In the Linux kernel, the following vulnerability has been resolved: EFI/CPER: don't dump the...

In the Linux kernel, the following vulnerability has been resolved:

EFI/CPER: don't dump the entire memory region

The current logic at cper_print_fw_err() doesn't check if the error record length is big enough to handle offset. On a bad firmware, if the ofset is above the actual record, length -= offset will underflow, making it dump the entire memory.

The end result can be:

• the logic taking a lot of time dumping large regions of memory;
• data disclosure due to the memory dumps;
• an OOPS, if it tries to dump an unmapped memory region.

Fix it by checking if the section length is too small before doing a hex dump.

[ rjw: Subject tweaks ]