From: Dan Carpenter <dan.carpenter@linaro.org>
To: oe-kbuild@lists.linux.dev, Leon Hwang <leon.hwang@linux.dev>,
bpf@vger.kernel.org
Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@fomichev.me>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
Puranjay Mohan <puranjay@kernel.org>,
Xu Kuohai <xukuohai@huaweicloud.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Thomas Gleixner <tglx@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
Shuah Khan <skhan@linuxfoundation.org>,
Leon Hwang <leon.hwang@linux.dev>,
Peilin Ye <yepeilin@google.com>,
Luis Gerhorst <luis.gerhorst@fau.de>,
Viktor Malik <vmalik@redhat.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH bpf-next v2 1/6] bpf: Introduce 64-bit bitops kfuncs
Date: Sat, 21 Feb 2026 12:58:02 +0300 [thread overview]
Message-ID: <202602210241.E7Q88vvq-lkp@intel.com> (raw)
In-Reply-To: <20260219142933.13904-2-leon.hwang@linux.dev>
Hi Leon,
kernel test robot noticed the following build warnings:
url: https://github.com/intel-lab-lkp/linux/commits/Leon-Hwang/bpf-Introduce-64-bit-bitops-kfuncs/20260219-223550
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/20260219142933.13904-2-leon.hwang%40linux.dev
patch subject: [PATCH bpf-next v2 1/6] bpf: Introduce 64-bit bitops kfuncs
config: i386-randconfig-141-20260220 (https://download.01.org/0day-ci/archive/20260221/202602210241.E7Q88vvq-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
smatch version: v0.5.0-8994-gd50c5a4c
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>
| Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
| Closes: https://lore.kernel.org/r/202602210241.E7Q88vvq-lkp@intel.com/
smatch warnings:
kernel/bpf/verifier.c:18245 bpf_kfunc_is_fastcall() error: buffer overflow 'special_kfunc_list' 64 <= 64
vim +/special_kfunc_list +18245 kernel/bpf/verifier.c
966e89879bbea4 Leon Hwang 2026-02-19 18223 static bool bpf_kfunc_is_fastcall(struct bpf_verifier_env *env, u32 func_id, u32 flags)
966e89879bbea4 Leon Hwang 2026-02-19 18224 {
966e89879bbea4 Leon Hwang 2026-02-19 18225 if (!(flags & KF_FASTCALL))
966e89879bbea4 Leon Hwang 2026-02-19 18226 return false;
966e89879bbea4 Leon Hwang 2026-02-19 18227
966e89879bbea4 Leon Hwang 2026-02-19 18228 if (!env->prog->jit_requested)
966e89879bbea4 Leon Hwang 2026-02-19 18229 return true;
966e89879bbea4 Leon Hwang 2026-02-19 18230
966e89879bbea4 Leon Hwang 2026-02-19 18231 if (func_id == special_kfunc_list[KF_bpf_clz64])
966e89879bbea4 Leon Hwang 2026-02-19 18232 return bpf_jit_inlines_kfunc_call(bpf_clz64);
966e89879bbea4 Leon Hwang 2026-02-19 18233 if (func_id == special_kfunc_list[KF_bpf_ctz64])
966e89879bbea4 Leon Hwang 2026-02-19 18234 return bpf_jit_inlines_kfunc_call(bpf_ctz64);
966e89879bbea4 Leon Hwang 2026-02-19 18235 if (func_id == special_kfunc_list[KF_bpf_ffs64])
966e89879bbea4 Leon Hwang 2026-02-19 18236 return bpf_jit_inlines_kfunc_call(bpf_ffs64);
966e89879bbea4 Leon Hwang 2026-02-19 18237 if (func_id == special_kfunc_list[KF_bpf_fls64])
966e89879bbea4 Leon Hwang 2026-02-19 18238 return bpf_jit_inlines_kfunc_call(bpf_fls64);
966e89879bbea4 Leon Hwang 2026-02-19 18239 if (func_id == special_kfunc_list[KF_bpf_bitrev64])
966e89879bbea4 Leon Hwang 2026-02-19 18240 return bpf_jit_inlines_kfunc_call(bpf_bitrev64);
966e89879bbea4 Leon Hwang 2026-02-19 18241 if (func_id == special_kfunc_list[KF_bpf_popcnt64])
966e89879bbea4 Leon Hwang 2026-02-19 18242 return bpf_jit_inlines_kfunc_call(bpf_popcnt64);
966e89879bbea4 Leon Hwang 2026-02-19 18243 if (func_id == special_kfunc_list[KF_bpf_rol64])
966e89879bbea4 Leon Hwang 2026-02-19 18244 return bpf_jit_inlines_kfunc_call(bpf_rol64);
966e89879bbea4 Leon Hwang 2026-02-19 @18245 if (func_id == special_kfunc_list[KF_bpf_ror64])
^^^^^^^^^^^^
special_kfunc_list[] has 64 elements and KF_bpf_ror64 is 64 so
this is out of bounds.
966e89879bbea4 Leon Hwang 2026-02-19 18246 return bpf_jit_inlines_kfunc_call(bpf_ror64);
966e89879bbea4 Leon Hwang 2026-02-19 18247
966e89879bbea4 Leon Hwang 2026-02-19 18248 return true;
966e89879bbea4 Leon Hwang 2026-02-19 18249 }
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
WARNING: multiple messages have this Message-ID (diff)
From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Dan Carpenter <error27@gmail.com>
Subject: Re: [PATCH bpf-next v2 1/6] bpf: Introduce 64-bit bitops kfuncs
Date: Sat, 21 Feb 2026 02:57:34 +0800 [thread overview]
Message-ID: <202602210241.E7Q88vvq-lkp@intel.com> (raw)
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
In-Reply-To: <20260219142933.13904-2-leon.hwang@linux.dev>
References: <20260219142933.13904-2-leon.hwang@linux.dev>
TO: Leon Hwang <leon.hwang@linux.dev>
TO: bpf@vger.kernel.org
CC: Alexei Starovoitov <ast@kernel.org>
CC: Daniel Borkmann <daniel@iogearbox.net>
CC: Andrii Nakryiko <andrii@kernel.org>
CC: Martin KaFai Lau <martin.lau@linux.dev>
CC: Eduard Zingerman <eddyz87@gmail.com>
CC: Song Liu <song@kernel.org>
CC: Yonghong Song <yonghong.song@linux.dev>
CC: John Fastabend <john.fastabend@gmail.com>
CC: KP Singh <kpsingh@kernel.org>
CC: Stanislav Fomichev <sdf@fomichev.me>
CC: Hao Luo <haoluo@google.com>
CC: Jiri Olsa <jolsa@kernel.org>
CC: Puranjay Mohan <puranjay@kernel.org>
CC: Xu Kuohai <xukuohai@huaweicloud.com>
CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Will Deacon <will@kernel.org>
CC: Thomas Gleixner <tglx@kernel.org>
CC: Ingo Molnar <mingo@redhat.com>
CC: Borislav Petkov <bp@alien8.de>
CC: Dave Hansen <dave.hansen@linux.intel.com>
CC: x86@kernel.org
CC: "H . Peter Anvin" <hpa@zytor.com>
CC: Shuah Khan <skhan@linuxfoundation.org>
CC: Leon Hwang <leon.hwang@linux.dev>
CC: Peilin Ye <yepeilin@google.com>
CC: Luis Gerhorst <luis.gerhorst@fau.de>
CC: Viktor Malik <vmalik@redhat.com>
CC: linux-arm-kernel@lists.infradead.org
CC: linux-kernel@vger.kernel.org
Hi Leon,
kernel test robot noticed the following build warnings:
[auto build test WARNING on bpf-next/master]
url: https://github.com/intel-lab-lkp/linux/commits/Leon-Hwang/bpf-Introduce-64-bit-bitops-kfuncs/20260219-223550
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/20260219142933.13904-2-leon.hwang%40linux.dev
patch subject: [PATCH bpf-next v2 1/6] bpf: Introduce 64-bit bitops kfuncs
:::::: branch date: 28 hours ago
:::::: commit date: 28 hours ago
config: i386-randconfig-141-20260220 (https://download.01.org/0day-ci/archive/20260221/202602210241.E7Q88vvq-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
smatch version: v0.5.0-8994-gd50c5a4c
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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202602210241.E7Q88vvq-lkp@intel.com/
smatch warnings:
kernel/bpf/verifier.c:18245 bpf_kfunc_is_fastcall() error: buffer overflow 'special_kfunc_list' 64 <= 64
vim +/special_kfunc_list +18245 kernel/bpf/verifier.c
5b5f51bff1b66c Eduard Zingerman 2024-07-22 18222
966e89879bbea4 Leon Hwang 2026-02-19 18223 static bool bpf_kfunc_is_fastcall(struct bpf_verifier_env *env, u32 func_id, u32 flags)
966e89879bbea4 Leon Hwang 2026-02-19 18224 {
966e89879bbea4 Leon Hwang 2026-02-19 18225 if (!(flags & KF_FASTCALL))
966e89879bbea4 Leon Hwang 2026-02-19 18226 return false;
966e89879bbea4 Leon Hwang 2026-02-19 18227
966e89879bbea4 Leon Hwang 2026-02-19 18228 if (!env->prog->jit_requested)
966e89879bbea4 Leon Hwang 2026-02-19 18229 return true;
966e89879bbea4 Leon Hwang 2026-02-19 18230
966e89879bbea4 Leon Hwang 2026-02-19 18231 if (func_id == special_kfunc_list[KF_bpf_clz64])
966e89879bbea4 Leon Hwang 2026-02-19 18232 return bpf_jit_inlines_kfunc_call(bpf_clz64);
966e89879bbea4 Leon Hwang 2026-02-19 18233 if (func_id == special_kfunc_list[KF_bpf_ctz64])
966e89879bbea4 Leon Hwang 2026-02-19 18234 return bpf_jit_inlines_kfunc_call(bpf_ctz64);
966e89879bbea4 Leon Hwang 2026-02-19 18235 if (func_id == special_kfunc_list[KF_bpf_ffs64])
966e89879bbea4 Leon Hwang 2026-02-19 18236 return bpf_jit_inlines_kfunc_call(bpf_ffs64);
966e89879bbea4 Leon Hwang 2026-02-19 18237 if (func_id == special_kfunc_list[KF_bpf_fls64])
966e89879bbea4 Leon Hwang 2026-02-19 18238 return bpf_jit_inlines_kfunc_call(bpf_fls64);
966e89879bbea4 Leon Hwang 2026-02-19 18239 if (func_id == special_kfunc_list[KF_bpf_bitrev64])
966e89879bbea4 Leon Hwang 2026-02-19 18240 return bpf_jit_inlines_kfunc_call(bpf_bitrev64);
966e89879bbea4 Leon Hwang 2026-02-19 18241 if (func_id == special_kfunc_list[KF_bpf_popcnt64])
966e89879bbea4 Leon Hwang 2026-02-19 18242 return bpf_jit_inlines_kfunc_call(bpf_popcnt64);
966e89879bbea4 Leon Hwang 2026-02-19 18243 if (func_id == special_kfunc_list[KF_bpf_rol64])
966e89879bbea4 Leon Hwang 2026-02-19 18244 return bpf_jit_inlines_kfunc_call(bpf_rol64);
966e89879bbea4 Leon Hwang 2026-02-19 @18245 if (func_id == special_kfunc_list[KF_bpf_ror64])
966e89879bbea4 Leon Hwang 2026-02-19 18246 return bpf_jit_inlines_kfunc_call(bpf_ror64);
966e89879bbea4 Leon Hwang 2026-02-19 18247
966e89879bbea4 Leon Hwang 2026-02-19 18248 return true;
966e89879bbea4 Leon Hwang 2026-02-19 18249 }
966e89879bbea4 Leon Hwang 2026-02-19 18250
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next parent reply other threads:[~2026-02-21 9:58 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-20 18:57 kernel test robot [this message]
2026-02-21 9:58 ` [PATCH bpf-next v2 1/6] bpf: Introduce 64-bit bitops kfuncs Dan Carpenter
2026-02-21 12:50 ` Leon Hwang
-- strict thread matches above, loose matches on Subject: below --
2026-02-19 14:29 [PATCH bpf-next v2 0/6] " Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 1/6] " Leon Hwang
2026-02-19 17:50 ` Alexei Starovoitov
2026-02-20 15:34 ` Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 2/6] bpf, x86: Add 64-bit bitops kfuncs support for x86_64 Leon Hwang
2026-02-19 17:47 ` Alexei Starovoitov
2026-02-20 15:54 ` Leon Hwang
2026-02-20 17:50 ` Alexei Starovoitov
2026-02-21 12:45 ` Leon Hwang
2026-02-21 16:51 ` Alexei Starovoitov
2026-02-23 16:35 ` Leon Hwang
2026-02-19 22:05 ` kernel test robot
2026-02-20 14:12 ` Leon Hwang
2026-02-20 11:59 ` kernel test robot
2026-02-19 14:29 ` [PATCH bpf-next v2 3/6] bpf, arm64: Add 64-bit bitops kfuncs support Leon Hwang
2026-02-19 15:10 ` Puranjay Mohan
2026-02-19 15:20 ` Puranjay Mohan
2026-02-19 15:25 ` Puranjay Mohan
2026-02-19 15:36 ` Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 4/6] selftests/bpf: Add tests for 64-bit bitops kfuncs Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 5/6] selftests/bpf: Add __cpu_feature annotation for CPU-feature-gated tests Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 6/6] selftests/bpf: Add JIT disassembly tests for 64-bit bitops kfuncs Leon Hwang
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