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//===-- hwasan_interceptors.cpp -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of HWAddressSanitizer.
//
// Interceptors for standard library functions.
//
// FIXME: move as many interceptors as possible into
// sanitizer_common/sanitizer_common_interceptors.h
//===----------------------------------------------------------------------===//
#include "hwasan.h"
#include "hwasan_checks.h"
#include "hwasan_platform_interceptors.h"
#include "hwasan_thread.h"
#include "hwasan_thread_list.h"
#include "interception/interception.h"
#include "sanitizer_common/sanitizer_linux.h"
#include "sanitizer_common/sanitizer_stackdepot.h"
#if !SANITIZER_FUCHSIA
using namespace __hwasan;
# if HWASAN_WITH_INTERCEPTORS
# define COMMON_SYSCALL_PRE_READ_RANGE(p, s) __hwasan_loadN((uptr)p, (uptr)s)
# define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
__hwasan_storeN((uptr)p, (uptr)s)
# define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
do { \
(void)(p); \
(void)(s); \
} while (false)
# define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
do { \
(void)(p); \
(void)(s); \
} while (false)
# include "sanitizer_common/sanitizer_common_syscalls.inc"
# include "sanitizer_common/sanitizer_syscalls_netbsd.inc"
#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
do { \
} while (false)
#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
do { \
(void)(ctx); \
(void)(ptr); \
(void)(size); \
} while (false)
#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
do { \
(void)(ctx); \
(void)(func); \
} while (false)
#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
do { \
(void)(ctx); \
(void)(path); \
} while (false)
#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
do { \
(void)(ctx); \
(void)(fd); \
} while (false)
#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
do { \
(void)(ctx); \
(void)(fd); \
} while (false)
#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
do { \
(void)(ctx); \
(void)(fd); \
(void)(newfd); \
} while (false)
#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
do { \
(void)(ctx); \
(void)(name); \
} while (false)
#define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
do { \
(void)(ctx); \
(void)(thread); \
(void)(name); \
} while (false)
#define COMMON_INTERCEPTOR_BLOCK_REAL(name) \
do { \
(void)(name); \
} while (false)
#define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
do { \
(void)(ctx); \
(void)(to); \
(void)(from); \
(void)(size); \
} while (false)
#define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
do { \
(void)(ctx); \
(void)(to); \
(void)(from); \
(void)(size); \
} while (false)
#define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
do { \
(void)(ctx); \
(void)(block); \
(void)(c); \
(void)(size); \
} while (false)
#define COMMON_INTERCEPTOR_STRERROR() \
do { \
} while (false)
#define COMMON_INTERCEPT_FUNCTION(name) \
do { \
(void)(name); \
} while (false)
#include "sanitizer_common/sanitizer_common_interceptors.inc"
struct ThreadStartArg {
__sanitizer_sigset_t starting_sigset_;
};
static void *HwasanThreadStartFunc(void *arg) {
__hwasan_thread_enter();
ThreadStartArg A = *reinterpret_cast<ThreadStartArg *>(arg);
SetSigProcMask(&A.starting_sigset_, nullptr);
InternalFree(arg);
auto self = GetThreadSelf();
auto args = hwasanThreadArgRetval().GetArgs(self);
void *retval = (*args.routine)(args.arg_retval);
hwasanThreadArgRetval().Finish(self, retval);
return retval;
}
extern "C" {
int pthread_attr_getdetachstate(void *attr, int *v);
}
INTERCEPTOR(int, pthread_create, void *thread, void *attr,
void *(*callback)(void *), void *param) {
EnsureMainThreadIDIsCorrect();
ScopedTaggingDisabler tagging_disabler;
bool detached = [attr]() {
int d = 0;
return attr && !pthread_attr_getdetachstate(attr, &d) && IsStateDetached(d);
}();
ThreadStartArg *A = (ThreadStartArg *)InternalAlloc(sizeof(ThreadStartArg));
ScopedBlockSignals block(&A->starting_sigset_);
// ASAN uses the same approach to disable leaks from pthread_create.
# if CAN_SANITIZE_LEAKS
__lsan::ScopedInterceptorDisabler lsan_disabler;
# endif
int result;
hwasanThreadArgRetval().Create(detached, {callback, param}, [&]() -> uptr {
result = REAL(pthread_create)(thread, attr, &HwasanThreadStartFunc, A);
return result ? 0 : *(uptr *)(thread);
});
if (result != 0)
InternalFree(A);
return result;
}
INTERCEPTOR(int, pthread_join, void *thread, void **retval) {
int result;
hwasanThreadArgRetval().Join((uptr)thread, [&]() {
result = REAL(pthread_join)(thread, retval);
return !result;
});
return result;
}
INTERCEPTOR(int, pthread_detach, void *thread) {
int result;
hwasanThreadArgRetval().Detach((uptr)thread, [&]() {
result = REAL(pthread_detach)(thread);
return !result;
});
return result;
}
INTERCEPTOR(int, pthread_exit, void *retval) {
hwasanThreadArgRetval().Finish(GetThreadSelf(), retval);
return REAL(pthread_exit)(retval);
}
# if SANITIZER_GLIBC
INTERCEPTOR(int, pthread_tryjoin_np, void *thread, void **ret) {
int result;
hwasanThreadArgRetval().Join((uptr)thread, [&]() {
result = REAL(pthread_tryjoin_np)(thread, ret);
return !result;
});
return result;
}
INTERCEPTOR(int, pthread_timedjoin_np, void *thread, void **ret,
const struct timespec *abstime) {
int result;
hwasanThreadArgRetval().Join((uptr)thread, [&]() {
result = REAL(pthread_timedjoin_np)(thread, ret, abstime);
return !result;
});
return result;
}
# endif
DEFINE_REAL_PTHREAD_FUNCTIONS
DEFINE_REAL(int, vfork)
DECLARE_EXTERN_INTERCEPTOR_AND_WRAPPER(int, vfork)
// Get and/or change the set of blocked signals.
extern "C" int sigprocmask(int __how, const __hw_sigset_t *__restrict __set,
__hw_sigset_t *__restrict __oset);
# define SIG_BLOCK 0
# define SIG_SETMASK 2
extern "C" int __sigjmp_save(__hw_sigjmp_buf env, int savemask) {
env[0].__magic = kHwJmpBufMagic;
env[0].__mask_was_saved =
(savemask &&
sigprocmask(SIG_BLOCK, (__hw_sigset_t *)0, &env[0].__saved_mask) == 0);
return 0;
}
static void __attribute__((always_inline))
InternalLongjmp(__hw_register_buf env, int retval) {
# if defined(__aarch64__)
constexpr size_t kSpIndex = 13;
# elif defined(__x86_64__)
constexpr size_t kSpIndex = 6;
# elif SANITIZER_RISCV64
constexpr size_t kSpIndex = 13;
# endif
// Clear all memory tags on the stack between here and where we're going.
unsigned long long stack_pointer = env[kSpIndex];
// The stack pointer should never be tagged, so we don't need to clear the
// tag for this function call.
__hwasan_handle_longjmp((void *)stack_pointer);
// Run code for handling a longjmp.
// Need to use a register that isn't going to be loaded from the environment
// buffer -- hence why we need to specify the register to use.
// Must implement this ourselves, since we don't know the order of registers
// in different libc implementations and many implementations mangle the
// stack pointer so we can't use it without knowing the demangling scheme.
# if defined(__aarch64__)
register long int retval_tmp asm("x1") = retval;
register void *env_address asm("x0") = &env[0];
asm volatile(
"ldp x19, x20, [%0, #0<<3];"
"ldp x21, x22, [%0, #2<<3];"
"ldp x23, x24, [%0, #4<<3];"
"ldp x25, x26, [%0, #6<<3];"
"ldp x27, x28, [%0, #8<<3];"
"ldp x29, x30, [%0, #10<<3];"
"ldp d8, d9, [%0, #14<<3];"
"ldp d10, d11, [%0, #16<<3];"
"ldp d12, d13, [%0, #18<<3];"
"ldp d14, d15, [%0, #20<<3];"
"ldr x5, [%0, #13<<3];"
"mov sp, x5;"
// Return the value requested to return through arguments.
// This should be in x1 given what we requested above.
"cmp %1, #0;"
"mov x0, #1;"
"csel x0, %1, x0, ne;"
"br x30;"
: "+r"(env_address)
: "r"(retval_tmp));
# elif defined(__x86_64__)
register long int retval_tmp asm("%rsi") = retval;
register void *env_address asm("%rdi") = &env[0];
asm volatile(
// Restore registers.
"mov (0*8)(%0),%%rbx;"
"mov (1*8)(%0),%%rbp;"
"mov (2*8)(%0),%%r12;"
"mov (3*8)(%0),%%r13;"
"mov (4*8)(%0),%%r14;"
"mov (5*8)(%0),%%r15;"
"mov (6*8)(%0),%%rsp;"
"mov (7*8)(%0),%%rdx;"
// Return 1 if retval is 0.
"mov $1,%%rax;"
"test %1,%1;"
"cmovnz %1,%%rax;"
"jmp *%%rdx;" ::"r"(env_address),
"r"(retval_tmp));
# elif SANITIZER_RISCV64
register long int retval_tmp asm("x11") = retval;
register void *env_address asm("x10") = &env[0];
asm volatile(
"ld ra, 0<<3(%0);"
"ld s0, 1<<3(%0);"
"ld s1, 2<<3(%0);"
"ld s2, 3<<3(%0);"
"ld s3, 4<<3(%0);"
"ld s4, 5<<3(%0);"
"ld s5, 6<<3(%0);"
"ld s6, 7<<3(%0);"
"ld s7, 8<<3(%0);"
"ld s8, 9<<3(%0);"
"ld s9, 10<<3(%0);"
"ld s10, 11<<3(%0);"
"ld s11, 12<<3(%0);"
# if __riscv_float_abi_double
"fld fs0, 14<<3(%0);"
"fld fs1, 15<<3(%0);"
"fld fs2, 16<<3(%0);"
"fld fs3, 17<<3(%0);"
"fld fs4, 18<<3(%0);"
"fld fs5, 19<<3(%0);"
"fld fs6, 20<<3(%0);"
"fld fs7, 21<<3(%0);"
"fld fs8, 22<<3(%0);"
"fld fs9, 23<<3(%0);"
"fld fs10, 24<<3(%0);"
"fld fs11, 25<<3(%0);"
# elif __riscv_float_abi_soft
# else
# error "Unsupported case"
# endif
"ld a4, 13<<3(%0);"
"mv sp, a4;"
// Return the value requested to return through arguments.
// This should be in x11 given what we requested above.
"seqz a0, %1;"
"add a0, a0, %1;"
"ret;"
: "+r"(env_address)
: "r"(retval_tmp));
# endif
}
INTERCEPTOR(void, siglongjmp, __hw_sigjmp_buf env, int val) {
if (env[0].__magic != kHwJmpBufMagic) {
Printf(
"WARNING: Unexpected bad jmp_buf. Either setjmp was not called or "
"there is a bug in HWASan.\n");
return REAL(siglongjmp)(env, val);
}
if (env[0].__mask_was_saved)
// Restore the saved signal mask.
(void)sigprocmask(SIG_SETMASK, &env[0].__saved_mask, (__hw_sigset_t *)0);
InternalLongjmp(env[0].__jmpbuf, val);
}
// Required since glibc libpthread calls __libc_longjmp on pthread_exit, and
// _setjmp on start_thread. Hence we have to intercept the longjmp on
// pthread_exit so the __hw_jmp_buf order matches.
INTERCEPTOR(void, __libc_longjmp, __hw_jmp_buf env, int val) {
if (env[0].__magic != kHwJmpBufMagic)
return REAL(__libc_longjmp)(env, val);
InternalLongjmp(env[0].__jmpbuf, val);
}
INTERCEPTOR(void, longjmp, __hw_jmp_buf env, int val) {
if (env[0].__magic != kHwJmpBufMagic) {
Printf(
"WARNING: Unexpected bad jmp_buf. Either setjmp was not called or "
"there is a bug in HWASan.\n");
return REAL(longjmp)(env, val);
}
InternalLongjmp(env[0].__jmpbuf, val);
}
# undef SIG_BLOCK
# undef SIG_SETMASK
# endif // HWASAN_WITH_INTERCEPTORS
namespace __hwasan {
int OnExit() {
if (CAN_SANITIZE_LEAKS && common_flags()->detect_leaks &&
__lsan::HasReportedLeaks()) {
return common_flags()->exitcode;
}
// FIXME: ask frontend whether we need to return failure.
return 0;
}
} // namespace __hwasan
namespace __hwasan {
void InitializeInterceptors() {
static int inited = 0;
CHECK_EQ(inited, 0);
(void)(InitializeCommonInterceptors);
(void)(read_iovec);
(void)(write_iovec);
# if HWASAN_WITH_INTERCEPTORS
# if defined(__linux__)
INTERCEPT_FUNCTION(__libc_longjmp);
INTERCEPT_FUNCTION(longjmp);
INTERCEPT_FUNCTION(siglongjmp);
INTERCEPT_FUNCTION(vfork);
# endif // __linux__
INTERCEPT_FUNCTION(pthread_create);
INTERCEPT_FUNCTION(pthread_join);
INTERCEPT_FUNCTION(pthread_detach);
INTERCEPT_FUNCTION(pthread_exit);
# if SANITIZER_GLIBC
INTERCEPT_FUNCTION(pthread_tryjoin_np);
INTERCEPT_FUNCTION(pthread_timedjoin_np);
# endif
# endif
inited = 1;
}
} // namespace __hwasan
#endif // #if !SANITIZER_FUCHSIA