15fcf9af71
When running applications which make large (sparsely populated) address ranges (e.g. when using address sanitizer with LibAFL) the inability to exclude these regions from any core dump can result in very large files which fill the disk. A coredump is obvously very useful for performing a post-mortem when fuzzing. Whilst the man pages state that madvise provides only a hint (and hence can be ignored), this patch adds support to handle MADV_DONTDUMP and set a corresponding flag in the page flags, thus allowing QEMU to exclude these regions from the core file.
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* QEMU page protection definitions.
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* SPDX-License-Identifier: LGPL-2.1+
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*/
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#ifndef EXEC_PAGE_PROT_COMMON_H
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#define EXEC_PAGE_PROT_COMMON_H
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/* same as PROT_xxx */
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#define PAGE_READ 0x0001
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#define PAGE_WRITE 0x0002
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#define PAGE_EXEC 0x0004
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#define PAGE_RWX (PAGE_READ | PAGE_WRITE | PAGE_EXEC)
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#define PAGE_VALID 0x0008
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/*
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* Original state of the write flag (used when tracking self-modifying code)
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*/
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#define PAGE_WRITE_ORG 0x0010
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/*
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* Invalidate the TLB entry immediately, helpful for s390x
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* Low-Address-Protection. Used with PAGE_WRITE in tlb_set_page_with_attrs()
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*/
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#define PAGE_WRITE_INV 0x0020
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/* For use with page_set_flags: page is being replaced; target_data cleared. */
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#define PAGE_RESET 0x0040
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/* For linux-user, indicates that the page is MAP_ANON. */
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#define PAGE_ANON 0x0080
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/* Target-specific bits that will be used via page_get_flags(). */
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#define PAGE_TARGET_1 0x0200
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#define PAGE_TARGET_2 0x0400
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/*
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* For linux-user, indicates that the page is mapped with the same semantics
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* in both guest and host.
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*/
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#define PAGE_PASSTHROUGH 0x0800
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/*
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* For linux-user, indicates that the page should not be included in a core
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* dump.
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*/
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#define PAGE_DONTDUMP 0x1000
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#ifdef CONFIG_USER_ONLY
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void TSA_NO_TSA mmap_lock(void);
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void TSA_NO_TSA mmap_unlock(void);
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bool have_mmap_lock(void);
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static inline void mmap_unlock_guard(void *unused)
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{
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mmap_unlock();
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}
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#define WITH_MMAP_LOCK_GUARD() \
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for (int _mmap_lock_iter __attribute__((cleanup(mmap_unlock_guard))) \
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= (mmap_lock(), 0); _mmap_lock_iter == 0; _mmap_lock_iter = 1)
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#else
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static inline void mmap_lock(void) {}
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static inline void mmap_unlock(void) {}
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#define WITH_MMAP_LOCK_GUARD()
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#endif /* !CONFIG_USER_ONLY */
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#endif
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