forked from OSchip/llvm-project
369 lines
11 KiB
C++
369 lines
11 KiB
C++
//===-- sanitizer_linux_libcdep.cc ----------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries and implements linux-specific functions from
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// sanitizer_libc.h.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_LINUX
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#include "sanitizer_common.h"
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#include "sanitizer_flags.h"
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#include "sanitizer_linux.h"
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#include "sanitizer_placement_new.h"
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#include "sanitizer_procmaps.h"
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#include "sanitizer_stacktrace.h"
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#include <dlfcn.h>
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#include <pthread.h>
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#include <sys/prctl.h>
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#include <sys/resource.h>
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#include <unwind.h>
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#if !SANITIZER_ANDROID
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#include <elf.h>
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#include <link.h>
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#endif
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// This function is defined elsewhere if we intercepted pthread_attr_getstack.
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SANITIZER_WEAK_ATTRIBUTE
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int __sanitizer_pthread_attr_getstack(void *attr, void **addr, size_t *size) {
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return pthread_attr_getstack((pthread_attr_t*)attr, addr, size);
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}
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namespace __sanitizer {
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void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
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uptr *stack_bottom) {
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static const uptr kMaxThreadStackSize = 1 << 30; // 1Gb
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CHECK(stack_top);
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CHECK(stack_bottom);
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if (at_initialization) {
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// This is the main thread. Libpthread may not be initialized yet.
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struct rlimit rl;
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CHECK_EQ(getrlimit(RLIMIT_STACK, &rl), 0);
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// Find the mapping that contains a stack variable.
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MemoryMappingLayout proc_maps(/*cache_enabled*/true);
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uptr start, end, offset;
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uptr prev_end = 0;
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while (proc_maps.Next(&start, &end, &offset, 0, 0, /* protection */0)) {
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if ((uptr)&rl < end)
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break;
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prev_end = end;
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}
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CHECK((uptr)&rl >= start && (uptr)&rl < end);
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// Get stacksize from rlimit, but clip it so that it does not overlap
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// with other mappings.
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uptr stacksize = rl.rlim_cur;
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if (stacksize > end - prev_end)
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stacksize = end - prev_end;
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// When running with unlimited stack size, we still want to set some limit.
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// The unlimited stack size is caused by 'ulimit -s unlimited'.
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// Also, for some reason, GNU make spawns subprocesses with unlimited stack.
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if (stacksize > kMaxThreadStackSize)
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stacksize = kMaxThreadStackSize;
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*stack_top = end;
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*stack_bottom = end - stacksize;
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return;
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}
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pthread_attr_t attr;
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CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0);
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uptr stacksize = 0;
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void *stackaddr = 0;
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__sanitizer_pthread_attr_getstack(&attr, &stackaddr, (size_t*)&stacksize);
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pthread_attr_destroy(&attr);
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CHECK_LE(stacksize, kMaxThreadStackSize); // Sanity check.
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*stack_top = (uptr)stackaddr + stacksize;
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*stack_bottom = (uptr)stackaddr;
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}
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// Does not compile for Go because dlsym() requires -ldl
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#ifndef SANITIZER_GO
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bool SetEnv(const char *name, const char *value) {
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void *f = dlsym(RTLD_NEXT, "setenv");
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if (f == 0)
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return false;
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typedef int(*setenv_ft)(const char *name, const char *value, int overwrite);
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setenv_ft setenv_f;
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CHECK_EQ(sizeof(setenv_f), sizeof(f));
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internal_memcpy(&setenv_f, &f, sizeof(f));
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return IndirectExternCall(setenv_f)(name, value, 1) == 0;
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}
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#endif
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bool SanitizerSetThreadName(const char *name) {
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#ifdef PR_SET_NAME
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return 0 == prctl(PR_SET_NAME, (unsigned long)name, 0, 0, 0); // NOLINT
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#else
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return false;
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#endif
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}
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bool SanitizerGetThreadName(char *name, int max_len) {
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#ifdef PR_GET_NAME
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char buff[17];
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if (prctl(PR_GET_NAME, (unsigned long)buff, 0, 0, 0)) // NOLINT
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return false;
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internal_strncpy(name, buff, max_len);
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name[max_len] = 0;
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return true;
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#else
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return false;
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#endif
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}
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#ifndef SANITIZER_GO
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//------------------------- SlowUnwindStack -----------------------------------
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#ifdef __arm__
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#define UNWIND_STOP _URC_END_OF_STACK
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#define UNWIND_CONTINUE _URC_NO_REASON
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#else
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#define UNWIND_STOP _URC_NORMAL_STOP
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#define UNWIND_CONTINUE _URC_NO_REASON
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#endif
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uptr Unwind_GetIP(struct _Unwind_Context *ctx) {
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#ifdef __arm__
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uptr val;
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_Unwind_VRS_Result res = _Unwind_VRS_Get(ctx, _UVRSC_CORE,
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15 /* r15 = PC */, _UVRSD_UINT32, &val);
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CHECK(res == _UVRSR_OK && "_Unwind_VRS_Get failed");
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// Clear the Thumb bit.
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return val & ~(uptr)1;
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#else
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return _Unwind_GetIP(ctx);
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#endif
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}
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struct UnwindTraceArg {
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StackTrace *stack;
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uptr max_depth;
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};
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_Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {
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UnwindTraceArg *arg = (UnwindTraceArg*)param;
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CHECK_LT(arg->stack->size, arg->max_depth);
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uptr pc = Unwind_GetIP(ctx);
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arg->stack->trace[arg->stack->size++] = pc;
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if (arg->stack->size == arg->max_depth) return UNWIND_STOP;
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return UNWIND_CONTINUE;
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}
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void StackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
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size = 0;
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if (max_depth == 0)
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return;
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UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)};
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_Unwind_Backtrace(Unwind_Trace, &arg);
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// We need to pop a few frames so that pc is on top.
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uptr to_pop = LocatePcInTrace(pc);
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// trace[0] belongs to the current function so we always pop it.
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if (to_pop == 0)
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to_pop = 1;
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PopStackFrames(to_pop);
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trace[0] = pc;
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}
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#endif // !SANITIZER_GO
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static uptr g_tls_size;
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#ifdef __i386__
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# define DL_INTERNAL_FUNCTION __attribute__((regparm(3), stdcall))
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#else
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# define DL_INTERNAL_FUNCTION
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#endif
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void InitTlsSize() {
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#if !defined(SANITIZER_GO) && !SANITIZER_ANDROID
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typedef void (*get_tls_func)(size_t*, size_t*) DL_INTERNAL_FUNCTION;
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get_tls_func get_tls;
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void *get_tls_static_info_ptr = dlsym(RTLD_NEXT, "_dl_get_tls_static_info");
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CHECK_EQ(sizeof(get_tls), sizeof(get_tls_static_info_ptr));
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internal_memcpy(&get_tls, &get_tls_static_info_ptr,
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sizeof(get_tls_static_info_ptr));
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CHECK_NE(get_tls, 0);
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size_t tls_size = 0;
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size_t tls_align = 0;
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IndirectExternCall(get_tls)(&tls_size, &tls_align);
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g_tls_size = tls_size;
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#endif
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}
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uptr GetTlsSize() {
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return g_tls_size;
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}
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#if defined(__x86_64__) || defined(__i386__)
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// sizeof(struct thread) from glibc.
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// There has been a report of this being different on glibc 2.11 and 2.13. We
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// don't know when this change happened, so 2.14 is a conservative estimate.
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#if __GLIBC_PREREQ(2, 14)
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const uptr kThreadDescriptorSize = FIRST_32_SECOND_64(1216, 2304);
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#else
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const uptr kThreadDescriptorSize = FIRST_32_SECOND_64(1168, 2304);
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#endif
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uptr ThreadDescriptorSize() {
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return kThreadDescriptorSize;
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}
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// The offset at which pointer to self is located in the thread descriptor.
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const uptr kThreadSelfOffset = FIRST_32_SECOND_64(8, 16);
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uptr ThreadSelfOffset() {
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return kThreadSelfOffset;
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}
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uptr ThreadSelf() {
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uptr descr_addr;
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#ifdef __i386__
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asm("mov %%gs:%c1,%0" : "=r"(descr_addr) : "i"(kThreadSelfOffset));
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#else
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asm("mov %%fs:%c1,%0" : "=r"(descr_addr) : "i"(kThreadSelfOffset));
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#endif
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return descr_addr;
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}
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#endif // defined(__x86_64__) || defined(__i386__)
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void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
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uptr *tls_addr, uptr *tls_size) {
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#ifndef SANITIZER_GO
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#if defined(__x86_64__) || defined(__i386__)
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*tls_addr = ThreadSelf();
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*tls_size = GetTlsSize();
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*tls_addr -= *tls_size;
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*tls_addr += kThreadDescriptorSize;
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#else
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*tls_addr = 0;
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*tls_size = 0;
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#endif
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uptr stack_top, stack_bottom;
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GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
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*stk_addr = stack_bottom;
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*stk_size = stack_top - stack_bottom;
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if (!main) {
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// If stack and tls intersect, make them non-intersecting.
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if (*tls_addr > *stk_addr && *tls_addr < *stk_addr + *stk_size) {
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CHECK_GT(*tls_addr + *tls_size, *stk_addr);
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CHECK_LE(*tls_addr + *tls_size, *stk_addr + *stk_size);
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*stk_size -= *tls_size;
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*tls_addr = *stk_addr + *stk_size;
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}
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}
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#else // SANITIZER_GO
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*stk_addr = 0;
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*stk_size = 0;
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*tls_addr = 0;
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*tls_size = 0;
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#endif // SANITIZER_GO
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}
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void AdjustStackSizeLinux(void *attr_) {
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pthread_attr_t *attr = (pthread_attr_t *)attr_;
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uptr stackaddr = 0;
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size_t stacksize = 0;
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__sanitizer_pthread_attr_getstack(attr, (void**)&stackaddr, &stacksize);
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// GLibC will return (0 - stacksize) as the stack address in the case when
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// stacksize is set, but stackaddr is not.
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bool stack_set = (stackaddr != 0) && (stackaddr + stacksize != 0);
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// We place a lot of tool data into TLS, account for that.
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const uptr minstacksize = GetTlsSize() + 128*1024;
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if (stacksize < minstacksize) {
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if (!stack_set) {
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if (stacksize != 0)
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VPrintf(1, "Sanitizer: increasing stacksize %zu->%zu\n", stacksize,
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minstacksize);
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pthread_attr_setstacksize(attr, minstacksize);
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} else {
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Printf("Sanitizer: pre-allocated stack size is insufficient: "
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"%zu < %zu\n", stacksize, minstacksize);
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Printf("Sanitizer: pthread_create is likely to fail.\n");
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}
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}
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}
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#if SANITIZER_ANDROID
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uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
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string_predicate_t filter) {
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return 0;
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}
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#else // SANITIZER_ANDROID
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typedef ElfW(Phdr) Elf_Phdr;
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struct DlIteratePhdrData {
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LoadedModule *modules;
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uptr current_n;
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bool first;
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uptr max_n;
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string_predicate_t filter;
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};
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static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
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DlIteratePhdrData *data = (DlIteratePhdrData*)arg;
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if (data->current_n == data->max_n)
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return 0;
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InternalScopedBuffer<char> module_name(kMaxPathLength);
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module_name.data()[0] = '\0';
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if (data->first) {
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data->first = false;
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// First module is the binary itself.
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ReadBinaryName(module_name.data(), module_name.size());
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} else if (info->dlpi_name) {
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internal_strncpy(module_name.data(), info->dlpi_name, module_name.size());
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}
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if (module_name.data()[0] == '\0')
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return 0;
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if (data->filter && !data->filter(module_name.data()))
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return 0;
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void *mem = &data->modules[data->current_n];
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LoadedModule *cur_module = new(mem) LoadedModule(module_name.data(),
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info->dlpi_addr);
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data->current_n++;
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for (int i = 0; i < info->dlpi_phnum; i++) {
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const Elf_Phdr *phdr = &info->dlpi_phdr[i];
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if (phdr->p_type == PT_LOAD) {
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uptr cur_beg = info->dlpi_addr + phdr->p_vaddr;
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uptr cur_end = cur_beg + phdr->p_memsz;
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cur_module->addAddressRange(cur_beg, cur_end);
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}
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}
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return 0;
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}
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uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
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string_predicate_t filter) {
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CHECK(modules);
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DlIteratePhdrData data = {modules, 0, true, max_modules, filter};
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dl_iterate_phdr(dl_iterate_phdr_cb, &data);
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return data.current_n;
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}
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#endif // SANITIZER_ANDROID
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#ifndef SANITIZER_GO
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uptr indirect_call_wrapper;
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void SetIndirectCallWrapper(uptr wrapper) {
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CHECK(!indirect_call_wrapper);
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CHECK(wrapper);
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indirect_call_wrapper = wrapper;
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}
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#endif
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} // namespace __sanitizer
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#endif // SANITIZER_LINUX
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