NetBSD Problem Report #50454
From www@NetBSD.org Sat Nov 21 03:52:42 2015
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for <gnats-bugs@gnats.NetBSD.org>; Sat, 21 Nov 2015 03:52:42 +0000 (UTC)
Message-Id: <20151121035240.BE424A66E4@mollari.NetBSD.org>
Date: Sat, 21 Nov 2015 03:52:40 +0000 (UTC)
From: fstd.lkml@gmail.com
Reply-To: fstd.lkml@gmail.com
To: gnats-bugs@NetBSD.org
Subject: fix wall(1) -g
X-Send-Pr-Version: www-1.0
>Number: 50454
>Category: bin
>Synopsis: fix wall(1) -g
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: bin-bug-people
>State: closed
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Nov 21 03:55:00 +0000 2015
>Closed-Date: Thu Nov 26 20:28:47 +0000 2015
>Last-Modified: Thu Nov 26 20:28:47 +0000 2015
>Originator: Timo Buhrmester
>Release: 7.0
>Organization:
>Environment:
NetBSD dedi 7.0_STABLE NetBSD 7.0_STABLE (DEDIKERN) #0: Wed Nov 18 03:23:46 CET 2015 build@dedi:/stor/netbsd/obj/sys/arch/amd64/compile/DEDIKERN amd64
>Description:
Due to a missing sizeof, wall(1) allocates too little memory to hold the group member list which leads to undefined behavior when attempting to send messages to all users in a group using wall -g.
Below is a patch to correct this.
While there, remove two unnecessary typecasts.
>How-To-Repeat:
echo foo | wall -g nonempty_group
>Fix:
--- usr.bin/wall/wall.c.orig 2015-11-21 04:44:01.000000000 +0100
+++ usr.bin/wall/wall.c 2015-11-21 04:44:04.000000000 +0100
@@ -169,12 +169,12 @@
for (i = 0; grp->gr_mem[i]; i++)
continue;
- g = (struct wallgroup *)malloc(sizeof *g);
+ g = malloc(sizeof *g);
if (g == NULL)
err(1, "malloc");
g->gid = grp->gr_gid;
g->name = name;
- g->mem = (char **)malloc(i + 1);
+ g->mem = malloc((i + 1) * sizeof *g->mem);
if (g->mem == NULL)
err(1, "malloc");
for (i = 0; grp->gr_mem[i] != NULL; i++) {
>Release-Note:
>Audit-Trail:
From: "Christos Zoulas" <christos@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc:
Subject: PR/50454 CVS commit: src/usr.bin/wall
Date: Sat, 21 Nov 2015 09:59:51 -0500
Module Name: src
Committed By: christos
Date: Sat Nov 21 14:59:51 UTC 2015
Modified Files:
src/usr.bin/wall: Makefile wall.c
Log Message:
PR/50454: Timo Buhrmester: Fix wrong allocation for wall(1) -g
Modernize.
To generate a diff of this commit:
cvs rdiff -u -r1.10 -r1.11 src/usr.bin/wall/Makefile
cvs rdiff -u -r1.29 -r1.30 src/usr.bin/wall/wall.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
State-Changed-From-To: open->closed
State-Changed-By: mrg@NetBSD.org
State-Changed-When: Thu, 26 Nov 2015 20:28:47 +0000
State-Changed-Why:
christos fixed it.
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.39 2013/11/01 18:47:49 spz Exp $
$NetBSD: gnats_config.sh,v 1.8 2006/05/07 09:23:38 tsutsui Exp $
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