Messages in this thread |  | | Date | Thu, 26 Apr 2001 14:51:20 -0700 (PDT) | From | William Ie <> | Subject | [CHECKER] security rules? |
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Hi, my name is William Ie and I am currently working with the mc group. We are currently looking into how capability checks are used in the 2.4.3 kernel. Along the way, we found a few potential bugs that we are not too sure about. Please bear in mind our checker right now is still very very crude. 1. linux/2.4.3/drivers/block/cciss.c:381:cciss_ioctl: put_user(hba[ctlr]->hd[MINOR(inode->i_rdev)].start_sect, &geo->start); return 0; case BLKGETSIZE: if (!arg) return -EINVAL; put_user(hba[ctlr]->hd[MINOR(inode->i_rdev)].nr_sects, (long*)arg); return 0; case BLKRRPART: return revalidate_logvol(inode->i_rdev, 1); Error ---> case BLKFLSBUF: our analysis indicates that servicing of the BLKRRPART requires the CAP_SYS_ADMIN capability check, which is not being done here. Is this a bug? 2. linux/2.4.3/drivers/block/cpqarray.c:1182:ida_ioctl:
case IDAGETDRVINFO: return copy_to_user(&io->c.drv,&hba[ctlr]->drv[dsk],sizeof(drv_info_t)); case BLKGETSIZE: if (!arg) return -EINVAL;
put_user(ida[(ctlr<<CTLR_SHIFT)+MINOR(inode->i_rdev)].nr_sects, (long*)arg); return 0; case BLKRRPART: return revalidate_logvol(inode->i_rdev, 1); Error ---> case IDAPASSTHRU: if (!suser()) return -EPERM; error = copy_from_user(&my_io, io, sizeof(my_io)); if (error) return error; error = ida_ctlr_ioctl(ctlr, dsk, &my_io);
Same as above. 3. linux/2.4.3/net/rose/af_rose.c:1290:rose_ioctl: case SIOCRSSCAUSE: { struct rose_cause_struct rose_cause; if (copy_from_user(&rose_cause, (void *)arg, sizeof(struct rose_cause_struct))) return -EFAULT; sk->protinfo.rose->cause = rose_cause.cause; sk->protinfo.rose->diagnostic = rose_cause.diagnostic; return 0; } The code appears to us to be configuring the device without CAP_NET_ADMIN capability although we are not too sure that this is actually ok. 4.linux/2.4.3/drivers/net/ppp_async.c:345:ppp_async_ioctl case PPPIOCGFLAGS: val = ap->flags | ap->rbits; if (put_user(val, (int *) arg)) break; err = 0; break; case PPPIOCSFLAGS: if (get_user(val, (int *) arg)) break; ap->flags = val & ~SC_RCV_BITS; spin_lock_bh(&ap->recv_lock); ap->rbits = val & SC_RCV_BITS; spin_unlock_bh(&ap->recv_lock); err = 0; break; seems to be getting and setting some flags without CAP_NET_ADMIN like in ppp_synctty.c 5. linux/2.4.3/drivers/isdn/isdn_ppp.c:478:isdn_ppp_ioctl case PPPIOCGFLAGS: /* get configuration flags */ if ((r = set_arg((void *) arg, &is->pppcfg,sizeof(is->pppcfg) ))) return r; break; Error ---> case PPPIOCSFLAGS: /* set configuration flags */ if ((r = get_arg((void *) arg, &val, sizeof(val) ))) { return r; } if (val & SC_ENABLE_IP && !(is->pppcfg & SC_ENABLE_IP) && (is->state & IPPP_CONNECT)) { Same as above. 6.linux/2.4.3/drivers/net/ppp_generic.c:550:ppp_ioctl
case PPPIOCGFLAGS: val = ppp->flags | ppp->xstate | ppp->rstate; if (put_user(val, (int *) arg)) break; err = 0; break;
Error ---> Same as above.
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