linux-kernel - [PATCH v2 06/16] elf, uapi: Add types ElfXX_Verdef and ElfXX

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Message-Id: <20250226-parse_vdso-nolibc-v2-6-28e14e031ed8@linutronix.de>
Date: Wed, 26 Feb 2025 12:44:45 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Kees Cook <kees@...nel.org>, Eric Biederman <ebiederm@...ssion.com>, 
 Shuah Khan <shuah@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <ndesaulniers@...gle.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
 Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>, Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>
Cc: "Jason A. Donenfeld" <Jason@...c4.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, linux-mm@...ck.org, 
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 llvm@...ts.linux.dev, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v2 06/16] elf, uapi: Add types ElfXX_Verdef and
 ElfXX_Veraux

The types are used by tools/testing/selftests/vDSO/parse_vdso.c.
To be able to build the vDSO selftests without a libc dependency,
add the types to the kernels own UAPI headers.

Link: https://refspecs.linuxfoundation.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/symversion.html#VERDEFEXTS
Reviewed-by: Kees Cook <kees@...nel.org>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 include/uapi/linux/elf.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 8846fe03ca5b836c96aad1be6d8fb9daf3d4b1d9..49f9f90458d8ca8e7b8f823d32be0a719ff827b3 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -491,4 +491,34 @@ typedef struct elf64_note {
 /* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */
 #define GNU_PROPERTY_AARCH64_FEATURE_1_BTI	(1U << 0)

+typedef struct {
+  Elf32_Half	vd_version;
+  Elf32_Half	vd_flags;
+  Elf32_Half	vd_ndx;
+  Elf32_Half	vd_cnt;
+  Elf32_Word	vd_hash;
+  Elf32_Word	vd_aux;
+  Elf32_Word	vd_next;
+} Elf32_Verdef;
+
+typedef struct {
+  Elf64_Half	vd_version;
+  Elf64_Half	vd_flags;
+  Elf64_Half	vd_ndx;
+  Elf64_Half	vd_cnt;
+  Elf64_Word	vd_hash;
+  Elf64_Word	vd_aux;
+  Elf64_Word	vd_next;
+} Elf64_Verdef;
+
+typedef struct {
+  Elf32_Word    vda_name;
+  Elf32_Word    vda_next;
+} Elf32_Verdaux;
+
+typedef struct {
+  Elf64_Word    vda_name;
+  Elf64_Word    vda_next;
+} Elf64_Verdaux;
+
 #endif /* _UAPI_LINUX_ELF_H */

-- 
2.48.1