linux-kernel - [PATCH v2 03/16] elf, uapi: Add definition for DT_GNU

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Message-Id: <20250226-parse_vdso-nolibc-v2-3-28e14e031ed8@linutronix.de>
Date: Wed, 26 Feb 2025 12:44:42 +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 03/16] elf, uapi: Add definition for DT_GNU_HASH

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

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

diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 448695c7364042b10682acc8223eb6053ad039dd..c5383cc7bb13c931fea083de5243c4006f795006 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -107,6 +107,7 @@ typedef __s64	Elf64_Sxword;
 #define DT_VALRNGLO	0x6ffffd00
 #define DT_VALRNGHI	0x6ffffdff
 #define DT_ADDRRNGLO	0x6ffffe00
+#define DT_GNU_HASH	0x6ffffef5
 #define DT_ADDRRNGHI	0x6ffffeff
 #define DT_VERSYM	0x6ffffff0
 #define DT_RELACOUNT	0x6ffffff9

-- 
2.48.1