linux-kernel - [RFC PATCH 1/2] ELF: UAPI and Kconfig additions for ELF program properties

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Date:   Tue, 20 Aug 2019 10:57:42 +0100
From:   Dave Martin <Dave.Martin@....com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [RFC PATCH 1/2] ELF: UAPI and Kconfig additions for ELF program properties

Pull the basic ELF definitions from Yu-Cheng Yu's series.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
Signed-off-by: Dave Martin <Dave.Martin@....com>

---

This patch should be merged with the next patch.

I kept it seprate for now to document where this code came from.
---
 fs/Kconfig.binfmt        | 3 +++
 include/uapi/linux/elf.h | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index 62dc4f5..d2cfe07 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -36,6 +36,9 @@ config COMPAT_BINFMT_ELF
 config ARCH_BINFMT_ELF_STATE
 	bool
 
+config ARCH_USE_GNU_PROPERTY
+	bool
+
 config BINFMT_ELF_FDPIC
 	bool "Kernel support for FDPIC ELF binaries"
 	default y if !BINFMT_ELF
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 34c02e4..a3eaad9 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -36,6 +36,7 @@ typedef __s64	Elf64_Sxword;
 #define PT_LOPROC  0x70000000
 #define PT_HIPROC  0x7fffffff
 #define PT_GNU_EH_FRAME		0x6474e550
+#define PT_GNU_PROPERTY		0x6474e553
 
 #define PT_GNU_STACK	(PT_LOOS + 0x474e551)
 
@@ -443,4 +444,10 @@ typedef struct elf64_note {
   Elf64_Word n_type;	/* Content type */
 } Elf64_Nhdr;
 
+/* NT_GNU_PROPERTY_TYPE_0 header */
+struct gnu_property {
+  __u32 pr_type;
+  __u32 pr_datasz;
+};
+
 #endif /* _UAPI_LINUX_ELF_H */
-- 
2.1.4