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glibc/io/bits/poll2.h

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Add checking versions of poll and ppoll
2012-01-08 16:55:32 +00:00
/* Checking macros for poll functions.
Update copyright dates with scripts/update-copyrights
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Copyright (C) 2012-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
Replace FSF snail mail address with URLs.
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License along with the GNU C Library; if not, see
Prefer https to http for gnu.org and fsf.org URLs Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
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<https://www.gnu.org/licenses/>. */
Add checking versions of poll and ppoll
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#ifndef _SYS_POLL_H
# error "Never include <bits/poll2.h> directly; use <sys/poll.h> instead."
#endif
bits/poll2.h needs __BEGIN/__END_DECLS
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__BEGIN_DECLS
Add checking versions of poll and ppoll
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extern int __REDIRECT (__poll_alias, (struct pollfd *__fds, nfds_t __nfds,
int __timeout), poll);
extern int __poll_chk (struct pollfd *__fds, nfds_t __nfds, int __timeout,
Annotate additional APIs with GCC attribute access. 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.
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__SIZE_TYPE__ __fdslen)
__attr_access ((__write_only__, 1, 2));
Add checking versions of poll and ppoll
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extern int __REDIRECT (__poll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
int __timeout, __SIZE_TYPE__ __fdslen),
__poll_chk)
__warnattr ("poll called with fds buffer too small file nfds entries");
socket: Improve fortify with clang It improve fortify checks recv, recvfrom, poll, and ppoll. The compile and runtime hecks have similar coverage as with GCC. Checked on aarch64, armhf, x86_64, and i686. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
2024-02-08 18:46:18 +00:00
__fortify_function __fortified_attr_access (__write_only__, 1, 2)
__attribute_overloadable__ int
poll (__fortify_clang_overload_arg (struct pollfd *, ,__fds), nfds_t __nfds,
int __timeout)
__fortify_clang_warning_only_if_bos_lt2 (__nfds, __fds, sizeof (*__fds),
"poll called with fds buffer "
"too small file nfds entries")
Add checking versions of poll and ppoll
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{
Make sure that the fortified function conditionals are constant In _FORTIFY_SOURCE=3, the size expression may be non-constant, resulting in branches in the inline functions remaining intact and causing a tiny overhead. Clang (and in future, gcc) make sure that the -1 case is always safe, i.e. any comparison of the generated expression with (size_t)-1 is always false so that bit is taken care of. The rest is avoidable since we want the _chk variant whenever we have a size expression and it's not -1. Rework the conditionals in a uniform way to clearly indicate two conditions at compile time: - Either the size is unknown (-1) or we know at compile time that the operation length is less than the object size. We can call the original function in this case. It could be that either the length, object size or both are non-constant, but the compiler, through range analysis, is able to fold the *comparison* to a constant. - The size and length are known and the compiler can see at compile time that operation length > object size. This is valid grounds for a warning at compile time, followed by emitting the _chk variant. For everything else, emit the _chk variant. This simplifies most of the fortified function implementations and at the same time, ensures that only one call from _chk or the regular function is emitted. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-10-20 12:42:41 +00:00
return __glibc_fortify (poll, __nfds, sizeof (*__fds),
__glibc_objsize (__fds),
__fds, __nfds, __timeout);
Add checking versions of poll and ppoll
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}
#ifdef __USE_GNU
Linux: Add ppoll fortify symbol for 64 bit time_t (BZ# 29746) Similar to ppoll, the poll.h header needs to redirect the poll call to a proper fortified ppoll with 64 bit time_t support. The implementation is straightforward, just need to add a similar check as __poll_chk and call the 64 bit time_t ppoll version. The debug fortify tests are also extended to cover 64 bit time_t for affected ABIs. Unfortunately it requires an aditional symbol, which makes backport tricky. One possibility is to add a static inline version if compiler supports is and call abort instead of __chk_fail, so fortified version will call __poll64 in the end. Another possibility is to just remove the fortify support for _TIME_BITS=64. Checked on i686-linux-gnu.
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# ifdef __USE_TIME_BITS64
extern int __REDIRECT (__ppoll64_alias, (struct pollfd *__fds, nfds_t __nfds,
const struct timespec *__timeout,
const __sigset_t *__ss), __ppoll64);
extern int __ppoll64_chk (struct pollfd *__fds, nfds_t __nfds,
const struct timespec *__timeout,
const __sigset_t *__ss, __SIZE_TYPE__ __fdslen)
__attr_access ((__write_only__, 1, 2));
extern int __REDIRECT (__ppoll64_chk_warn, (struct pollfd *__fds, nfds_t __n,
const struct timespec *__timeout,
const __sigset_t *__ss,
__SIZE_TYPE__ __fdslen),
__ppoll64_chk)
__warnattr ("ppoll called with fds buffer too small file nfds entries");
socket: Improve fortify with clang It improve fortify checks recv, recvfrom, poll, and ppoll. The compile and runtime hecks have similar coverage as with GCC. Checked on aarch64, armhf, x86_64, and i686. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
2024-02-08 18:46:18 +00:00
__fortify_function __fortified_attr_access (__write_only__, 1, 2)
__attribute_overloadable__ int
ppoll (__fortify_clang_overload_arg (struct pollfd *, ,__fds), nfds_t __nfds,
const struct timespec *__timeout, const __sigset_t *__ss)
__fortify_clang_warning_only_if_bos_lt2 (__nfds, __fds, sizeof (*__fds),
"ppoll called with fds buffer "
"too small file nfds entries")
Linux: Add ppoll fortify symbol for 64 bit time_t (BZ# 29746) Similar to ppoll, the poll.h header needs to redirect the poll call to a proper fortified ppoll with 64 bit time_t support. The implementation is straightforward, just need to add a similar check as __poll_chk and call the 64 bit time_t ppoll version. The debug fortify tests are also extended to cover 64 bit time_t for affected ABIs. Unfortunately it requires an aditional symbol, which makes backport tricky. One possibility is to add a static inline version if compiler supports is and call abort instead of __chk_fail, so fortified version will call __poll64 in the end. Another possibility is to just remove the fortify support for _TIME_BITS=64. Checked on i686-linux-gnu.
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{
return __glibc_fortify (ppoll64, __nfds, sizeof (*__fds),
__glibc_objsize (__fds),
__fds, __nfds, __timeout, __ss);
}
# else
Add checking versions of poll and ppoll
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extern int __REDIRECT (__ppoll_alias, (struct pollfd *__fds, nfds_t __nfds,
const struct timespec *__timeout,
const __sigset_t *__ss), ppoll);
extern int __ppoll_chk (struct pollfd *__fds, nfds_t __nfds,
const struct timespec *__timeout,
Annotate additional APIs with GCC attribute access. 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.
2021-05-06 16:56:25 +00:00
const __sigset_t *__ss, __SIZE_TYPE__ __fdslen)
__attr_access ((__write_only__, 1, 2));
Add checking versions of poll and ppoll
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extern int __REDIRECT (__ppoll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
const struct timespec *__timeout,
const __sigset_t *__ss,
__SIZE_TYPE__ __fdslen),
__ppoll_chk)
__warnattr ("ppoll called with fds buffer too small file nfds entries");
socket: Improve fortify with clang It improve fortify checks recv, recvfrom, poll, and ppoll. The compile and runtime hecks have similar coverage as with GCC. Checked on aarch64, armhf, x86_64, and i686. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
2024-02-08 18:46:18 +00:00
__fortify_function __fortified_attr_access (__write_only__, 1, 2)
__attribute_overloadable__ int
ppoll (__fortify_clang_overload_arg (struct pollfd *, ,__fds), nfds_t __nfds,
const struct timespec *__timeout, const __sigset_t *__ss)
__fortify_clang_warning_only_if_bos_lt2 (__nfds, __fds, sizeof (*__fds),
"ppoll called with fds buffer "
"too small file nfds entries")
Add checking versions of poll and ppoll
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{
Make sure that the fortified function conditionals are constant In _FORTIFY_SOURCE=3, the size expression may be non-constant, resulting in branches in the inline functions remaining intact and causing a tiny overhead. Clang (and in future, gcc) make sure that the -1 case is always safe, i.e. any comparison of the generated expression with (size_t)-1 is always false so that bit is taken care of. The rest is avoidable since we want the _chk variant whenever we have a size expression and it's not -1. Rework the conditionals in a uniform way to clearly indicate two conditions at compile time: - Either the size is unknown (-1) or we know at compile time that the operation length is less than the object size. We can call the original function in this case. It could be that either the length, object size or both are non-constant, but the compiler, through range analysis, is able to fold the *comparison* to a constant. - The size and length are known and the compiler can see at compile time that operation length > object size. This is valid grounds for a warning at compile time, followed by emitting the _chk variant. For everything else, emit the _chk variant. This simplifies most of the fortified function implementations and at the same time, ensures that only one call from _chk or the regular function is emitted. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-10-20 12:42:41 +00:00
return __glibc_fortify (ppoll, __nfds, sizeof (*__fds),
__glibc_objsize (__fds),
__fds, __nfds, __timeout, __ss);
Add checking versions of poll and ppoll
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}
Linux: Add ppoll fortify symbol for 64 bit time_t (BZ# 29746) Similar to ppoll, the poll.h header needs to redirect the poll call to a proper fortified ppoll with 64 bit time_t support. The implementation is straightforward, just need to add a similar check as __poll_chk and call the 64 bit time_t ppoll version. The debug fortify tests are also extended to cover 64 bit time_t for affected ABIs. Unfortunately it requires an aditional symbol, which makes backport tricky. One possibility is to add a static inline version if compiler supports is and call abort instead of __chk_fail, so fortified version will call __poll64 in the end. Another possibility is to just remove the fortify support for _TIME_BITS=64. Checked on i686-linux-gnu.
2022-11-04 19:02:52 +00:00
# endif
Add checking versions of poll and ppoll
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#endif
bits/poll2.h needs __BEGIN/__END_DECLS
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__END_DECLS
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