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Peter Anvin" , Shuah Khan , Leon Hwang , Peilin Ye , Luis Gerhorst , Viktor Malik , 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 Message-ID: <202602210241.E7Q88vvq-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 | Reported-by: Dan Carpenter | 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