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Support and use mixed compat/non-compat aliases in syscalls.list.

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This patch enables syscalls.list entries to specify both compat and
non-compat symbol versions for the same syscall definition, making use
of this for setrlimit / chown / lchown where the inability to specify
such aliases showed up in the course of work on bug 14138.

The change to make-syscalls.sh is minimal: adding a SHARED conditional
on the compat_symbol calls.  It remains the case that if a compat
symbol version is specified, the syscall is only built for the shared
library at all if an explicit symbol version is given for a non-compat
symbol (so it's necessary to specify "lchown@@GLIBC_2.0
chown@GLIBC_2.0" rather than just "lchown chown@GLIBC_2.0").  It also
remains the case, as already commented in make-syscalls.sh, that no
SHLIB_COMPAT conditionals are generated, so there would be problems if
the same syscalls.list file, with compat symbols, were used for both
configurations that should have those symbols and configurations for
which they should be conditioned out with SHLIB_COMPAT.

Tested for x86.

	* sysdeps/unix/make-syscalls.sh (emit_weak_aliases): Condition
	compat_symbol calls on [SHARED].
	* sysdeps/unix/sysv/linux/powerpc/lchown.S: Remove file.
	* sysdeps/unix/sysv/linux/i386/syscalls.list (oldsetrlimit):
	Remove.
	(setrlimit): Add setrlimit@GLIBC_2.0 alias.
	* sysdeps/unix/sysv/linux/m68k/m680x0/syscalls.list
	(oldsetrlimit): Remove.
	(setrlimit): Add setrlimit@GLIBC_2.0 alias.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/syscalls.list
	(lchown): New syscall entry.
	(oldsetrlimit): Remove.
	(setrlimit): Add setrlimit@GLIBC_2.0 alias.
	* sysdeps/unix/sysv/linux/s390/s390-32/syscalls.list
	(oldsetrlimit): Remove.
	(setrlimit): Add setrlimit@GLIBC_2.0 alias.
This commit is contained in:
Joseph Myers 2014-10-06 22:58:59 +00:00
parent abb280f799
commit f7b425175c
7 changed files with 23 additions and 47 deletions
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17
ChangeLog
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@ -1,5 +1,22 @@
2014-10-06 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/make-syscalls.sh (emit_weak_aliases): Condition
compat_symbol calls on [SHARED].
* sysdeps/unix/sysv/linux/powerpc/lchown.S: Remove file.
* sysdeps/unix/sysv/linux/i386/syscalls.list (oldsetrlimit):
Remove.
(setrlimit): Add setrlimit@GLIBC_2.0 alias.
* sysdeps/unix/sysv/linux/m68k/m680x0/syscalls.list
(oldsetrlimit): Remove.
(setrlimit): Add setrlimit@GLIBC_2.0 alias.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/syscalls.list
(lchown): New syscall entry.
(oldsetrlimit): Remove.
(setrlimit): Add setrlimit@GLIBC_2.0 alias.
* sysdeps/unix/sysv/linux/s390/s390-32/syscalls.list
(oldsetrlimit): Remove.
(setrlimit): Add setrlimit@GLIBC_2.0 alias.
[BZ #14138]
* sysdeps/unix/sysv/linux/arm/fchown.c: Remove file.
* sysdeps/unix/sysv/linux/arm/lchown.c: Likewise.

2
sysdeps/unix/make-syscalls.sh
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@ -113,7 +113,7 @@ emit_weak_aliases()
*@*)
base=`echo $name | sed 's/@.*//'`
ver=`echo $name | sed 's/.*@//;s/\./_/g'`
echo " echo '#ifndef NOT_IN_libc'; \\"
echo " echo '#if defined SHARED && !defined NOT_IN_libc'; \\"
if test -z "$vcount" ; then
source=$strong
vcount=1

3
sysdeps/unix/sysv/linux/i386/syscalls.list
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@ -4,8 +4,7 @@ modify_ldt EXTRA modify_ldt i:ipi __modify_ldt modify_ldt
vm86old EXTRA vm86old i:p __vm86old vm86@GLIBC_2.0
vm86 - vm86 i:ip __vm86 vm86@@GLIBC_2.3.4
oldgetrlimit EXTRA getrlimit i:ip __old_getrlimit getrlimit@GLIBC_2.0
oldsetrlimit EXTRA setrlimit i:ip __old_setrlimit setrlimit@GLIBC_2.0
setrlimit - setrlimit i:ip __setrlimit setrlimit@@GLIBC_2.2
setrlimit - setrlimit i:ip __setrlimit setrlimit@GLIBC_2.0 setrlimit@@GLIBC_2.2
waitpid - waitpid Ci:ipi __waitpid waitpid __libc_waitpid
prlimit64 EXTRA prlimit64 i:iipp prlimit64

3
sysdeps/unix/sysv/linux/m68k/m680x0/syscalls.list
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@ -1,5 +1,4 @@
# File name Caller Syscall name Args Strong name Weak names
oldgetrlimit EXTRA getrlimit i:ip __old_getrlimit getrlimit@GLIBC_2.0
oldsetrlimit EXTRA setrlimit i:ip __old_setrlimit setrlimit@GLIBC_2.0
setrlimit - setrlimit i:ip __setrlimit setrlimit@@GLIBC_2.2
setrlimit - setrlimit i:ip __setrlimit setrlimit@GLIBC_2.0 setrlimit@@GLIBC_2.2

38
sysdeps/unix/sysv/linux/powerpc/lchown.S
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@ -1,38 +0,0 @@
/* lchown system call.
Copyright (C) 1998-2014 Free Software Foundation, Inc.
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
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* Some old kernel headers call lchown() 'chown'. The number is
the same. */
#include <sysdep.h>
#ifdef __NR_lchown
PSEUDO (__lchown, lchown, 3)
#else
PSEUDO (__lchown, chown, 3)
#endif
ret
PSEUDO_END(__lchown)
weak_alias (__lchown, lchown)
#ifdef SHARED
#include <shlib-compat.h>
# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
compat_symbol (libc, __lchown, chown, GLIBC_2_0)
# endif
#endif

4
sysdeps/unix/sysv/linux/powerpc/powerpc32/syscalls.list
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@ -1,11 +1,11 @@
# File name Caller Syscall name # args Strong name Weak names
chown - chown i:sii __chown chown@@GLIBC_2.1
lchown - lchown i:sii __lchown lchown@@GLIBC_2.0 chown@GLIBC_2.0
# System calls with wrappers.
oldgetrlimit EXTRA getrlimit i:ip __old_getrlimit getrlimit@GLIBC_2.0
oldsetrlimit EXTRA setrlimit i:ip __old_setrlimit setrlimit@GLIBC_2.0
setrlimit - setrlimit i:ip __setrlimit setrlimit@@GLIBC_2.2
setrlimit - setrlimit i:ip __setrlimit setrlimit@GLIBC_2.0 setrlimit@@GLIBC_2.2
# Due to 64bit alignment there is a dummy second parameter
readahead - readahead i:iiiii __readahead readahead

3
sysdeps/unix/sysv/linux/s390/s390-32/syscalls.list
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@ -1,8 +1,7 @@
# File name Caller Syscall name Args Strong name Weak names
oldgetrlimit EXTRA getrlimit i:ip __old_getrlimit getrlimit@GLIBC_2.0
oldsetrlimit EXTRA setrlimit i:ip __old_setrlimit setrlimit@GLIBC_2.0
setrlimit - setrlimit i:ip __setrlimit setrlimit@@GLIBC_2.2
setrlimit - setrlimit i:ip __setrlimit setrlimit@GLIBC_2.0 setrlimit@@GLIBC_2.2
prlimit64 EXTRA prlimit64 i:iipp prlimit64
fanotify_mark EXTRA fanotify_mark i:iiiiis fanotify_mark