Bug#315235: marked as done (kernel: sending with MSG_MORE causes data-loss.)
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and subject line Invalid report.
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From: Sebastian Andersson <sa@hogia.net>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: kernel: sending with MSG_MORE causes data-loss.
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Date: Tue, 21 Jun 2005 12:20:00 +0200
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Package: kernel
Severity: minor
When sending data to an IPv4 tcp socket with the MSG_MORE flag
and there are data to be read from the socket, the sent data
is lost when the socket is closed.
How to test:
Compile this program and run it with a free tcp port as argument:
----------------------8<-----------------------
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <netdb.h>
#include <string.h>
int
main(int argc, char **argv)
{
struct sockaddr_in socket_addr;
int fd = socket(PF_INET, SOCK_STREAM, 0);
socklen_t len = sizeof(socket_addr);
int on = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on));
memset(&socket_addr, 0, sizeof(socket_addr));
socket_addr.sin_family = AF_INET;
socket_addr.sin_port = htons(atoi(argv[1]));
socket_addr.sin_addr.s_addr = INADDR_ANY;
bind(fd, (struct sockaddr *) &socket_addr, sizeof(socket_addr));
listen(fd, 1);
fd = accept(fd, (struct sockaddr *) &socket_addr, &len);
recv(fd, &on, 1, 0);
send(fd, "HI ", 3, 0);
send(fd, "THERE\r\n", 8, MSG_MORE);
close(fd);
sleep(5);
return 0;
}
----------------------8<-----------------------
Connect to the port with telnet or netcat and send at least 2 bytes to it.
The client will be able to read "HI ", but the "THERE\r\n" part is lost.
I've also tested this on someone's localy compiled 2.4.26-k7-smp kernel
with the same result.
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.4.25-1-686-smp
Locale: LANG=sv_SE, LC_CTYPE=sv_SE (charmap=ISO-8859-1)
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Date: Mon, 17 Oct 2005 08:28:56 +0200
From: Sebastian Andersson <sa@hogia.net>
To: 315235-done@bugs.debian.org
Subject: Invalid report.
Message-ID: <20051017062855.GA19903@hogia.net>
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version=2.60-bugs.debian.org_2005_01_02
The test program, and the error report is incorrect,
see http://bugzilla.kernel.org/show_bug.cgi?id=5437
for more info. (Short summary; a tcp stream that is closed when there
is more data to be read should not send out unsent data).
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