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- djm@cvs.openbsd.org 2007/05/17 07:55:29 

[sftp-server.c]
     bz#1286 stop reading and processing commands when input or output buffer
     is nearly full, otherwise sftp-server would happily try to grow the
     input/output buffers past the maximum supported by the buffer API and
     promptly fatal()
     based on patch from Thue Janus Kristensen; feedback & ok dtucker@
This commit is contained in:
Darren Tucker 2007-05-20 15:09:04 +10:00
parent 36b78000a7
commit e9405983dc
2 changed files with 27 additions and 7 deletions
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9
ChangeLog
View File

@ -15,6 +15,13 @@
- djm@cvs.openbsd.org 2007/05/17 07:50:31 - djm@cvs.openbsd.org 2007/05/17 07:50:31
[log.c] [log.c]
save and restore errno when logging; ok deraadt@ save and restore errno when logging; ok deraadt@
- djm@cvs.openbsd.org 2007/05/17 07:55:29
[sftp-server.c]
bz#1286 stop reading and processing commands when input or output buffer
is nearly full, otherwise sftp-server would happily try to grow the
input/output buffers past the maximum supported by the buffer API and
promptly fatal()
based on patch from Thue Janus Kristensen; feedback & ok dtucker@
20070509 20070509
- (tim) [configure.ac] Bug #1287: Add missing test for ucred.h. - (tim) [configure.ac] Bug #1287: Add missing test for ucred.h.
@ -2915,4 +2922,4 @@
OpenServer 6 and add osr5bigcrypt support so when someone migrates OpenServer 6 and add osr5bigcrypt support so when someone migrates
passwords between UnixWare and OpenServer they will still work. OK dtucker@ passwords between UnixWare and OpenServer they will still work. OK dtucker@
$Id: ChangeLog,v 1.4664 2007/05/20 05:08:15 dtucker Exp $ $Id: ChangeLog,v 1.4665 2007/05/20 05:09:04 dtucker Exp $

25
sftp-server.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sftp-server.c,v 1.72 2007/04/18 01:12:43 stevesk Exp $ */ /* $OpenBSD: sftp-server.c,v 1.73 2007/05/17 07:55:29 djm Exp $ */
/* /*
* Copyright (c) 2000-2004 Markus Friedl. All rights reserved. * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
* *
@ -1214,7 +1214,7 @@ main(int argc, char **argv)
int in, out, max, ch, skipargs = 0, log_stderr = 0; int in, out, max, ch, skipargs = 0, log_stderr = 0;
ssize_t len, olen, set_size; ssize_t len, olen, set_size;
SyslogFacility log_facility = SYSLOG_FACILITY_AUTH; SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
char *cp; char *cp, buf[4*4096];
extern char *optarg; extern char *optarg;
extern char *__progname; extern char *__progname;
@ -1298,7 +1298,15 @@ main(int argc, char **argv)
memset(rset, 0, set_size); memset(rset, 0, set_size);
memset(wset, 0, set_size); memset(wset, 0, set_size);
FD_SET(in, rset); /*
* Ensure that we can read a full buffer and handle
* the worst-case length packet it can generate,
* otherwise apply backpressure by stopping reads.
*/
if (buffer_check_alloc(&iqueue, sizeof(buf)) &&
buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
FD_SET(in, rset);
olen = buffer_len(&oqueue); olen = buffer_len(&oqueue);
if (olen > 0) if (olen > 0)
FD_SET(out, wset); FD_SET(out, wset);
@ -1312,7 +1320,6 @@ main(int argc, char **argv)
/* copy stdin to iqueue */ /* copy stdin to iqueue */
if (FD_ISSET(in, rset)) { if (FD_ISSET(in, rset)) {
char buf[4*4096];
len = read(in, buf, sizeof buf); len = read(in, buf, sizeof buf);
if (len == 0) { if (len == 0) {
debug("read eof"); debug("read eof");
@ -1334,7 +1341,13 @@ main(int argc, char **argv)
buffer_consume(&oqueue, len); buffer_consume(&oqueue, len);
} }
} }
/* process requests from client */
process(); /*
* Process requests from client if we can fit the results
* into the output buffer, otherwise stop processing input
* and let the output queue drain.
*/
if (buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
process();
} }
} }