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Bug 629635 part 5 - Gracefully abort elfhack when injected code+data is bigger than original relocation section. r=tglek,a=blocking2.0:final

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This commit is contained in:
Mike Hommey 2011-02-12 10:28:34 +01:00
parent ea18252b06
commit 4bd909605b
1 changed files with 10 additions and 4 deletions
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14
build/unix/elfhack/elfhack.cpp
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@ -377,6 +377,7 @@ int do_relocation_section(Elf *elf, unsigned int rel_type)
relhackcode->insertAfter(section);
relhack->insertAfter(relhackcode);
unsigned int old_end = section->getOffset() + section->getSize();
section->rels.assign(new_rels.begin(), new_rels.end());
section->shrink(new_rels.size() * section->getEntSize());
ElfLocation *init = new ElfLocation(relhackcode, relhackcode->getEntryPoint());
@ -384,6 +385,11 @@ int do_relocation_section(Elf *elf, unsigned int rel_type)
// TODO: adjust the value according to the remaining number of relative relocations
if (dyn->getValueForType(Rel_Type::d_tag_count))
dyn->setValueForType(Rel_Type::d_tag_count, new ElfPlainValue(0));
if (relhack->getOffset() + relhack->getSize() >= old_end) {
fprintf(stderr, "No gain. Aborting\n");
return -1;
}
return 0;
}
@ -413,10 +419,10 @@ void do_file(const char *name, bool backup = false)
exit = do_relocation_section<Elf_Rel>(elf, R_ARM_RELATIVE);
break;
}
if (elf->getSize() >= size)
fprintf(stderr, "No gain. Aborting\n");
else if (exit == 0) {
if (backup && backup_file(name) != 0) {
if (exit == 0) {
if (elf->getSize() >= size) {
fprintf(stderr, "No gain. Aborting\n");
} else if (backup && backup_file(name) != 0) {
fprintf(stderr, "Couln't create backup file\n");
} else {
std::ofstream ofile(name, std::ios::out|std::ios::binary|std::ios::trunc);