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BUG=b:182963902,b:177917361
TEST=Validated on qualcomm sc7280 development board
Signed-off-by: Ravi Kumar Bokka <rbokka@codeaurora.org>
Change-Id: Ieca7e9fc0e1a018fcb2e9315aebee088edac858e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59193
Reviewed-by: Shelley Chen <shchen@google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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cb_err_t was meant to be used in place of `enum cb_err` in all
situations, but the choice to use a typedef here seems to be
controversial. We should not be arbitrarily using two different
identifiers for the same thing across the codebase, so since there are
no use cases for serializing enum cb_err at the moment (which would be
the primary reason to typedef a fixed-width integer instead), remove
cb_err_t again for now.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: Iaec36210d129db26d51f0a105d3de070c03b686b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62600
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
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Change-Id: I0487698290992162fac6bb74b5082901415e917e
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51497
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
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BUG=b:182963902,b:177917361
TEST=Validated on qualcomm sc7280 development board
Signed-off-by: Ravi Kumar Bokka <rbokka@codeaurora.org>
Change-Id: I594bd9266a6379e3a85de507eaf4c56619b17a6f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59194
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Shelley Chen <shchen@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
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macOS has never defined the usual endian(3)/byteorder(9) byte-swapping
functions. This change implements these byte-swapping functions using
the OSSwap functions, which provide identical functionality. This was
tested on macOS 10.15.7.
Change-Id: I44d59869a4420030f3ce26118175304c680d57a1
Signed-off-by: Alex James <theracermaster@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60219
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
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Libpayload requires cbmem_id.h file to support extracting values from
CBMEM IMD entries of coreboot tables. Libpayload use BSD-3-Clause
license, and all of its files used to compile a static library have to
use it too.
Change-Id: I97c080e34ebdbcdf14fe3a3c9515b1dea8ede179
Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59696
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <patrick@coreboot.org>
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Add events for Chrome OS diagnostics in eventlog tool:
* ELOG_TYPE_CROS_DIAGNOSTICS(0xb6): diagnostics-related events
* ELOG_CROS_LAUNCH_DIAGNOSTICS(0x01): sub-type for diagnostics boot
These events are not added anywhere currently. They will be added in
another separate commit.
Signed-off-by: Hsuan Ting Chen <roccochen@chromium.org>
Change-Id: I1b67fdb46f64db33f581cfb5635103c9f5bbb302
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58795
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
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These issues were found and fixed by codespell, a useful tool for
finding spelling errors.
Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I5b8ecdfe75d99028fee820a2034466a8ad1c5e63
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58080
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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This CL uses a 16-bit value (instead of an 8-bit value) for the year.
This is needed because the function internally does a "year % 100", so
the year should not be truncated to 8-bit before applying the modulo.
This fixes a regression introduced in commit e929a75.
BUG=b:200538760
TEST=deployed coreboot. Manually verified that year is correct using
"elogtool list"
TEST=test_that -b $BOARD $DUT firmware_EventLog
Change-Id: I17578ff99af5b31b216ac53c22e53b1b70df5084
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57816
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
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This patch fixes a few minor CBFS parsing edge cases that could lead to
unintended behavior: the CBFS attribute parser could have run into an
infinite loop if an attribute's length was (accidentally or maliciously)
invalid. A length of 0 would have caused it to read the same attribute
over and over again without making forward progress, while a very large
length could have caused an overflow that makes it go backwards to find
the next attribute. Also, the filename was not guaranteed to be
null-terminated which could have resulted in out-of-bounds reads on a
few error messages.
Finally, clarify the validity guarantees for CBFS header fields offered
by cbfs_walk() in the comment explaining cbfs_mdata.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: Ie569786e5bec355b522f6580f53bdd8b16a4d726
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57569
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
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CBFS file with lenth of (UINT32_MAX - cbfs_file.offset + 1) causes
overflow, making cbfs_walk() being stuck in an infinite loop, and
checking the same file. This patch makes cbfs_walk() skip file headers
with incorrect data_offset or data_length.
Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Change-Id: I70020e347087cbd8134a1a60177fa9eef63fb7bd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57525
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
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Moves MAX_EVENT_SIZE to commonlib/bsd/include, and renames it
ELOG_MAX_EVENT_SIZE to give it an "scoped" name.
The moving is needed because this defined will be used from
util/cbfstool (see next CL in the chain).
BUG=b:172210863
TEST=compiles Ok
Change-Id: I86b06d257dda5b325a8478a044045b2a63fb1a84
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57394
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
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The new CBFS stack was written to try to isolate cases of single file
corruption as far as possible and still make other files avaialble (at
least as long as verification is disabled and they can still be found at
all). For most cases of header corruption, it will just continue trying
to parse the next file. However, in cases where parts of the file extend
beyond the end of the rdev, we have been relying on the range checking
of the rdev API rather than doing it explicitly.
This is fine in general, but it causes the problem that these errors
cannot be distinguished from I/O errors, and I/O errors always make the
whole cbfs_walk() fail. That means we will not return a successful
result from cbfs_mcache_build(), and leads to an odd discrepancy in how
certain kinds of corrupted CBFSes are treated with and without mcache.
This patch adds an explicit range check to make the behavior consistent.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: Ice2b6960284bd0c19be35b0607e5e32791e7a64c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57271
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
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This CL indroduces the ELOG_RW_REGION_NAME. This constant replaced the
hardcoded "RW_ELOG" value. This constant will be used also by elogtool
(see CL in the commit chain).
BUG=b:172210863
Change-Id: Ie8d31204e65fd67d52b0f8ced7b8c1ffdcf5b539
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56986
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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This commit moves some drivers/elog/ functionality to commonlib/bsd
since they will be called from util/cbfstool/.
In particular:
* elog_fill_timestamp(), elog_update_checksum(), elog_checksum_event()
were moved to commonlib/bsd/elog
* elog_fill_timestamp() receives the time parameters and updates the
event based on the "time" arguments.
The original elog_*() functions were written by Duncan Laurie
(see CB:1311) and he gave permission to re-license the code to BSD.
BUG=b:172210863
Change-Id: I67d5ad6e7c4d486b3d4ebb25be77998173cee5a9
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56985
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
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Move bcd2bin() / bin2bcd() functions to commonlib/bsd/include/
Also, the license is changed from GPL to BSD.
This is because it is needed from "utils" (see CL in the chain).
For reference bin2bcd() & bcd2bin() are very simple functions.
There are already BSD implementations, like these ones (just to
name a few):
https://chromium.googlesource.com/chromiumos/platform/mosys/+/refs/heads/main/include/lib/math.h#67
http://web.mit.edu/freebsd/head/sys/contrib/octeon-sdk/cvmx-cn3010-evb-hs5.c
BUG=b:172210863
TEST=make (everything compiled Ok).
Change-Id: If2eba82da35838799bcbcf38303de6bd53f7eb72
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56904
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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Add a new tool that that prints elog events.
The tool, as input, accepts either a file with the RW_ELOG contents, or
if the file is not provided it reads the contents of RW_ELOG by calling
the "flashrom" tool.
The tool is based on "mosys eventlog list"[1]. For the moment it only
supports "list", but future commits will add additional functionality.
This commit also adds missing ELOG defines needed for the tool. These
defines are added with the rest of the ELOG defines, in
include/commonlib/bsd/elog.h
The tool is placed inside util/cbfstool. The rationale behind the
decision, is that this tool shares a lot in common with the other tools
located in cbfstool: vboot dependency, shared files like common.o and
valstr.o, and in spirit is similar to some of the tools located in
cbfstool/.
As an example, you call the tool like the following:
$ elogtool list -f rw_elog_dump.bin
[1]: https://chromium.googlesource.com/chromiumos/platform/mosys/+/refs/heads/main/lib/eventlog/elog.c
BUG=b:172210863
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Change-Id: Ia1fe1c9ed3c4c6bda846055d4b10943b54463935
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56406
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
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Move ELOG defines and structs from include/elog.h to
include/comonlib/bsd/elog.h.
This is needed because the will be used from util/
(in a future commit).
It also replaces uNN types with uintNN_t types, for the reason described
above.
BUG=b:172210863
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Change-Id: I4f307f599a311810df2367b7c888f650cff1214a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56405
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
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Move elog_internal.h to commonlib/bsd/include/bsd/.
And rename it from elog_internal.h to elog.h.
Since this file will be included from util/ it also converts the "uNN"
types into "uintNN_t" types.
The two defines that are not used by util/ are moved to
drivers/elog/elog.c, the only file that includes them.
Move also the function elog_verify_header() from drivers/elog/, to
commonlib/bsd/elog.c since this function will be called from util/
as well.
The rationale behind moving elog's defines & structs to
commonlib/bsd/include is to make them available to util/ tools and/or
payloads (should it be needed in the future).
The files that are being relicensed to BSD were coded by Duncan Laurie,
and he is Ok with the relicense.
BUG=b:172210863
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Change-Id: Ia1aefea705ddd417a1d9e978bb18ab6d9a60cad6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56404
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
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The GENMASK is defined in multiple files (with various names such as
MASKBIT), which sets certain consecutive bits to 1 and leaves the others
to 0. To avoid duplicate macros, add GENMASK macro to helpers.h.
GENMASK(high, low) sets bits from `high` to `low` (inclusive) to 1. For
example, GENMASK(39, 21) gives us the 64-bit vector 0x000000ffffe00000.
Remove duplicate macro definitions. Also utilize GENMASK for _BF_MASK in
mmio.h.
BUG=none
TEST=make tests/commonlib/bsd/helpers-test
TEST=emerge-cherry coreboot
BRANCH=none
Change-Id: If2e7c4827d8a7d27688534593b556a72f16f0c2b
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56543
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
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Introduce a macro retry(attempts, condition, expr) for retrying a
condition, which is extensively used in coreboot.
Example usage:
if (!retry(3, read32(REG) == 0, mdelay(1))
printk(BIOS_ERR, "Error waiting for REG to be 0\n");
BUG=none
TEST=make tests/commonlib/bsd/helpers-test
TEST=emerge-cherry coreboot
BRANCH=none
Change-Id: I421e4dcab949616bd68b3a14231da744b9f74eeb
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55778
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
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Order of bits in bitfields is implementation-defined. This makes them
non-portable, especially across systems using different endianness.
This change removes bitfields and uses masking and shifting instead.
Signed-off-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Change-Id: Ief7d87ddb25c9baa931f27dbd54a4ca730b6ece7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55040
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
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cbfs_mcache_real_size() has a subtle flaw: when the cache is perfectly
full to the end (so that the termination token sits exactly at the end
of the available space), the loop counting the size ends prematurely.
This means that when migrating the cache to CBMEM the terminating token
is not copied, which isn't actually noticeable unless you're looking for
a file that's not in the cache (because it doesn't exist or because not
all files fit when building).
This patch fixes the problem and slightly changes the error message for
when a cache isn't terminated (to make it more clear that this is a
different condition from a "normal" cache overflow that can happen when
building if there's not enough room to fit all files).
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I8d89e7dadc958f97b173b3a2352f2010c8a3d1d5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52200
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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This patch adds file data hashing for CONFIG_CBFS_VERIFICATION. With
this, all CBFS accesses using the new CBFS APIs (cbfs_load/_map/_alloc
and variants) will be fully verified when verification is enabled. (Note
that some use of legacy APIs remains and thus the CBFS_VERIFICATION
feature is not fully finished.)
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: Ic9fff279f69cf3b7c38a0dc2ff3c970eaa756aa8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52084
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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The CBFS stage header is part of the file data (not the header) from
CBFS's point of view, which is problematic for verification: in pre-RAM
environments, there's usually not enough scratch space in CBFS_CACHE to
load the full stage into memory, so it must be directly loaded into its
final destination. However, that destination is decided from reading the
stage header. There's no way we can verify the stage header without
loading the whole file and we can't load the file without trusting the
information in the stage header.
To solve this problem, this patch changes the CBFS stage format to move
the stage header out of the file contents and into a separate CBFS
attribute. Attributes are part of the metadata, so they have already
been verified before the file is loaded.
Since CBFS stages are generally only meant to be used by coreboot itself
and the coreboot build system builds cbfstool and all stages together in
one go, maintaining backwards-compatibility should not be necessary. An
older version of coreboot will build the old version of cbfstool and a
newer version of coreboot will build the new version of cbfstool before
using it to add stages to the final image, thus cbfstool and coreboot's
stage loader should stay in sync. This only causes problems when someone
stashes away a copy of cbfstool somewhere and later uses it to try to
extract stages from a coreboot image built from a different revision...
a debugging use-case that is hopefully rare enough that affected users
can manually deal with finding a matching version of cbfstool.
The SELF (payload) format, on the other hand, is designed to be used for
binaries outside of coreboot that may use independent build systems and
are more likely to be added with a potentially stale copy of cbfstool,
so it would be more problematic to make a similar change for SELFs. It
is not necessary for verification either, since they're usually only
used in post-RAM environments and selfload() already maps SELFs to
CBFS_CACHE before loading them to their final destination anyway (so
they can be hashed at that time).
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I8471ad7494b07599e24e82b81e507fcafbad808a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46484
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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This patchs adds a new CBFS primitive that allows callers to pass in an
allocator function that will be called once the size of the file to load
is known, to decide on its final location. This can be useful for
loading a CBFS file straight into CBMEM, for example. The new primitive
is combined with cbfs_map() and cbfs_load() into a single underlying
function that can handle all operations, to reduce the amount of code
that needs to be duplicated (especially later when file verification is
added). Also add a new variation that allows restraining or querying the
CBFS type of a file as it is being loaded, and reorganize the
documentation/definition of all these accessors and variations in the
header file a little.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I5fe0645387c0e9053ad5c15744437940fc904392
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49334
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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<endian.h> should never be included directly in commonlib files and
should instead be chain-included via <commonlib/bsd/sysincludes.h>.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: Ibc67ea97da36ec58738236ef22f961d9bbaf8574
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50630
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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Attribute tags are defined as hexadecimal constants, not decimal, so it
makes more sense to print them like that in error messages as well.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I3a5a6a8c9b8d24e57633595fc47221a483d8593a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48836
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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cbfstool has always had a CBFS_FILENAME_ALIGN that forces the filename
field to be aligned upwards to the next 16-byte boundary. This was
presumably done to align the file contents (which used to come
immediately after the filename field).
However, this hasn't really worked right ever since we introduced CBFS
attributes. Attributes come between the filename and the contents, so
what this code currently does is fill up the filename field with extra
NUL-bytes to the boundary, and then just put the attributes behind it
with whatever size they may be. The file contents don't end up with any
alignment guarantee and the filename field is just wasting space.
This patch removes the old FILENAME_ALIGN, and instead adds a new
alignment of 4 for the attributes. 4 seems like a reasonable alignment
to enforce since all existing attributes (with the exception of weird
edge cases with the padding attribute) already use sizes divisible by 4
anyway, and the common attribute header fields have a natural alignment
of 4. This means file contents will also have a minimum alignment
guarantee of 4 -- files requiring a larger guarantee can still be added
with the --alignment flag as usual.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I43f3906977094df87fdc283221d8971a6df01b53
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47827
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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After the mcache is copied into CBMEM, it has *just* the right size to
fit the final tag with no room to spare. That means the test to check if
we walked over the end must be `current + sizeof(tag) <= end`, not
`current + sizeof(tag) < end`.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I25a0d774fb3294bb4d15f31f432940bfccc84af0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48277
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
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This patch adds the first stage of the new CONFIG_CBFS_VERIFICATION
feature. It's not useful to end-users in this stage so it cannot be
selected in menuconfig (and should not be used other than for
development) yet. With this patch coreboot can verify the metadata hash
of the RO CBFS when it starts booting, but it does not verify individual
files yet. Likewise, verifying RW CBFSes with vboot is not yet
supported.
Verification is bootstrapped from a "metadata hash anchor" structure
that is embedded in the bootblock code and marked by a unique magic
number. This anchor contains both the CBFS metadata hash and a separate
hash for the FMAP which is required to find the primary CBFS. Both are
verified on first use in the bootblock (and halt the system on failure).
The CONFIG_TOCTOU_SAFETY option is also added for illustrative purposes
to show some paths that need to be different when full protection
against TOCTOU (time-of-check vs. time-of-use) attacks is desired. For
normal verification it is sufficient to check the FMAP and the CBFS
metadata hash only once in the bootblock -- for TOCTOU verification we
do the same, but we need to be extra careful that we do not re-read the
FMAP or any CBFS metadata in later stages. This is mostly achieved by
depending on the CBFS metadata cache and FMAP cache features, but we
allow for one edge case in case the RW CBFS metadata cache overflows
(which may happen during an RW update and could otherwise no longer be
fixed because mcache size is defined by RO code). This code is added to
demonstrate design intent but won't really matter until RW CBFS
verification can be supported.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I8930434de55eb938b042fdada9aa90218c0b5a34
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41120
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
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This patch reduces some code duplication in cbfstool by switching it to
use the CBFS data structure definitions in commonlib rather than its own
private copy. In addition, replace a few custom helpers related to hash
algorithms with the official vboot APIs of the same purpose.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I22eae1bcd76d85fff17749617cfe4f1de55603f4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41117
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Wim Vervoorn <wvervoorn@eltan.com>
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This patch adapts cbfs_load() and cbfs_map() to use the new CBFS API
directly, rather than through cbfs_boot_locate(). For cbfs_load() this
means that attribute metadata does not need to be read twice.
Change-Id: I754cc34b1c1471129e15475aa0f1891e02439a02
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39305
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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This patch adds a new CBFS "mcache" (metadata cache) -- a memory buffer
that stores the headers of all CBFS files. Similar to the existing FMAP
cache, this cache should reduce the amount of SPI accesses we need to do
every boot: rather than having to re-read all CBFS headers from SPI
flash every time we're looking for a file, we can just walk the same
list in this in-memory copy and finally use it to directly access the
flash at the right position for the file data.
This patch adds the code to support the cache but doesn't enable it on
any platform. The next one will turn it on by default.
Change-Id: I5b1084bfdad1c6ab0ee1b143ed8dd796827f4c65
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38423
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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