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2020-10-30commonlib/bsd: Add new CBFS core implementationJulius Werner
This patch adds a new CBFS implementation that is intended to replace the existing commonlib/cbfs.c. The new implementation is designed to meet a bunch of current and future goals that in aggregate make it easier to start from scratch than to adapt the exisiting implementation: 1. Be BSD-licensed so it can evetually be shared with libpayload. 2. Allow generating/verifying a metadata hash for future CBFS per-file verification (see [1][2]). 3. Be very careful about reading (not mmaping) all data only once, to be suitable for eventual TOCTOU-safe verification. 4. Make it possible to efficiently implement all current and future firmware use cases (both with and without verification). The main primitive is the cbfs_walk() function which will traverse a CBFS and call a callback for every file. cbfs_lookup() uses this to implement the most common use case of finding a file so that it can be read. A host application using this code (e.g. coreboot, libpayload, cbfstool) will need to provide a <cbfs_glue.h> header to provide the glue to access the respective CBFS storage backend implementation. This patch merely adds the code, the next patch will integrate it into coreboot. [1]: https://www.youtube.com/watch?v=Hs_EhewBgtM [2]: https://osfc.io/uploads/talk/paper/47/The_future_of_firmware_verification_in_coreboot.pdf (Note: In early discussions the metadata hash was called "master hash".) Change-Id: Ica64c1751fa37686814c0247460c399261d5814c Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/38421 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2020-09-21src/commonlib: Drop unneeded empty linesElyes HAOUAS
Change-Id: Ib3db132aa649b6895f41290df049f87a9f36dc52 Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr> Reviewed-on: https://review.coreboot.org/c/coreboot/+/44606 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
2020-09-14util/cbfstool: extend includes in commonlibIdwer Vollering
Certain non-Linux OSes require an include file in different places. Build tested on Linux, FreeBSD. Change-Id: Icd81c2a96c608589ce2ec8f4b883fd4e584776b1 Signed-off-by: Idwer Vollering <vidwer@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/38648 Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Julius Werner <jwerner@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2020-06-02commonlib: Add CBFS_TYPE_BOOTBLOCKWim Vervoorn
Add CBFS_TYPE_BOOTBLOCK to allow accessing the bootblock as a CBFS file. BUG=N/A TEST=build Change-Id: Ibb03ac3a6cd8711e0402e47335bb8e110c6ef61a Signed-off-by: Wim Vervoorn <wvervoorn@eltan.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/41824 Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-by: Frans Hendriks <fhendriks@eltan.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2020-03-30helpers: Add a helper macro for calculating power of 2Furquan Shaikh
This change adds a helper macro POWER_OF_2 that is useful for calculating the requested power of 2. Change-Id: Ie70f93b6ac175699c11cae7d8f023a52cce01e88 Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/39881 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2020-03-02lz4: Fix out-of-bounds readsAlex Rebert
Fix two out-of-bounds reads in lz4 decompression: 1) LZ4_decompress_generic could read one byte past the input buffer when decoding variable length literals due to a missing bounds check. This issue was resolved in libpayload, commonlib and cbfstool 2) ulz4fn could read up to 4 bytes past the input buffer when reading a lz4_block_header due to a missing bounds check. This issue was resolved in libpayload and commonlib. Change-Id: I5afdf7e1d43ecdb06c7b288be46813c1017569fc Signed-off-by: Alex Rebert <alexandre.rebert@gmail.com> Found-by: Mayhem Reviewed-on: https://review.coreboot.org/c/coreboot/+/39174 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2020-01-28commonlib: Add commonlib/bsdJulius Werner
This patch creates a new commonlib/bsd subdirectory with a similar purpose to the existing commonlib, with the difference that all files under this subdirectory shall be licensed under the BSD-3-Clause license (or compatible permissive license). The goal is to allow more code to be shared with libpayload in the future. Initially, I'm going to move a few files there that have already been BSD-licensed in the existing commonlib. I am also exracting most contents of the often-needed <commonlib/helpers.h> as long as they have either been written by me (and are hereby relicensed) or have an existing equivalent in BSD-licensed libpayload code. I am also relicensing <commonlib/compression.h> (written by me) and <commonlib/compiler.h> (same stuff exists in libpayload). Finally, I am extracting the cb_err error code definitions from <types.h> into a new BSD-licensed header so that future commonlib/bsd code can build upon a common set of error values. I am making the assumption here that the enum constants and the half-sentence fragments of documentation next to them by themselves do not meet the threshold of copyrightability. Change-Id: I316cea70930f131e8e93d4218542ddb5ae4b63a2 Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/38420 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Rudolph <siro@das-labor.org>