b667dd7017
2019-08-14 Martin Liska <mliska@suse.cz> PR sanitizer/89832 PR sanitizer/91325 * All source files: Merge from upstream 368656. From-SVN: r274426
140 lines
3.8 KiB
C++
140 lines
3.8 KiB
C++
//===-- sanitizer_procmaps_bsd.cpp ----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Information about the process mappings
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// (FreeBSD, OpenBSD and NetBSD-specific parts).
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD
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#include "sanitizer_common.h"
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#if SANITIZER_FREEBSD
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#include "sanitizer_freebsd.h"
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#endif
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#include "sanitizer_procmaps.h"
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// clang-format off
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#include <sys/types.h>
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#include <sys/sysctl.h>
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// clang-format on
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#include <unistd.h>
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#if SANITIZER_FREEBSD
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#include <sys/user.h>
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#endif
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#include <limits.h>
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#if SANITIZER_OPENBSD
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#define KVME_PROT_READ KVE_PROT_READ
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#define KVME_PROT_WRITE KVE_PROT_WRITE
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#define KVME_PROT_EXEC KVE_PROT_EXEC
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#endif
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// Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
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#if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
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#include <osreldate.h>
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#if __FreeBSD_version <= 902001 // v9.2
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#define kinfo_vmentry xkinfo_vmentry
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#endif
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#endif
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namespace __sanitizer {
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void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
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const int Mib[] = {
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#if SANITIZER_FREEBSD
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CTL_KERN,
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KERN_PROC,
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KERN_PROC_VMMAP,
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getpid()
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#elif SANITIZER_OPENBSD
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CTL_KERN,
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KERN_PROC_VMMAP,
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getpid()
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#elif SANITIZER_NETBSD
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CTL_VM,
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VM_PROC,
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VM_PROC_MAP,
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getpid(),
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sizeof(struct kinfo_vmentry)
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#else
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#error "not supported"
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#endif
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};
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uptr Size = 0;
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int Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), NULL, &Size, NULL, 0);
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CHECK_EQ(Err, 0);
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CHECK_GT(Size, 0);
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#if !SANITIZER_OPENBSD
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size_t MmapedSize = Size * 4 / 3;
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void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
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Size = MmapedSize;
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Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), VmMap, &Size, NULL, 0);
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CHECK_EQ(Err, 0);
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proc_maps->data = (char *)VmMap;
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#else
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size_t PageSize = GetPageSize();
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size_t MmapedSize = Size;
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MmapedSize = ((MmapedSize - 1) / PageSize + 1) * PageSize;
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char *Mem = (char *)MmapOrDie(MmapedSize, "ReadProcMaps()");
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Size = 2 * Size + 10 * sizeof(struct kinfo_vmentry);
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if (Size > 0x10000)
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Size = 0x10000;
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Size = (Size / sizeof(struct kinfo_vmentry)) * sizeof(struct kinfo_vmentry);
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Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), Mem, &Size, NULL, 0);
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CHECK_EQ(Err, 0);
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MmapedSize = Size;
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proc_maps->data = Mem;
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#endif
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proc_maps->mmaped_size = MmapedSize;
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proc_maps->len = Size;
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}
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bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
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CHECK(!Error()); // can not fail
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char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
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if (data_.current >= last)
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return false;
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const struct kinfo_vmentry *VmEntry =
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(const struct kinfo_vmentry *)data_.current;
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segment->start = (uptr)VmEntry->kve_start;
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segment->end = (uptr)VmEntry->kve_end;
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segment->offset = (uptr)VmEntry->kve_offset;
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segment->protection = 0;
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if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
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segment->protection |= kProtectionRead;
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if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
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segment->protection |= kProtectionWrite;
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if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
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segment->protection |= kProtectionExecute;
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#if !SANITIZER_OPENBSD
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if (segment->filename != NULL && segment->filename_size > 0) {
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internal_snprintf(segment->filename,
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Min(segment->filename_size, (uptr)PATH_MAX), "%s",
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VmEntry->kve_path);
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}
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#endif
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#if SANITIZER_FREEBSD
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data_.current += VmEntry->kve_structsize;
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#else
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data_.current += sizeof(*VmEntry);
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#endif
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return true;
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}
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} // namespace __sanitizer
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#endif
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