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Date: Sun, 5 Sep 2021 14:40:20 -0700 From: Kees Cook <keescook@...omium.org> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, Daniel Vetter <daniel@...ll.ch>, Dan Williams <dan.j.williams@...el.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, Keith Packard <keithp@...thp.com>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, linux-hardening@...r.kernel.org Subject: [GIT PULL][take 2] overflow updates for v5.15-rc1 Hi Linus, Please pull these (now LANG-fixed) overflow updates for v5.15-rc1. Thanks! -Kees The following changes since commit 2734d6c1b1a089fb593ef6a23d4b70903526fe0c: Linux 5.14-rc2 (2021-07-18 14:13:49 -0700) are available in the Git repository at: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git tags/overflow-v5.15-rc1 for you to fetch changes up to 7d81191ddf3a456eb6644fd63a9b282e040ad49b: treewide: Replace 0-element memcpy() destinations with flexible arrays (2021-09-05 14:03:25 -0700) ---------------------------------------------------------------- overflow updates for v5.15-rc1 (take 2) The end goal of the current buffer overflow detection work[0] is to gain full compile-time and run-time coverage of all detectable buffer overflows seen via array indexing or memcpy(), memmove(), and memset(). The str*() family of functions already have full coverage. While much of the work for these changes have been on-going for many releases (i.e. 0-element and 1-element array replacements, as well as avoiding false positives and fixing discovered overflows[1]), this series contains the foundational elements of several related buffer overflow detection improvements by providing new common helpers and FORTIFY_SOURCE changes needed to gain the introspection needed for compiler visibility into array sizes. Also included are a handful of already Acked instances using the helpers (or related clean-ups), with many more waiting at the ready to be taken via subsystem-specific trees[2]. The new helpers are: - struct_group() for gaining struct member range introspection. - memset_after() and memset_startat() for clearing to the end of structures. - DECLARE_FLEX_ARRAY() for using flex arrays in unions or alone in structs. Also included is the beginning of the refactoring of FORTIFY_SOURCE to support memcpy() introspection, fix missing and regressed coverage under GCC, and to prepare to fix the currently broken Clang support. Finishing this work is part of the larger series[0], but depends on all the false positives and buffer overflow bug fixes to have landed already and those that depend on this series to land. As part of the FORTIFY_SOURCE refactoring, a set of both a compile-time and run-time tests are added for FORTIFY_SOURCE and the mem*()-family functions respectively. (Now with the LANG=C grep mismatch[5] fixed from PR take 1). Please note that the appearance of "panic" and "BUG" in the FORTIFY_SOURCE refactoring are the result of relocating existing code, and no new use of those code-paths are expected nor desired. Finally, there are two tree-wide conversions for 0-element arrays and flexible array unions to gain sane compiler introspection coverage that result in no known object code differences. After this series (and the changes that have now landed via netdev and usb), we are so very close to finally being able to build with -Warray-bounds and -Wzero-length-bounds. However, due two recently found corner cases in GCC[3] and Clang[4], I have not included the last two patches that turn on these options, as I don't want to introduce any known warnings to the build. I am expecting to solve them before rc2, though, so hopefully there will be a small follow-up to this series before then. [0] https://lore.kernel.org/lkml/20210818060533.3569517-1-keescook@chromium.org/ [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=FORTIFY_SOURCE [2] https://lore.kernel.org/lkml/202108220107.3E26FE6C9C@keescook/ [3] https://lore.kernel.org/lkml/3ab153ec-2798-da4c-f7b1-81b0ac8b0c5b@roeck-us.net/ [4] https://bugs.llvm.org/show_bug.cgi?id=51682 [5] https://lore.kernel.org/lkml/202109051257.29B29745C0@keescook/ ---------------------------------------------------------------- Kees Cook (28): scsi: ibmvscsi: Avoid multi-field memset() overflow by aiming at srp powerpc: Split memset() to avoid multi-field overflow stddef: Fix kerndoc for sizeof_field() and offsetofend() stddef: Introduce struct_group() helper macro cxl/core: Replace unions with struct_group() bnxt_en: Use struct_group_attr() for memcpy() region iommu/amd: Use struct_group() for memcpy() region drm/mga/mga_ioc32: Use struct_group() for memcpy() region HID: cp2112: Use struct_group() for memcpy() region HID: roccat: Use struct_group() to zero kone_mouse_event can: flexcan: Use struct_group() to zero struct flexcan_regs regions cm4000_cs: Use struct_group() to zero struct cm4000_dev region compiler_types.h: Remove __compiletime_object_size() lib/string: Move helper functions out of string.c fortify: Move remaining fortify helpers into fortify-string.h fortify: Explicitly disable Clang support fortify: Fix dropped strcpy() compile-time write overflow check fortify: Prepare to improve strnlen() and strlen() warnings fortify: Allow strlen() and strnlen() to pass compile-time known lengths fortify: Add compile-time FORTIFY_SOURCE tests lib: Introduce CONFIG_MEMCPY_KUNIT_TEST string.h: Introduce memset_after() for wiping trailing members/padding xfrm: Use memset_after() to clear padding string.h: Introduce memset_startat() for wiping trailing members and padding btrfs: Use memset_startat() to clear end of struct stddef: Introduce DECLARE_FLEX_ARRAY() helper treewide: Replace open-coded flex arrays in unions treewide: Replace 0-element memcpy() destinations with flexible arrays MAINTAINERS | 9 + arch/arm/boot/compressed/string.c | 1 + arch/s390/lib/string.c | 3 + arch/x86/boot/compressed/misc.h | 2 + arch/x86/boot/compressed/pgtable_64.c | 2 + arch/x86/lib/string_32.c | 1 + drivers/char/pcmcia/cm4000_cs.c | 9 +- drivers/crypto/chelsio/chcr_crypto.h | 14 +- drivers/cxl/cxl.h | 61 ++--- drivers/gpu/drm/mga/mga_ioc32.c | 27 +- drivers/hid/hid-cp2112.c | 14 +- drivers/hid/hid-roccat-kone.c | 2 +- drivers/hid/hid-roccat-kone.h | 12 +- drivers/iommu/amd/init.c | 9 +- drivers/macintosh/smu.c | 3 +- drivers/net/can/flexcan.c | 68 ++--- drivers/net/can/usb/etas_es58x/es581_4.h | 2 +- drivers/net/can/usb/etas_es58x/es58x_fd.h | 2 +- drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c | 4 +- drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h | 14 +- drivers/net/wireless/ath/ath10k/bmi.h | 10 +- drivers/net/wireless/ath/ath10k/htt.h | 7 +- drivers/net/wireless/intel/iwlegacy/commands.h | 6 +- drivers/net/wireless/intel/iwlwifi/dvm/commands.h | 6 +- drivers/net/wireless/intel/iwlwifi/fw/api/tx.h | 12 +- drivers/scsi/aic94xx/aic94xx_sds.c | 6 +- drivers/scsi/ibmvscsi/ibmvscsi.c | 3 +- drivers/scsi/qla4xxx/ql4_def.h | 4 +- drivers/staging/rtl8188eu/include/ieee80211.h | 6 +- drivers/staging/rtl8712/ieee80211.h | 4 +- drivers/staging/rtl8723bs/include/ieee80211.h | 6 +- fs/btrfs/root-tree.c | 6 +- fs/hpfs/hpfs.h | 8 +- include/linux/compiler-gcc.h | 2 - include/linux/compiler_types.h | 4 - include/linux/filter.h | 6 +- include/linux/fortify-string.h | 77 ++++-- include/linux/ieee80211.h | 30 +-- include/linux/stddef.h | 65 ++++- include/linux/string.h | 44 +++- include/linux/thread_info.h | 2 +- include/scsi/sas.h | 12 +- include/uapi/drm/mga_drm.h | 22 +- include/uapi/linux/dlm_device.h | 4 +- include/uapi/linux/stddef.h | 37 +++ include/uapi/rdma/rdma_user_rxe.h | 4 +- include/uapi/sound/asoc.h | 4 +- lib/.gitignore | 2 + lib/Kconfig.debug | 11 + lib/Makefile | 34 +++ lib/memcpy_kunit.c | 289 ++++++++++++++++++++++ lib/string.c | 210 +--------------- lib/string_helpers.c | 195 +++++++++++++++ lib/test_fortify/read_overflow-memchr.c | 5 + lib/test_fortify/read_overflow-memchr_inv.c | 5 + lib/test_fortify/read_overflow-memcmp.c | 5 + lib/test_fortify/read_overflow-memscan.c | 5 + lib/test_fortify/read_overflow2-memcmp.c | 5 + lib/test_fortify/read_overflow2-memcpy.c | 5 + lib/test_fortify/read_overflow2-memmove.c | 5 + lib/test_fortify/test_fortify.h | 35 +++ lib/test_fortify/write_overflow-memcpy.c | 5 + lib/test_fortify/write_overflow-memmove.c | 5 + lib/test_fortify/write_overflow-memset.c | 5 + lib/test_fortify/write_overflow-strcpy-lit.c | 5 + lib/test_fortify/write_overflow-strcpy.c | 5 + lib/test_fortify/write_overflow-strlcpy-src.c | 5 + lib/test_fortify/write_overflow-strlcpy.c | 5 + lib/test_fortify/write_overflow-strncpy-src.c | 5 + lib/test_fortify/write_overflow-strncpy.c | 5 + lib/test_fortify/write_overflow-strscpy.c | 5 + net/xfrm/xfrm_policy.c | 4 +- net/xfrm/xfrm_user.c | 2 +- scripts/kernel-doc | 9 + scripts/test_fortify.sh | 63 +++++ security/Kconfig | 3 + 76 files changed, 1153 insertions(+), 445 deletions(-) create mode 100644 lib/memcpy_kunit.c create mode 100644 lib/test_fortify/read_overflow-memchr.c create mode 100644 lib/test_fortify/read_overflow-memchr_inv.c create mode 100644 lib/test_fortify/read_overflow-memcmp.c create mode 100644 lib/test_fortify/read_overflow-memscan.c create mode 100644 lib/test_fortify/read_overflow2-memcmp.c create mode 100644 lib/test_fortify/read_overflow2-memcpy.c create mode 100644 lib/test_fortify/read_overflow2-memmove.c create mode 100644 lib/test_fortify/test_fortify.h create mode 100644 lib/test_fortify/write_overflow-memcpy.c create mode 100644 lib/test_fortify/write_overflow-memmove.c create mode 100644 lib/test_fortify/write_overflow-memset.c create mode 100644 lib/test_fortify/write_overflow-strcpy-lit.c create mode 100644 lib/test_fortify/write_overflow-strcpy.c create mode 100644 lib/test_fortify/write_overflow-strlcpy-src.c create mode 100644 lib/test_fortify/write_overflow-strlcpy.c create mode 100644 lib/test_fortify/write_overflow-strncpy-src.c create mode 100644 lib/test_fortify/write_overflow-strncpy.c create mode 100644 lib/test_fortify/write_overflow-strscpy.c create mode 100644 scripts/test_fortify.sh -- Kees Cook
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