Messages in this thread | | | Date | Fri, 9 Dec 2016 18:14:59 +1000 | From | Nicholas Piggin <> | Subject | Re: [PATCH] x86/kbuild: enable modversions for symbols exported from asm |
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On Fri, 9 Dec 2016 08:55:51 +0100 Stanislav Kozina <skozina@redhat.com> wrote:
> >> The question is how to provide a similar guarantee if a different way? > > As a tool to aid distro reviewers, modversions has some value, but the > > debug info parsing tools that have been mentioned in this thread seem > > superior (not that I've tested them). > > On the other hand the big advantage of modversions is that it also > verifies the checksum during runtime (module loading). In other words, I > believe that any other solution should still generate some form of > checksum/watermark which can be easily checked for compatibility on > module load. > It should not be hard to add to the DWARF based tools though. We'd just > parse DWARF data instead of the C code.
A runtime check is still done, with per-module vermagic which distros can change when they bump the ABI version. Is it really necessary to have more than that (i.e., per-symbol versioning)?
Thanks, Nick
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