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01db744b4a
The pattern for several of the architectures is for ffi_call_int to stack-allocate some arguments + the registers, and then ffi_call_$ARCH will pop the top of that structure into registers, and then adjust the stack pointer such that the alloca'd buffer _becomes_ the stack-passed arguments for the function being called. If libffi is compiled with ASAN, then there will be a redzone inserted after the alloca'd buffer which is marked as poisoned. This redzone appears beyond the end of $sp upon entry to the called function. If the called function does anything to use this stack memory, ASAN will notice that it's poisoned and report an error. This commit fixes the situation (on the architectures that I have access to) disabling instrumentation for ffi_call_int; that means there will be no alloca redzone left on the shadow-stack.
202 lines
5.8 KiB
C
202 lines
5.8 KiB
C
/* -----------------------------------------------------------------------
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ffi_common.h - Copyright (C) 2011, 2012, 2013 Anthony Green
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Copyright (C) 2007 Free Software Foundation, Inc
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Copyright (c) 1996 Red Hat, Inc.
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Common internal definitions and macros. Only necessary for building
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libffi.
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the ``Software''), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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----------------------------------------------------------------------- */
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#ifndef FFI_COMMON_H
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#define FFI_COMMON_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <fficonfig.h>
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/* Do not move this. Some versions of AIX are very picky about where
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this is positioned. */
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#ifdef __GNUC__
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# if HAVE_ALLOCA_H
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# include <alloca.h>
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# else
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/* mingw64 defines this already in malloc.h. */
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# ifndef alloca
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# define alloca __builtin_alloca
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# endif
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# endif
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# define MAYBE_UNUSED __attribute__((__unused__))
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# define NORETURN __attribute__((__noreturn__))
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#else
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# define MAYBE_UNUSED
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# define NORETURN
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# if HAVE_ALLOCA_H
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# include <alloca.h>
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# else
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# ifdef _AIX
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# pragma alloca
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# else
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# ifndef alloca /* predefined by HP cc +Olibcalls */
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# ifdef _MSC_VER
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# define alloca _alloca
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# else
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char *alloca ();
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# endif
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# endif
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# endif
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# endif
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#endif
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/* Check for the existence of memcpy. */
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#if STDC_HEADERS
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# include <string.h>
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#else
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# ifndef HAVE_MEMCPY
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# define memcpy(d, s, n) bcopy ((s), (d), (n))
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# endif
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#endif
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#if defined(FFI_DEBUG)
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#include <stdio.h>
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#endif
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#ifndef __SANITIZE_ADDRESS__
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# ifdef __clang__
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# if __has_feature(address_sanitizer)
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# define FFI_ASAN
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# endif
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# endif
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#endif
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#ifdef __SANITIZE_ADDRESS__
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#define FFI_ASAN
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#endif
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#ifdef FFI_ASAN
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#define FFI_ASAN_NO_SANITIZE __attribute__((no_sanitize_address))
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#else
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#define FFI_ASAN_NO_SANITIZE
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#endif
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#ifdef FFI_DEBUG
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NORETURN void ffi_assert(const char *expr, const char *file, int line);
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void ffi_stop_here(void);
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void ffi_type_test(ffi_type *a, const char *file, int line);
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#define FFI_ASSERT(x) ((x) ? (void)0 : ffi_assert(#x, __FILE__,__LINE__))
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#define FFI_ASSERT_AT(x, f, l) ((x) ? 0 : ffi_assert(#x, (f), (l)))
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#define FFI_ASSERT_VALID_TYPE(x) ffi_type_test (x, __FILE__, __LINE__)
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#else
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#define FFI_ASSERT(x)
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#define FFI_ASSERT_AT(x, f, l)
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#define FFI_ASSERT_VALID_TYPE(x)
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#endif
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/* v cast to size_t and aligned up to a multiple of a */
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#define FFI_ALIGN(v, a) (((((size_t) (v))-1) | ((a)-1))+1)
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/* v cast to size_t and aligned down to a multiple of a */
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#define FFI_ALIGN_DOWN(v, a) (((size_t) (v)) & -a)
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/* Perform machine dependent cif processing */
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ffi_status ffi_prep_cif_machdep(ffi_cif *cif);
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ffi_status ffi_prep_cif_machdep_var(ffi_cif *cif,
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unsigned int nfixedargs, unsigned int ntotalargs);
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#if HAVE_LONG_DOUBLE_VARIANT
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/* Used to adjust size/alignment of ffi types. */
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void ffi_prep_types (ffi_abi abi);
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#endif
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/* Used internally, but overridden by some architectures */
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ffi_status ffi_prep_cif_core(ffi_cif *cif,
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ffi_abi abi,
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unsigned int isvariadic,
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unsigned int nfixedargs,
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unsigned int ntotalargs,
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ffi_type *rtype,
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ffi_type **atypes);
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/* Translate a data pointer to a code pointer. Needed for closures on
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some targets. */
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void *ffi_data_to_code_pointer (void *data) FFI_HIDDEN;
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/* The arch code calls this to determine if a given closure has a
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static trampoline. */
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int ffi_tramp_is_present (void *closure) FFI_HIDDEN;
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/* Return a file descriptor of a temporary zero-sized file in a
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writable and executable filesystem. */
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int open_temp_exec_file(void) FFI_HIDDEN;
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/* Extended cif, used in callback from assembly routine */
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typedef struct
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{
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ffi_cif *cif;
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void *rvalue;
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void **avalue;
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} extended_cif;
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/* Terse sized type definitions. */
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#if defined(_MSC_VER) || defined(__sgi) || defined(__SUNPRO_C)
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typedef unsigned char UINT8;
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typedef signed char SINT8;
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typedef unsigned short UINT16;
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typedef signed short SINT16;
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typedef unsigned int UINT32;
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typedef signed int SINT32;
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# ifdef _MSC_VER
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typedef unsigned __int64 UINT64;
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typedef signed __int64 SINT64;
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# else
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# include <inttypes.h>
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typedef uint64_t UINT64;
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typedef int64_t SINT64;
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# endif
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#else
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typedef unsigned int UINT8 __attribute__((__mode__(__QI__)));
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typedef signed int SINT8 __attribute__((__mode__(__QI__)));
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typedef unsigned int UINT16 __attribute__((__mode__(__HI__)));
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typedef signed int SINT16 __attribute__((__mode__(__HI__)));
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typedef unsigned int UINT32 __attribute__((__mode__(__SI__)));
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typedef signed int SINT32 __attribute__((__mode__(__SI__)));
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typedef unsigned int UINT64 __attribute__((__mode__(__DI__)));
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typedef signed int SINT64 __attribute__((__mode__(__DI__)));
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#endif
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typedef float FLOAT32;
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#ifndef __GNUC__
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#define __builtin_expect(x, expected_value) (x)
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#endif
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#define LIKELY(x) __builtin_expect(!!(x),1)
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#define UNLIKELY(x) __builtin_expect((x)!=0,0)
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#ifdef __cplusplus
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}
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#endif
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#endif
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