| .. 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. |
