[lvm-devel] LVM2 ./WHATS_NEW daemons/clvmd/clvmd.c
zkabelac at sourceware.org
zkabelac at sourceware.org
Tue Feb 28 11:06:57 UTC 2012
CVSROOT: /cvs/lvm2
Module name: LVM2
Changes by: zkabelac at sourceware.org 2012-02-28 11:06:56
Modified files:
. : WHATS_NEW
daemons/clvmd : clvmd.c
Log message:
Ensure clvmd message is always \0 terminated
Drop whole buffer clearing (most messages at <100 bytes).
Just make sure we have always \0 terminated string for strlen() operations.
(before for PIPE_BUF sized messages this was not set).
Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW.diff?cvsroot=lvm2&r1=1.2322&r2=1.2323
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/daemons/clvmd/clvmd.c.diff?cvsroot=lvm2&r1=1.128&r2=1.129
--- LVM2/WHATS_NEW 2012/02/28 11:03:24 1.2322
+++ LVM2/WHATS_NEW 2012/02/28 11:06:56 1.2323
@@ -1,5 +1,6 @@
Version 2.02.94 -
====================================
+ Ensure clvmd message is always \0 terminated after read.
Better detection of missing dmeventd fifo connection (2.02.93).
Add some close() and dev_close() error path backtraces.
For polling daemon reopen stdin,stdout,stderr to /dev/null.
--- LVM2/daemons/clvmd/clvmd.c 2012/02/28 10:42:20 1.128
+++ LVM2/daemons/clvmd/clvmd.c 2012/02/28 11:06:56 1.129
@@ -1087,10 +1087,9 @@
int len;
int argslen;
int missing_len;
- char buffer[PIPE_BUF];
+ char buffer[PIPE_BUF + 1];
- memset(buffer, 0, PIPE_BUF);
- len = read(thisfd->fd, buffer, sizeof(buffer));
+ len = read(thisfd->fd, buffer, sizeof(buffer) - 1);
if (len == -1 && errno == EINTR)
return 1;
@@ -1180,6 +1179,7 @@
struct clvm_header *inheader;
int status;
+ buffer[len] = 0; /* Ensure \0 terminated */
inheader = (struct clvm_header *) buffer;
/* Fill in the client ID */
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