linux-kernel - [PATCH v2] ELF: document some de-facto PT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c4233c97-306c-4db8-9667-34fc31ec4aed@p183>
Date:   Sun, 26 Mar 2023 19:49:49 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Jonathan Corbet <corbet@....net>,
        Randy Dunlap <rdunlap@...radead.org>,
        Bagas Sanjaya <bagasdotme@...il.com>
Subject: [PATCH v2] ELF: document some de-facto PT_* ABI quirks

Turns out rules about PT_INTERP, PT_GNU_STACK and PT_GNU_PROPERTY
program headers are slightly different.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

	v2: integrate into documentation build system

 Documentation/ELF/ELF.rst   |   32 ++++++++++++++++++++++++++++++++
 Documentation/ELF/index.rst |   10 ++++++++++
 Documentation/index.rst     |    1 +
 3 files changed, 43 insertions(+)

new file mode 100644
--- /dev/null
+++ b/Documentation/ELF/ELF.rst
@@ -0,0 +1,32 @@
+.. 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:
+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.
new file mode 100644
--- /dev/null
+++ b/Documentation/ELF/index.rst
@@ -0,0 +1,10 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===
+ELF
+===
+
+.. toctree::
+   :maxdepth: 1
+
+   ELF
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -113,6 +113,7 @@ to ReStructured Text format, or are simply too old.
    :maxdepth: 1
 
    staging/index
+   ELF/index
 
 
 Translations