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7bc5a74162
GNU_IFUNC are shown by readelf in 'Relocation section' value as "symbol()" instead of expected hexadecimal value. This causes the check-localplt script to ignore potential PLT stub begin generated by wrong IFUNC usage. This patch changes the localplt script to emit such PLT cases.
66 lines
1.7 KiB
Awk
66 lines
1.7 KiB
Awk
# This awk script expects to get command-line files that are each
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# the output of 'readelf -WSdr' on a single shared object, and named
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# .../NAME.jmprel where NAME is the unadorned file name of the shared object.
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# It writes "NAME: SYMBOL" for each PLT entry in NAME that refers to a
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# symbol defined in the same object.
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BEGIN { result = 0 }
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FILENAME != lastfile {
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if (lastfile && jmprel_offset == 0) {
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print FILENAME ": *** failed to find expected output (readelf -WSdr)";
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result = 2;
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}
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lastfile = FILENAME;
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jmprel_offset = 0;
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delete section_offset_by_address;
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}
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/^Section Headers:/ { in_shdrs = 1; next }
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in_shdrs && !/^ +\[/ { in_shdrs = 0 }
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in_shdrs && /^ +\[/ { sub(/\[ +/, "[") }
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in_shdrs {
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address = strtonum("0x" $4);
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offset = strtonum("0x" $5);
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section_offset_by_address[address] = offset;
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}
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in_shdrs { next }
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$1 == "Offset" && $2 == "Info" { in_relocs = 1; next }
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NF == 0 { in_relocs = 0 }
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in_relocs && relocs_offset == jmprel_offset && NF >= 5 {
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# Relocations against GNU_IFUNC symbols are not shown as an hexadecimal
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# value, but rather as the resolver symbol followed by ().
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if ($4 ~ /\(\)/) {
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print whatfile, $5
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} else {
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symval = strtonum("0x" $4);
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if (symval != 0)
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print whatfile, $5
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}
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}
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in_relocs { next }
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$1 == "Relocation" && $2 == "section" && $5 == "offset" {
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relocs_offset = strtonum($6);
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whatfile = gensub(/^.*\/([^/]+)\.jmprel$/, "\\1:", 1, FILENAME);
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next
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}
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$2 == "(JMPREL)" {
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jmprel_addr = strtonum($3);
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if (jmprel_addr in section_offset_by_address) {
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jmprel_offset = section_offset_by_address[jmprel_addr];
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} else {
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print FILENAME ": *** DT_JMPREL does not match any section's address";
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result = 2;
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}
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next
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}
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END { exit(result) }
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