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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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54ebbfb160
When opening the slave end of a PTY, it is not possible for userspace to safely ensure that /dev/pts/$num is actually a slave (in cases where the mount namespace in which devpts was mounted is controlled by an untrusted process). In addition, there are several unresolvable race conditions if userspace were to attempt to detect attacks through stat(2) and other similar methods [in addition it is not clear how userspace could detect attacks involving FUSE]. Resolve this by providing an interface for userpace to safely open the "peer" end of a PTY file descriptor by using the dentry cached by devpts. Since it is not possible to have an open master PTY without having its slave exposed in /dev/pts this interface is safe. This interface currently does not provide a way to get the master pty (since it is not clear whether such an interface is safe or even useful). Cc: Christian Brauner <christian.brauner@ubuntu.com> Cc: Valentin Rothberg <vrothberg@suse.com> Signed-off-by: Aleksa Sarai <asarai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
#ifndef __ASM_GENERIC_IOCTLS_H
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#define __ASM_GENERIC_IOCTLS_H
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#include <linux/ioctl.h>
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/*
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* These are the most common definitions for tty ioctl numbers.
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* Most of them do not use the recommended _IOC(), but there is
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* probably some source code out there hardcoding the number,
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* so we might as well use them for all new platforms.
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*
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* The architectures that use different values here typically
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* try to be compatible with some Unix variants for the same
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* architecture.
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*/
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/* 0x54 is just a magic number to make these relatively unique ('T') */
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#define TCGETS 0x5401
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#define TCSETS 0x5402
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#define TCSETSW 0x5403
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#define TCSETSF 0x5404
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#define TCGETA 0x5405
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#define TCSETA 0x5406
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#define TCSETAW 0x5407
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#define TCSETAF 0x5408
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#define TCSBRK 0x5409
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#define TCXONC 0x540A
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#define TCFLSH 0x540B
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#define TIOCEXCL 0x540C
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#define TIOCNXCL 0x540D
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#define TIOCSCTTY 0x540E
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#define TIOCGPGRP 0x540F
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#define TIOCSPGRP 0x5410
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#define TIOCOUTQ 0x5411
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#define TIOCSTI 0x5412
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#define TIOCGWINSZ 0x5413
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#define TIOCSWINSZ 0x5414
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#define TIOCMGET 0x5415
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#define TIOCMBIS 0x5416
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#define TIOCMBIC 0x5417
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#define TIOCMSET 0x5418
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#define TIOCGSOFTCAR 0x5419
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#define TIOCSSOFTCAR 0x541A
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#define FIONREAD 0x541B
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#define TIOCINQ FIONREAD
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#define TIOCLINUX 0x541C
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#define TIOCCONS 0x541D
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#define TIOCGSERIAL 0x541E
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#define TIOCSSERIAL 0x541F
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#define TIOCPKT 0x5420
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#define FIONBIO 0x5421
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#define TIOCNOTTY 0x5422
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#define TIOCSETD 0x5423
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#define TIOCGETD 0x5424
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#define TCSBRKP 0x5425 /* Needed for POSIX tcsendbreak() */
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#define TIOCSBRK 0x5427 /* BSD compatibility */
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#define TIOCCBRK 0x5428 /* BSD compatibility */
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#define TIOCGSID 0x5429 /* Return the session ID of FD */
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#define TCGETS2 _IOR('T', 0x2A, struct termios2)
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#define TCSETS2 _IOW('T', 0x2B, struct termios2)
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#define TCSETSW2 _IOW('T', 0x2C, struct termios2)
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#define TCSETSF2 _IOW('T', 0x2D, struct termios2)
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#define TIOCGRS485 0x542E
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#ifndef TIOCSRS485
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#define TIOCSRS485 0x542F
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#endif
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#define TIOCGPTN _IOR('T', 0x30, unsigned int) /* Get Pty Number (of pty-mux device) */
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#define TIOCSPTLCK _IOW('T', 0x31, int) /* Lock/unlock Pty */
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#define TIOCGDEV _IOR('T', 0x32, unsigned int) /* Get primary device node of /dev/console */
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#define TCGETX 0x5432 /* SYS5 TCGETX compatibility */
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#define TCSETX 0x5433
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#define TCSETXF 0x5434
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#define TCSETXW 0x5435
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#define TIOCSIG _IOW('T', 0x36, int) /* pty: generate signal */
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#define TIOCVHANGUP 0x5437
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#define TIOCGPKT _IOR('T', 0x38, int) /* Get packet mode state */
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#define TIOCGPTLCK _IOR('T', 0x39, int) /* Get Pty lock state */
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#define TIOCGEXCL _IOR('T', 0x40, int) /* Get exclusive mode state */
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#define TIOCGPTPEER _IOR('T', 0x41, int) /* Safely open the slave */
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#define FIONCLEX 0x5450
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#define FIOCLEX 0x5451
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#define FIOASYNC 0x5452
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#define TIOCSERCONFIG 0x5453
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#define TIOCSERGWILD 0x5454
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#define TIOCSERSWILD 0x5455
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#define TIOCGLCKTRMIOS 0x5456
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#define TIOCSLCKTRMIOS 0x5457
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#define TIOCSERGSTRUCT 0x5458 /* For debugging only */
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#define TIOCSERGETLSR 0x5459 /* Get line status register */
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#define TIOCSERGETMULTI 0x545A /* Get multiport config */
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#define TIOCSERSETMULTI 0x545B /* Set multiport config */
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#define TIOCMIWAIT 0x545C /* wait for a change on serial input line(s) */
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#define TIOCGICOUNT 0x545D /* read serial port inline interrupt counts */
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/*
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* Some arches already define FIOQSIZE due to a historical
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* conflict with a Hayes modem-specific ioctl value.
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*/
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#ifndef FIOQSIZE
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# define FIOQSIZE 0x5460
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#endif
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/* Used for packet mode */
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#define TIOCPKT_DATA 0
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#define TIOCPKT_FLUSHREAD 1
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#define TIOCPKT_FLUSHWRITE 2
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#define TIOCPKT_STOP 4
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#define TIOCPKT_START 8
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#define TIOCPKT_NOSTOP 16
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#define TIOCPKT_DOSTOP 32
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#define TIOCPKT_IOCTL 64
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#define TIOCSER_TEMT 0x01 /* Transmitter physically empty */
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#endif /* __ASM_GENERIC_IOCTLS_H */
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