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Several `#if SANITIZER_LINUX && !SANITIZER_ANDROID` guards are replaced with the more appropriate `#if SANITIZER_GLIBC` (the headers are glibc extensions, not specific to Linux (i.e. if we ever support GNU/kFreeBSD or Hurd, the guards may automatically work)). Several `#if SANITIZER_LINUX && !SANITIZER_ANDROID` guards are refined with `#if SANITIZER_GLIBC` (the definitions are available on Linux glibc, but may not be available on other libc (e.g. musl) implementations). This patch makes `ninja asan cfi lsan msan stats tsan ubsan xray` build on a musl based Linux distribution (apk install musl-libintl) Notes about disabled interceptors for musl: * `SANITIZER_INTERCEPT_GLOB`: musl does not implement `GLOB_ALTDIRFUNC` (GNU extension) * Some ioctl structs and functions operating on them. * `SANITIZER_INTERCEPT___PRINTF_CHK`: `_FORTIFY_SOURCE` functions are GNU extension * `SANITIZER_INTERCEPT___STRNDUP`: `dlsym(RTLD_NEXT, "__strndup")` errors so a diagnostic is formed. The diagnostic uses `write` which hasn't been intercepted => SIGSEGV * `SANITIZER_INTERCEPT_*64`: the `_LARGEFILE64_SOURCE` functions are glibc specific. musl does something like `#define pread64 pread` * Disabled `msg_iovlen msg_controllen cmsg_len` checks: musl is conforming while many implementations (Linux/FreeBSD/NetBSD/Solaris) are non-conforming. Since we pick the glibc definition, exclude the checks for musl (incompatible sizes but compatible offsets) Pass through LIBCXX_HAS_MUSL_LIBC to make check-msan/check-tsan able to build libc++ (https://bugs.llvm.org/show_bug.cgi?id=48618). Many sanitizer features are available now. ``` % ninja check-asan (known issues: * ASAN_OPTIONS=fast_unwind_on_malloc=0 odr-violations hangs ) ... Testing Time: 53.69s Unsupported : 185 Passed : 512 Expectedly Failed: 1 Failed : 12 % ninja check-ubsan check-ubsan-minimal check-memprof # all passed % ninja check-cfi ( all cross-dso/) ... Testing Time: 8.68s Unsupported : 264 Passed : 80 Expectedly Failed: 8 Failed : 32 % ninja check-lsan (With GetTls (D93972), 10 failures) Testing Time: 4.09s Unsupported: 7 Passed : 65 Failed : 22 % ninja check-msan (Many are due to functions not marked unsupported.) Testing Time: 23.09s Unsupported : 6 Passed : 764 Expectedly Failed: 2 Failed : 58 % ninja check-tsan Testing Time: 23.21s Unsupported : 86 Passed : 295 Expectedly Failed: 1 Failed : 25 ``` Used `ASAN_OPTIONS=verbosity=2` to verify there is no unneeded interceptor. Partly based on Jari Ronkainen's https://reviews.llvm.org/D63785#1921014 Note: we need to place `_FILE_OFFSET_BITS` above `#include "sanitizer_platform.h"` to avoid `#define __USE_FILE_OFFSET64 1` in 32-bit ARM `features.h` Reviewed By: vitalybuka Differential Revision: https://reviews.llvm.org/D93848
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
//===-- interception_linux.cpp ----------------------------------*- C++ -*-===//
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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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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// Linux-specific interception methods.
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//===----------------------------------------------------------------------===//
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#include "interception.h"
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#if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \
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SANITIZER_SOLARIS
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#include <dlfcn.h> // for dlsym() and dlvsym()
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namespace __interception {
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#if SANITIZER_NETBSD
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static int StrCmp(const char *s1, const char *s2) {
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while (true) {
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if (*s1 != *s2)
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return false;
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if (*s1 == 0)
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return true;
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s1++;
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s2++;
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}
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}
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#endif
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static void *GetFuncAddr(const char *name, uptr wrapper_addr) {
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#if SANITIZER_NETBSD
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// FIXME: Find a better way to handle renames
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if (StrCmp(name, "sigaction"))
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name = "__sigaction14";
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#endif
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void *addr = dlsym(RTLD_NEXT, name);
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if (!addr) {
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// If the lookup using RTLD_NEXT failed, the sanitizer runtime library is
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// later in the library search order than the DSO that we are trying to
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// intercept, which means that we cannot intercept this function. We still
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// want the address of the real definition, though, so look it up using
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// RTLD_DEFAULT.
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addr = dlsym(RTLD_DEFAULT, name);
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// In case `name' is not loaded, dlsym ends up finding the actual wrapper.
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// We don't want to intercept the wrapper and have it point to itself.
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if ((uptr)addr == wrapper_addr)
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addr = nullptr;
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}
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return addr;
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}
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bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
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uptr wrapper) {
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void *addr = GetFuncAddr(name, wrapper);
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*ptr_to_real = (uptr)addr;
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return addr && (func == wrapper);
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}
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// dlvsym is a GNU extension supported by some other platforms.
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#if SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
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static void *GetFuncAddr(const char *name, const char *ver) {
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return dlvsym(RTLD_NEXT, name, ver);
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}
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bool InterceptFunction(const char *name, const char *ver, uptr *ptr_to_real,
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uptr func, uptr wrapper) {
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void *addr = GetFuncAddr(name, ver);
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*ptr_to_real = (uptr)addr;
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return addr && (func == wrapper);
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}
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#endif // SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
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} // namespace __interception
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#endif // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD ||
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// SANITIZER_SOLARIS
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