diff options
Diffstat (limited to 'libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc')
| -rw-r--r-- | libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc | 255 |
1 files changed, 202 insertions, 53 deletions
diff --git a/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc b/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc index c9eb435be91..e754b26e693 100644 --- a/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc +++ b/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc @@ -11,7 +11,7 @@ //===----------------------------------------------------------------------===// #include "sanitizer_platform.h" -#if SANITIZER_LINUX +#if SANITIZER_FREEBSD || SANITIZER_LINUX #include "sanitizer_common.h" #include "sanitizer_flags.h" @@ -23,27 +23,53 @@ #include <dlfcn.h> #include <pthread.h> -#include <sys/prctl.h> +#include <signal.h> #include <sys/resource.h> +#if SANITIZER_FREEBSD +#define _GNU_SOURCE // to declare _Unwind_Backtrace() from <unwind.h> +#endif #include <unwind.h> +#if SANITIZER_FREEBSD +#include <pthread_np.h> +#define pthread_getattr_np pthread_attr_get_np +#endif + +#if SANITIZER_LINUX +#include <sys/prctl.h> +#endif + #if !SANITIZER_ANDROID #include <elf.h> #include <link.h> #include <unistd.h> #endif +namespace __sanitizer { + // This function is defined elsewhere if we intercepted pthread_attr_getstack. -SANITIZER_WEAK_ATTRIBUTE -int __sanitizer_pthread_attr_getstack(void *attr, void **addr, size_t *size) { - return pthread_attr_getstack((pthread_attr_t*)attr, addr, size); +extern "C" { +SANITIZER_WEAK_ATTRIBUTE int +real_pthread_attr_getstack(void *attr, void **addr, size_t *size); +} // extern "C" + +static int my_pthread_attr_getstack(void *attr, void **addr, size_t *size) { + if (real_pthread_attr_getstack) + return real_pthread_attr_getstack((pthread_attr_t *)attr, addr, size); + return pthread_attr_getstack((pthread_attr_t *)attr, addr, size); } -namespace __sanitizer { +SANITIZER_WEAK_ATTRIBUTE int +real_sigaction(int signum, const void *act, void *oldact); + +int internal_sigaction(int signum, const void *act, void *oldact) { + if (real_sigaction) + return real_sigaction(signum, act, oldact); + return sigaction(signum, (struct sigaction *)act, (struct sigaction *)oldact); +} void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top, uptr *stack_bottom) { - static const uptr kMaxThreadStackSize = 1 << 30; // 1Gb CHECK(stack_top); CHECK(stack_bottom); if (at_initialization) { @@ -77,10 +103,11 @@ void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top, return; } pthread_attr_t attr; + pthread_attr_init(&attr); CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0); uptr stacksize = 0; void *stackaddr = 0; - __sanitizer_pthread_attr_getstack(&attr, &stackaddr, (size_t*)&stacksize); + my_pthread_attr_getstack(&attr, &stackaddr, (size_t*)&stacksize); pthread_attr_destroy(&attr); CHECK_LE(stacksize, kMaxThreadStackSize); // Sanity check. @@ -88,8 +115,6 @@ void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top, *stack_bottom = (uptr)stackaddr; } -// Does not compile for Go because dlsym() requires -ldl -#ifndef SANITIZER_GO bool SetEnv(const char *name, const char *value) { void *f = dlsym(RTLD_NEXT, "setenv"); if (f == 0) @@ -98,9 +123,8 @@ bool SetEnv(const char *name, const char *value) { setenv_ft setenv_f; CHECK_EQ(sizeof(setenv_f), sizeof(f)); internal_memcpy(&setenv_f, &f, sizeof(f)); - return setenv_f(name, value, 1) == 0; + return IndirectExternCall(setenv_f)(name, value, 1) == 0; } -#endif bool SanitizerSetThreadName(const char *name) { #ifdef PR_SET_NAME @@ -123,8 +147,52 @@ bool SanitizerGetThreadName(char *name, int max_len) { #endif } -#ifndef SANITIZER_GO //------------------------- SlowUnwindStack ----------------------------------- + +typedef struct { + uptr absolute_pc; + uptr stack_top; + uptr stack_size; +} backtrace_frame_t; + +extern "C" { +typedef void *(*acquire_my_map_info_list_func)(); +typedef void (*release_my_map_info_list_func)(void *map); +typedef sptr (*unwind_backtrace_signal_arch_func)( + void *siginfo, void *sigcontext, void *map_info_list, + backtrace_frame_t *backtrace, uptr ignore_depth, uptr max_depth); +acquire_my_map_info_list_func acquire_my_map_info_list; +release_my_map_info_list_func release_my_map_info_list; +unwind_backtrace_signal_arch_func unwind_backtrace_signal_arch; +} // extern "C" + +#if SANITIZER_ANDROID +void SanitizerInitializeUnwinder() { + void *p = dlopen("libcorkscrew.so", RTLD_LAZY); + if (!p) { + VReport(1, + "Failed to open libcorkscrew.so. You may see broken stack traces " + "in SEGV reports."); + return; + } + acquire_my_map_info_list = + (acquire_my_map_info_list_func)(uptr)dlsym(p, "acquire_my_map_info_list"); + release_my_map_info_list = + (release_my_map_info_list_func)(uptr)dlsym(p, "release_my_map_info_list"); + unwind_backtrace_signal_arch = (unwind_backtrace_signal_arch_func)(uptr)dlsym( + p, "unwind_backtrace_signal_arch"); + if (!acquire_my_map_info_list || !release_my_map_info_list || + !unwind_backtrace_signal_arch) { + VReport(1, + "Failed to find one of the required symbols in libcorkscrew.so. " + "You may see broken stack traces in SEGV reports."); + acquire_my_map_info_list = NULL; + unwind_backtrace_signal_arch = NULL; + release_my_map_info_list = NULL; + } +} +#endif + #ifdef __arm__ #define UNWIND_STOP _URC_END_OF_STACK #define UNWIND_CONTINUE _URC_NO_REASON @@ -161,9 +229,8 @@ _Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) { } void StackTrace::SlowUnwindStack(uptr pc, uptr max_depth) { + CHECK_GE(max_depth, 2); size = 0; - if (max_depth == 0) - return; UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)}; _Unwind_Backtrace(Unwind_Trace, &arg); // We need to pop a few frames so that pc is on top. @@ -175,9 +242,35 @@ void StackTrace::SlowUnwindStack(uptr pc, uptr max_depth) { trace[0] = pc; } -#endif // !SANITIZER_GO +void StackTrace::SlowUnwindStackWithContext(uptr pc, void *context, + uptr max_depth) { + CHECK_GE(max_depth, 2); + if (!unwind_backtrace_signal_arch) { + SlowUnwindStack(pc, max_depth); + return; + } + + void *map = acquire_my_map_info_list(); + CHECK(map); + InternalScopedBuffer<backtrace_frame_t> frames(kStackTraceMax); + // siginfo argument appears to be unused. + sptr res = unwind_backtrace_signal_arch(/* siginfo */ NULL, context, map, + frames.data(), + /* ignore_depth */ 0, max_depth); + release_my_map_info_list(map); + if (res < 0) return; + CHECK_LE((uptr)res, kStackTraceMax); + + size = 0; + // +2 compensate for libcorkscrew unwinder returning addresses of call + // instructions instead of raw return addresses. + for (sptr i = 0; i < res; ++i) + trace[size++] = frames[i].absolute_pc + 2; +} +#if !SANITIZER_FREEBSD static uptr g_tls_size; +#endif #ifdef __i386__ # define DL_INTERNAL_FUNCTION __attribute__((regparm(3), stdcall)) @@ -186,7 +279,7 @@ static uptr g_tls_size; #endif void InitTlsSize() { -#if !defined(SANITIZER_GO) && !SANITIZER_ANDROID +#if !SANITIZER_FREEBSD && !SANITIZER_ANDROID typedef void (*get_tls_func)(size_t*, size_t*) DL_INTERNAL_FUNCTION; get_tls_func get_tls; void *get_tls_static_info_ptr = dlsym(RTLD_NEXT, "_dl_get_tls_static_info"); @@ -196,16 +289,12 @@ void InitTlsSize() { CHECK_NE(get_tls, 0); size_t tls_size = 0; size_t tls_align = 0; - get_tls(&tls_size, &tls_align); + IndirectExternCall(get_tls)(&tls_size, &tls_align); g_tls_size = tls_size; -#endif -} - -uptr GetTlsSize() { - return g_tls_size; +#endif // !SANITIZER_FREEBSD && !SANITIZER_ANDROID } -#if defined(__x86_64__) || defined(__i386__) +#if (defined(__x86_64__) || defined(__i386__)) && SANITIZER_LINUX // sizeof(struct thread) from glibc. static atomic_uintptr_t kThreadDescriptorSize; @@ -221,7 +310,9 @@ uptr ThreadDescriptorSize() { int minor = internal_simple_strtoll(buf + 8, &end, 10); if (end != buf + 8 && (*end == '\0' || *end == '.')) { /* sizeof(struct thread) values from various glibc versions. */ - if (minor <= 3) + if (SANITIZER_X32) + val = 1728; // Assume only one particular version for x32. + else if (minor <= 3) val = FIRST_32_SECOND_64(1104, 1696); else if (minor == 4) val = FIRST_32_SECOND_64(1120, 1728); @@ -253,27 +344,79 @@ uptr ThreadSelfOffset() { uptr ThreadSelf() { uptr descr_addr; -#ifdef __i386__ +# if defined(__i386__) asm("mov %%gs:%c1,%0" : "=r"(descr_addr) : "i"(kThreadSelfOffset)); -#else +# elif defined(__x86_64__) asm("mov %%fs:%c1,%0" : "=r"(descr_addr) : "i"(kThreadSelfOffset)); -#endif +# else +# error "unsupported CPU arch" +# endif return descr_addr; } -#endif // defined(__x86_64__) || defined(__i386__) +#endif // (defined(__x86_64__) || defined(__i386__)) && SANITIZER_LINUX + +#if SANITIZER_FREEBSD +static void **ThreadSelfSegbase() { + void **segbase = 0; +# if defined(__i386__) + // sysarch(I386_GET_GSBASE, segbase); + __asm __volatile("mov %%gs:0, %0" : "=r" (segbase)); +# elif defined(__x86_64__) + // sysarch(AMD64_GET_FSBASE, segbase); + __asm __volatile("movq %%fs:0, %0" : "=r" (segbase)); +# else +# error "unsupported CPU arch for FreeBSD platform" +# endif + return segbase; +} -void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size, - uptr *tls_addr, uptr *tls_size) { -#ifndef SANITIZER_GO -#if defined(__x86_64__) || defined(__i386__) - *tls_addr = ThreadSelf(); - *tls_size = GetTlsSize(); - *tls_addr -= *tls_size; - *tls_addr += ThreadDescriptorSize(); +uptr ThreadSelf() { + return (uptr)ThreadSelfSegbase()[2]; +} +#endif // SANITIZER_FREEBSD + +static void GetTls(uptr *addr, uptr *size) { +#if SANITIZER_LINUX +# if defined(__x86_64__) || defined(__i386__) + *addr = ThreadSelf(); + *size = GetTlsSize(); + *addr -= *size; + *addr += ThreadDescriptorSize(); +# else + *addr = 0; + *size = 0; +# endif +#elif SANITIZER_FREEBSD + void** segbase = ThreadSelfSegbase(); + *addr = 0; + *size = 0; + if (segbase != 0) { + // tcbalign = 16 + // tls_size = round(tls_static_space, tcbalign); + // dtv = segbase[1]; + // dtv[2] = segbase - tls_static_space; + void **dtv = (void**) segbase[1]; + *addr = (uptr) dtv[2]; + *size = (*addr == 0) ? 0 : ((uptr) segbase[0] - (uptr) dtv[2]); + } +#else +# error "Unknown OS" +#endif +} + +uptr GetTlsSize() { +#if SANITIZER_FREEBSD + uptr addr, size; + GetTls(&addr, &size); + return size; #else - *tls_addr = 0; - *tls_size = 0; + return g_tls_size; #endif +} + +void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size, + uptr *tls_addr, uptr *tls_size) { + GetTls(tls_addr, tls_size); uptr stack_top, stack_bottom; GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom); @@ -289,19 +432,13 @@ void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size, *tls_addr = *stk_addr + *stk_size; } } -#else // SANITIZER_GO - *stk_addr = 0; - *stk_size = 0; - *tls_addr = 0; - *tls_size = 0; -#endif // SANITIZER_GO } -void AdjustStackSizeLinux(void *attr_) { +void AdjustStackSize(void *attr_) { pthread_attr_t *attr = (pthread_attr_t *)attr_; uptr stackaddr = 0; size_t stacksize = 0; - __sanitizer_pthread_attr_getstack(attr, (void**)&stackaddr, &stacksize); + my_pthread_attr_getstack(attr, (void**)&stackaddr, &stacksize); // GLibC will return (0 - stacksize) as the stack address in the case when // stacksize is set, but stackaddr is not. bool stack_set = (stackaddr != 0) && (stackaddr + stacksize != 0); @@ -309,10 +446,11 @@ void AdjustStackSizeLinux(void *attr_) { const uptr minstacksize = GetTlsSize() + 128*1024; if (stacksize < minstacksize) { if (!stack_set) { - if (common_flags()->verbosity && stacksize != 0) - Printf("Sanitizer: increasing stacksize %zu->%zu\n", stacksize, - minstacksize); - pthread_attr_setstacksize(attr, minstacksize); + if (stacksize != 0) { + VPrintf(1, "Sanitizer: increasing stacksize %zu->%zu\n", stacksize, + minstacksize); + pthread_attr_setstacksize(attr, minstacksize); + } } else { Printf("Sanitizer: pre-allocated stack size is insufficient: " "%zu < %zu\n", stacksize, minstacksize); @@ -324,10 +462,13 @@ void AdjustStackSizeLinux(void *attr_) { #if SANITIZER_ANDROID uptr GetListOfModules(LoadedModule *modules, uptr max_modules, string_predicate_t filter) { - return 0; + MemoryMappingLayout memory_mapping(false); + return memory_mapping.DumpListOfModules(modules, max_modules, filter); } #else // SANITIZER_ANDROID +# if !SANITIZER_FREEBSD typedef ElfW(Phdr) Elf_Phdr; +# endif struct DlIteratePhdrData { LoadedModule *modules; @@ -378,6 +519,14 @@ uptr GetListOfModules(LoadedModule *modules, uptr max_modules, } #endif // SANITIZER_ANDROID +uptr indirect_call_wrapper; + +void SetIndirectCallWrapper(uptr wrapper) { + CHECK(!indirect_call_wrapper); + CHECK(wrapper); + indirect_call_wrapper = wrapper; +} + } // namespace __sanitizer -#endif // SANITIZER_LINUX +#endif // SANITIZER_FREEBSD || SANITIZER_LINUX |