linux-kernel - [PATCH v8 01/11] ELF: UAPI and Kconfig additions for ELF program properties

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Message-Id: <20200227174417.23722-2-broonie@kernel.org>
Date:   Thu, 27 Feb 2020 17:44:07 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Paul Elliott <paul.elliott@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Amit Kachhap <amit.kachhap@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marc Zyngier <maz@...nel.org>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        "H . J . Lu " <hjl.tools@...il.com>,
        Andrew Jones <drjones@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>, Jann Horn <jannh@...gle.com>,
        Richard Henderson <richard.henderson@...aro.org>,
        Kristina Martšenko <kristina.martsenko@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Florian Weimer <fweimer@...hat.com>,
        Sudakshina Das <sudi.das@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Dave Martin <Dave.Martin@....com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH v8 01/11] ELF: UAPI and Kconfig additions for ELF program properties

From: Dave Martin <Dave.Martin@....com>

Pull the basic ELF definitions relating to the
NT_GNU_PROPERTY_TYPE_0 note from Yu-Cheng Yu's earlier x86 shstk
series.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
Signed-off-by: Dave Martin <Dave.Martin@....com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 fs/Kconfig.binfmt        |  3 +++
 include/linux/elf.h      | 12 ++++++++++++
 include/uapi/linux/elf.h |  1 +
 3 files changed, 16 insertions(+)

diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index 62dc4f577ba1..d2cfe0729a73 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/linux/elf.h b/include/linux/elf.h
index e3649b3e970e..f7b24c5fcfb6 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -2,6 +2,7 @@
 #ifndef _LINUX_ELF_H
 #define _LINUX_ELF_H
 
+#include <linux/types.h>
 #include <asm/elf.h>
 #include <uapi/linux/elf.h>
 
@@ -56,4 +57,15 @@ static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) {
 extern int elf_coredump_extra_notes_size(void);
 extern int elf_coredump_extra_notes_write(struct coredump_params *cprm);
 #endif
+
+/*
+ * NT_GNU_PROPERTY_TYPE_0 header:
+ * Keep this internal until/unless there is an agreed UAPI definition.
+ * pr_type values (GNU_PROPERTY_*) are public and defined in the UAPI header.
+ */
+struct gnu_property {
+	u32 pr_type;
+	u32 pr_datasz;
+};
+
 #endif /* _LINUX_ELF_H */
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 34c02e4290fe..c37731407074 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)
 
-- 
2.20.1