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 extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie@xxxxxxxxxx>
---
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 e549bff87c5b..a2301c292e26 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -279,6 +279,17 @@
VMLINUX_SYMBOL(__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
*/
@@ -335,6 +346,7 @@
VMLINUX_SYMBOL(__end_builtin_fw) = .; \
} \
\
+ RO_GOT_X86 \
TRACEDATA \
\
/* Kernel symbol table: Normal symbols */ \
--
2.15.0.rc0.271.g36b669edcc-goog
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