In the Linux kernel, the following vulnerability has been resolved: tty: add the option to have a tty reject a new ldisc ... and use it to limit the virtual terminals to just NTTY. They are kind of special, and in particular, the "conwrite()" 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 NGSM has been attached to a virtual console, and gsmldwrite() calls conwrite() while holding a spinlock, and conwrite() then tries to get the console lock.
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