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Make /proc/kmsg and /proc/sysrq-trigger system-process-readable
This is so that the system process can capture kernel thread stacks when the watchdog detects a deadlock. Previously, /proc/kmsg was root/root and mode 0400, and /proc/sysrq-trigger was root/root and mode 0200. With this change, /proc/kmsg becomes root/system and 0440, and /proc/sysrq-trigger becomes root/system and 0220. Change-Id: Iac46bd10bd11d495024afeb5d693107ce5074791
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