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check-uapi.sh
#!/bin/bash # SPDX-License-Identifier: GPL-2.0-only # Script to check commits for UAPI backwards compatibility set -o errexit set -o pipefail print_usage() { name=$(basename "$0") cat << EOF $name - check for UAPI header stability across Git commits By default, the script will check to make sure the latest commit (or current dirty changes) did not introduce ABI changes when compared to HEAD^1. You can check against additional commit ranges with the -b and -p options. The script will not check UAPI headers for architectures other than the one defined in ARCH. Usage: $name [-b BASE_REF] [-p PAST_REF] [-j N] [-l ERROR_LOG] [-i] [-q] [-v] Options: -b BASE_REF Base git reference to use for comparison. If unspecified or empty, will use any dirty changes in tree to UAPI files. If there are no dirty changes, HEAD will be used. -p PAST_REF Compare BASE_REF to PAST_REF (e.g. -p v6.1). If unspecified or empty, will use BASE_REF^1. Must be an ancestor of BASE_REF. Only headers that exist on PAST_REF will be checked for compatibility. -j JOBS Number of checks to run in parallel (default: number of CPU cores). -l ERROR_LOG Write error log to file (default: no error log is generated). -i Ignore ambiguous changes that may or may not break UAPI compatibility. -q Quiet operation. -v Verbose operation (print more information about each header being checked). Environmental args: ABIDIFF Custom path to abidiff binary CC C compiler (default is "gcc") ARCH Target architecture for the UAPI check (default is host arch) Exit codes: $SUCCESS) Success $FAIL_ABI) ABI difference detected $FAIL_PREREQ) Prerequisite not met EOF } readonly SUCCESS=0 readonly FAIL_ABI=1 readonly FAIL_PREREQ=2 # Print to stderr eprintf() { # shellcheck disable=SC2059 printf "$@" >&2 } # Expand an array with a specific character (similar to Python string.join()) join() { local IFS="$1" shift printf "%s" "$*" } # Create abidiff suppressions gen_suppressions() { # Common enum variant names which we don't want to worry about # being shifted when new variants are added. local -a enum_regex=( ".*_AFTER_LAST$" ".*_CNT$" ".*_COUNT$" ".*_END$" ".*_LAST$" ".*_MASK$" ".*_MAX$" ".*_MAX_BIT$" ".*_MAX_BPF_ATTACH_TYPE$" ".*_MAX_ID$" ".*_MAX_SHIFT$" ".*_NBITS$" ".*_NETDEV_NUMHOOKS$" ".*_NFT_META_IIFTYPE$" ".*_NL80211_ATTR$" ".*_NLDEV_NUM_OPS$" ".*_NUM$" ".*_NUM_ELEMS$" ".*_NUM_IRQS$" ".*_SIZE$" ".*_TLSMAX$" "^MAX_.*" "^NUM_.*" ) # Common padding field names which can be expanded into # without worrying about users. local -a padding_regex=( ".*end$" ".*pad$" ".*pad[0-9]?$" ".*pad_[0-9]?$" ".*padding$" ".*padding[0-9]?$" ".*padding_[0-9]?$" ".*res$" ".*resv$" ".*resv[0-9]?$" ".*resv_[0-9]?$" ".*reserved$" ".*reserved[0-9]?$" ".*reserved_[0-9]?$" ".*rsvd[0-9]?$" ".*unused$" ) cat << EOF [suppress_type] type_kind = enum changed_enumerators_regexp = $(join , "${enum_regex[@]}") EOF for p in "${padding_regex[@]}"; do cat << EOF [suppress_type] type_kind = struct has_data_member_inserted_at = offset_of_first_data_member_regexp(${p}) EOF done if [ "$IGNORE_AMBIGUOUS_CHANGES" = "true" ]; then cat << EOF [suppress_type] type_kind = struct has_data_member_inserted_at = end has_size_change = yes EOF fi } # Check if git tree is dirty tree_is_dirty() { ! git diff --quiet } # Get list of files installed in $ref get_file_list() { local -r ref="$1" local -r tree="$(get_header_tree "$ref")" # Print all installed headers, filtering out ones that can't be compiled find "$tree" -type f -name '*.h' -printf '%P\n' | grep -v -f "$INCOMPAT_LIST" } # Add to the list of incompatible headers add_to_incompat_list() { local -r ref="$1" # Start with the usr/include/Makefile to get a list of the headers # that don't compile using this method. if [ ! -f usr/include/Makefile ]; then eprintf "error - no usr/include/Makefile present at %s\n" "$ref" eprintf "Note: usr/include/Makefile was added in the v5.3 kernel release\n" exit "$FAIL_PREREQ" fi { # shellcheck disable=SC2016 printf 'all: ; @echo $(no-header-test)\n' cat usr/include/Makefile } | SRCARCH="$ARCH" make --always-make -f - | tr " " "\n" \ | grep -v "asm-generic" >> "$INCOMPAT_LIST" # The makefile also skips all asm-generic files, but prints "asm-generic/%" # which won't work for our grep match. Instead, print something grep will match. printf "asm-generic/.*\.h\n" >> "$INCOMPAT_LIST" } # Compile the simple test app do_compile() { local -r inc_dir="$1" local -r header="$2" local -r out="$3" printf "int main(void) { return 0; }\n" | \ "$CC" -c \ -o "$out" \ -x c \ -O0 \ -std=c90 \ -fno-eliminate-unused-debug-types \ -g \ "-I${inc_dir}" \ -include "$header" \ - } # Run make headers_install run_make_headers_install() { local -r ref="$1" local -r install_dir="$(get_header_tree "$ref")" make -j "$MAX_THREADS" ARCH="$ARCH" INSTALL_HDR_PATH="$install_dir" \ headers_install > /dev/null } # Install headers for both git refs install_headers() { local -r base_ref="$1" local -r past_ref="$2" for ref in "$base_ref" "$past_ref"; do printf "Installing user-facing UAPI headers from %s... " "${ref:-dirty tree}" if [ -n "$ref" ]; then git archive --format=tar --prefix="${ref}-archive/" "$ref" \ | (cd "$TMP_DIR" && tar xf -) ( cd "${TMP_DIR}/${ref}-archive" run_make_headers_install "$ref" add_to_incompat_list "$ref" "$INCOMPAT_LIST" ) else run_make_headers_install "$ref" add_to_incompat_list "$ref" "$INCOMPAT_LIST" fi printf "OK\n" done sort -u -o "$INCOMPAT_LIST" "$INCOMPAT_LIST" sed -i -e '/^$/d' "$INCOMPAT_LIST" } # Print the path to the headers_install tree for a given ref get_header_tree() { local -r ref="$1" printf "%s" "${TMP_DIR}/${ref}/usr" } # Check file list for UAPI compatibility check_uapi_files() { local -r base_ref="$1" local -r past_ref="$2" local -r abi_error_log="$3" local passed=0; local failed=0; local -a threads=() set -o errexit printf "Checking changes to UAPI headers between %s and %s...\n" "$past_ref" "${base_ref:-dirty tree}" # Loop over all UAPI headers that were installed by $past_ref (if they only exist on $base_ref, # there's no way they're broken and no way to compare anyway) while read -r file; do if [ "${#threads[@]}" -ge "$MAX_THREADS" ]; then if wait "${threads[0]}"; then passed=$((passed + 1)) else failed=$((failed + 1)) fi threads=("${threads[@]:1}") fi check_individual_file "$base_ref" "$past_ref" "$file" & threads+=("$!") done < <(get_file_list "$past_ref") for t in "${threads[@]}"; do if wait "$t"; then passed=$((passed + 1)) else failed=$((failed + 1)) fi done if [ -n "$abi_error_log" ]; then printf 'Generated by "%s %s" from git ref %s\n\n' \ "$0" "$*" "$(git rev-parse HEAD)" > "$abi_error_log" fi while read -r error_file; do { cat "$error_file" printf "\n\n" } | tee -a "${abi_error_log:-/dev/null}" >&2 done < <(find "$TMP_DIR" -type f -name '*.error' | sort) total="$((passed + failed))" if [ "$failed" -gt 0 ]; then eprintf "error - %d/%d UAPI headers compatible with %s appear _not_ to be backwards compatible\n" \ "$failed" "$total" "$ARCH" if [ -n "$abi_error_log" ]; then eprintf "Failure summary saved to %s\n" "$abi_error_log" fi else printf "All %d UAPI headers compatible with %s appear to be backwards compatible\n" \ "$total" "$ARCH" fi return "$failed" } # Check an individual file for UAPI compatibility check_individual_file() { local -r base_ref="$1" local -r past_ref="$2" local -r file="$3" local -r base_header="$(get_header_tree "$base_ref")/${file}" local -r past_header="$(get_header_tree "$past_ref")/${file}" if [ ! -f "$base_header" ]; then mkdir -p "$(dirname "$base_header")" printf "==== UAPI header %s was removed between %s and %s ====" \ "$file" "$past_ref" "$base_ref" \ > "${base_header}.error" return 1 fi compare_abi "$file" "$base_header" "$past_header" "$base_ref" "$past_ref" } # Perform the A/B compilation and compare output ABI compare_abi() { local -r file="$1" local -r base_header="$2" local -r past_header="$3" local -r base_ref="$4" local -r past_ref="$5" local -r log="${TMP_DIR}/log/${file}.log" local -r error_log="${TMP_DIR}/log/${file}.error" mkdir -p "$(dirname "$log")" if ! do_compile "$(get_header_tree "$base_ref")/include" "$base_header" "${base_header}.bin" 2> "$log"; then { warn_str=$(printf "==== Could not compile version of UAPI header %s at %s ====\n" \ "$file" "$base_ref") printf "%s\n" "$warn_str" cat "$log" printf -- "=%.0s" $(seq 0 ${#warn_str}) } > "$error_log" return 1 fi if ! do_compile "$(get_header_tree "$past_ref")/include" "$past_header" "${past_header}.bin" 2> "$log"; then { warn_str=$(printf "==== Could not compile version of UAPI header %s at %s ====\n" \ "$file" "$past_ref") printf "%s\n" "$warn_str" cat "$log" printf -- "=%.0s" $(seq 0 ${#warn_str}) } > "$error_log" return 1 fi local ret=0 "$ABIDIFF" --non-reachable-types \ --suppressions "$SUPPRESSIONS" \ "${past_header}.bin" "${base_header}.bin" > "$log" || ret="$?" if [ "$ret" -eq 0 ]; then if [ "$VERBOSE" = "true" ]; then printf "No ABI differences detected in %s from %s -> %s\n" \ "$file" "$past_ref" "$base_ref" fi else # Bits in abidiff's return code can be used to determine the type of error if [ $((ret & 0x2)) -gt 0 ]; then eprintf "error - abidiff did not run properly\n" exit 1 fi if [ "$IGNORE_AMBIGUOUS_CHANGES" = "true" ] && [ "$ret" -eq 4 ]; then return 0 fi # If the only changes were additions (not modifications to existing APIs), then # there's no problem. Ignore these diffs. if grep "Unreachable types summary" "$log" | grep -q "0 removed" && grep "Unreachable types summary" "$log" | grep -q "0 changed"; then return 0 fi { warn_str=$(printf "==== ABI differences detected in %s from %s -> %s ====" \ "$file" "$past_ref" "$base_ref") printf "%s\n" "$warn_str" sed -e '/summary:/d' -e '/changed type/d' -e '/^$/d' -e 's/^/ /g' "$log" printf -- "=%.0s" $(seq 0 ${#warn_str}) if cmp "$past_header" "$base_header" > /dev/null 2>&1; then printf "\n%s did not change between %s and %s...\n" "$file" "$past_ref" "${base_ref:-dirty tree}" printf "It's possible a change to one of the headers it includes caused this error:\n" grep '^#include' "$base_header" printf "\n" fi } > "$error_log" return 1 fi } # Check that a minimum software version number is satisfied min_version_is_satisfied() { local -r min_version="$1" local -r version_installed="$2" printf "%s\n%s\n" "$min_version" "$version_installed" \ | sort -Vc > /dev/null 2>&1 } # Make sure we have the tools we need and the arguments make sense check_deps() { ABIDIFF="${ABIDIFF:-abidiff}" CC="${CC:-gcc}" ARCH="${ARCH:-$(uname -m)}" if [ "$ARCH" = "x86_64" ]; then ARCH="x86" fi local -r abidiff_min_version="2.4" local -r libdw_min_version_if_clang="0.171" if ! command -v "$ABIDIFF" > /dev/null 2>&1; then eprintf "error - abidiff not found!\n" eprintf "Please install abigail-tools version %s or greater\n" "$abidiff_min_version" eprintf "See: https://sourceware.org/libabigail/manual/libabigail-overview.html\n" return 1 fi local -r abidiff_version="$("$ABIDIFF" --version | cut -d ' ' -f 2)" if ! min_version_is_satisfied "$abidiff_min_version" "$abidiff_version"; then eprintf "error - abidiff version too old: %s\n" "$abidiff_version" eprintf "Please install abigail-tools version %s or greater\n" "$abidiff_min_version" eprintf "See: https://sourceware.org/libabigail/manual/libabigail-overview.html\n" return 1 fi if ! command -v "$CC" > /dev/null 2>&1; then eprintf 'error - %s not found\n' "$CC" return 1 fi if "$CC" --version | grep -q clang; then local -r libdw_version="$(ldconfig -v 2>/dev/null | grep -v SKIPPED | grep -m 1 -o 'libdw-[0-9]\+.[0-9]\+' | cut -c 7-)" if ! min_version_is_satisfied "$libdw_min_version_if_clang" "$libdw_version"; then eprintf "error - libdw version too old for use with clang: %s\n" "$libdw_version" eprintf "Please install libdw from elfutils version %s or greater\n" "$libdw_min_version_if_clang" eprintf "See: https://sourceware.org/elfutils/\n" return 1 fi fi if [ ! -d "arch/${ARCH}" ]; then eprintf 'error - ARCH "%s" is not a subdirectory under arch/\n' "$ARCH" eprintf "Please set ARCH to one of:\n%s\n" "$(find arch -maxdepth 1 -mindepth 1 -type d -printf '%f ' | fmt)" return 1 fi if ! git rev-parse --is-inside-work-tree > /dev/null 2>&1; then eprintf "error - this script requires the kernel tree to be initialized with Git\n" return 1 fi if ! git rev-parse --verify "$past_ref" > /dev/null 2>&1; then printf 'error - invalid git reference "%s"\n' "$past_ref" return 1 fi if [ -n "$base_ref" ]; then if ! git merge-base --is-ancestor "$past_ref" "$base_ref" > /dev/null 2>&1; then printf 'error - "%s" is not an ancestor of base ref "%s"\n' "$past_ref" "$base_ref" return 1 fi if [ "$(git rev-parse "$base_ref")" = "$(git rev-parse "$past_ref")" ]; then printf 'error - "%s" and "%s" are the same reference\n' "$past_ref" "$base_ref" return 1 fi fi } run() { local base_ref="$1" local past_ref="$2" local abi_error_log="$3" shift 3 if [ -z "$KERNEL_SRC" ]; then KERNEL_SRC="$(realpath "$(dirname "$0")"/..)" fi cd "$KERNEL_SRC" if [ -z "$base_ref" ] && ! tree_is_dirty; then base_ref=HEAD fi if [ -z "$past_ref" ]; then if [ -n "$base_ref" ]; then past_ref="${base_ref}^1" else past_ref=HEAD fi fi if ! check_deps; then exit "$FAIL_PREREQ" fi TMP_DIR=$(mktemp -d) readonly TMP_DIR trap 'rm -rf "$TMP_DIR"' EXIT readonly INCOMPAT_LIST="${TMP_DIR}/incompat_list.txt" touch "$INCOMPAT_LIST" readonly SUPPRESSIONS="${TMP_DIR}/suppressions.txt" gen_suppressions > "$SUPPRESSIONS" # Run make install_headers for both refs install_headers "$base_ref" "$past_ref" # Check for any differences in the installed header trees if diff -r -q "$(get_header_tree "$base_ref")" "$(get_header_tree "$past_ref")" > /dev/null 2>&1; then printf "No changes to UAPI headers were applied between %s and %s\n" "$past_ref" "${base_ref:-dirty tree}" exit "$SUCCESS" fi if ! check_uapi_files "$base_ref" "$past_ref" "$abi_error_log"; then exit "$FAIL_ABI" fi } main() { MAX_THREADS=$(nproc) VERBOSE="false" IGNORE_AMBIGUOUS_CHANGES="false" quiet="false" local base_ref="" while getopts "hb:p:j:l:iqv" opt; do case $opt in h) print_usage exit "$SUCCESS" ;; b) base_ref="$OPTARG" ;; p) past_ref="$OPTARG" ;; j) MAX_THREADS="$OPTARG" ;; l) abi_error_log="$OPTARG" ;; i) IGNORE_AMBIGUOUS_CHANGES="true" ;; q) quiet="true" VERBOSE="false" ;; v) VERBOSE="true" quiet="false" ;; *) exit "$FAIL_PREREQ" esac done if [ "$quiet" = "true" ]; then exec > /dev/null 2>&1 fi run "$base_ref" "$past_ref" "$abi_error_log" "$@" } main "$@"
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