tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 53ab6975c12d1ad86c599a8927e8c698b144d669 commit: a0fd5a5f676c78e0cc9218c2d80c9211a41e8550 [5458/8413] drm/amd/amdgpu: introduce DRM_AMDGPU_WERROR config: powerpc-randconfig-r034-20230612 (https://download.01.org/0day-ci/archive/20230612/202306121127.dP9U2Nnl-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce (this is a W=1 build): mkdir -p ~/bin wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a0fd5a5f676c78e0cc9218c2d80c9211a41e8550 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout a0fd5a5f676c78e0cc9218c2d80c9211a41e8550 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash 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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202306121127.dP9U2Nnl-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): In file included from drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/sienna_cichlid_ppt.c:26: In file included from include/linux/firmware.h:7: In file included from include/linux/gfp.h:7: In file included from include/linux/mmzone.h:8: In file included from include/linux/spinlock.h:63: In file included from include/linux/lockdep.h:14: In file included from include/linux/smp.h:13: In file included from include/linux/cpumask.h:12: In file included from include/linux/bitmap.h:11: In file included from include/linux/string.h:254: >> include/linux/fortify-string.h:529:4: error: call to '__read_overflow2_field' declared with 'warning' attribute: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Werror,-Wattribute-warning] 529 | __read_overflow2_field(q_size_field, size); | ^ 1 error generated. vim +529 include/linux/fortify-string.h a28a6e860c6cf2 Francis Laniel 2021-02-25 464 f68f2ff91512c1 Kees Cook 2021-04-20 465 /* f68f2ff91512c1 Kees Cook 2021-04-20 466 * To make sure the compiler can enforce protection against buffer overflows, f68f2ff91512c1 Kees Cook 2021-04-20 467 * memcpy(), memmove(), and memset() must not be used beyond individual f68f2ff91512c1 Kees Cook 2021-04-20 468 * struct members. If you need to copy across multiple members, please use f68f2ff91512c1 Kees Cook 2021-04-20 469 * struct_group() to create a named mirror of an anonymous struct union. f68f2ff91512c1 Kees Cook 2021-04-20 470 * (e.g. see struct sk_buff.) Read overflow checking is currently only f68f2ff91512c1 Kees Cook 2021-04-20 471 * done when a write overflow is also present, or when building with W=1. f68f2ff91512c1 Kees Cook 2021-04-20 472 * f68f2ff91512c1 Kees Cook 2021-04-20 473 * Mitigation coverage matrix f68f2ff91512c1 Kees Cook 2021-04-20 474 * Bounds checking at: f68f2ff91512c1 Kees Cook 2021-04-20 475 * +-------+-------+-------+-------+ f68f2ff91512c1 Kees Cook 2021-04-20 476 * | Compile time | Run time | f68f2ff91512c1 Kees Cook 2021-04-20 477 * memcpy() argument sizes: | write | read | write | read | f68f2ff91512c1 Kees Cook 2021-04-20 478 * dest source length +-------+-------+-------+-------+ f68f2ff91512c1 Kees Cook 2021-04-20 479 * memcpy(known, known, constant) | y | y | n/a | n/a | f68f2ff91512c1 Kees Cook 2021-04-20 480 * memcpy(known, unknown, constant) | y | n | n/a | V | f68f2ff91512c1 Kees Cook 2021-04-20 481 * memcpy(known, known, dynamic) | n | n | B | B | f68f2ff91512c1 Kees Cook 2021-04-20 482 * memcpy(known, unknown, dynamic) | n | n | B | V | f68f2ff91512c1 Kees Cook 2021-04-20 483 * memcpy(unknown, known, constant) | n | y | V | n/a | f68f2ff91512c1 Kees Cook 2021-04-20 484 * memcpy(unknown, unknown, constant) | n | n | V | V | f68f2ff91512c1 Kees Cook 2021-04-20 485 * memcpy(unknown, known, dynamic) | n | n | V | B | f68f2ff91512c1 Kees Cook 2021-04-20 486 * memcpy(unknown, unknown, dynamic) | n | n | V | V | f68f2ff91512c1 Kees Cook 2021-04-20 487 * +-------+-------+-------+-------+ f68f2ff91512c1 Kees Cook 2021-04-20 488 * f68f2ff91512c1 Kees Cook 2021-04-20 489 * y = perform deterministic compile-time bounds checking f68f2ff91512c1 Kees Cook 2021-04-20 490 * n = cannot perform deterministic compile-time bounds checking f68f2ff91512c1 Kees Cook 2021-04-20 491 * n/a = no run-time bounds checking needed since compile-time deterministic f68f2ff91512c1 Kees Cook 2021-04-20 492 * B = can perform run-time bounds checking (currently unimplemented) f68f2ff91512c1 Kees Cook 2021-04-20 493 * V = vulnerable to run-time overflow (will need refactoring to solve) f68f2ff91512c1 Kees Cook 2021-04-20 494 * f68f2ff91512c1 Kees Cook 2021-04-20 495 */ 54d9469bc515dc Kees Cook 2021-06-24 496 __FORTIFY_INLINE bool fortify_memcpy_chk(__kernel_size_t size, f68f2ff91512c1 Kees Cook 2021-04-20 497 const size_t p_size, f68f2ff91512c1 Kees Cook 2021-04-20 498 const size_t q_size, f68f2ff91512c1 Kees Cook 2021-04-20 499 const size_t p_size_field, f68f2ff91512c1 Kees Cook 2021-04-20 500 const size_t q_size_field, f68f2ff91512c1 Kees Cook 2021-04-20 501 const char *func) a28a6e860c6cf2 Francis Laniel 2021-02-25 502 { a28a6e860c6cf2 Francis Laniel 2021-02-25 503 if (__builtin_constant_p(size)) { f68f2ff91512c1 Kees Cook 2021-04-20 504 /* f68f2ff91512c1 Kees Cook 2021-04-20 505 * Length argument is a constant expression, so we f68f2ff91512c1 Kees Cook 2021-04-20 506 * can perform compile-time bounds checking where fa35198f39571b Kees Cook 2022-09-19 507 * buffer sizes are also known at compile time. f68f2ff91512c1 Kees Cook 2021-04-20 508 */ f68f2ff91512c1 Kees Cook 2021-04-20 509 f68f2ff91512c1 Kees Cook 2021-04-20 510 /* Error when size is larger than enclosing struct. */ fa35198f39571b Kees Cook 2022-09-19 511 if (__compiletime_lessthan(p_size_field, p_size) && fa35198f39571b Kees Cook 2022-09-19 512 __compiletime_lessthan(p_size, size)) a28a6e860c6cf2 Francis Laniel 2021-02-25 513 __write_overflow(); fa35198f39571b Kees Cook 2022-09-19 514 if (__compiletime_lessthan(q_size_field, q_size) && fa35198f39571b Kees Cook 2022-09-19 515 __compiletime_lessthan(q_size, size)) a28a6e860c6cf2 Francis Laniel 2021-02-25 516 __read_overflow2(); f68f2ff91512c1 Kees Cook 2021-04-20 517 f68f2ff91512c1 Kees Cook 2021-04-20 518 /* Warn when write size argument larger than dest field. */ fa35198f39571b Kees Cook 2022-09-19 519 if (__compiletime_lessthan(p_size_field, size)) f68f2ff91512c1 Kees Cook 2021-04-20 520 __write_overflow_field(p_size_field, size); f68f2ff91512c1 Kees Cook 2021-04-20 521 /* f68f2ff91512c1 Kees Cook 2021-04-20 522 * Warn for source field over-read when building with W=1 f68f2ff91512c1 Kees Cook 2021-04-20 523 * or when an over-write happened, so both can be fixed at f68f2ff91512c1 Kees Cook 2021-04-20 524 * the same time. f68f2ff91512c1 Kees Cook 2021-04-20 525 */ fa35198f39571b Kees Cook 2022-09-19 526 if ((IS_ENABLED(KBUILD_EXTRA_WARN1) || fa35198f39571b Kees Cook 2022-09-19 527 __compiletime_lessthan(p_size_field, size)) && fa35198f39571b Kees Cook 2022-09-19 528 __compiletime_lessthan(q_size_field, size)) f68f2ff91512c1 Kees Cook 2021-04-20 @529 __read_overflow2_field(q_size_field, size); a28a6e860c6cf2 Francis Laniel 2021-02-25 530 } f68f2ff91512c1 Kees Cook 2021-04-20 531 /* f68f2ff91512c1 Kees Cook 2021-04-20 532 * At this point, length argument may not be a constant expression, f68f2ff91512c1 Kees Cook 2021-04-20 533 * so run-time bounds checking can be done where buffer sizes are f68f2ff91512c1 Kees Cook 2021-04-20 534 * known. (This is not an "else" because the above checks may only f68f2ff91512c1 Kees Cook 2021-04-20 535 * be compile-time warnings, and we want to still warn for run-time f68f2ff91512c1 Kees Cook 2021-04-20 536 * overflows.) f68f2ff91512c1 Kees Cook 2021-04-20 537 */ f68f2ff91512c1 Kees Cook 2021-04-20 538 f68f2ff91512c1 Kees Cook 2021-04-20 539 /* f68f2ff91512c1 Kees Cook 2021-04-20 540 * Always stop accesses beyond the struct that contains the f68f2ff91512c1 Kees Cook 2021-04-20 541 * field, when the buffer's remaining size is known. 311fb40aa0569a Kees Cook 2022-09-02 542 * (The SIZE_MAX test is to optimize away checks where the buffer f68f2ff91512c1 Kees Cook 2021-04-20 543 * lengths are unknown.) f68f2ff91512c1 Kees Cook 2021-04-20 544 */ 311fb40aa0569a Kees Cook 2022-09-02 545 if ((p_size != SIZE_MAX && p_size < size) || 311fb40aa0569a Kees Cook 2022-09-02 546 (q_size != SIZE_MAX && q_size < size)) f68f2ff91512c1 Kees Cook 2021-04-20 547 fortify_panic(func); 54d9469bc515dc Kees Cook 2021-06-24 548 54d9469bc515dc Kees Cook 2021-06-24 549 /* 54d9469bc515dc Kees Cook 2021-06-24 550 * Warn when writing beyond destination field size. 54d9469bc515dc Kees Cook 2021-06-24 551 * 54d9469bc515dc Kees Cook 2021-06-24 552 * We must ignore p_size_field == 0 for existing 0-element 54d9469bc515dc Kees Cook 2021-06-24 553 * fake flexible arrays, until they are all converted to 54d9469bc515dc Kees Cook 2021-06-24 554 * proper flexible arrays. 54d9469bc515dc Kees Cook 2021-06-24 555 * 9f7d69c5cd2390 Kees Cook 2022-09-19 556 * The implementation of __builtin_*object_size() behaves 54d9469bc515dc Kees Cook 2021-06-24 557 * like sizeof() when not directly referencing a flexible 54d9469bc515dc Kees Cook 2021-06-24 558 * array member, which means there will be many bounds checks 54d9469bc515dc Kees Cook 2021-06-24 559 * that will appear at run-time, without a way for them to be 54d9469bc515dc Kees Cook 2021-06-24 560 * detected at compile-time (as can be done when the destination 54d9469bc515dc Kees Cook 2021-06-24 561 * is specifically the flexible array member). 54d9469bc515dc Kees Cook 2021-06-24 562 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101832 54d9469bc515dc Kees Cook 2021-06-24 563 */ 54d9469bc515dc Kees Cook 2021-06-24 564 if (p_size_field != 0 && p_size_field != SIZE_MAX && 54d9469bc515dc Kees Cook 2021-06-24 565 p_size != p_size_field && p_size_field < size) 54d9469bc515dc Kees Cook 2021-06-24 566 return true; 54d9469bc515dc Kees Cook 2021-06-24 567 54d9469bc515dc Kees Cook 2021-06-24 568 return false; a28a6e860c6cf2 Francis Laniel 2021-02-25 569 } a28a6e860c6cf2 Francis Laniel 2021-02-25 570 :::::: The code at line 529 was first introduced by commit :::::: f68f2ff91512c199ec24883001245912afc17873 fortify: Detect struct member overflows in memcpy() at compile-time :::::: TO: Kees Cook <keescook@xxxxxxxxxxxx> :::::: CC: Kees Cook <keescook@xxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
