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129 lines
4.8 KiB
C
129 lines
4.8 KiB
C
/* Bounded-pointer checking macros for C.
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Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Greg McGary <greg@mcgary.org>
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _bp_checks_h_
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#define _bp_checks_h_ 1
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#if __BOUNDED_POINTERS__
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# define BOUNDS_VIOLATED (__builtin_trap (), 0)
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/* Verify that pointer's value >= low. Return pointer value. */
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# define CHECK_BOUNDS_LOW(ARG) \
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(((__ptrvalue (ARG) < __ptrlow (ARG)) && BOUNDS_VIOLATED), \
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__ptrvalue (ARG))
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/* Verify that pointer's value < high. Return pointer value. */
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# define CHECK_BOUNDS_HIGH(ARG) \
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(((__ptrvalue (ARG) > __ptrhigh (ARG)) && BOUNDS_VIOLATED), \
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__ptrvalue (ARG))
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# define _CHECK_N(ARG, N, COND) \
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(((COND) \
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&& (__ptrvalue (ARG) < __ptrlow (ARG) \
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|| __ptrvalue (ARG) + (N) > __ptrhigh (ARG)) \
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&& BOUNDS_VIOLATED), \
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__ptrvalue (ARG))
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extern void *__unbounded __ubp_memchr (const void *__unbounded, int, unsigned);
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# define _CHECK_STRING(ARG, COND) \
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(((COND) \
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&& (__ptrvalue (ARG) < __ptrlow (ARG) \
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|| !__ubp_memchr (__ptrvalue (ARG), '\0', \
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(__ptrhigh (ARG) - __ptrvalue (ARG)))) \
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&& BOUNDS_VIOLATED), \
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__ptrvalue (ARG))
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/* Check bounds of a pointer seated to an array of N objects. */
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# define CHECK_N(ARG, N) _CHECK_N ((ARG), (N), 1)
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/* Same as CHECK_N, but tolerate ARG == NULL. */
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# define CHECK_N_NULL_OK(ARG, N) _CHECK_N ((ARG), (N), __ptrvalue (ARG))
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/* Check bounds of a pointer seated to a single object. */
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# define CHECK_1(ARG) CHECK_N ((ARG), 1)
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/* Same as CHECK_1, but tolerate ARG == NULL. */
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# define CHECK_1_NULL_OK(ARG) CHECK_N_NULL_OK ((ARG), 1)
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/* Check for NUL-terminator within string's bounds. */
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# define CHECK_STRING(ARG) _CHECK_STRING ((ARG), 1)
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/* Same as CHECK_STRING, but tolerate ARG == NULL. */
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# define CHECK_STRING_NULL_OK(ARG) _CHECK_STRING ((ARG), __ptrvalue (ARG))
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/* Check bounds of signal syscall args with type sigset_t. */
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# define CHECK_SIGSET(SET) CHECK_N ((SET), _NSIG / (8 * sizeof *(SET)))
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/* Same as CHECK_SIGSET, but tolerate SET == NULL. */
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# define CHECK_SIGSET_NULL_OK(SET) CHECK_N_NULL_OK ((SET), _NSIG / (8 * sizeof *(SET)))
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# if defined (_IOC_SIZESHIFT) && defined (_IOC_SIZEBITS)
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/* Extract the size of the ioctl data and check its bounds. */
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# define CHECK_IOCTL(ARG, CMD) \
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CHECK_N ((const char *) (ARG), \
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(((CMD) >> _IOC_SIZESHIFT) & ((1 << _IOC_SIZEBITS) - 1)))
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# else
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/* We don't know the size of the ioctl data, so the best we can do
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is check that the first byte is within bounds. */
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# define CHECK_IOCTL(ARG, CMD) CHECK_1 ((const char *) ARG)
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# endif
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/* Check bounds of `struct flock *' for the locking fcntl commands. */
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# define CHECK_FCNTL(ARG, CMD) \
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(((CMD) == F_GETLK || (CMD) == F_SETLK || (CMD) == F_SETLKW) \
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? CHECK_1 ((struct flock *) ARG) : (unsigned long) (ARG))
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/* Check bounds of an array of mincore residency-status flags that
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cover a region of NBYTES. Such a vector occupies one byte per page
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of memory. */
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# define CHECK_N_PAGES(ARG, NBYTES) \
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({ int _page_size_ = sysconf (_SC_PAGE_SIZE); \
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CHECK_N ((const char *) (ARG), \
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((NBYTES) + _page_size_ - 1) / _page_size_); })
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/* Return a bounded pointer with value PTR that satisfies CHECK_N (PTR, N). */
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# define BOUNDED_N(PTR, N) \
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({ __typeof (PTR) __bounded _p_; \
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__ptrvalue _p_ = __ptrlow _p_ = __ptrvalue (PTR); \
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__ptrhigh _p_ = __ptrvalue _p_ + (N); \
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_p_; })
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#else /* !__BOUNDED_POINTERS__ */
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/* Do nothing if not compiling with -fbounded-pointers. */
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# define BOUNDS_VIOLATED
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# define CHECK_BOUNDS_LOW(ARG) (ARG)
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# define CHECK_BOUNDS_HIGH(ARG) (ARG)
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# define CHECK_1(ARG) (ARG)
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# define CHECK_1_NULL_OK(ARG) (ARG)
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# define CHECK_N(ARG, N) (ARG)
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# define CHECK_N_NULL_OK(ARG, N) (ARG)
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# define CHECK_STRING(ARG) (ARG)
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# define CHECK_SIGSET(SET) (SET)
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# define CHECK_SIGSET_NULL_OK(SET) (SET)
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# define CHECK_IOCTL(ARG, CMD) (ARG)
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# define CHECK_FCNTL(ARG, CMD) (ARG)
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# define CHECK_N_PAGES(ARG, NBYTES) (ARG)
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# define BOUNDED_N(PTR, N) (PTR)
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#endif /* !__BOUNDED_POINTERS__ */
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#define BOUNDED_1(PTR) BOUNDED_N (PTR, 1)
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#endif /* _bp_checks_h_ */
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