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Subject[PATCH v11 17/19] kernel: add support for .init_array.* constructors
Date
KASan uses constructors for initializing redzones for global
variables. Globals instrumentation in GCC 4.9.2 produces
constructors with priority (.init_array.00099)

Currently kernel ignores such constructors. Only constructors
with default priority supported (.init_array)

This patch adds support for constructors with priorities.
For kernel image we put pointers to constructors between
__ctors_start/__ctors_end and do_ctors() will call them
on start up.
For modules we merge .init_array.* sections into resulting .init_array.
Module code properly handles constructors in .init_array section.

Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
---
include/asm-generic/vmlinux.lds.h | 1 +
scripts/module-common.lds | 3 +++
2 files changed, 4 insertions(+)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index bee5d68..ac78910 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -478,6 +478,7 @@
#define KERNEL_CTORS() . = ALIGN(8); \
VMLINUX_SYMBOL(__ctors_start) = .; \
*(.ctors) \
+ *(SORT(.init_array.*)) \
*(.init_array) \
VMLINUX_SYMBOL(__ctors_end) = .;
#else
diff --git a/scripts/module-common.lds b/scripts/module-common.lds
index 0865b3e..01c5849 100644
--- a/scripts/module-common.lds
+++ b/scripts/module-common.lds
@@ -16,4 +16,7 @@ SECTIONS {
__kcrctab_unused : { *(SORT(___kcrctab_unused+*)) }
__kcrctab_unused_gpl : { *(SORT(___kcrctab_unused_gpl+*)) }
__kcrctab_gpl_future : { *(SORT(___kcrctab_gpl_future+*)) }
+
+ . = ALIGN(8);
+ .init_array : { *(SORT(.init_array.*)) *(.init_array) }
}
--
2.2.2


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