On Sun, Aug 20, 2006 at 03:05:32AM +0400, Solar Designer wrote: > Willy, > > I propose the attached patch (extracted from 2.4.33-ow1) for inclusion > into 2.4.34-pre. > > (2.6 kernels could benefit from the same change, too, but at the moment > I am dealing with proper submission of generic changes like this that > are a part of 2.4.33-ow1.) > > The patch makes getsockopt(2) sanity-check the value pointed to by > the optlen argument early on. This is a security hardening measure > intended to prevent exploitation of certain potential vulnerabilities in > socket type specific getsockopt() code on UP systems. > > This change has been a part of -ow patches for some years.
looks valid to me, merged. Thanks Alexander ! Willy > Thanks, > > -- > Alexander Peslyak <solar at openwall.com> > GPG key ID: B35D3598 fp: 6429 0D7E F130 C13E C929 6447 73C3 A290 B35D 3598 > http://www.openwall.com - bringing security into open computing environments > diff -urpPX nopatch linux-2.4.33/net/socket.c linux/net/socket.c > --- linux-2.4.33/net/socket.c Wed Jan 19 17:10:14 2005 > +++ linux/net/socket.c Sat Aug 12 08:51:47 2006 > @@ -1307,10 +1307,18 @@ asmlinkage long sys_setsockopt(int fd, i > asmlinkage long sys_getsockopt(int fd, int level, int optname, char *optval, > int *optlen) > { > int err; > + int len; > struct socket *sock; > > if ((sock = sockfd_lookup(fd, &err))!=NULL) > { > + /* XXX: insufficient for SMP, but should be redundant anyway */ > + if (get_user(len, optlen)) > + err = -EFAULT; > + else > + if (len < 0) > + err = -EINVAL; > + else > if (level == SOL_SOCKET) > err=sock_getsockopt(sock,level,optname,optval,optlen); > else - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html