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26492c0a14
This change continues the improvements to compile-time out of bounds checking by decorating more APIs with either attribute access, or by explicitly providing the array bound in APIs such as tmpnam() that expect arrays of some minimum size as arguments. (The latter feature is new in GCC 11.) The only effects of the attribute and/or the array bound is to check and diagnose calls to the functions that fail to provide a sufficient number of elements, and the definitions of the functions that access elements outside the specified bounds. (There is no interplay with _FORTIFY_SOURCE here yet.) Tested with GCC 7 through 11 on x86_64-linux.
86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
/* Checking macros for poll functions.
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Copyright (C) 2012-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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#ifndef _SYS_POLL_H
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# error "Never include <bits/poll2.h> directly; use <sys/poll.h> instead."
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#endif
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__BEGIN_DECLS
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extern int __REDIRECT (__poll_alias, (struct pollfd *__fds, nfds_t __nfds,
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int __timeout), poll);
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extern int __poll_chk (struct pollfd *__fds, nfds_t __nfds, int __timeout,
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__SIZE_TYPE__ __fdslen)
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__attr_access ((__write_only__, 1, 2));
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extern int __REDIRECT (__poll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
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int __timeout, __SIZE_TYPE__ __fdslen),
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__poll_chk)
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__warnattr ("poll called with fds buffer too small file nfds entries");
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__fortify_function __attr_access ((__write_only__, 1, 2)) int
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poll (struct pollfd *__fds, nfds_t __nfds, int __timeout)
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{
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if (__glibc_objsize (__fds) != (__SIZE_TYPE__) -1)
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{
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if (! __builtin_constant_p (__nfds))
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return __poll_chk (__fds, __nfds, __timeout, __glibc_objsize (__fds));
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else if (__glibc_objsize (__fds) / sizeof (*__fds) < __nfds)
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return __poll_chk_warn (__fds, __nfds, __timeout,
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__glibc_objsize (__fds));
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}
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return __poll_alias (__fds, __nfds, __timeout);
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}
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#ifdef __USE_GNU
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extern int __REDIRECT (__ppoll_alias, (struct pollfd *__fds, nfds_t __nfds,
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const struct timespec *__timeout,
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const __sigset_t *__ss), ppoll);
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extern int __ppoll_chk (struct pollfd *__fds, nfds_t __nfds,
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const struct timespec *__timeout,
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const __sigset_t *__ss, __SIZE_TYPE__ __fdslen)
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__attr_access ((__write_only__, 1, 2));
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extern int __REDIRECT (__ppoll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
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const struct timespec *__timeout,
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const __sigset_t *__ss,
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__SIZE_TYPE__ __fdslen),
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__ppoll_chk)
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__warnattr ("ppoll called with fds buffer too small file nfds entries");
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__fortify_function __attr_access ((__write_only__, 1, 2)) int
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ppoll (struct pollfd *__fds, nfds_t __nfds, const struct timespec *__timeout,
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const __sigset_t *__ss)
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{
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if (__glibc_objsize (__fds) != (__SIZE_TYPE__) -1)
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{
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if (! __builtin_constant_p (__nfds))
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return __ppoll_chk (__fds, __nfds, __timeout, __ss,
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__glibc_objsize (__fds));
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else if (__glibc_objsize (__fds) / sizeof (*__fds) < __nfds)
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return __ppoll_chk_warn (__fds, __nfds, __timeout, __ss,
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__glibc_objsize (__fds));
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}
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return __ppoll_alias (__fds, __nfds, __timeout, __ss);
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}
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#endif
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__END_DECLS
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