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195 lines
7.0 KiB
195 lines
7.0 KiB
#! /bin/bash
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#
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# This script is called during external module building to create dependencies
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# both upon the RHEL kernel, and on additional external modules. Symbols that
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# cannot be reconciled against those provided by the kernel are assumed to be
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# provided by an external module and "ksym" replaces th regular "kernel" dep.
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IFS=$'\n'
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export LC_ALL=C
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# Prevent elfutils from trying to download debuginfos
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unset DEBUGINFOD_URLS
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# Extract all of the symbols provided by this module.
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all_provides() {
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for module in "$@"; do
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tmpfile=""
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if [ "x${module%.ko}" = "x${module}" ]; then
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tmpfile=$(mktemp -t ${0##*/}.XXXXXX.ko)
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proc_bin=
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case "${module##*.}" in
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zst)
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proc_bin=zstd
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;;
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xz)
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proc_bin=xz
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;;
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bz2)
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proc_bin=bzip2
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;;
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gz)
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proc_bin=gzip
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;;
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esac
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[ -n "$proc_bin" ] || continue
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"$proc_bin" -d -c - < "$module" > "$tmpfile" || continue
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module="$tmpfile"
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fi
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# awk script return code:
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# 0 - absolute __crc_* symbols have been found, output has been
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# generated;
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# 23 - a non-absolute __crc_* symbold has been found;
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# 42 - no __crc_* symbols have been found.
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nm "$module" \
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| awk \
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-v 'dep_pfx='"$dep_pfx" \
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--non-decimal-data \
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'BEGIN { exit_code = 42 }
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match($0, /^([0-9a-f]+) (.) __crc_(.+)/, a) {
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if (a[2] == "A") {
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printf("%s(%s) = 0x%08x\n", dep_pfx, a[3], strtonum("0x" a[1]));
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exit_code = 0;
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} else {
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exit_code = 23;
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exit;
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}
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}
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END { exit exit_code }'
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[ 23 = "$?" ] && {
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kmod_elf_hdr="$(readelf -h "$module")"
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[ "x$kmod_elf_hdr" = "x${kmod_elf_hdr%Data:*little endian*}" ]
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revbytes="$?"
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objdump -t "$module" \
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| awk \
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-v 'dep_pfx='"$dep_pfx" \
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-v 'module='"$module" \
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-v 'revbytes='"$revbytes" \
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--non-decimal-data \
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'function readsect(name, a, t) {
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a = "";
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while (("readelf -R \"" name "\" \"" module "\"" | getline t) > 0) {
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if (match(t, /^ 0x[0-9a-f]{8}/))
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a = a substr(t, 14, 8) substr(t, 23, 8) substr(t, 32, 8) substr(t, 41, 8);
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}
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if (revbytes) { a = gensub(/(..)(..)(..)(..)/, "\\4\\3\\2\\1", "g", a); }
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sectdata[name] = a;
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}
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match($0, /^([0-9a-f]+) [gl]...... (.*) [0-9a-f]+ __crc_(.*)$/, a) {
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if (!(a[2] in sectdata)) { readsect(a[2]) }
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printf("%s(%s) = 0x%08s\n", dep_pfx, a[3], substr(sectdata[a[2]], (strtonum("0x" a[1]) * 2) + 1, 8))
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}'
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}
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[ -z "$tmpfile" ] || rm -f -- "$tmpfile"
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done \
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| sort -k1,1 -u
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}
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# Extract all of the requirements of this module.
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all_requires() {
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for module in "$@"; do
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set -- $(/sbin/modinfo -F vermagic "$module" | sed -e 's: .*::' -e q)
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/sbin/modprobe --dump-modversions "$module" \
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| awk --non-decimal-data '
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BEGIN { FS = "\t" ; OFS = "\t" }
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{printf("%s:0x%08x\n", $2, $1)}' \
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| sed -r -e 's:$:\t'"$1"':'
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done \
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| sort -k1,1 -u
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}
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# Filter out requirements fulfilled by the module itself.
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mod_requires() {
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join -t $'\t' -j 1 -v 1 \
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<(all_requires "$@") \
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<(all_provides "$@") \
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| sort -k1,1 -u
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}
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if ! [ -e /sbin/modinfo -a -e /sbin/modprobe ]; then
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cat > /dev/null
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exit 0
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fi
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check_kabi() {
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arch=$(uname -m)
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kabi_file="/lib/modules/kabi-current/kabi_stablelist_$arch"
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# If not installed, output a warning and return (continue)
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if [ ! -f "$kabi_file" ]; then
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echo "" >&2
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echo "********************************************************************************" >&2
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echo "*********************** KERNEL ABI COMPATIBILITY WARNING ***********************" >&2
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echo "********************************************************************************" >&2
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echo "The kernel ABI reference files (provided by "kabi-stablelists") were not found." >&2
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echo "No compatibility check was performed. Please install the kABI reference files" >&2
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echo "and rebuild if you would like to verify compatibility with kernel ABI." >&2
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echo "" >&2
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return
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fi
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unset non_kabi
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for symbol in "$@"; do
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if ! egrep "^[[:space:]]$symbol\$" $kabi_file >/dev/null; then
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non_kabi=("${non_kabi[@]}" "$symbol")
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fi
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done
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if [ ${#non_kabi[@]} -gt 0 ]; then
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echo "" >&2
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echo "********************************************************************************" >&2
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echo "*********************** KERNEL ABI COMPATIBILITY WARNING ***********************" >&2
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echo "********************************************************************************" >&2
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echo "The following kernel symbols are not guaranteed to remain compatible with" >&2
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echo "future kernel updates to this RHEL release:" >&2
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echo "" >&2
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for symbol in "${non_kabi[@]}"; do
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printf "\t$symbol\n" >&2
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done
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echo "" >&2
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echo "Red Hat recommends that you consider using only official kernel ABI symbols" >&2
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echo "where possible. Requests for additions to the kernel ABI can be filed with" >&2
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echo "your partner or customer representative (component: driver-update-program)." >&2
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echo "" >&2
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fi
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}
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modules=($(grep -E '/lib/modules/.+\.ko(\.gz|\.bz2|\.xz|\.zst)?$') "$@")
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if [ ${#modules[@]} -gt 0 ]; then
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kernel=$(/sbin/modinfo -F vermagic "${modules[0]}" | sed -e 's: .*::' -e q)
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# get all that kernel provides
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symvers=$(mktemp -t ${0##*/}.XXXXX)
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cat /usr/src/kernels/$kernel/Module.symvers | awk '
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BEGIN { FS = "\t" ; OFS = "\t" }
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{ print $2 ":" $1 }
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' \
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| sed -r -e 's:$:\t'"$kernel"':' \
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| sort -k1,1 -u > $symvers
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# Symbols matching with the kernel get a "kernel" dependency
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mod_req=$(mktemp -t mod_req.XXXXX)
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mod_requires "${modules[@]}" > "$mod_req"
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join -t $'\t' -j 1 $symvers "$mod_req" | sort -u \
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| awk 'BEGIN { FS = "[\t:]" ; OFS = "\t" } { print "kernel(" $1 ") = " $2 }'
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# Symbols from elsewhere get a "ksym" dependency
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join -t $'\t' -j 1 -v 2 $symvers "$mod_req" | sort -u \
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| awk 'BEGIN { FS = "[\t:]" ; OFS = "\t" } { print "ksym(" $1 ") = " $2 }'
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# Check kABI if the kabi-stablelists package is installed
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# Do this last so we can try to output this error at the end
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kabi_check_symbols=($(join -t $'\t' -j 1 $symvers "$mod_req" | sort -u \
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| awk 'BEGIN { FS = "[\t:]" ; OFS = "\t" } { print $1 }'))
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check_kabi "${kabi_check_symbols[@]}"
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fi
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