282381aa53
The firmware header loaded into an rsu(4) device has to be customized to reflect device settings. The driver was overwriting the header from the shared firmware image before sending it to the device. If two devices attached at the same time with different settings, one device could potentially get a corrupted header. The recent changes in a095390344fb1795c1b118a2f84da8f6a7f254ab exposed this bug in the form of a panic as the firmware blobs are now marked read-only in object files and mapped read-only by the kernel. To avoid the bug, change the driver to allocate a copy of the firmware header on the stack that is initialized before writing it to the device. PR: 252163 Reported by: vidwer+fbsdbugs@gmail.com Tested by: vidwer+fbsdbugs@gmail.com Reviewed by: hselasky, bz, emaste Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D27850
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