d12d651f86
Make it work, but change the interface to be safe for non-root users. In particular, right now interface only works for the tables which can be minimally parsed by kernel to determine the table size. Then, userspace can query the table size, after that it provides a buffer of needed size and kernel copies out just table to userspace. Main advantage is that user no longer need to be able to read /dev/mem, the disadvantage is the need to have minimal parsers aware of the table types. Right now the parsers are implemented for ESRT and PROP tables. Future extension of the present interface might be a return of only the table physical address, in case kernel does not have suitable parser yet. Then, a privileged user could read the table from /dev/mem. This extension, which logically equivalent to the old (non-worked) EFIIOC_GET_TABLE variant, is not implemented until needed. Submitted by: Pavel Balaev <pavel.balaev@3mdeb.com> MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D30104 |
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