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381a38ea53
While __noinstr already contained __no_sanitize_coverage, it needs to
be added to __init and __head section markings to support the Clang
implementation of CONFIG_KSTACK_ERASE. This is to make sure the stack
depth tracking callback is not executed in unsupported contexts.
The other sanitizer coverage options (trace-pc and trace-cmp) aren't
needed in __head nor __init either ("We are interested in code coverage
as a function of a syscall inputs"[1]), so this is fine to disable for
them as well.
Link: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/kcov.c?h=v6.14#n179 [1]
Acked-by: Marco Elver <elver@google.com>
Link: https://lore.kernel.org/r/20250724055029.3623499-3-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
27 lines
1.0 KiB
C
27 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_INIT_H
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#define _ASM_X86_INIT_H
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#if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 170000
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#define __head __section(".head.text") __no_sanitize_undefined __no_stack_protector
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#else
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#define __head __section(".head.text") __no_sanitize_undefined __no_sanitize_coverage
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#endif
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struct x86_mapping_info {
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void *(*alloc_pgt_page)(void *); /* allocate buf for page table */
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void (*free_pgt_page)(void *, void *); /* free buf for page table */
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void *context; /* context for alloc_pgt_page */
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unsigned long page_flag; /* page flag for PMD or PUD entry */
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unsigned long offset; /* ident mapping offset */
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bool direct_gbpages; /* PUD level 1GB page support */
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unsigned long kernpg_flag; /* kernel pagetable flag override */
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};
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int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
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unsigned long pstart, unsigned long pend);
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void kernel_ident_mapping_free(struct x86_mapping_info *info, pgd_t *pgd);
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#endif /* _ASM_X86_INIT_H */
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