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28aad1c290
CONFIG_CFI_CLANG_SHADOW assumes the __cfi_check() function is page aligned and at the beginning of the .text section. While Clang would normally align the function correctly, it fails to do so for modules with no executable code. This change ensures the correct __cfi_check() location and alignment. It also discards the .eh_frame section, which Clang can generate with certain sanitizers, such as CFI. Link: https://bugs.llvm.org/show_bug.cgi?id=46293 Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Jessica Yu <jeyu@kernel.org> Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20210408182843.1754385-5-samitolvanen@google.com
67 lines
1.5 KiB
ArmAsm
67 lines
1.5 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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#ifdef CONFIG_CFI_CLANG
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# include <asm/page.h>
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# define ALIGN_CFI ALIGN(PAGE_SIZE)
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# define SANITIZER_DISCARDS *(.eh_frame)
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#else
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# define ALIGN_CFI
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# define SANITIZER_DISCARDS
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#endif
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SECTIONS {
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/DISCARD/ : {
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*(.discard)
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*(.discard.*)
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SANITIZER_DISCARDS
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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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.init_array 0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) }
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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_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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/*
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* With CONFIG_CFI_CLANG, we assume __cfi_check is at the beginning
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* of the .text section, and is aligned to PAGE_SIZE.
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*/
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.text : ALIGN_CFI {
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*(.text.__cfi_check)
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*(.text .text.[0-9a-zA-Z_]* .text..L.cfi*)
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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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