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ldso: check for DYNAMIC segment in ELF files

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If the DYNAMIC segment cannot be located the ELF file may be statically
linked. In this case an error is raised.

Fixes #3000
This commit is contained in:
Sebastian Sumpf 2018-09-26 13:47:04 +02:00 committed by Christian Helmuth
parent a8ed11e75b
commit 0cc87d3c85
1 changed files with 14 additions and 0 deletions
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14
repos/base/src/lib/ldso/include/file.h
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@ -183,9 +183,13 @@ struct Linker::Elf_file : File
*/ */
void loadable_segments(Phdr &result) void loadable_segments(Phdr &result)
{ {
bool dynamic = false;
for (unsigned i = 0; i < phdr.count; i++) { for (unsigned i = 0; i < phdr.count; i++) {
Elf::Phdr *ph = &phdr.phdr[i]; Elf::Phdr *ph = &phdr.phdr[i];
if (ph->p_type == PT_DYNAMIC)
dynamic = true;
if (ph->p_type != PT_LOAD) if (ph->p_type != PT_LOAD)
continue; continue;
@ -196,6 +200,16 @@ struct Linker::Elf_file : File
result.phdr[result.count++] = *ph; result.phdr[result.count++] = *ph;
} }
/*
* Check for 'DYNAMIC' segment which should be present in all dynamic ELF
* files.
*/
if (!dynamic) {
error("LD: ELF without DYNAMIC segment appears to be statically linked ",
"(ld=\"no\")");
throw Incompatible();
}
} }
bool is_rx(Elf::Phdr const &ph) { bool is_rx(Elf::Phdr const &ph) {