llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_procmaps_common.cc

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//===-- sanitizer_procmaps_common.cc --------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Information about the process mappings (common parts).
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
[Sanitizers] Basic sanitizer Solaris support (PR 33274) Summary: This is the first mostly working version of the Sanitizer port to 32-bit Solaris/x86. It is currently based on Solaris 11.4 Beta. This part was initially developed inside libsanitizer in the GCC tree and should apply to both. Subsequent parts will address changes to clang, the compiler-rt build system and testsuite. I'm not yet sure what the right patch granularity is: if it's profitable to split the patch up, I'd like to get guidance on how to do so. Most of the changes are probably straightforward with a few exceptions: * The Solaris syscall interface isn't stable, undocumented and can change within an OS release. The stable interface is the libc interface, which I'm using here, if possible using the internal _-prefixed names. * While the patch primarily target 32-bit x86, I've left a few sparc changes in. They cannot currently be used with clang due to a backend limitation, but have worked fine inside the gcc tree. * Some functions (e.g. largefile versions of functions like open64) only exist in 32-bit Solaris, so I've introduced a separate SANITIZER_SOLARIS32 to check for that. The patch (with the subsequent ones to be submitted shortly) was tested on i386-pc-solaris2.11. Only a few failures remain, some of them analyzed, some still TBD: AddressSanitizer-i386-sunos :: TestCases/Posix/concurrent_overflow.cc AddressSanitizer-i386-sunos :: TestCases/init-order-atexit.cc AddressSanitizer-i386-sunos :: TestCases/log-path_test.cc AddressSanitizer-i386-sunos :: TestCases/malloc-no-intercept.c AddressSanitizer-i386-sunos-dynamic :: TestCases/Posix/concurrent_overflow.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/Posix/start-deactivated.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/default_options.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/init-order-atexit.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/log-path_test.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/malloc-no-intercept.c SanitizerCommon-Unit :: ./Sanitizer-i386-Test/MemoryMappingLayout.DumpListOfModules SanitizerCommon-Unit :: ./Sanitizer-i386-Test/SanitizerCommon.PthreadDestructorIterations Maybe this is good enough the get the ball rolling. Reviewers: kcc, alekseyshl Reviewed By: alekseyshl Subscribers: srhines, jyknight, kubamracek, krytarowski, fedor.sergeev, llvm-commits, #sanitizers Tags: #sanitizers Differential Revision: https://reviews.llvm.org/D40898 llvm-svn: 320740
2017-12-15 04:14:29 +08:00
#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
SANITIZER_SOLARIS
#include "sanitizer_common.h"
#include "sanitizer_placement_new.h"
#include "sanitizer_procmaps.h"
namespace __sanitizer {
static ProcSelfMapsBuff cached_proc_self_maps;
static StaticSpinMutex cache_lock;
static int TranslateDigit(char c) {
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return -1;
}
// Parse a number and promote 'p' up to the first non-digit character.
static uptr ParseNumber(const char **p, int base) {
uptr n = 0;
int d;
CHECK(base >= 2 && base <= 16);
while ((d = TranslateDigit(**p)) >= 0 && d < base) {
n = n * base + d;
(*p)++;
}
return n;
}
bool IsDecimal(char c) {
int d = TranslateDigit(c);
return d >= 0 && d < 10;
}
uptr ParseDecimal(const char **p) {
return ParseNumber(p, 10);
}
bool IsHex(char c) {
int d = TranslateDigit(c);
return d >= 0 && d < 16;
}
uptr ParseHex(const char **p) {
return ParseNumber(p, 16);
}
void MemoryMappedSegment::AddAddressRanges(LoadedModule *module) {
// data_ should be unused on this platform
CHECK(!data_);
module->addAddressRange(start, end, IsExecutable(), IsWritable());
}
MemoryMappingLayout::MemoryMappingLayout(bool cache_enabled) {
// FIXME: in the future we may want to cache the mappings on demand only.
if (cache_enabled)
CacheMemoryMappings();
// Read maps after the cache update to capture the maps/unmaps happening in
// the process of updating.
ReadProcMaps(&data_.proc_self_maps);
if (cache_enabled && data_.proc_self_maps.mmaped_size == 0)
LoadFromCache();
CHECK_GT(data_.proc_self_maps.mmaped_size, 0);
CHECK_GT(data_.proc_self_maps.len, 0);
Reset();
}
MemoryMappingLayout::~MemoryMappingLayout() {
// Only unmap the buffer if it is different from the cached one. Otherwise
// it will be unmapped when the cache is refreshed.
if (data_.proc_self_maps.data != cached_proc_self_maps.data)
UnmapOrDie(data_.proc_self_maps.data, data_.proc_self_maps.mmaped_size);
}
void MemoryMappingLayout::Reset() {
data_.current = data_.proc_self_maps.data;
}
// static
void MemoryMappingLayout::CacheMemoryMappings() {
ProcSelfMapsBuff new_proc_self_maps;
ReadProcMaps(&new_proc_self_maps);
// Don't invalidate the cache if the mappings are unavailable.
if (new_proc_self_maps.mmaped_size == 0)
return;
SpinMutexLock l(&cache_lock);
if (cached_proc_self_maps.mmaped_size)
UnmapOrDie(cached_proc_self_maps.data, cached_proc_self_maps.mmaped_size);
cached_proc_self_maps = new_proc_self_maps;
}
void MemoryMappingLayout::LoadFromCache() {
SpinMutexLock l(&cache_lock);
if (cached_proc_self_maps.data)
data_.proc_self_maps = cached_proc_self_maps;
}
void MemoryMappingLayout::DumpListOfModules(
InternalMmapVectorNoCtor<LoadedModule> *modules) {
Reset();
InternalScopedString module_name(kMaxPathLength);
MemoryMappedSegment segment(module_name.data(), module_name.size());
for (uptr i = 0; Next(&segment); i++) {
const char *cur_name = segment.filename;
if (cur_name[0] == '\0')
continue;
// Don't subtract 'cur_beg' from the first entry:
// * If a binary is compiled w/o -pie, then the first entry in
// process maps is likely the binary itself (all dynamic libs
// are mapped higher in address space). For such a binary,
// instruction offset in binary coincides with the actual
// instruction address in virtual memory (as code section
// is mapped to a fixed memory range).
// * If a binary is compiled with -pie, all the modules are
// mapped high at address space (in particular, higher than
// shadow memory of the tool), so the module can't be the
// first entry.
uptr base_address = (i ? segment.start : 0) - segment.offset;
LoadedModule cur_module;
cur_module.set(cur_name, base_address);
segment.AddAddressRanges(&cur_module);
modules->push_back(cur_module);
}
}
void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size) {
char *smaps = nullptr;
uptr smaps_cap = 0;
uptr smaps_len = 0;
if (!ReadFileToBuffer("/proc/self/smaps", &smaps, &smaps_cap, &smaps_len))
return;
uptr start = 0;
bool file = false;
const char *pos = smaps;
while (pos < smaps + smaps_len) {
if (IsHex(pos[0])) {
start = ParseHex(&pos);
for (; *pos != '/' && *pos > '\n'; pos++) {}
file = *pos == '/';
} else if (internal_strncmp(pos, "Rss:", 4) == 0) {
while (!IsDecimal(*pos)) pos++;
uptr rss = ParseDecimal(&pos) * 1024;
cb(start, rss, file, stats, stats_size);
}
while (*pos++ != '\n') {}
}
UnmapOrDie(smaps, smaps_cap);
}
} // namespace __sanitizer
[Sanitizers] Basic sanitizer Solaris support (PR 33274) Summary: This is the first mostly working version of the Sanitizer port to 32-bit Solaris/x86. It is currently based on Solaris 11.4 Beta. This part was initially developed inside libsanitizer in the GCC tree and should apply to both. Subsequent parts will address changes to clang, the compiler-rt build system and testsuite. I'm not yet sure what the right patch granularity is: if it's profitable to split the patch up, I'd like to get guidance on how to do so. Most of the changes are probably straightforward with a few exceptions: * The Solaris syscall interface isn't stable, undocumented and can change within an OS release. The stable interface is the libc interface, which I'm using here, if possible using the internal _-prefixed names. * While the patch primarily target 32-bit x86, I've left a few sparc changes in. They cannot currently be used with clang due to a backend limitation, but have worked fine inside the gcc tree. * Some functions (e.g. largefile versions of functions like open64) only exist in 32-bit Solaris, so I've introduced a separate SANITIZER_SOLARIS32 to check for that. The patch (with the subsequent ones to be submitted shortly) was tested on i386-pc-solaris2.11. Only a few failures remain, some of them analyzed, some still TBD: AddressSanitizer-i386-sunos :: TestCases/Posix/concurrent_overflow.cc AddressSanitizer-i386-sunos :: TestCases/init-order-atexit.cc AddressSanitizer-i386-sunos :: TestCases/log-path_test.cc AddressSanitizer-i386-sunos :: TestCases/malloc-no-intercept.c AddressSanitizer-i386-sunos-dynamic :: TestCases/Posix/concurrent_overflow.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/Posix/start-deactivated.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/default_options.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/init-order-atexit.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/log-path_test.cc AddressSanitizer-i386-sunos-dynamic :: TestCases/malloc-no-intercept.c SanitizerCommon-Unit :: ./Sanitizer-i386-Test/MemoryMappingLayout.DumpListOfModules SanitizerCommon-Unit :: ./Sanitizer-i386-Test/SanitizerCommon.PthreadDestructorIterations Maybe this is good enough the get the ball rolling. Reviewers: kcc, alekseyshl Reviewed By: alekseyshl Subscribers: srhines, jyknight, kubamracek, krytarowski, fedor.sergeev, llvm-commits, #sanitizers Tags: #sanitizers Differential Revision: https://reviews.llvm.org/D40898 llvm-svn: 320740
2017-12-15 04:14:29 +08:00
#endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD ||
// SANITIZER_SOLARIS