mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-01 06:33:07 +00:00
34eb62d868
because the heuristics that various linkers & compilers use to handle them (include these bits into the output image vs discarding them silently) are both highly idiosyncratic and also version dependent. Instead of this historically problematic mess, this tree by Kees Cook (et al) adds build time asserts and build time warnings if there's any orphan section in the kernel or if a section is not sized as expected. And because we relied on so many silent assumptions in this area, fix a metric ton of dependencies and some outright bugs related to this, before we can finally enable the checks on the x86, ARM and ARM64 platforms. Signed-off-by: Ingo Molnar <mingo@kernel.org> -----BEGIN PGP SIGNATURE----- iQJFBAABCgAvFiEEBpT5eoXrXCwVQwEKEnMQ0APhK1gFAl+Edv4RHG1pbmdvQGtl cm5lbC5vcmcACgkQEnMQ0APhK1hiKBAApdJEOaK7hMc3013DYNctklIxEPJL2mFJ 11YJRIh4pUJTF0TE+EHT/D+rSIuRsyuoSmOQBQ61/wVSnyG067GjjVJRqh/eYaJ1 fDhJi2FuHOjXl+CiN0KxzBjjp+V4NhF7jHT59tpQSvfZeg7FjteoxfztxaCp5ek3 S3wHB3CC4c4jE3lfjHem1E9/PwT4kwPYx1c3gAUdEqJdjkihjX9fWusfjLeqW6/d Y5VkApi6bL9XiZUZj5l0dEIweLJJ86+PkKJqpo3spxxEak1LSn1MEix+lcJ8e1Kg sb/bEEivDcmFlFWOJnn0QLquCR0Cx5bz1pwsL0tuf0yAd4+sXX5IMuGUysZlEdKM BHL9h5HbevGF4BScwZwZH7lyEg7q67s5KnRu4hxy0Swfcj7y0oT/9lXqpbpZ2DqO Hd+bRRQKIbqnTMp0hcit9LfpLp93vj0dBlaV5ocAJJlu62u9VnwGG5HQuZ5giLUr kA1SLw63Y1wopFRxgFyER8les7eLsu0zxHeK44rRVlVnfI99OMTOgVNicmDFy3Fm AfcnfJG0BqBEJGQz5es34uQQKKBwFPtC9NztopI62KiwOspYYZyrO1BNxdOc6DlS mIHrmO89HMXuid5eolvLaFqUWirHoWO8TlycgZxUWVHc2txVPjAEU/axouU/dSSU w/6GpzAa+7g= =fXAw -----END PGP SIGNATURE----- Merge tag 'core-build-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull orphan section checking from Ingo Molnar: "Orphan link sections were a long-standing source of obscure bugs, because the heuristics that various linkers & compilers use to handle them (include these bits into the output image vs discarding them silently) are both highly idiosyncratic and also version dependent. Instead of this historically problematic mess, this tree by Kees Cook (et al) adds build time asserts and build time warnings if there's any orphan section in the kernel or if a section is not sized as expected. And because we relied on so many silent assumptions in this area, fix a metric ton of dependencies and some outright bugs related to this, before we can finally enable the checks on the x86, ARM and ARM64 platforms" * tag 'core-build-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (36 commits) x86/boot/compressed: Warn on orphan section placement x86/build: Warn on orphan section placement arm/boot: Warn on orphan section placement arm/build: Warn on orphan section placement arm64/build: Warn on orphan section placement x86/boot/compressed: Add missing debugging sections to output x86/boot/compressed: Remove, discard, or assert for unwanted sections x86/boot/compressed: Reorganize zero-size section asserts x86/build: Add asserts for unwanted sections x86/build: Enforce an empty .got.plt section x86/asm: Avoid generating unused kprobe sections arm/boot: Handle all sections explicitly arm/build: Assert for unwanted sections arm/build: Add missing sections arm/build: Explicitly keep .ARM.attributes sections arm/build: Refactor linker script headers arm64/build: Assert for unwanted sections arm64/build: Add missing DWARF sections arm64/build: Use common DISCARDS in linker script arm64/build: Remove .eh_frame* sections due to unwind tables ...
188 lines
4.7 KiB
C
188 lines
4.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_ASM_H
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#define _ASM_X86_ASM_H
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#ifdef __ASSEMBLY__
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# define __ASM_FORM(x) x
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# define __ASM_FORM_RAW(x) x
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# define __ASM_FORM_COMMA(x) x,
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#else
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#include <linux/stringify.h>
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# define __ASM_FORM(x) " " __stringify(x) " "
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# define __ASM_FORM_RAW(x) __stringify(x)
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# define __ASM_FORM_COMMA(x) " " __stringify(x) ","
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#endif
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#ifndef __x86_64__
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/* 32 bit */
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# define __ASM_SEL(a,b) __ASM_FORM(a)
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# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
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#else
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/* 64 bit */
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# define __ASM_SEL(a,b) __ASM_FORM(b)
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# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
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#endif
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#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \
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inst##q##__VA_ARGS__)
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#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg)
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#define _ASM_PTR __ASM_SEL(.long, .quad)
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#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
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#define _ASM_MOV __ASM_SIZE(mov)
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#define _ASM_INC __ASM_SIZE(inc)
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#define _ASM_DEC __ASM_SIZE(dec)
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#define _ASM_ADD __ASM_SIZE(add)
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#define _ASM_SUB __ASM_SIZE(sub)
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#define _ASM_XADD __ASM_SIZE(xadd)
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#define _ASM_MUL __ASM_SIZE(mul)
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#define _ASM_AX __ASM_REG(ax)
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#define _ASM_BX __ASM_REG(bx)
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#define _ASM_CX __ASM_REG(cx)
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#define _ASM_DX __ASM_REG(dx)
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#define _ASM_SP __ASM_REG(sp)
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#define _ASM_BP __ASM_REG(bp)
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#define _ASM_SI __ASM_REG(si)
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#define _ASM_DI __ASM_REG(di)
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#ifndef __x86_64__
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/* 32 bit */
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#define _ASM_ARG1 _ASM_AX
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#define _ASM_ARG2 _ASM_DX
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#define _ASM_ARG3 _ASM_CX
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#define _ASM_ARG1L eax
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#define _ASM_ARG2L edx
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#define _ASM_ARG3L ecx
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#define _ASM_ARG1W ax
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#define _ASM_ARG2W dx
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#define _ASM_ARG3W cx
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#define _ASM_ARG1B al
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#define _ASM_ARG2B dl
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#define _ASM_ARG3B cl
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#else
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/* 64 bit */
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#define _ASM_ARG1 _ASM_DI
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#define _ASM_ARG2 _ASM_SI
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#define _ASM_ARG3 _ASM_DX
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#define _ASM_ARG4 _ASM_CX
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#define _ASM_ARG5 r8
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#define _ASM_ARG6 r9
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#define _ASM_ARG1Q rdi
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#define _ASM_ARG2Q rsi
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#define _ASM_ARG3Q rdx
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#define _ASM_ARG4Q rcx
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#define _ASM_ARG5Q r8
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#define _ASM_ARG6Q r9
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#define _ASM_ARG1L edi
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#define _ASM_ARG2L esi
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#define _ASM_ARG3L edx
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#define _ASM_ARG4L ecx
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#define _ASM_ARG5L r8d
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#define _ASM_ARG6L r9d
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#define _ASM_ARG1W di
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#define _ASM_ARG2W si
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#define _ASM_ARG3W dx
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#define _ASM_ARG4W cx
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#define _ASM_ARG5W r8w
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#define _ASM_ARG6W r9w
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#define _ASM_ARG1B dil
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#define _ASM_ARG2B sil
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#define _ASM_ARG3B dl
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#define _ASM_ARG4B cl
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#define _ASM_ARG5B r8b
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#define _ASM_ARG6B r9b
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#endif
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/*
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* Macros to generate condition code outputs from inline assembly,
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* The output operand must be type "bool".
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*/
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#ifdef __GCC_ASM_FLAG_OUTPUTS__
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# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
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# define CC_OUT(c) "=@cc" #c
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#else
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# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
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# define CC_OUT(c) [_cc_ ## c] "=qm"
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#endif
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/* Exception table entry */
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#ifdef __ASSEMBLY__
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# define _ASM_EXTABLE_HANDLE(from, to, handler) \
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.pushsection "__ex_table","a" ; \
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.balign 4 ; \
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.long (from) - . ; \
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.long (to) - . ; \
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.long (handler) - . ; \
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.popsection
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# define _ASM_EXTABLE(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
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# define _ASM_EXTABLE_UA(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
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# define _ASM_EXTABLE_CPY(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_copy)
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# define _ASM_EXTABLE_FAULT(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
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# ifdef CONFIG_KPROBES
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# define _ASM_NOKPROBE(entry) \
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.pushsection "_kprobe_blacklist","aw" ; \
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_ASM_ALIGN ; \
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_ASM_PTR (entry); \
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.popsection
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# else
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# define _ASM_NOKPROBE(entry)
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# endif
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#else /* ! __ASSEMBLY__ */
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# define _EXPAND_EXTABLE_HANDLE(x) #x
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# define _ASM_EXTABLE_HANDLE(from, to, handler) \
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" .pushsection \"__ex_table\",\"a\"\n" \
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" .balign 4\n" \
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" .long (" #from ") - .\n" \
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" .long (" #to ") - .\n" \
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" .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
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" .popsection\n"
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# define _ASM_EXTABLE(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
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# define _ASM_EXTABLE_UA(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
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# define _ASM_EXTABLE_CPY(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_copy)
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# define _ASM_EXTABLE_FAULT(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
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/* For C file, we already have NOKPROBE_SYMBOL macro */
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/*
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* This output constraint should be used for any inline asm which has a "call"
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* instruction. Otherwise the asm may be inserted before the frame pointer
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* gets set up by the containing function. If you forget to do this, objtool
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* may print a "call without frame pointer save/setup" warning.
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*/
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register unsigned long current_stack_pointer asm(_ASM_SP);
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#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_ASM_H */
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