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Message-Id: <20180529221625.33541-25-thgarnie@google.com>
Date: Tue, 29 May 2018 15:15:25 -0700
From: Thomas Garnier <thgarnie@...gle.com>
To: kernel-hardening@...ts.openwall.com
Cc: Thomas Garnier <thgarnie@...gle.com>,
Arnd Bergmann <arnd@...db.de>,
linux-arch@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 24/27] x86/mm: Make the x86 GOT read-only
The GOT is changed during early boot when relocations are applied. Make
it read-only directly. This table exists only for PIE binary.
Position Independent Executable (PIE) support will allow to extend the
KASLR randomization range 0xffffffff80000000.
Signed-off-by: Thomas Garnier <thgarnie@...gle.com>
---
include/asm-generic/vmlinux.lds.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index e373e2e10f6a..e5b0710fe693 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -314,6 +314,17 @@
__end_ro_after_init = .;
#endif
+#ifdef CONFIG_X86_PIE
+#define RO_GOT_X86 \
+ .got : AT(ADDR(.got) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start_got) = .; \
+ *(.got); \
+ VMLINUX_SYMBOL(__end_got) = .; \
+ }
+#else
+#define RO_GOT_X86
+#endif
+
/*
* Read only Data
*/
@@ -370,6 +381,7 @@
__end_builtin_fw = .; \
} \
\
+ RO_GOT_X86 \
TRACEDATA \
\
/* Kernel symbol table: Normal symbols */ \
--
2.17.0.921.gf22659ad46-goog
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