1.. SPDX-License-Identifier: GPL-2.0
2
3=================================
4Linux-specific ELF idiosyncrasies
5=================================
6
7Definitions
8===========
9
10"First" program header is the one with the smallest offset in the file:
11e_phoff.
12
13"Last" program header is the one with the biggest offset in the file:
14e_phoff + (e_phnum - 1) * sizeof(Elf_Phdr).
15
16PT_INTERP
17=========
18
19First PT_INTERP program header is used to locate the filename of ELF
20interpreter. Other PT_INTERP headers are ignored (since Linux 2.4.11).
21
22PT_GNU_STACK
23============
24
25Last PT_GNU_STACK program header defines userspace stack executability
26(since Linux 2.6.6). Other PT_GNU_STACK headers are ignored.
27
28PT_GNU_PROPERTY
29===============
30
31ELF interpreter's last PT_GNU_PROPERTY program header is used (since
32Linux 5.8). If interpreter doesn't have one, then the last PT_GNU_PROPERTY
33program header of an executable is used. Other PT_GNU_PROPERTY headers
34are ignored.
35