On Wed, Dec 20, 2017 at 01:48:14PM +0300, Peter Mamonov wrote: > Hi, > > The md5sum command reports wrong sum for a file named 4k.bin and, I guess, for > other files named alike. Here are the commands to reproduce the bug: The problem lays in __do_digest() function: - it initializes variables `start` and `size` at commands/digest.c:38 - then it calls parse_area_spec(*argv, &start, &size) at commands/digest.c:42 - parse_area_spec() returns error as it should, however it changes the value of the `start` at lib/misc.c:87. - this causes digest algo to skip leading 4k of the data from the file. I'm not quite sure what is the best solution: - prevent parse_area_spec() from setting start if it fails? - reinitialize start/size after unsuccessfull call to parse_area_spec()? Regards, Peter > > barebox@barebox sandbox:/ memcpy -s /dev/zero -d _4k.bin 0 0 4k > barebox@barebox sandbox:/ md5sum _4k.bin > 620f0b67a91f7f74151bc5be745b7110 _4k.bin > > barebox@barebox sandbox:/ cp _4k.bin 4k.bin > barebox@barebox sandbox:/ md5sum 4k.bin > d41d8cd98f00b204e9800998ecf8427e 4k.bin > > barebox@barebox sandbox:/ cp 4k.bin __4k.bin > barebox@barebox sandbox:/ md5sum __4k.bin > 620f0b67a91f7f74151bc5be745b7110 __4k.bin > > barebox@barebox sandbox:/ version > > barebox 2017.12.0 #4 Wed Dec 20 12:26:57 MSK 2017 > > barebox@barebox sandbox:/ Terminated > > $ dd if=/dev/zero bs=4k count=1 | md5sum > ... > 620f0b67a91f7f74151bc5be745b7110 - > > Regards, > Peter _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
