconfig builds fail with x86_64-linux-ld: kernel image bigger than KERNEL_IMAGE_SIZE Bisect points to commit 6f110a5e4f99 ("Disable SLUB_TINY for build testing") as the responsible commit. Reverting that patch does indeed fix the problem. Further analysis shows that disabling SLUB_TINY enables CONFIG_KASAN, and that CONFIG_KASAN is responsible for the image size increase. Solve the test build problem by selectively disabling CONFIG_KASAN for 'allyesconfig' build tests of 64-bit X86 builds. Fixes: 6f110a5e4f99 ("Disable SLUB_TINY for build testing") Cc: Linus Torvalds Signed-off-by: Guenter Roeck --- RFC: Maybe there is a better solution for the problem. Even increasing the maximum image size to 1.5GB did not help. Also, maybe there is a better way to determine if this is an "allyesconfig" build test. On top of that, I am not sure if the "Fixes" tag is really appropriate. lib/Kconfig.kasan | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index f82889a830fa..fb87c40798cd 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -31,6 +31,10 @@ config CC_HAS_KASAN_SW_TAGS config CC_HAS_WORKING_NOSANITIZE_ADDRESS def_bool !CC_IS_GCC || GCC_VERSION >=3D 80300 =20 +config KASAN_COMPILE_TEST + tristate "KASAN compile test" + depends on COMPILE_TEST && 64BIT && X86 + menuconfig KASAN bool "KASAN: dynamic memory safety error detector" depends on (((HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) || \ @@ -38,6 +42,7 @@ menuconfig KASAN CC_HAS_WORKING_NOSANITIZE_ADDRESS) || \ HAVE_ARCH_KASAN_HW_TAGS depends on SYSFS && !SLUB_TINY + depends on KASAN_COMPILE_TEST!=3Dy select STACKDEPOT_ALWAYS_INIT help Enables KASAN (Kernel Address Sanitizer) - a dynamic memory safety --=20 2.45.2