vcs: prevent write access to vcsu devices
Commitd21b0be246
("vt: introduce unicode mode for /dev/vcs") guarded against using devices containing attributes as this is not yet implemented. It however failed to guard against writes to any devices as this is also unimplemented. Reported-by: Or Cohen <orcohen@paloaltonetworks.com> Signed-off-by: Nicolas Pitre <npitre@baylibre.com> Cc: <stable@vger.kernel.org> # v4.19+ Cc: Jiri Slaby <jslaby@suse.com> Fixes:d21b0be246
("vt: introduce unicode mode for /dev/vcs") Link: https://lore.kernel.org/r/nycvar.YSQ.7.76.1911051030580.30289@knanqh.ubzr Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -456,6 +456,9 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
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size_t ret;
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size_t ret;
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char *con_buf;
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char *con_buf;
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if (use_unicode(inode))
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return -EOPNOTSUPP;
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con_buf = (char *) __get_free_page(GFP_KERNEL);
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con_buf = (char *) __get_free_page(GFP_KERNEL);
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if (!con_buf)
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if (!con_buf)
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return -ENOMEM;
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return -ENOMEM;
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