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On csky-linux-gnuabiv2, binutils 2.33 produces a DT_JMPREL entry for the dynamic loader if it does not contain any PLT relocations: Dynamic section at offset 0x1df48 contains 19 entries: Tag Type Name/Value 0x0000000e (SONAME) Library soname: [ld-linux-cskyv2-hf.so.1] 0x00000004 (HASH) 0xd4 0x6ffffef5 (GNU_HASH) 0x1a8 0x00000005 (STRTAB) 0x4ac 0x00000006 (SYMTAB) 0x28c 0x0000000a (STRSZ) 527 (bytes) 0x0000000b (SYMENT) 16 (bytes) 0x00000003 (PLTGOT) 0x1f000 0x00000002 (PLTRELSZ) 0 (bytes) 0x00000014 (PLTREL) RELA 0x00000017 (JMPREL) 0xaa4 0x00000007 (RELA) 0x75c 0x00000008 (RELASZ) 840 (bytes) 0x00000009 (RELAENT) 12 (bytes) 0x6ffffffc (VERDEF) 0x700 0x6ffffffd (VERDEFNUM) 3 0x6ffffff0 (VERSYM) 0x6bc 0x6ffffff9 (RELACOUNT) 68 0x00000000 (NULL) 0x0 This confuses the script: Unexpected output from check-localplt: …/elf/ld.so.jmprel: *** DT_JMPREL does not match any section's address This commit changes the script to record the DT_PLTRELSZ value and reject DT_JMPREL values not a section boundary only if DT_PLTRELSZ is present with a non-zero value. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
125 lines
3.3 KiB
Awk
125 lines
3.3 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 {
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result = 0;
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pltrelsize = -1;
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}
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FILENAME != lastfile {
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if (lastfile && jmprel_offset == 0 && rela_offset == 0 && rel_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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if (pltrelsz > 0 && jmprel_offset == -1) {
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print FILENAME ": Could not find section for DT_JMPREL";
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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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rela_offset = 0;
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rel_offset = 0;
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pltrelsz = -1;
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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, gensub(/@.*/, "", "g", $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, gensub(/@.*/, "", "g", $5)
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}
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}
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in_relocs && relocs_offset == rela_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, gensub(/@.*/, "", "g", $5), "RELA", $3
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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, gensub(/@.*/, "", "g", $5), "RELA", $3
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}
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}
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in_relocs && relocs_offset == rel_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, gensub(/@.*/, "", "g", $5), "REL", $3
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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, gensub(/@.*/, "", "g", $5), "REL", $3
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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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jmprel_offset = -1
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}
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next
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}
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$2 == "(PLTRELSZ)" {
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pltrelsz = strtonum($3);
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next
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}
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$2 == "(RELA)" {
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rela_addr = strtonum($3);
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if (rela_addr in section_offset_by_address) {
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rela_offset = section_offset_by_address[rela_addr];
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} else {
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print FILENAME ": *** DT_RELA 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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$2 == "(REL)" {
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rel_addr = strtonum($3);
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if (rel_addr in section_offset_by_address) {
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rel_offset = section_offset_by_address[rel_addr];
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} else {
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print FILENAME ": *** DT_REL 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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