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