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https://github.com/Mathewnd/Astral.git
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Matheus
e4a4896b4b
Implement a device (/dev/kcov) that exposes coverage info for the kernel. This will be especially useful for coverage-based fuzzing (e.g. syzkaller). Exclude a lot of functions which would crash/otherwise interfere in the coverage, including only processing coverage callbacks when not handling an irq.
44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
#ifndef _KCOV_H
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#define _KCOV_H
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#include <stdint.h>
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#include <stddef.h>
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#include <mutex.h>
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#ifdef KCOV_ENABLED
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#define KCOV_DISABLED __attribute__((no_sanitize_coverage))
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#else
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#define KCOV_DISABLED
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#endif
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#define KCOV_MODE_DISABLED 0
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#define KCOV_MODE_PC 1
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#define KCOV_MODE_CMP 2
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#define KCOV_CMP_FLAGS_CONST 1
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#define KCOV_CMP_FLAGS_8BIT 0
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#define KCOV_CMP_FLAGS_16BIT 2
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#define KCOV_CMP_FLAGS_32BIT 4
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#define KCOV_CMP_FLAGS_64BIT 6
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typedef struct {
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unsigned int mode;
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mutex_t mapping_mutex;
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unsigned int entry_count; // protected by mutex
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uint64_t *buffer; // pointer protected by mutex
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size_t mappings; // protected by mutex
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unsigned int refcount;
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unsigned int minor;
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void *vnode_handle;
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} kcov_t;
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void kcov_publish_pc(uint64_t pc);
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void kcov_publish_cmp(uint64_t pc, uint64_t v1, uint64_t v2, uint64_t flags);
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int kcov_set_buffer_size(unsigned int entry_count);
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int kcov_set_mode(unsigned int mode);
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void kcov_hold(kcov_t *kcov);
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void kcov_release(kcov_t *kcov);
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void kcov_free_buffer(kcov_t *kcov);
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#endif
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