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//===-- sanitizer_procmaps_solaris.cpp ------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Information about the process mappings (Solaris-specific parts).
//===----------------------------------------------------------------------===//
// Before Solaris 11.4, <procfs.h> doesn't work in a largefile environment.
#undef _FILE_OFFSET_BITS
#include "sanitizer_platform.h"
#if SANITIZER_SOLARIS
# include <fcntl.h>
# include <limits.h>
# include <procfs.h>
# include "sanitizer_common.h"
# include "sanitizer_procmaps.h"
namespace __sanitizer {
void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
uptr fd = internal_open("/proc/self/xmap", O_RDONLY);
CHECK_NE(fd, -1);
uptr Size = internal_filesize(fd);
CHECK_GT(Size, 0);
// Allow for additional entries by following mmap.
size_t MmapedSize = Size * 4 / 3;
void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
Size = internal_read(fd, VmMap, MmapedSize);
CHECK_NE(Size, -1);
internal_close(fd);
proc_maps->data = (char *)VmMap;
proc_maps->mmaped_size = MmapedSize;
proc_maps->len = Size;
}
bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
if (Error()) return false; // simulate empty maps
char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
if (data_.current >= last) return false;
prxmap_t *xmapentry =
const_cast<prxmap_t *>(reinterpret_cast<const prxmap_t *>(data_.current));
segment->start = (uptr)xmapentry->pr_vaddr;
segment->end = (uptr)(xmapentry->pr_vaddr + xmapentry->pr_size);
segment->offset = (uptr)xmapentry->pr_offset;
segment->protection = 0;
if ((xmapentry->pr_mflags & MA_READ) != 0)
segment->protection |= kProtectionRead;
if ((xmapentry->pr_mflags & MA_WRITE) != 0)
segment->protection |= kProtectionWrite;
if ((xmapentry->pr_mflags & MA_EXEC) != 0)
segment->protection |= kProtectionExecute;
if ((xmapentry->pr_mflags & MA_SHARED) != 0)
segment->protection |= kProtectionShared;
if (segment->filename != NULL && segment->filename_size > 0) {
char proc_path[PATH_MAX + 1];
// Avoid unnecessary readlink on unnamed entires.
if (xmapentry->pr_mapname[0] == '\0')
segment->filename[0] = '\0';
else {
internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s",
xmapentry->pr_mapname);
ssize_t sz = internal_readlink(proc_path, segment->filename,
segment->filename_size - 1);
// If readlink failed, the map is anonymous.
if (sz == -1)
segment->filename[0] = '\0';
else if ((size_t)sz < segment->filename_size)
// readlink doesn't NUL-terminate.
segment->filename[sz] = '\0';
}
}
data_.current += sizeof(prxmap_t);
return true;
}
} // namespace __sanitizer
#endif // SANITIZER_SOLARIS
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