diff options
| author | Paul Fagerburg <pfagerburg@chromium.org> | 2019-09-25 09:12:24 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-09-30 11:43:28 +0000 |
| commit | 4ab023329d9212342cf6f7cfa08fb388ac7f019b (patch) | |
| tree | b1ca81931b69acc9e75fd1b7db57b168978429d7 /util | |
| parent | 39f3f52b3eb0fee0c9908e07d910270d05952c0d (diff) | |
util/mb/google/hatch: update CRC calculation for correctness
The CRC result is treated as a signed value, and so in certain
situations, the calculated value for the last four digits will not
be correct. Ensure that the CRC is treated as an unsigned 32-bit
value prior to converting the last 4 decimal digits to a string.
Signed-off-by: Paul Fagerburg <pfagerburg@chromium.org>
Change-Id: I92f9ce1ceb7450f90b89c94e0ace6f79a9419b42
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35604
Reviewed-by: Andrew McRae <amcrae@chromium.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'util')
| -rwxr-xr-x | util/mainboard/google/hatch/kconfig.py | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/util/mainboard/google/hatch/kconfig.py b/util/mainboard/google/hatch/kconfig.py index ecc24eeb49..891714b53e 100755 --- a/util/mainboard/google/hatch/kconfig.py +++ b/util/mainboard/google/hatch/kconfig.py @@ -64,8 +64,11 @@ def get_gbb_hwid(variant_name): converted to all uppercase as part of this function.""" hwid = variant_name + ' test' upperhwid = hwid.upper() - suffix = zlib.crc32(upperhwid.encode('UTF-8')) % 10000 - gbb_hwid = upperhwid + ' ' + str(suffix).zfill(4) + # Force conversion to unsigned by bitwise AND with (2^32)-1. + # See the docs for crc32 at https://docs.python.org/3/library/zlib.html + # for why '& 0xffffffff' is necessary. + crc = zlib.crc32(upperhwid.encode('UTF-8')) & 0xffffffff + gbb_hwid = upperhwid + ' ' + str(crc % 10000).zfill(4) return gbb_hwid |