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[SA-14:25] Fix kernel stack disclosure in setlogin(2) / getlogin(2).

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[SA-14:26] Fix remote command execution in ftp(1).

Approved by:	so (des)
This commit is contained in:
Dag-Erling Smørgrav 2014-11-04 23:29:29 +00:00
parent f669586400
commit bccb6d5aa1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=274106
2 changed files with 38 additions and 29 deletions
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36
contrib/tnftp/src/fetch.c
View file

@ -547,7 +547,7 @@ fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth)
url_decode(decodedpath);
if (outfile)
savefile = ftp_strdup(outfile);
savefile = outfile;
else {
cp = strrchr(decodedpath, '/'); /* find savefile */
if (cp != NULL)
@ -571,8 +571,7 @@ fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth)
rangestart = rangeend = entitylen = -1;
mtime = -1;
if (restartautofetch) {
if (strcmp(savefile, "-") != 0 && *savefile != '|' &&
stat(savefile, &sb) == 0)
if (stat(savefile, &sb) == 0)
restart_point = sb.st_size;
}
if (urltype == FILE_URL_T) { /* file:// URLs */
@ -1098,17 +1097,25 @@ fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth)
} /* end of ftp:// or http:// specific setup */
/* Open the output file. */
if (strcmp(savefile, "-") == 0) {
fout = stdout;
} else if (*savefile == '|') {
oldintp = xsignal(SIGPIPE, SIG_IGN);
fout = popen(savefile + 1, "w");
if (fout == NULL) {
warn("Can't execute `%s'", savefile + 1);
goto cleanup_fetch_url;
/*
* Only trust filenames with special meaning if they came from
* the command line
*/
if (outfile == savefile) {
if (strcmp(savefile, "-") == 0) {
fout = stdout;
} else if (*savefile == '|') {
oldintp = xsignal(SIGPIPE, SIG_IGN);
fout = popen(savefile + 1, "w");
if (fout == NULL) {
warn("Can't execute `%s'", savefile + 1);
goto cleanup_fetch_url;
}
closefunc = pclose;
}
closefunc = pclose;
} else {
}
if (fout == NULL) {
if ((rangeend != -1 && rangeend <= restart_point) ||
(rangestart == -1 && filesize != -1 && filesize <= restart_point)) {
/* already done */
@ -1318,7 +1325,8 @@ fetch_url(const char *url, const char *proxyenv, char *proxyauth, char *wwwauth)
(*closefunc)(fout);
if (res0)
freeaddrinfo(res0);
FREEPTR(savefile);
if (savefile != outfile)
FREEPTR(savefile);
FREEPTR(uuser);
if (pass != NULL)
memset(pass, 0, strlen(pass));

31
sys/kern/kern_prot.c
View file

@ -2066,21 +2066,20 @@ struct getlogin_args {
int
sys_getlogin(struct thread *td, struct getlogin_args *uap)
{
int error;
char login[MAXLOGNAME];
struct proc *p = td->td_proc;
size_t len;
if (uap->namelen > MAXLOGNAME)
uap->namelen = MAXLOGNAME;
PROC_LOCK(p);
SESS_LOCK(p->p_session);
bcopy(p->p_session->s_login, login, uap->namelen);
len = strlcpy(login, p->p_session->s_login, uap->namelen) + 1;
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
if (strlen(login) + 1 > uap->namelen)
if (len > uap->namelen)
return (ERANGE);
error = copyout(login, uap->namebuf, uap->namelen);
return (error);
return (copyout(login, uap->namebuf, len));
}
/*
@ -2099,21 +2098,23 @@ sys_setlogin(struct thread *td, struct setlogin_args *uap)
int error;
char logintmp[MAXLOGNAME];
CTASSERT(sizeof(p->p_session->s_login) >= sizeof(logintmp));
error = priv_check(td, PRIV_PROC_SETLOGIN);
if (error)
return (error);
error = copyinstr(uap->namebuf, logintmp, sizeof(logintmp), NULL);
if (error == ENAMETOOLONG)
error = EINVAL;
else if (!error) {
PROC_LOCK(p);
SESS_LOCK(p->p_session);
(void) memcpy(p->p_session->s_login, logintmp,
sizeof(logintmp));
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
if (error != 0) {
if (error == ENAMETOOLONG)
error = EINVAL;
return (error);
}
return (error);
PROC_LOCK(p);
SESS_LOCK(p->p_session);
strcpy(p->p_session->s_login, logintmp);
SESS_UNLOCK(p->p_session);
PROC_UNLOCK(p);
return (0);
}
void