Linus Torvalds 287b569a5b tty: add the option to have a tty reject a new ldisc ... [ Upstream commit 6bd23e0c2b ] ... and use it to limit the virtual terminals to just N_TTY. They are kind of special, and in particular, the "con_write()" routine violates the "writes cannot sleep" rule that some ldiscs rely on. This avoids the BUG: sleeping function called from invalid context at kernel/printk/printk.c:2659 when N_GSM has been attached to a virtual console, and gsmld_write() calls con_write() while holding a spinlock, and con_write() then tries to get the console lock. Tested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Cc: Jiri Slaby <jirislaby@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Daniel Starke <daniel.starke@siemens.com> Reported-by: syzbot <syzbot+dbac96d8e73b61aa559c@syzkaller.appspotmail.com> Closes: https://syzkaller.appspot.com/bug?extid=dbac96d8e73b61aa559c Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20240423163339.59780-1-torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-06-27 13:49:05 +02:00
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acpi	ACPI: x86: Move acpi_quirk_skip_serdev_enumeration() out of CONFIG_X86_ANDROID_TABLETS	2024-04-13 13:07:31 +02:00
asm-generic	sched: Add missing memory barrier in switch_mm_cid	2024-04-27 17:11:41 +02:00
clocksource
crypto
drm	drm/edid: Parse topology block for all DispID structure v1.x	2024-06-12 11:12:05 +02:00
dt-bindings
keys
kunit
kvm
linux	tty: add the option to have a tty reject a new ldisc	2024-06-27 13:49:05 +02:00
math-emu
media	media: cec: core: avoid recursive cec_claim_log_addrs	2024-06-12 11:12:43 +02:00
memory
misc
net	net/sched: fix false lockdep warning on qdisc root lock	2024-06-27 13:49:02 +02:00
pcmcia
ras
rdma
rv
scsi	scsi: mpi3mr: Fix ATA NCQ priority support	2024-06-21 14:38:25 +02:00
soc	soc: qcom: rpmh-rsc: Enhance check for VRM in-flight request	2024-06-16 13:47:33 +02:00
sound	ASoC: tas2781: Fix wrong loading calibrated data sequence	2024-06-12 11:12:47 +02:00
target
trace	cachefiles: fix slab-use-after-free in cachefiles_ondemand_daemon_read()	2024-06-21 14:38:27 +02:00
uapi	drm/nouveau: use tile_mode and pte_kind for VM_BIND bo allocations	2024-06-12 11:12:45 +02:00
ufs
vdso
video
xen