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Fix a security problem where the ktrace.out file could have been written

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over a file owned by someone else.

Pointed out by:	wosch
Reviewed by:	sef, imp, proff@suburbia.net, bde
This commit is contained in:
Joerg Wunsch 1997-03-15 10:39:12 +00:00
parent f9ce14711a
commit 9bedbe6c7d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=23894
2 changed files with 16 additions and 5 deletions
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2
usr.bin/ktrace/ktrace.1
View File

@ -75,7 +75,7 @@ to decode it.
The options are as follows:
.Bl -tag -width indent
.It Fl a
Append to the trace file instead of truncating it.
Append to the trace file instead of recreating it.
.It Fl C
Disable tracing on all user owned processes, and, if executed by root, all
processes in the system.

19
usr.bin/ktrace/ktrace.c
View File

@ -42,7 +42,7 @@ static char copyright[] =
static char sccsid[] = "@(#)ktrace.c 8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
"$Id$";
"$Id: ktrace.c,v 1.8 1997/02/22 19:55:27 peter Exp $";
#endif /* not lint */
#include <sys/param.h>
@ -72,6 +72,7 @@ main(argc, argv)
int append, ch, fd, inherit, ops, pid, pidset, trpoints;
char *tracefile;
mode_t omask;
struct stat sb;
clear = NOTSET;
append = ops = pidset = inherit = 0;
@ -140,9 +141,19 @@ main(argc, argv)
}
omask = umask(S_IRWXG|S_IRWXO);
if ((fd = open(tracefile, O_CREAT | O_WRONLY | (append ? 0 : O_TRUNC),
DEFFILEMODE)) < 0)
err(1, tracefile);
if (append) {
if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
err(1, tracefile);
if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
errx(1, "Refuse to append to %s not owned by you.",
tracefile);
} else {
if (unlink(tracefile) == -1 && errno != ENOENT)
err(1, "unlink %s", tracefile);
if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
DEFFILEMODE)) < 0)
err(1, tracefile);
}
(void)umask(omask);
(void)close(fd);