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DT_JMPREL vanished (binutils-2.26.1); check all DT_RELA.

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modified:   p_elf_enum.h
	modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser 2016-10-09 21:50:45 -07:00
parent 97e975b4f6
commit d688a05ac7
2 changed files with 32 additions and 0 deletions
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1
src/p_elf_enum.h
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@ -146,6 +146,7 @@
DT_STRTAB = 5, /* String table */ DT_STRTAB = 5, /* String table */
DT_SYMTAB = 6, /* Symbol table */ DT_SYMTAB = 6, /* Symbol table */
DT_RELA = 7, /* Relocations which do contain an addend */ DT_RELA = 7, /* Relocations which do contain an addend */
DT_RELASZ = 8, /* Total size of Rela relocs */
DT_RELAENT = 9, /* Size of one RELA relocation */ DT_RELAENT = 9, /* Size of one RELA relocation */
DT_INIT = 12, /* Address of init function */ DT_INIT = 12, /* Address of init function */
DT_REL = 17, /* Relocations which contain no addend */ DT_REL = 17, /* Relocations which contain no addend */

31
src/p_lx_elf.cpp
View File

@ -1702,6 +1702,8 @@ PackLinuxElf64ppcle::canPack()
// which references the symbol, because DT_GNU_HASH contains only // which references the symbol, because DT_GNU_HASH contains only
// defined symbols, and there might be no DT_HASH. // defined symbols, and there might be no DT_HASH.
Elf64_Rela const *
rela= (Elf64_Rela const *)elf_find_dynamic(Elf64_Dyn::DT_RELA);
Elf64_Rela const * Elf64_Rela const *
jmprela= (Elf64_Rela const *)elf_find_dynamic(Elf64_Dyn::DT_JMPREL); jmprela= (Elf64_Rela const *)elf_find_dynamic(Elf64_Dyn::DT_JMPREL);
for ( int sz = elf_unsigned_dynamic(Elf64_Dyn::DT_PLTRELSZ); for ( int sz = elf_unsigned_dynamic(Elf64_Dyn::DT_PLTRELSZ);
@ -1716,6 +1718,19 @@ PackLinuxElf64ppcle::canPack()
goto proceed; goto proceed;
} }
// 2016-10-09 DT_JMPREL is no more (binutils-2.26.1)?
// Check the general case, too.
for ( int sz = elf_unsigned_dynamic(Elf64_Dyn::DT_RELASZ);
0 < sz;
(sz -= sizeof(Elf64_Rela)), ++rela
) {
unsigned const symnum = get_te64(&rela->r_info) >> 32;
char const *const symnam = get_te32(&dynsym[symnum].st_name) + dynstr;
if (0==strcmp(symnam, "__libc_start_main")
|| 0==strcmp(symnam, "__uClibc_main")
|| 0==strcmp(symnam, "__uClibc_start_main"))
goto proceed;
}
// Heuristic HACK for shared libraries (compare Darwin (MacOS) Dylib.) // Heuristic HACK for shared libraries (compare Darwin (MacOS) Dylib.)
// If there is an existing DT_INIT, and if everything that the dynamic // If there is an existing DT_INIT, and if everything that the dynamic
// linker ld-linux needs to perform relocations before calling DT_INIT // linker ld-linux needs to perform relocations before calling DT_INIT
@ -1878,6 +1893,8 @@ PackLinuxElf64amd::canPack()
// which references the symbol, because DT_GNU_HASH contains only // which references the symbol, because DT_GNU_HASH contains only
// defined symbols, and there might be no DT_HASH. // defined symbols, and there might be no DT_HASH.
Elf64_Rela const *
rela= (Elf64_Rela const *)elf_find_dynamic(Elf64_Dyn::DT_RELA);
Elf64_Rela const * Elf64_Rela const *
jmprela= (Elf64_Rela const *)elf_find_dynamic(Elf64_Dyn::DT_JMPREL); jmprela= (Elf64_Rela const *)elf_find_dynamic(Elf64_Dyn::DT_JMPREL);
for ( int sz = elf_unsigned_dynamic(Elf64_Dyn::DT_PLTRELSZ); for ( int sz = elf_unsigned_dynamic(Elf64_Dyn::DT_PLTRELSZ);
@ -1892,6 +1909,20 @@ PackLinuxElf64amd::canPack()
goto proceed; goto proceed;
} }
// 2016-10-09 DT_JMPREL is no more (binutils-2.26.1)?
// Check the general case, too.
for ( int sz = elf_unsigned_dynamic(Elf64_Dyn::DT_RELASZ);
0 < sz;
(sz -= sizeof(Elf64_Rela)), ++rela
) {
unsigned const symnum = get_te64(&rela->r_info) >> 32;
char const *const symnam = get_te32(&dynsym[symnum].st_name) + dynstr;
if (0==strcmp(symnam, "__libc_start_main")
|| 0==strcmp(symnam, "__uClibc_main")
|| 0==strcmp(symnam, "__uClibc_start_main"))
goto proceed;
}
// Heuristic HACK for shared libraries (compare Darwin (MacOS) Dylib.) // Heuristic HACK for shared libraries (compare Darwin (MacOS) Dylib.)
// If there is an existing DT_INIT, and if everything that the dynamic // If there is an existing DT_INIT, and if everything that the dynamic
// linker ld-linux needs to perform relocations before calling DT_INIT // linker ld-linux needs to perform relocations before calling DT_INIT