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139 lines
6.0 KiB
139 lines
6.0 KiB
1 month ago
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#! /bin/bash
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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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for module in $(grep -E '/lib/modules/.+\.ko(\.gz|\.bz2|\.xz|\.zst)?$') "$@"; do
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dep_pfx="ksym"
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# For built-in kmods, "kernel()" syntax is used instead of "ksym()"
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printf "%s" "$module" | grep -v "^${RPM_BUILD_ROOT}/\?lib/modules/[1-9][^/]*/kernel" > /dev/null \
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|| dep_pfx="kernel"
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tmpfile=""
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if [ "x${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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# A modversion can be stored as an ELF symbol in various ways:
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# - An immediate symbol whose value is available directly; it shows up
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# in the nm or objdump -t output, for example:
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# $ nm mlx5_core_5.14.x86_64.ko | grep '__crc_' | head -n 3
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# 0000000092f175ca A __crc_mlx5_access_reg
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# 000000005b88c9f1 A __crc_mlx5_add_flow_rules
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# 00000000e7c0ec8a A __crc_mlx5_alloc_bfreg
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# $ objdump -t lib/modules/mlx5_core_5.14.x86_64.ko | grep __crc_ | sort -k 5,5 | head -n 3
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# 0000000092f175ca g *ABS* 0000000000000000 __crc_mlx5_access_reg
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# 000000005b88c9f1 g *ABS* 0000000000000000 __crc_mlx5_add_flow_rules
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# 00000000e7c0ec8a g *ABS* 0000000000000000 __crc_mlx5_alloc_bfreg
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# $ zgrep mlx5_access_reg ./lib/modules/5.14.0-284.15.1.el9_2.x86_64/symvers.gz
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# 0x92f175ca mlx5_access_reg drivers/net/ethernet/mellanox/mlx5/core/mlx5_core EXPORT_SYMBOL_GPL
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# This approach was being used on x86 and arm before Linux 5.19,
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# for example.
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#
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# - A globally or locally visible symbol in a read-only (or not;
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# sometimes .rodata is not a read-only section, after all, as binutils
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# commit binutils-2_33~1385 has revealed (and binutils-2_35~1768 hasn't
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# concealed back)) section (historically .rodata, __kcrctab/__kcrctab_gpl
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# since Linux v5.19-rc1~139^2~2):
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# $ nm mlx5_core_5.14.s390x.ko | grep '__crc_' | head -n 3
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# 0000000000002f7c R __crc_mlx5_access_reg
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# 0000000000003304 R __crc_mlx5_add_flow_rules
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# 0000000000002d2c R __crc_mlx5_alloc_bfreg
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# This layout is used on ppc since Linux v4.10-rc7~15^2~1, for example,
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# and on all architectures since Linux 5.19. To extract the symbol
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# versions in this case, we get the offset and the section name
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# from the "objdump -t" output:
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# $ objdump -t lib/modules/mlx5_core_5.14.s390x.ko | grep '__crc_' | sort -k 5,5 | head -n 2
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# 0000000000002f7c g .rodata 0000000000000000 __crc_mlx5_access_reg
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# 0000000000003304 g .rodata 0000000000000000 __crc_mlx5_add_flow_rules
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# and the section contents from the "readelf -R" call:
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# $ readelf -R .rodata mlx5_core_5.14.s390x.ko
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# [... skipped output ...]
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# 0x00002f70 6c6f635f 6e6f6465 00000000 ed6560a8 loc_node.....e`.
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# ^^^^^^^^
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# comparison with the contents
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# of lib/modules/5.14.0-284.15.1.el9_2.s390x/symvers.gz corroborates
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# its correctness:
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# 0xed6560a8 mlx5_access_reg drivers/net/ethernet/mellanox/mlx5/core/mlx5_core EXPORT_SYMBOL_GPL
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# As mentioned earlier, for the later kernel versions, __kcrctab{,_gpl}
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# sections are used:
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# $ objdump -t lib/modules/mlx5_core_6.4.x86_64.ko | grep '__crc_' | sort -k 5,5 | head -n 2
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# 0000000000000000 l __kcrctab_gpl 0000000000000000 __crc_mlx5_access_reg
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# 0000000000000090 l __kcrctab 0000000000000000 __crc_mlx5_add_flow_rules
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# $ readelf -R __kcrctab_gpl mlx5_core_6.4.x86_64.ko
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# 0x00000000 38b0d3c3 1840ce35 b99babc7 70b4700c 8....@.5....p.p.
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# ^^^^^^^^
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# and in lib/modules/6.4.0-0.rc1.20230511git80e62bc8487b.19.eln126.x86_64/symvers.xz
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# we see that it is correct (when accounted for the little endianness):
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# 0xc3d3b038 mlx5_access_reg drivers/net/ethernet/mellanox/mlx5/core/mlx5_core EXPORT_SYMBOL_GPL
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# This data, after some post-processing, can be used in the awk script
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# that extracts parts of the section according to the offsets got
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# from the "objdump -t" output.
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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='"$module" \
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--non-decimal-data \
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'BEGIN { revbytes = 0 }
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function check_endianness( t) {
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if (revbytes) return revbytes;
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revbytes = -1;
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while (("readelf -h \"" module "\"" | getline t) > 0) {
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if (match(t, /^ Data: *2\047s complement, little endian$/)) {
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revbytes = 1;
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break;
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}
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}
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return revbytes;
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}
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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 (check_endianness() == 1)
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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] == "*ABS*") {
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printf("%s(%s) = 0x%08x\n", dep_pfx, a[3], strtonum("0x" a[1]));
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} else {
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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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