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Reuse some checks

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This commit is contained in:
Antonio Andelic 2024-07-03 16:54:09 +02:00
parent cddd2312fb
commit 07f51e02ed
7 changed files with 297 additions and 530 deletions
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4
programs/CMakeLists.txt
View File

@ -73,9 +73,9 @@ else()
endif()
if (ENABLE_CLICKHOUSE_KEEPER)
message(STATUS "ClickHouse keeper mode: ON")
message(STATUS "ClickHouse Keeper: ON")
else()
message(STATUS "ClickHouse keeper mode: OFF")
message(STATUS "ClickHouse Keeper: OFF")
endif()
if (ENABLE_CLICKHOUSE_KEEPER_CLIENT)

266
programs/keeper/keeper_main.cpp
View File

@ -1,11 +1,9 @@
#include <csignal>
#include <unistd.h>
#include <fcntl.h>
#include <new>
#include <iostream>
#include <vector>
#include <tuple>
#include <string_view>
#include <utility> /// pair
@ -14,6 +12,9 @@
#include "config.h"
#include "config_tools.h"
#include <Common/EnvironmentChecks.h>
#include <Common/Coverage.h>
#include <Common/StringUtils.h>
#include <Common/getHashOfLoadedBinary.h>
#include <Common/IO.h>
@ -59,270 +60,9 @@ int printHelp(int, char **)
return -1;
}
enum class InstructionFail : uint8_t
{
NONE = 0,
SSE3 = 1,
SSSE3 = 2,
SSE4_1 = 3,
SSE4_2 = 4,
POPCNT = 5,
AVX = 6,
AVX2 = 7,
AVX512 = 8
};
auto instructionFailToString(InstructionFail fail)
{
switch (fail)
{
#define ret(x) return std::make_tuple(STDERR_FILENO, x, sizeof(x) - 1)
case InstructionFail::NONE:
ret("NONE");
case InstructionFail::SSE3:
ret("SSE3");
case InstructionFail::SSSE3:
ret("SSSE3");
case InstructionFail::SSE4_1:
ret("SSE4.1");
case InstructionFail::SSE4_2:
ret("SSE4.2");
case InstructionFail::POPCNT:
ret("POPCNT");
case InstructionFail::AVX:
ret("AVX");
case InstructionFail::AVX2:
ret("AVX2");
case InstructionFail::AVX512:
ret("AVX512");
#undef ret
}
}
sigjmp_buf jmpbuf;
[[noreturn]] void sigIllCheckHandler(int, siginfo_t *, void *)
{
siglongjmp(jmpbuf, 1);
}
/// Check if necessary SSE extensions are available by trying to execute some sse instructions.
/// If instruction is unavailable, SIGILL will be sent by kernel.
void checkRequiredInstructionsImpl(volatile InstructionFail & fail)
{
#if defined(__SSE3__)
fail = InstructionFail::SSE3;
__asm__ volatile ("addsubpd %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSSE3__)
fail = InstructionFail::SSSE3;
__asm__ volatile ("pabsw %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSE4_1__)
fail = InstructionFail::SSE4_1;
__asm__ volatile ("pmaxud %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSE4_2__)
fail = InstructionFail::SSE4_2;
__asm__ volatile ("pcmpgtq %%xmm0, %%xmm0" : : : "xmm0");
#endif
/// Defined by -msse4.2
#if defined(__POPCNT__)
fail = InstructionFail::POPCNT;
{
uint64_t a = 0;
uint64_t b = 0;
__asm__ volatile ("popcnt %1, %0" : "=r"(a) :"r"(b) :);
}
#endif
#if defined(__AVX__)
fail = InstructionFail::AVX;
__asm__ volatile ("vaddpd %%ymm0, %%ymm0, %%ymm0" : : : "ymm0");
#endif
#if defined(__AVX2__)
fail = InstructionFail::AVX2;
__asm__ volatile ("vpabsw %%ymm0, %%ymm0" : : : "ymm0");
#endif
#if defined(__AVX512__)
fail = InstructionFail::AVX512;
__asm__ volatile ("vpabsw %%zmm0, %%zmm0" : : : "zmm0");
#endif
fail = InstructionFail::NONE;
}
/// Macros to avoid using strlen(), since it may fail if SSE is not supported.
#define writeError(data) do \
{ \
static_assert(__builtin_constant_p(data)); \
if (!writeRetry(STDERR_FILENO, data, sizeof(data) - 1)) \
_Exit(1); \
} while (false)
/// Check SSE and others instructions availability. Calls exit on fail.
/// This function must be called as early as possible, even before main, because static initializers may use unavailable instructions.
void checkRequiredInstructions()
{
struct sigaction sa{};
struct sigaction sa_old{};
sa.sa_sigaction = sigIllCheckHandler;
sa.sa_flags = SA_SIGINFO;
auto signal = SIGILL;
if (sigemptyset(&sa.sa_mask) != 0
|| sigaddset(&sa.sa_mask, signal) != 0
|| sigaction(signal, &sa, &sa_old) != 0)
{
/// You may wonder about strlen.
/// Typical implementation of strlen is using SSE4.2 or AVX2.
/// But this is not the case because it's compiler builtin and is executed at compile time.
writeError("Can not set signal handler\n");
_Exit(1);
}
volatile InstructionFail fail = InstructionFail::NONE;
if (sigsetjmp(jmpbuf, 1))
{
writeError("Instruction check fail. The CPU does not support ");
if (!std::apply(writeRetry, instructionFailToString(fail)))
_Exit(1);
writeError(" instruction set.\n");
_Exit(1);
}
checkRequiredInstructionsImpl(fail);
if (sigaction(signal, &sa_old, nullptr))
{
writeError("Can not set signal handler\n");
_Exit(1);
}
}
struct Checker
{
Checker()
{
checkRequiredInstructions();
}
} checker
#ifndef OS_DARWIN
__attribute__((init_priority(101))) /// Run before other static initializers.
#endif
;
#if !defined(USE_MUSL)
/// NOTE: We will migrate to full static linking or our own dynamic loader to make this code obsolete.
void checkHarmfulEnvironmentVariables(char ** argv)
{
std::initializer_list<const char *> harmful_env_variables = {
/// The list is a selection from "man ld-linux".
"LD_PRELOAD",
"LD_LIBRARY_PATH",
"LD_ORIGIN_PATH",
"LD_AUDIT",
"LD_DYNAMIC_WEAK",
/// The list is a selection from "man dyld" (osx).
"DYLD_LIBRARY_PATH",
"DYLD_FALLBACK_LIBRARY_PATH",
"DYLD_VERSIONED_LIBRARY_PATH",
"DYLD_INSERT_LIBRARIES",
};
bool require_reexec = false;
for (const auto * var : harmful_env_variables)
{
if (const char * value = getenv(var); value && value[0]) // NOLINT(concurrency-mt-unsafe)
{
/// NOTE: setenv() is used over unsetenv() since unsetenv() marked as harmful
if (setenv(var, "", true)) // NOLINT(concurrency-mt-unsafe) // this is safe if not called concurrently
{
fmt::print(stderr, "Cannot override {} environment variable", var);
_exit(1);
}
require_reexec = true;
}
}
if (require_reexec)
{
/// Use execvp() over execv() to search in PATH.
///
/// This should be safe, since:
/// - if argv[0] is relative path - it is OK
/// - if argv[0] has only basename, the it will search in PATH, like shell will do.
///
/// Also note, that this (search in PATH) because there is no easy and
/// portable way to get absolute path of argv[0].
/// - on linux there is /proc/self/exec and AT_EXECFN
/// - but on other OSes there is no such thing (especially on OSX).
///
/// And since static linking will be done someday anyway,
/// let's not pollute the code base with special cases.
int error = execvp(argv[0], argv);
_exit(error);
}
}
#endif
#if defined(SANITIZE_COVERAGE)
__attribute__((no_sanitize("coverage")))
void dumpCoverage()
{
/// A user can request to dump the coverage information into files at exit.
/// This is useful for non-server applications such as clickhouse-format or clickhouse-client,
/// that cannot introspect it with SQL functions at runtime.
/// The CLICKHOUSE_WRITE_COVERAGE environment variable defines a prefix for a filename 'prefix.pid'
/// containing the list of addresses of covered .
/// The format is even simpler than Clang's "sancov": an array of 64-bit addresses, native byte order, no header.
if (const char * coverage_filename_prefix = getenv("CLICKHOUSE_WRITE_COVERAGE")) // NOLINT(concurrency-mt-unsafe)
{
auto dump = [](const std::string & name, auto span)
{
/// Write only non-zeros.
std::vector<uintptr_t> data;
data.reserve(span.size());
for (auto addr : span)
if (addr)
data.push_back(addr);
int fd = ::open(name.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0400);
if (-1 == fd)
{
writeError("Cannot open a file to write the coverage data\n");
}
else
{
if (!writeRetry(fd, reinterpret_cast<const char *>(data.data()), data.size() * sizeof(data[0])))
writeError("Cannot write the coverage data to a file\n");
if (0 != ::close(fd))
writeError("Cannot close the file with coverage data\n");
}
};
dump(fmt::format("{}.{}", coverage_filename_prefix, getpid()), getCumulativeCoverage());
}
}
#endif
}
bool isClickhouseApp(std::string_view app_suffix, std::vector<char *> & argv)
{
/// Use app if the first arg 'app' is passed (the arg should be quietly removed)

268
programs/main.cpp
View File

@ -1,5 +1,3 @@
#include <csignal>
#include <csetjmp>
#include <unistd.h>
#include <fcntl.h>
@ -7,7 +5,6 @@
#include <iostream>
#include <vector>
#include <string>
#include <tuple>
#include <string_view>
#include <utility> /// pair
@ -16,6 +13,9 @@
#include "config.h"
#include "config_tools.h"
#include <Common/EnvironmentChecks.h>
#include <Common/Coverage.h>
#include <Common/StringUtils.h>
#include <Common/getHashOfLoadedBinary.h>
#include <Common/IO.h>
@ -119,268 +119,6 @@ std::pair<std::string_view, std::string_view> clickhouse_short_names[] =
{"chc", "client"},
};
enum class InstructionFail : uint8_t
{
NONE = 0,
SSE3 = 1,
SSSE3 = 2,
SSE4_1 = 3,
SSE4_2 = 4,
POPCNT = 5,
AVX = 6,
AVX2 = 7,
AVX512 = 8
};
auto instructionFailToString(InstructionFail fail)
{
switch (fail)
{
#define ret(x) return std::make_tuple(STDERR_FILENO, x, sizeof(x) - 1)
case InstructionFail::NONE:
ret("NONE");
case InstructionFail::SSE3:
ret("SSE3");
case InstructionFail::SSSE3:
ret("SSSE3");
case InstructionFail::SSE4_1:
ret("SSE4.1");
case InstructionFail::SSE4_2:
ret("SSE4.2");
case InstructionFail::POPCNT:
ret("POPCNT");
case InstructionFail::AVX:
ret("AVX");
case InstructionFail::AVX2:
ret("AVX2");
case InstructionFail::AVX512:
ret("AVX512");
#undef ret
}
}
sigjmp_buf jmpbuf;
[[noreturn]] void sigIllCheckHandler(int, siginfo_t *, void *)
{
siglongjmp(jmpbuf, 1);
}
/// Check if necessary SSE extensions are available by trying to execute some sse instructions.
/// If instruction is unavailable, SIGILL will be sent by kernel.
void checkRequiredInstructionsImpl(volatile InstructionFail & fail)
{
#if defined(__SSE3__)
fail = InstructionFail::SSE3;
__asm__ volatile ("addsubpd %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSSE3__)
fail = InstructionFail::SSSE3;
__asm__ volatile ("pabsw %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSE4_1__)
fail = InstructionFail::SSE4_1;
__asm__ volatile ("pmaxud %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSE4_2__)
fail = InstructionFail::SSE4_2;
__asm__ volatile ("pcmpgtq %%xmm0, %%xmm0" : : : "xmm0");
#endif
/// Defined by -msse4.2
#if defined(__POPCNT__)
fail = InstructionFail::POPCNT;
{
uint64_t a = 0;
uint64_t b = 0;
__asm__ volatile ("popcnt %1, %0" : "=r"(a) :"r"(b) :);
}
#endif
#if defined(__AVX__)
fail = InstructionFail::AVX;
__asm__ volatile ("vaddpd %%ymm0, %%ymm0, %%ymm0" : : : "ymm0");
#endif
#if defined(__AVX2__)
fail = InstructionFail::AVX2;
__asm__ volatile ("vpabsw %%ymm0, %%ymm0" : : : "ymm0");
#endif
#if defined(__AVX512__)
fail = InstructionFail::AVX512;
__asm__ volatile ("vpabsw %%zmm0, %%zmm0" : : : "zmm0");
#endif
fail = InstructionFail::NONE;
}
/// Macros to avoid using strlen(), since it may fail if SSE is not supported.
#define writeError(data) do \
{ \
static_assert(__builtin_constant_p(data)); \
if (!writeRetry(STDERR_FILENO, data, sizeof(data) - 1)) \
_Exit(1); \
} while (false)
/// Check SSE and others instructions availability. Calls exit on fail.
/// This function must be called as early as possible, even before main, because static initializers may use unavailable instructions.
void checkRequiredInstructions()
{
struct sigaction sa{};
struct sigaction sa_old{};
sa.sa_sigaction = sigIllCheckHandler;
sa.sa_flags = SA_SIGINFO;
auto signal = SIGILL;
if (sigemptyset(&sa.sa_mask) != 0
|| sigaddset(&sa.sa_mask, signal) != 0
|| sigaction(signal, &sa, &sa_old) != 0)
{
/// You may wonder about strlen.
/// Typical implementation of strlen is using SSE4.2 or AVX2.
/// But this is not the case because it's compiler builtin and is executed at compile time.
writeError("Can not set signal handler\n");
_Exit(1);
}
volatile InstructionFail fail = InstructionFail::NONE;
if (sigsetjmp(jmpbuf, 1))
{
writeError("Instruction check fail. The CPU does not support ");
if (!std::apply(writeRetry, instructionFailToString(fail)))
_Exit(1);
writeError(" instruction set.\n");
_Exit(1);
}
checkRequiredInstructionsImpl(fail);
if (sigaction(signal, &sa_old, nullptr))
{
writeError("Can not set signal handler\n");
_Exit(1);
}
}
struct Checker
{
Checker()
{
checkRequiredInstructions();
}
} checker
#ifndef OS_DARWIN
__attribute__((init_priority(101))) /// Run before other static initializers.
#endif
;
#if !defined(USE_MUSL)
/// NOTE: We will migrate to full static linking or our own dynamic loader to make this code obsolete.
void checkHarmfulEnvironmentVariables(char ** argv)
{
std::initializer_list<const char *> harmful_env_variables = {
/// The list is a selection from "man ld-linux".
"LD_PRELOAD",
"LD_LIBRARY_PATH",
"LD_ORIGIN_PATH",
"LD_AUDIT",
"LD_DYNAMIC_WEAK",
/// The list is a selection from "man dyld" (osx).
"DYLD_LIBRARY_PATH",
"DYLD_FALLBACK_LIBRARY_PATH",
"DYLD_VERSIONED_LIBRARY_PATH",
"DYLD_INSERT_LIBRARIES",
};
bool require_reexec = false;
for (const auto * var : harmful_env_variables)
{
if (const char * value = getenv(var); value && value[0]) // NOLINT(concurrency-mt-unsafe)
{
/// NOTE: setenv() is used over unsetenv() since unsetenv() marked as harmful
if (setenv(var, "", true)) // NOLINT(concurrency-mt-unsafe) // this is safe if not called concurrently
{
fmt::print(stderr, "Cannot override {} environment variable", var);
_exit(1);
}
require_reexec = true;
}
}
if (require_reexec)
{
/// Use execvp() over execv() to search in PATH.
///
/// This should be safe, since:
/// - if argv[0] is relative path - it is OK
/// - if argv[0] has only basename, the it will search in PATH, like shell will do.
///
/// Also note, that this (search in PATH) because there is no easy and
/// portable way to get absolute path of argv[0].
/// - on linux there is /proc/self/exec and AT_EXECFN
/// - but on other OSes there is no such thing (especially on OSX).
///
/// And since static linking will be done someday anyway,
/// let's not pollute the code base with special cases.
int error = execvp(argv[0], argv);
_exit(error);
}
}
#endif
#if defined(SANITIZE_COVERAGE)
__attribute__((no_sanitize("coverage")))
void dumpCoverage()
{
/// A user can request to dump the coverage information into files at exit.
/// This is useful for non-server applications such as clickhouse-format or clickhouse-client,
/// that cannot introspect it with SQL functions at runtime.
/// The CLICKHOUSE_WRITE_COVERAGE environment variable defines a prefix for a filename 'prefix.pid'
/// containing the list of addresses of covered .
/// The format is even simpler than Clang's "sancov": an array of 64-bit addresses, native byte order, no header.
if (const char * coverage_filename_prefix = getenv("CLICKHOUSE_WRITE_COVERAGE")) // NOLINT(concurrency-mt-unsafe)
{
auto dump = [](const std::string & name, auto span)
{
/// Write only non-zeros.
std::vector<uintptr_t> data;
data.reserve(span.size());
for (auto addr : span)
if (addr)
data.push_back(addr);
int fd = ::open(name.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0400);
if (-1 == fd)
{
writeError("Cannot open a file to write the coverage data\n");
}
else
{
if (!writeRetry(fd, reinterpret_cast<const char *>(data.data()), data.size() * sizeof(data[0])))
writeError("Cannot write the coverage data to a file\n");
if (0 != ::close(fd))
writeError("Cannot close the file with coverage data\n");
}
};
dump(fmt::format("{}.{}", coverage_filename_prefix, getpid()), getCumulativeCoverage());
}
}
#endif
}
bool isClickhouseApp(std::string_view app_suffix, std::vector<char *> & argv)

45
src/Common/Coverage.cpp Normal file
View File

@ -0,0 +1,45 @@
#include <Common/Coverage.h>
#if defined(SANITIZE_COVERAGE)
__attribute__((no_sanitize("coverage")))
void dumpCoverage()
{
/// A user can request to dump the coverage information into files at exit.
/// This is useful for non-server applications such as clickhouse-format or clickhouse-client,
/// that cannot introspect it with SQL functions at runtime.
/// The CLICKHOUSE_WRITE_COVERAGE environment variable defines a prefix for a filename 'prefix.pid'
/// containing the list of addresses of covered .
/// The format is even simpler than Clang's "sancov": an array of 64-bit addresses, native byte order, no header.
if (const char * coverage_filename_prefix = getenv("CLICKHOUSE_WRITE_COVERAGE")) // NOLINT(concurrency-mt-unsafe)
{
auto dump = [](const std::string & name, auto span)
{
/// Write only non-zeros.
std::vector<uintptr_t> data;
data.reserve(span.size());
for (auto addr : span)
if (addr)
data.push_back(addr);
int fd = ::open(name.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0400);
if (-1 == fd)
{
writeError("Cannot open a file to write the coverage data\n");
}
else
{
if (!writeRetry(fd, reinterpret_cast<const char *>(data.data()), data.size() * sizeof(data[0])))
writeError("Cannot write the coverage data to a file\n");
if (0 != ::close(fd))
writeError("Cannot close the file with coverage data\n");
}
};
dump(fmt::format("{}.{}", coverage_filename_prefix, getpid()), getCumulativeCoverage());
}
}
#endif

5
src/Common/Coverage.h Normal file
View File

@ -0,0 +1,5 @@
#pragma once
#if defined(SANITIZE_COVERAGE)
void dumpCoverage();
#endif

234
src/Common/EnvironmentChecks.cpp Normal file
View File

@ -0,0 +1,234 @@
#include <Common/EnvironmentChecks.h>
#include <Common/IO.h>
#include <fmt/format.h>
#include <csignal>
#include <csetjmp>
#include <cstdint>
#include <tuple>
#include <unistd.h>
namespace
{
enum class InstructionFail : uint8_t
{
NONE = 0,
SSE3 = 1,
SSSE3 = 2,
SSE4_1 = 3,
SSE4_2 = 4,
POPCNT = 5,
AVX = 6,
AVX2 = 7,
AVX512 = 8
};
auto instructionFailToString(InstructionFail fail)
{
switch (fail)
{
#define ret(x) return std::make_tuple(STDERR_FILENO, x, sizeof(x) - 1)
case InstructionFail::NONE:
ret("NONE");
case InstructionFail::SSE3:
ret("SSE3");
case InstructionFail::SSSE3:
ret("SSSE3");
case InstructionFail::SSE4_1:
ret("SSE4.1");
case InstructionFail::SSE4_2:
ret("SSE4.2");
case InstructionFail::POPCNT:
ret("POPCNT");
case InstructionFail::AVX:
ret("AVX");
case InstructionFail::AVX2:
ret("AVX2");
case InstructionFail::AVX512:
ret("AVX512");
#undef ret
}
}
sigjmp_buf jmpbuf;
[[noreturn]] void sigIllCheckHandler(int, siginfo_t *, void *)
{
siglongjmp(jmpbuf, 1);
}
/// Check if necessary SSE extensions are available by trying to execute some sse instructions.
/// If instruction is unavailable, SIGILL will be sent by kernel.
void checkRequiredInstructionsImpl(volatile InstructionFail & fail)
{
#if defined(__SSE3__)
fail = InstructionFail::SSE3;
__asm__ volatile ("addsubpd %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSSE3__)
fail = InstructionFail::SSSE3;
__asm__ volatile ("pabsw %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSE4_1__)
fail = InstructionFail::SSE4_1;
__asm__ volatile ("pmaxud %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSE4_2__)
fail = InstructionFail::SSE4_2;
__asm__ volatile ("pcmpgtq %%xmm0, %%xmm0" : : : "xmm0");
#endif
/// Defined by -msse4.2
#if defined(__POPCNT__)
fail = InstructionFail::POPCNT;
{
uint64_t a = 0;
uint64_t b = 0;
__asm__ volatile ("popcnt %1, %0" : "=r"(a) :"r"(b) :);
}
#endif
#if defined(__AVX__)
fail = InstructionFail::AVX;
__asm__ volatile ("vaddpd %%ymm0, %%ymm0, %%ymm0" : : : "ymm0");
#endif
#if defined(__AVX2__)
fail = InstructionFail::AVX2;
__asm__ volatile ("vpabsw %%ymm0, %%ymm0" : : : "ymm0");
#endif
#if defined(__AVX512__)
fail = InstructionFail::AVX512;
__asm__ volatile ("vpabsw %%zmm0, %%zmm0" : : : "zmm0");
#endif
fail = InstructionFail::NONE;
}
/// Macros to avoid using strlen(), since it may fail if SSE is not supported.
#define writeError(data) do \
{ \
static_assert(__builtin_constant_p(data)); \
if (!writeRetry(STDERR_FILENO, data, sizeof(data) - 1)) \
_Exit(1); \
} while (false)
/// Check SSE and others instructions availability. Calls exit on fail.
/// This function must be called as early as possible, even before main, because static initializers may use unavailable instructions.
void checkRequiredInstructions()
{
struct sigaction sa{};
struct sigaction sa_old{};
sa.sa_sigaction = sigIllCheckHandler;
sa.sa_flags = SA_SIGINFO;
auto signal = SIGILL;
if (sigemptyset(&sa.sa_mask) != 0
|| sigaddset(&sa.sa_mask, signal) != 0
|| sigaction(signal, &sa, &sa_old) != 0)
{
/// You may wonder about strlen.
/// Typical implementation of strlen is using SSE4.2 or AVX2.
/// But this is not the case because it's compiler builtin and is executed at compile time.
writeError("Can not set signal handler\n");
_Exit(1);
}
volatile InstructionFail fail = InstructionFail::NONE;
if (sigsetjmp(jmpbuf, 1))
{
writeError("Instruction check fail. The CPU does not support ");
if (!std::apply(writeRetry, instructionFailToString(fail)))
_Exit(1);
writeError(" instruction set.\n");
_Exit(1);
}
checkRequiredInstructionsImpl(fail);
if (sigaction(signal, &sa_old, nullptr))
{
writeError("Can not set signal handler\n");
_Exit(1);
}
}
struct Checker
{
Checker()
{
checkRequiredInstructions();
}
} checker
#ifndef OS_DARWIN
__attribute__((init_priority(101))) /// Run before other static initializers.
#endif
;
}
#if !defined(USE_MUSL)
/// NOTE: We will migrate to full static linking or our own dynamic loader to make this code obsolete.
void checkHarmfulEnvironmentVariables(char ** argv)
{
std::initializer_list<const char *> harmful_env_variables = {
/// The list is a selection from "man ld-linux".
"LD_PRELOAD",
"LD_LIBRARY_PATH",
"LD_ORIGIN_PATH",
"LD_AUDIT",
"LD_DYNAMIC_WEAK",
/// The list is a selection from "man dyld" (osx).
"DYLD_LIBRARY_PATH",
"DYLD_FALLBACK_LIBRARY_PATH",
"DYLD_VERSIONED_LIBRARY_PATH",
"DYLD_INSERT_LIBRARIES",
};
bool require_reexec = false;
for (const auto * var : harmful_env_variables)
{
if (const char * value = getenv(var); value && value[0]) // NOLINT(concurrency-mt-unsafe)
{
/// NOTE: setenv() is used over unsetenv() since unsetenv() marked as harmful
if (setenv(var, "", true)) // NOLINT(concurrency-mt-unsafe) // this is safe if not called concurrently
{
fmt::print(stderr, "Cannot override {} environment variable", var);
_exit(1);
}
require_reexec = true;
}
}
if (require_reexec)
{
/// Use execvp() over execv() to search in PATH.
///
/// This should be safe, since:
/// - if argv[0] is relative path - it is OK
/// - if argv[0] has only basename, the it will search in PATH, like shell will do.
///
/// Also note, that this (search in PATH) because there is no easy and
/// portable way to get absolute path of argv[0].
/// - on linux there is /proc/self/exec and AT_EXECFN
/// - but on other OSes there is no such thing (especially on OSX).
///
/// And since static linking will be done someday anyway,
/// let's not pollute the code base with special cases.
int error = execvp(argv[0], argv);
_exit(error);
}
}
#endif

5
src/Common/EnvironmentChecks.h Normal file
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#pragma once
#if !defined(USE_MUSL)
void checkHarmfulEnvironmentVariables(char ** argv);
#endif