da21d85025
This patch adds support for Unix98 pseudo terminals, that is, posix_openpt(3), grantpt(3), unlockpt(3), /dev/ptmx, and /dev/pts/. The latter is implemented with a new pseudo file system, PTYFS. In effect, this patch adds secure support for unprivileged pseudo terminal allocation, allowing programs such as tmux(1) to be used by non-root users as well. Test77 has been extended with new tests, and no longer needs to run as root. The new functionality is optional. To revert to the old behavior, remove the "ptyfs" entry from /etc/fstab. Technical nodes: o The reason for not implementing the NetBSD /dev/ptm approach is that implementing the corresponding ioctl (TIOCPTMGET) would require adding a number of extremely hairy exceptions to VFS, including the PTY driver having to create new file descriptors for its own device nodes. o PTYFS is required for Unix98 PTYs in order to avoid that the PTY driver has to be aware of old-style PTY naming schemes and even has to call chmod(2) on a disk-backed file system. PTY cannot be its own PTYFS since a character driver may currently not also be a file system. However, PTYFS may be subsumed into a DEVFS in the future. o The Unix98 PTY behavior differs somewhat from NetBSD's, in that slave nodes are created on ptyfs only upon the first call to grantpt(3). This approach obviates the need to revoke access as part of the grantpt(3) call. o Shutting down PTY may leave slave nodes on PTYFS, but once PTY is restarted, these leftover slave nodes will be removed before they create a security risk. Unmounting PTYFS will make existing PTY slaves permanently unavailable, and absence of PTYFS will block allocation of new Unix98 PTYs until PTYFS is (re)mounted. Change-Id: I822b43ba32707c8815fd0f7d5bb7a438f51421c1
256 lines
5.5 KiB
Bash
256 lines
5.5 KiB
Bash
#!/bin/sh
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#
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# DESCRIBE 2.2 - Describe the given devices. Author: Kees J. Bot
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#
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# BUGS
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# - Arguments may not contain shell metacharacters.
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case $# in
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0) flag=; set -$- /dev ;;
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*) flag=d ;;
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esac
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ls -l$flag $* | \
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sed -e '/^total/d' \
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-e '/^l/d' \
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-e '/^[^bc]/s/.* /BAD BAD /' \
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-e '/^[bc]/s/.* \([0-9][0-9]*\), *\([0-9][0-9]*\).* /\1 \2 /' \
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| {
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ex=0 # exit code
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while read major minor path
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do
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case $path in
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/*) name=`expr $path : '.*/\\(.*\\)$'`
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;;
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*) name=$path
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esac
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dev= des=
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case $major in # One of the controllers? What is its controller nr?
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3) ctrlr=0 ;;
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8) ctrlr=1 ;;
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10) ctrlr=2 ;;
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12) ctrlr=3 ;;
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esac
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case $major,$minor in
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1,0) des="RAM disk" dev=ram
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;;
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1,1) des="memory" dev=mem
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;;
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1,2) des="kernel memory" dev=kmem
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;;
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1,3) des="null device, data sink" dev=null
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;;
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1,4) des="boot device loaded from boot image" dev=boot
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;;
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1,5) des="null byte stream generator" dev=zero
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;;
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1,6) des="boot image RAM disk" dev=imgrd
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;;
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1,[789]|1,1[012])
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ramdisk=`expr $minor - 7`
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des="RAM disk $ramdisk" dev=ram$ramdisk
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;;
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2,*) drive=`expr $minor % 4`
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case `expr $minor - $drive` in
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0) des='auto density' dev="fd$drive"
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;;
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4) des='360k, 5.25"' dev="pc$drive"
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;;
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8) des='1.2M, 5.25"' dev="at$drive"
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;;
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12) des='360k in 720k, 5.25"' dev="qd$drive"
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;;
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16) des='720k, 3.5"' dev="ps$drive"
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;;
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20) des='360k in 1.2M, 5.25"' dev="pat$drive"
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;;
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24) des='720k in 1.2M, 5.25"' dev="qh$drive"
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;;
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28) des='1.44M, 3.5"' dev="PS$drive"
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;;
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112) des='auto partition 0' dev="fd${drive}p0"
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;;
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116) des='auto partition 1' dev="fd${drive}p1"
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;;
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120) des='auto partition 2' dev="fd${drive}p2"
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;;
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124) des='auto partition 3' dev="fd${drive}p3"
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;;
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*) dev=BAD
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esac
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des="floppy drive $drive ($des)"
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;;
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[38],[05]|[38],[123][05]|1[02],[05]|1[02],[123][05])
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drive=`expr $minor / 5`
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des="controller $ctrlr disk $drive" dev=c${ctrlr}d${drive}
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;;
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[38],?|[38],[123]?|1[02],?|1[02],[123]?)
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drive=`expr $minor / 5`
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par=`expr $minor % 5 - 1`
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des="controller $ctrlr disk $drive partition $par"
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dev=c${ctrlr}d${drive}p${par}
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;;
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[38],12[89]|[38],1[3-9]?|[38],2??|1[02],12[89]|1[02],1[3-9]?|1[02],2??)
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drive=`expr \\( $minor - 128 \\) / 16`
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par=`expr \\( \\( $minor - 128 \\) / 4 \\) % 4`
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sub=`expr \\( $minor - 128 \\) % 4`
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des="hard disk $drive, partition $par, subpartition $sub"
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des="controller $ctrlr disk $drive partition $par slice $sub"
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#par=`expr $drive '*' 5 + $par`
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dev=c${ctrlr}d${drive}p${par}s${sub}
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;;
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[38],6[4-9]|[38],7?|1[02],6[4-9]|1[02],7?)
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tape=`expr \\( $minor - 64 \\) / 2`
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case $minor in
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*[02468])
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des="controller $ctrlr tape $tape (non-rewinding)"
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dev=c${ctrlr}t${tape}n
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;;
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*[13579])
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des="controller $ctrlr tape $tape (rewinding)"
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dev=c${ctrlr}t${tape}
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esac
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;;
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4,0) des="console device" dev=console
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;;
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4,[1-7])des="virtual console $minor" dev=ttyc$minor
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;;
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4,15) des="diagnostics device" dev=log
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;;
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4,1[6-9])
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line=`expr $minor - 16`
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des="serial line $line" dev=tty0$line
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;;
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4,125) des="video output" dev=video
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;;
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5,0) des="anonymous tty" dev=tty
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;;
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6,0) des="line printer, parallel port" dev=lp
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;;
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7,*)
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d=`expr $minor % 8`
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n=`expr $minor / 8`
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case $d in
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0) des="IP stat" dev=ipstat
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;;
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1) case $name in
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psip*)
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des="Pseudo IP #$n" dev=psip
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;;
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*) des="raw ethernet #$n" dev=eth
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esac
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;;
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2) des="raw IP #$n" dev=ip
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;;
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3) des="TCP/IP #$n" dev=tcp
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;;
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4) des="UDP #$n" dev=udp
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esac
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case $d in
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[0123])
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if [ "$name" = "$dev" ]
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then
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des="$des (default)"
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else
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dev=$dev$n
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fi
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esac
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;;
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9,0)
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des="unix98 pseudoterminal master" dev=ptmx
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;;
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9,12[89]|9,1[3-8]?|9,19[01])
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p=`expr \\( $minor - 128 \\) / 16 | tr '0123' 'pqrs'`
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n=`expr $minor % 16`
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test $n -ge 10 && n=`expr $n - 10 | tr '012345' 'abcdef'`
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des="pseudo tty `expr $minor - 128`" dev=tty$p$n
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;;
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9,???)
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p=`expr \\( $minor - 192 \\) / 16 | tr '0123' 'pqrs'`
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n=`expr $minor % 16`
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test $n -ge 10 && n=`expr $n - 10 | tr '012345' 'abcdef'`
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des="controller of tty$p$n" dev=pty$p$n
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;;
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11,0)
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des="block filter" dev=filter
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;;
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13,0)
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des="audio" dev=audio
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;;
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14,0)
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des="faulty block device driver" dev=fbd
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;;
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15,0)
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des="kernel log" dev=klog
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;;
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16,0)
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des="pseudo random number generator" dev=urandom
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;;
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17,0)
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des="hello" dev=hello
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;;
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18,0)
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des="UNIX domain socket" dev=uds
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;;
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5[6-9],0|6[0-3],0)
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drive=`expr $major - 56`
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des="vnode disk $drive" dev=vnd$drive
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;;
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5[6-9],[1-4]|6[0-3],[1-4])
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drive=`expr $major - 56`
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par=`expr $minor - 1`
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des="vnode disk $drive partition $par" dev=vnd${drive}p${par}
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;;
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5[6-9],12[89]|5[6-9],13[0-9]|5[6-9],14[0-3]|6[0-3],12[89]|5[6-9],13[0-9]|5[6-9],14[0-3])
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drive=`expr $major - 56`
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par=`expr \\( \\( $minor - 128 \\) / 4 \\) % 4`
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sub=`expr \\( $minor - 128 \\) % 4`
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des="vnode disk $drive partition $par slice $sub"
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dev=vnd${drive}p${par}s${sub}
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;;
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64,0)
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des="keyboard input multiplexer"
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dev=kbdmux
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;;
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64,[1-4])
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n=`expr $minor - 1`
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des="keyboard input $n"
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dev=kbd$n
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;;
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64,64)
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des="mouse input multiplexer"
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dev=mousemux
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;;
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64,6[5-8])
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n=`expr $minor - 65`
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des="mouse input $n"
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dev=mouse$n
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;;
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BAD,BAD)
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des= dev=
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;;
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*) dev=BAD
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esac
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case $name:$dev in
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*:)
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echo "$path: not a device" >&2
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ex=1
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;;
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*:*BAD*)
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echo "$path: cannot describe: major=$major, minor=$minor" >&2
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ex=1
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;;
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$dev:*)
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echo "$path: $des"
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;;
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*:*) echo "$path: nonstandard name for $dev: $des"
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esac
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done
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exit $ex
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}
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