#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_FREEBSD || SANITIZER_LINUX
#include "asan_interceptors.h"
#include "asan_internal.h"
#include "asan_thread.h"
#include "sanitizer_common/sanitizer_flags.h"
#include "sanitizer_common/sanitizer_freebsd.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_procmaps.h"
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <dlfcn.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#include <unwind.h>
#if SANITIZER_FREEBSD
#include <sys/link_elf.h>
#endif
#if SANITIZER_ANDROID || SANITIZER_FREEBSD
#include <ucontext.h>
extern "C" void* _DYNAMIC;
#else
#include <sys/ucontext.h>
#include <link.h>
#endif
#if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32) && \
__FreeBSD_version <= 902001 #define ucontext_t xucontext_t
#endif
typedef enum {
ASAN_RT_VERSION_UNDEFINED = 0,
ASAN_RT_VERSION_DYNAMIC,
ASAN_RT_VERSION_STATIC,
} asan_rt_version_t;
extern "C" {
SANITIZER_INTERFACE_ATTRIBUTE
asan_rt_version_t __asan_rt_version;
}
namespace __asan {
void DisableReexec() {
}
void MaybeReexec() {
}
void *AsanDoesNotSupportStaticLinkage() {
return &_DYNAMIC; }
#if SANITIZER_ANDROID
void AsanCheckDynamicRTPrereqs() {}
void AsanCheckIncompatibleRT() {}
#else
static int FindFirstDSOCallback(struct dl_phdr_info *info, size_t size,
void *data) {
if (!info->dlpi_name || info->dlpi_name[0] == 0)
return 0;
if (internal_strncmp(info->dlpi_name, "linux-", sizeof("linux-") - 1) == 0)
return 0;
*(const char **)data = info->dlpi_name;
return 1;
}
static bool IsDynamicRTName(const char *libname) {
return internal_strstr(libname, "libclang_rt.asan") ||
internal_strstr(libname, "libasan.so");
}
static void ReportIncompatibleRT() {
Report("Your application is linked against incompatible ASan runtimes.\n");
Die();
}
void AsanCheckDynamicRTPrereqs() {
const char *first_dso_name = 0;
dl_iterate_phdr(FindFirstDSOCallback, &first_dso_name);
if (first_dso_name && !IsDynamicRTName(first_dso_name)) {
Report("ASan runtime does not come first in initial library list; "
"you should either link runtime to your application or "
"manually preload it with LD_PRELOAD.\n");
Die();
}
}
void AsanCheckIncompatibleRT() {
if (ASAN_DYNAMIC) {
if (__asan_rt_version == ASAN_RT_VERSION_UNDEFINED) {
__asan_rt_version = ASAN_RT_VERSION_DYNAMIC;
} else if (__asan_rt_version != ASAN_RT_VERSION_DYNAMIC) {
ReportIncompatibleRT();
}
} else {
if (__asan_rt_version == ASAN_RT_VERSION_UNDEFINED) {
MemoryMappingLayout proc_maps(true);
char filename[128];
while (proc_maps.Next(0, 0, 0, filename, sizeof(filename), 0)) {
if (IsDynamicRTName(filename)) {
Report("Your application is linked against "
"incompatible ASan runtimes.\n");
Die();
}
}
__asan_rt_version = ASAN_RT_VERSION_STATIC;
} else if (__asan_rt_version != ASAN_RT_VERSION_STATIC) {
ReportIncompatibleRT();
}
}
}
#endif // SANITIZER_ANDROID
void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
#if defined(__arm__)
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.arm_pc;
*bp = ucontext->uc_mcontext.arm_fp;
*sp = ucontext->uc_mcontext.arm_sp;
#elif defined(__aarch64__)
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.pc;
*bp = ucontext->uc_mcontext.regs[29];
*sp = ucontext->uc_mcontext.sp;
#elif defined(__hppa__)
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.sc_iaoq[0];
*bp = ucontext->uc_mcontext.sc_gr[3];
*sp = ucontext->uc_mcontext.sc_gr[30];
#elif defined(__x86_64__)
# if SANITIZER_FREEBSD
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.mc_rip;
*bp = ucontext->uc_mcontext.mc_rbp;
*sp = ucontext->uc_mcontext.mc_rsp;
# else
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.gregs[REG_RIP];
*bp = ucontext->uc_mcontext.gregs[REG_RBP];
*sp = ucontext->uc_mcontext.gregs[REG_RSP];
# endif
#elif defined(__i386__)
# if SANITIZER_FREEBSD
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.mc_eip;
*bp = ucontext->uc_mcontext.mc_ebp;
*sp = ucontext->uc_mcontext.mc_esp;
# else
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.gregs[REG_EIP];
*bp = ucontext->uc_mcontext.gregs[REG_EBP];
*sp = ucontext->uc_mcontext.gregs[REG_ESP];
# endif
#elif defined(__powerpc__) || defined(__powerpc64__)
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.regs->nip;
*sp = ucontext->uc_mcontext.regs->gpr[PT_R1];
*bp = ucontext->uc_mcontext.regs->gpr[PT_R31];
#elif defined(__sparc__)
ucontext_t *ucontext = (ucontext_t*)context;
uptr *stk_ptr;
# if defined (__arch64__)
*pc = ucontext->uc_mcontext.mc_gregs[MC_PC];
*sp = ucontext->uc_mcontext.mc_gregs[MC_O6];
stk_ptr = (uptr *) (*sp + 2047);
*bp = stk_ptr[15];
# else
*pc = ucontext->uc_mcontext.gregs[REG_PC];
*sp = ucontext->uc_mcontext.gregs[REG_O6];
stk_ptr = (uptr *) *sp;
*bp = stk_ptr[15];
# endif
#elif defined(__mips__)
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.gregs[31];
*bp = ucontext->uc_mcontext.gregs[30];
*sp = ucontext->uc_mcontext.gregs[29];
#else
# error "Unsupported arch"
#endif
}
void AsanPlatformThreadInit() {
}
#if !SANITIZER_ANDROID
void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
ucontext_t *ucp = (ucontext_t*)context;
*stack = (uptr)ucp->uc_stack.ss_sp;
*ssize = ucp->uc_stack.ss_size;
}
#else
void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
UNIMPLEMENTED();
}
#endif
void *AsanDlSymNext(const char *sym) {
return dlsym(RTLD_NEXT, sym);
}
}
#endif // SANITIZER_FREEBSD || SANITIZER_LINUX