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d755bba40f
Fix BZ #15305. On kernel versions earlier than 2.6.29, the Linux kernel exported a sysctl called restrict_chown for xfs, which could be used to allow chown to users other than the owner. 2.6.29 removed this support, causing the open_not_cancel_2 to fail and thus modify errno. The fix is to save and restore errno so that the caller sees it as unmodified. Additionally, since the code to check the sysctl is not useful on newer kernels, we add an ifdef so that in future the code block gets rmeoved completely.
230 lines
7.9 KiB
C
230 lines
7.9 KiB
C
/* Set flags signalling availability of kernel features based on given
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kernel version number.
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Copyright (C) 1999-2013 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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<http://www.gnu.org/licenses/>. */
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/* This file must not contain any C code. At least it must be protected
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to allow using the file also in assembler files. */
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#ifndef __LINUX_KERNEL_VERSION
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/* We assume the worst; all kernels should be supported. */
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# define __LINUX_KERNEL_VERSION 0
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#endif
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/* We assume for __LINUX_KERNEL_VERSION the same encoding used in
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linux/version.h. I.e., the major, minor, and subminor all get a
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byte with the major number being in the highest byte. This means
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we can do numeric comparisons.
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In the following we will define certain symbols depending on
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whether the describes kernel feature is available in the kernel
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version given by __LINUX_KERNEL_VERSION. We are not always exactly
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recording the correct versions in which the features were
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introduced. If somebody cares these values can afterwards be
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corrected. */
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/* The sendfile syscall was introduced in 2.2.0. */
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#define __ASSUME_SENDFILE 1
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/* Linux 2.3.39 introduced IPC64. Except for powerpc. Linux 2.4.0 on
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PPC introduced a correct IPC64. But PowerPC64 does not support a
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separate 64-bit syscall, already 64-bit. */
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#ifndef __powerpc64__
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# define __ASSUME_IPC64 1
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#endif
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/* The changed st_ino field appeared in 2.4.0-test6. However, SH is lame,
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and still does not have a 64-bit inode field. */
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#ifndef __sh__
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# define __ASSUME_ST_INO_64_BIT 1
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#endif
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/* The getdents64 syscall was introduced in 2.4.0-test7 (but later for
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MIPS n32). */
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#define __ASSUME_GETDENTS64_SYSCALL 1
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/* The statfs64 syscalls are available in 2.5.74 (but not for alpha). */
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#define __ASSUME_STATFS64 1
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/* The utimes syscall has been available for some architectures
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forever. For x86 it was introduced after 2.5.75, for x86-64,
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ppc, and ppc64 it was introduced in 2.6.0-test3, for s390 it was
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introduced in 2.6.21-rc5. */
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#if defined __sparc__ \
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|| defined __i386__ \
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|| defined __x86_64__ \
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|| defined __powerpc__ \
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|| defined __sh__ \
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|| (defined __s390__ && __LINUX_KERNEL_VERSION >= 0x020616)
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# define __ASSUME_UTIMES 1
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#endif
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/* pselect/ppoll were introduced just after 2.6.16-rc1. Due to the way
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the kernel versions are advertised we can only rely on 2.6.17 to have
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the code. On x86_64 and SH this appeared first in 2.6.19-rc1,
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on ia64 in 2.6.22-rc1. */
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#if __LINUX_KERNEL_VERSION >= 0x020611 \
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&& ((!defined __x86_64__ && !defined __sh__) \
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|| (__LINUX_KERNEL_VERSION >= 0x020613 \
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&& (defined __x86_64__ || defined __sh__)))
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# define __ASSUME_PSELECT 1
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# define __ASSUME_PPOLL 1
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#endif
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/* The *at syscalls were introduced just after 2.6.16-rc1. Due to the way the
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kernel versions are advertised we can only rely on 2.6.17 to have
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the code. On PPC they were introduced in 2.6.17-rc1,
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on SH in 2.6.19-rc1. */
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#if __LINUX_KERNEL_VERSION >= 0x020611 \
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&& (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
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# define __ASSUME_ATFCTS 1
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#endif
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/* Support for inter-process robust mutexes was added in 2.6.17. */
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#if __LINUX_KERNEL_VERSION >= 0x020611 \
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&& (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
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# define __ASSUME_SET_ROBUST_LIST 1
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#endif
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/* Pessimistically assume that 2.6.18 introduced real handling of
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large numbers of requests to readv and writev and that we don't
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need a fallback. It likely worked for much longer. */
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#if __LINUX_KERNEL_VERSION >= 0x020612
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# define __ASSUME_COMPLETE_READV_WRITEV 1
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#endif
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/* Support for PI futexes was added in 2.6.18. */
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#if __LINUX_KERNEL_VERSION >= 0x020612
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# define __ASSUME_FUTEX_LOCK_PI 1
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#endif
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/* Support for utimensat syscall was added in 2.6.22, on SH
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only after 2.6.22-rc1. */
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#if __LINUX_KERNEL_VERSION >= 0x020616 \
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&& (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020617)
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# define __ASSUME_UTIMENSAT 1
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#endif
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/* Support for private futexes was added in 2.6.22. */
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#if __LINUX_KERNEL_VERSION >= 0x020616
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# define __ASSUME_PRIVATE_FUTEX 1
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#endif
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/* Support for fallocate was added in 2.6.23, on s390
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only after 2.6.23-rc1. */
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#if __LINUX_KERNEL_VERSION >= 0x020617 \
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&& (!defined __s390__ || __LINUX_KERNEL_VERSION >= 0x020618)
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# define __ASSUME_FALLOCATE 1
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#endif
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/* Support for various CLOEXEC and NONBLOCK flags was added for x86,
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x86-64, PPC, IA-64, SPARC< and S390 in 2.6.23. */
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#if __LINUX_KERNEL_VERSION >= 0x020617 \
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&& (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
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|| defined __sparc__ || defined __s390__)
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# define __ASSUME_O_CLOEXEC 1
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#endif
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/* From 2.6.23 onwards the value of ARG_MAX depends on the stack
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size. */
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#define __LINUX_ARG_MAX_STACK_BASED_MIN_KERNEL 0x020617
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#if __LINUX_KERNEL_VERSION >= __LINUX_ARG_MAX_STACK_BASED_MIN_KERNEL
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# define __ASSUME_ARG_MAX_STACK_BASED 1
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#endif
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/* Support for ADJ_OFFSET_SS_READ was added in 2.6.24. */
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#if __LINUX_KERNEL_VERSION >= 0x020618
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# define __ASSUME_ADJ_OFFSET_SS_READ 1
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#endif
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/* Support for various CLOEXEC and NONBLOCK flags was added for x86,
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x86-64, PPC, IA-64, and SPARC in 2.6.27. */
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#if __LINUX_KERNEL_VERSION >= 0x02061b \
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&& (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
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|| defined __sparc__ || defined __s390__)
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# define __ASSUME_SOCK_CLOEXEC 1
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# define __ASSUME_IN_NONBLOCK 1
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# define __ASSUME_PIPE2 1
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# define __ASSUME_EVENTFD2 1
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# define __ASSUME_SIGNALFD4 1
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# define __ASSUME_DUP3 1
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#endif
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/* Support for the accept4 syscall was added in 2.6.28. */
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#if __LINUX_KERNEL_VERSION >= 0x02061c \
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&& (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
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|| defined __sparc__ || defined __s390__)
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# define __ASSUME_ACCEPT4 1
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#endif
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/* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29. */
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#if __LINUX_KERNEL_VERSION >= 0x02061d
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# define __ASSUME_FUTEX_CLOCK_REALTIME 1
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#endif
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/* Support for the AT_RANDOM auxiliary vector entry was added in 2.6.29. */
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#if __LINUX_KERNEL_VERSION >= 0x02061d
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# define __ASSUME_AT_RANDOM 1
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#endif
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/* Support for preadv and pwritev was added in 2.6.30. */
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#if __LINUX_KERNEL_VERSION >= 0x02061e
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# define __ASSUME_PREADV 1
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# define __ASSUME_PWRITEV 1
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#endif
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/* Support for FUTEX_*_REQUEUE_PI was added in 2.6.31. */
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#if __LINUX_KERNEL_VERSION >= 0x02061f
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# define __ASSUME_REQUEUE_PI 1
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#endif
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/* Support for F_GETOWN_EX was introduced in 2.6.32. */
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#if __LINUX_KERNEL_VERSION >= 0x020620
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# define __ASSUME_F_GETOWN_EX 1
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#endif
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/* Support for the recvmmsg syscall was added in 2.6.33. */
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#if __LINUX_KERNEL_VERSION >= 0x020621
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# define __ASSUME_RECVMMSG 1
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#endif
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/* statfs fills in f_flags since 2.6.36. */
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#if __LINUX_KERNEL_VERSION >= 0x020624
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# define __ASSUME_STATFS_F_FLAGS 1
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#endif
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/* prlimit64 is available in 2.6.36. */
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#if __LINUX_KERNEL_VERSION >= 0x020624
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# define __ASSUME_PRLIMIT64 1
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#endif
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/* sendmmsg is available in 2.6.39. */
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#if __LINUX_KERNEL_VERSION >= 0x020627
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# define __ASSUME_SENDMMSG 1
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#endif
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/* getcpu is a syscall for x86-64 since 3.1. */
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#if defined __x86_64__ && __LINUX_KERNEL_VERSION >= 0x030100
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# define __ASSUME_GETCPU_SYSCALL 1
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#endif
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/* 2.6.29 removed the XFS restricted_chown sysctl, so it is pointless looking
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for it in newer kernels. */
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#if __LINUX_KERNEL_VERSION >= 0x02061d
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# define __ASSUME_XFS_RESTRICTED_CHOWN 1
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#endif
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