Fix concurrent changes on nscd aware files (BZ #23178)

As indicated by BZ#23178, concurrent access on some files read by nscd
may result non expected data send through service requisition.  This is
due 'sendfile' Linux implementation where for sockets with zero-copy
support, callers must ensure the transferred portions of the the file
reffered by input file descriptor remain unmodified until the reader
on the other end of socket has consumed the transferred data.

I could not find any explicit documentation stating this behaviour on
Linux kernel documentation.  However man-pages sendfile entry [1] states
in NOTES the aforementioned remark.  It was initially pushed on man-pages
with an explicit testcase [2] that shows changing the file used in
'sendfile' call prior the socket input data consumption results in
previous data being lost.

From commit message it stated on tested Linux version (3.15) only TCP
socket showed this issues, however on recent kernels (4.4) I noticed the
same behaviour for local sockets as well.

Since sendfile on HURD is a read/write operation and the underlying
issue on Linux, the straightforward fix is just remove sendfile use
altogether.  I am really skeptical it is hitting some hotstop (there
are indication over internet that sendfile is helpfull only for large
files, more than 10kb) here to justify that extra code complexity or
to pursuit other possible fix (through memory or file locks for
instance, which I am not sure it is doable).

Checked on x86_64-linux-gnu.

	[BZ #23178]
	* nscd/nscd-client.h (sendfileall): Remove prototype.
	* nscd/connections.c [HAVE_SENDFILE] (sendfileall): Remove function.
	(handle_request): Use writeall instead of sendfileall.
	* nscd/aicache.c (addhstaiX): Likewise.
	* nscd/grpcache.c (cache_addgr): Likewise.
	* nscd/hstcache.c (cache_addhst): Likewise.
	* nscd/initgrcache.c (addinitgroupsX): Likewise.
	* nscd/netgroupcache.c (addgetnetgrentX, addinnetgrX): Likewise.
	* nscd/pwdcache.c (cache_addpw): Likewise.
	* nscd/servicescache.c (cache_addserv): Likewise.
	* sysdeps/unix/sysv/linux/Makefile [$(subdir) == nscd]
	(sysdep-CFLAGS): Remove -DHAVE_SENDFILE.
	* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_SENDFILE):
	Remove define.

[1] http://man7.org/linux/man-pages/man2/sendfile.2.html
[2] https://github.com/mkerrisk/man-pages/commit/7b6a3299776b5c1c4f169a591434a855d50c68b4#diff-efd6af3a70f0f07c578e85b51e83b3c3

2 files changed, 1 insertions, 4 deletions

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 8f19e0efc3..cd6244f7ea 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -190,7 +190,7 @@ CFLAGS-mq_receive.c += -fexceptions
 endif
 
 ifeq ($(subdir),nscd)
-sysdep-CFLAGS += -DHAVE_EPOLL -DHAVE_SENDFILE -DHAVE_INOTIFY -DHAVE_NETLINK
+sysdep-CFLAGS += -DHAVE_EPOLL -DHAVE_INOTIFY -DHAVE_NETLINK
 CFLAGS-gai.c += -DNEED_NETLINK
 endif
 
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index f65a262994..2ef2916a52 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -37,9 +37,6 @@
    introduced.  If somebody cares these values can afterwards be
    corrected.  */
 
-/* The sendfile syscall was introduced in 2.2.0.  */
-#define __ASSUME_SENDFILE		1
-
 /* Some architectures use the socketcall multiplexer for some or all
    socket-related operations instead of separate syscalls.
    __ASSUME_SOCKETCALL is defined for such architectures.  */