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Message-Id: <1452281304-28618-2-git-send-email-jeyu@redhat.com>
Date: Fri, 8 Jan 2016 14:28:19 -0500
From: Jessica Yu <jeyu@...hat.com>
To: Rusty Russell <rusty@...tcorp.com.au>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Seth Jennings <sjenning@...hat.com>,
Jiri Kosina <jikos@...nel.org>,
Vojtech Pavlik <vojtech@...e.com>,
Jonathan Corbet <corbet@....net>,
Miroslav Benes <mbenes@...e.cz>
Cc: linux-api@...r.kernel.org, live-patching@...r.kernel.org,
x86@...nel.org, linux-kernel@...r.kernel.org,
linux-s390@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [RFC PATCH v3 1/6] Elf: add livepatch-specific Elf constants
Add livepatch Elf relocation section flag (SHF_RELA_LIVEPATCH), and symbol
section index (SHN_LIVEPATCH). The values of these Elf constants were
selected from OS-specific ranges according to the definitions from glibc.
Livepatch relocation sections are marked with SHF_RELA_LIVEPATCH to
indicate to the module loader that it should not apply that relocation
section and that livepatch will handle them.
The SHN_LIVEPATCH shndx marks symbols that will be resolved by livepatch.
The module loader ignores these symbols and does not attempt to resolve
them.
Signed-off-by: Jessica Yu <jeyu@...hat.com>
---
include/uapi/linux/elf.h | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 71e1d0e..cb4a72f 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -282,16 +282,18 @@ typedef struct elf64_phdr {
#define SHT_HIUSER 0xffffffff
/* sh_flags */
-#define SHF_WRITE 0x1
-#define SHF_ALLOC 0x2
-#define SHF_EXECINSTR 0x4
-#define SHF_MASKPROC 0xf0000000
+#define SHF_WRITE 0x1
+#define SHF_ALLOC 0x2
+#define SHF_EXECINSTR 0x4
+#define SHF_RELA_LIVEPATCH 0x00100000
+#define SHF_MASKPROC 0xf0000000
/* special section indexes */
#define SHN_UNDEF 0
#define SHN_LORESERVE 0xff00
#define SHN_LOPROC 0xff00
#define SHN_HIPROC 0xff1f
+#define SHN_LIVEPATCH 0xff20
#define SHN_ABS 0xfff1
#define SHN_COMMON 0xfff2
#define SHN_HIRESERVE 0xffff
--
2.4.3
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