| .. SPDX-License-Identifier: GPL-2.0 | |
| ================================= | |
| Linux-specific ELF idiosyncrasies | |
| ================================= | |
| Definitions | |
| =========== | |
| "First" program header is the one with the smallest offset in the file: | |
| e_phoff. | |
| "Last" program header is the one with the biggest offset in the file: | |
| e_phoff + (e_phnum - 1) * sizeof(Elf_Phdr). | |
| PT_INTERP | |
| ========= | |
| First PT_INTERP program header is used to locate the filename of ELF | |
| interpreter. Other PT_INTERP headers are ignored (since Linux 2.4.11). | |
| PT_GNU_STACK | |
| ============ | |
| Last PT_GNU_STACK program header defines userspace stack executability | |
| (since Linux 2.6.6). Other PT_GNU_STACK headers are ignored. | |
| PT_GNU_PROPERTY | |
| =============== | |
| ELF interpreter's last PT_GNU_PROPERTY program header is used (since | |
| Linux 5.8). If interpreter doesn't have one, then the last PT_GNU_PROPERTY | |
| program header of an executable is used. Other PT_GNU_PROPERTY headers | |
| are ignored. |