linux-hardening - [PATCH] ELF: Properly redefine PT_GNU_* in terms of PT

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Message-Id: <20220224054011.1852264-1-keescook@chromium.org>
Date:   Wed, 23 Feb 2022 21:40:11 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Eric Biederman <ebiederm@...ssion.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Peter Collingbourne <pcc@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Martin <Dave.Martin@....com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH] ELF: Properly redefine PT_GNU_* in terms of PT_LOOS

The PT_GNU_* program header types are actually offsets from PT_LOOS,
so redefine them as such, reorder them, and add the missing PT_GNU_RELRO.

Cc: Eric Biederman <ebiederm@...ssion.com>
Cc: Peter Collingbourne <pcc@...gle.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Dave Martin <Dave.Martin@....com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 include/uapi/linux/elf.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 61bf4774b8f2..6438d55529bf 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -35,10 +35,11 @@ typedef __s64	Elf64_Sxword;
 #define PT_HIOS    0x6fffffff      /* OS-specific */
 #define PT_LOPROC  0x70000000
 #define PT_HIPROC  0x7fffffff
-#define PT_GNU_EH_FRAME		0x6474e550
-#define PT_GNU_PROPERTY		0x6474e553
-
+#define PT_GNU_EH_FRAME	(PT_LOOS + 0x474e550)
 #define PT_GNU_STACK	(PT_LOOS + 0x474e551)
+#define PT_GNU_RELRO	(PT_LOOS + 0x474e552)
+#define PT_GNU_PROPERTY	(PT_LOOS + 0x474e553)
+
 
 /*
  * Extended Numbering
-- 
2.30.2