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8924560094
Switch from Clang's original forward-edge control-flow integrity implementation to -fsanitize=kcfi, which is better suited for the kernel, as it doesn't require LTO, doesn't use a jump table that requires altering function references, and won't break cross-module function address equality. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Tested-by: Kees Cook <keescook@chromium.org> Tested-by: Nathan Chancellor <nathan@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220908215504.3686827-6-samitolvanen@google.com
54 lines
1.3 KiB
ArmAsm
54 lines
1.3 KiB
ArmAsm
/*
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* Common module linker script, always used when linking a module.
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* Archs are free to supply their own linker scripts. ld will
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* combine them automatically.
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*/
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SECTIONS {
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/DISCARD/ : {
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*(.discard)
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*(.discard.*)
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}
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__ksymtab 0 : { *(SORT(___ksymtab+*)) }
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__ksymtab_gpl 0 : { *(SORT(___ksymtab_gpl+*)) }
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__kcrctab 0 : { *(SORT(___kcrctab+*)) }
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__kcrctab_gpl 0 : { *(SORT(___kcrctab_gpl+*)) }
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.ctors 0 : ALIGN(8) { *(SORT(.ctors.*)) *(.ctors) }
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.init_array 0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) }
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.altinstructions 0 : ALIGN(8) { KEEP(*(.altinstructions)) }
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__bug_table 0 : ALIGN(8) { KEEP(*(__bug_table)) }
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__jump_table 0 : ALIGN(8) { KEEP(*(__jump_table)) }
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__patchable_function_entries : { *(__patchable_function_entries) }
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#ifdef CONFIG_ARCH_USES_CFI_TRAPS
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__kcfi_traps : { KEEP(*(.kcfi_traps)) }
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#endif
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#ifdef CONFIG_LTO_CLANG
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/*
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* With CONFIG_LTO_CLANG, LLD always enables -fdata-sections and
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* -ffunction-sections, which increases the size of the final module.
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* Merge the split sections in the final binary.
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*/
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.bss : {
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*(.bss .bss.[0-9a-zA-Z_]*)
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*(.bss..L*)
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}
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.data : {
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*(.data .data.[0-9a-zA-Z_]*)
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*(.data..L*)
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}
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.rodata : {
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*(.rodata .rodata.[0-9a-zA-Z_]*)
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*(.rodata..L*)
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}
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#endif
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}
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/* bring in arch-specific sections */
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#include <asm/module.lds.h>
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