9268 2016-03-15 19:47:35 +0000 bug in relocate_sdk.py 2016-03-31 23:16:02 +0000 1 1 7 Build System, Metadata & Runtime OE-Core Scripts and Tools 2.1 x86 Multiple RESOLVED FIXED High major 1.4.5 1 juro.bystricky juro.bystricky maciej.borzecki ross.burton --- --- No (bug/feature does not impact docs) oldest_to_newest 59984 0 juro.bystricky 2016-03-15 19:47:35 +0000 The script relocate_sdk.py contains a bug(s) that can cause to install an SDK with incorrectly relocated/corrupted files. If installing the SDK into a non-default location and if the path to the new SDK location is longer than the path of the default SDK location, we will overwrite some data inadvertently. The intent is to write 4096 bytes, but we will in fact end up writing more than that, easily proved by a printout: ... while (offset + 4096) <= sh_size: path = f.read(4096) new_path = old_prefix.sub(new_prefix, path) # pad with zeros new_path += b("\0") * (4096 - len(new_path)) #print "Changing %s to %s at %s" % (str(path), str(new_path), str(offset)) # write it back f.seek(sh_offset + offset) print("Write length: %i" % (len(new_path))) f.write(new_path) .... This will overwrite/corrupt the beginning of the next entry we want to process. The reason we do not always observe the problem is (IMHO) because there is another bug, related to file flushing, basically compensating the overwriting bug. I believe adding an explicit flush to the code proves my point: # write it back f.seek(sh_offset + offset) print("Write length: %i" % (len(new_path))) f.write(new_path) f.flush() The flush should make no difference, yet it will guarantee an entry to be overwritten (if the conditions are "right": i.e. new_path longer than 4096). Similar code is used in two places. At first I observed this with a python3 system, but it turns out it has nothing to do with python3, it was also observed with python2 and installing SDK on a NFS mounted drive (most likely due to some differences in fflush) The remedy would be to ensure we always write 4096 bytes without the assumption that len(new_path) is 4096 bytes. 59985 1 3031 juro.bystricky 2016-03-15 20:25:49 +0000 Created attachment 3031 relocate_sdk.py with multiple printouts 60457 2 juro.bystricky 2016-03-28 23:03:37 +0000 A patch that fixes this issue was merged: http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=c3c793b4286367b7050c8ec92fb90a1a9f85a89a The patch fixes the relocation of the section ".gccrelocprefix". That fixes the observed problems. However, similar fix is still needed for the relocation of the section ".ldsocache". 60561 3 juro.bystricky 2016-03-31 00:45:18 +0000 Sent a patch to the mailing list. 60612 4 juro.bystricky 2016-03-31 15:36:20 +0000 http://lists.openembedded.org/pipermail/openembedded-core/2016-March/119715.html 60638 5 juro.bystricky 2016-03-31 23:16:02 +0000 Merged: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?h=master-next&id=4dde12f17b5c0e8b029272284b9013cdef5ccd60 3031 2016-03-15 20:25:49 +0000 2016-03-15 20:25:49 +0000 relocate_sdk.py with multiple printouts relocate_sdk.py text/x-python 9322 juro.bystricky IyEvdXNyL2Jpbi9lbnYgcHl0aG9uCiMKIyBDb3B5cmlnaHQgKGMpIDIwMTIgSW50ZWwgQ29ycG9y YXRpb24KIwojIFRoaXMgcHJvZ3JhbSBpcyBmcmVlIHNvZnR3YXJlOyB5b3UgY2FuIHJlZGlzdHJp YnV0ZSBpdCBhbmQvb3IgbW9kaWZ5CiMgaXQgdW5kZXIgdGhlIHRlcm1zIG9mIHRoZSBHTlUgR2Vu ZXJhbCBQdWJsaWMgTGljZW5zZSB2ZXJzaW9uIDIgYXMKIyBwdWJsaXNoZWQgYnkgdGhlIEZyZWUg U29mdHdhcmUgRm91bmRhdGlvbi4KIwojIFRoaXMgcHJvZ3JhbSBpcyBkaXN0cmlidXRlZCBpbiB0 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