[FS#112] Kernel: SysRq spams on boot since kernel 4.4.19

[LEDE Bugs]

The following task has a new comment added:

FS#112 - Kernel: SysRq spams on boot since kernel 4.4.19
User who did this - Felix Fietkau (nbd)

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Please try the latest version from my staging tree at https://git.lede-project.org/?p=lede/nbd/staging.git;a=summary
It should prevent the modem ports from being able to issue SysRq
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=112#comment319