| From | Andrey Ryabinin <> | Subject | [PATCH v11 17/19] kernel: add support for .init_array.* constructors | Date | Tue, 03 Feb 2015 20:43:10 +0300 |
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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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