This is the mail archive of the
glibc-bugs@sourceware.org
mailing list for the glibc project.
[Bug libc/18472] Obsolete syscall wrappers should be compat symbols
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Mon, 14 Dec 2015 22:53:11 +0000
- Subject: [Bug libc/18472] Obsolete syscall wrappers should be compat symbols
- Auto-submitted: auto-generated
- References: <bug-18472-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=18472
--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".
The branch, master has been updated
via eed3e1eb79bcfa9b52609fd875fa2d522e2d6bce (commit)
from 5db0877750f1e2a1983e1f5e43bd0cc68058f684 (commit)
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eed3e1eb79bcfa9b52609fd875fa2d522e2d6bce
commit eed3e1eb79bcfa9b52609fd875fa2d522e2d6bce
Author: Joseph Myers <joseph@codesourcery.com>
Date: Mon Dec 14 22:52:15 2015 +0000
Make obsolete syscall wrappers into compat symbols (bug 18472).
Various Linux kernel syscalls have become obsolete over time.
Specifically, the following are obsolete in all kernel versions
supported by glibc, are not present for architectures more recently
added to the kernel, and as such, the wrapper functions for them
should be compat symbols, not in static libc and not available for new
links with shared libc.
* bdflush: in Linux 2.6, does nothing if present.
* create_module get_kernel_syms query_module: Linux 2.4 module
interface, syscalls not present in Linux 2.6.
* uselib: part of the mechanism for loading a.out shared libraries,
irrelevant with ELF.
This patch adds support for syscalls.list to list syscall aliases of
the form NAME@VERSION:OBSOLETED, with SHLIB_COMPAT conditionals being
generated for such aliases. Those five syscalls are then made into
compat symbols (obsoleted in glibc 2.23, so future ports won't have
these symbols at all), with the header <sys/kdaemon.h> declaring
bdflush being removed. When we move to 3.2 as minimum kernel version,
the same can be done for nfsservctl (removed in Linux 3.1) as well.
Tested for x86_64 and x86 (testsuite, as well as checking that the
symbols in question indeed become compat symbols, that they are indeed
omitted from static libc, and that the generated SHLIB_COMPAT
conditionals look right).
[BZ #18472]
* sysdeps/unix/Makefile ($(objpfx)stub-syscalls.c): Handle entries
for the form NAME@VERSION:OBSOLETED and generate SHLIB_COMPAT
conditionals for them.
* sysdeps/unix/make-syscalls.sh (emit_weak_aliases): Likewise.
* sysdeps/unix/sysv/linux/sys/kdaemon.h: Remove file.
* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Remove
sys/kdaemon.h.
* sysdeps/unix/sysv/linux/syscalls.list (bdflush): Make into
compat-only syscall, obsoleted in glibc 2.23.
(create_module): Likewise.
(get_kernel_syms): Likewise.
(query_module): Likewise.
(uselib): Likewise.
* manual/sysinfo.texi (System Parameters): Do not mention bdflush.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 18 ++++++++++++++++++
NEWS | 7 +++++++
manual/sysinfo.texi | 2 --
sysdeps/unix/Makefile | 14 +++++++++++++-
sysdeps/unix/make-syscalls.sh | 21 ++++++++++++++-------
sysdeps/unix/sysv/linux/Makefile | 2 +-
sysdeps/unix/sysv/linux/sys/kdaemon.h | 32 --------------------------------
sysdeps/unix/sysv/linux/syscalls.list | 10 +++++-----
8 files changed, 58 insertions(+), 48 deletions(-)
delete mode 100644 sysdeps/unix/sysv/linux/sys/kdaemon.h
--
You are receiving this mail because:
You are on the CC list for the bug.