Greetings,

Yes, I keep spamming this trying to find an appropriate mailing list. I don't remember how or why I initially stumbled across this bug report (https://bugs.launchpad.net/ubuntu/+source/bc/+bug/1775776), but, given that
I have some familiarity with GNU bc, I decided to fix some of the issues.
Turns out, this also seems to fix the crashes reported here (https://www.openwall.com/lists/oss-security/2018/11/28/1). I think it would
be a lot more useful to share this, as there isn't a lot to review. There are three bug fixes and some self-defensive checks in the runtime for malformed bytecode. Address Sanitizer tells me that these previously invalid memory references now just leak memory. I don't appear to have broken anything in the process, either. I'm not a member of any Debian mailing list, but I will try
to watch for responses.

Just trying to be somewhat helpful,
Thomas DiModica

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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Sat, Aug 06, 2022 at 05:12:13AM +0000, Thomas DiModica wrote:

Yes, I keep spamming this trying to find an appropriate mailing list. I don't remember how or why I initially stumbled across this bug report (https://bugs.launchpad.net/ubuntu/+source/bc/+bug/1775776), but, given that I have some familiarity with GNU bc, I decided to fix some of the issues. Turns out, this also seems to fix the crashes reported here (https://www.openwall.com/lists/oss-security/2018/11/28/1). I think it would be a lot more useful to share this, as there isn't a lot to review. There are three bug fixes and some self-defensive checks in the runtime for malformed bytecode. Address Sanitizer tells me that these previously invalid memory references now just leak memory. I don't appear to have broken anything in the
process, either. I'm not a member of any Debian mailing list, but I will try to watch for responses.

Please send such patches upstream.


--
WBR, wRAR

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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Hi Thomas,

Thomas DiModica <[email protected]> writes:

Greetings,

Yes, I keep spamming this trying to find an appropriate mailing list. I don't remember how or why I initially stumbled across this bug report (https://bugs.launchpad.net/ubuntu/+source/bc/+bug/1775776), but, given that I have some familiarity with GNU bc, I decided to fix some of the issues. Turns out, this also seems to fix the crashes reported here (https://www.openwall.com/lists/oss-security/2018/11/28/1). I think it would be a lot more useful to share this, as there isn't a lot to review. There are three bug fixes and some self-defensive checks in the runtime for malformed bytecode. Address Sanitizer tells me that these previously invalid memory references now just leak memory. I don't appear to have broken anything in the
process, either. I'm not a member of any Debian mailing list, but I will try to watch for responses.

Just trying to be somewhat helpful,

I took your patch, and created a merge request on our gitlab instance:

https://salsa.debian.org/debian/bc/-/merge_requests/4

The patch has been slightly modified, to make it cleanly apply -- perhaps
you'd be kind enough to check that I've not broken anything:

https://salsa.debian.org/philh/bc/-/blob/ricinwich/debian/patches/09_crash-fixes.diff

I note that bc doesn't see much activity, so I've no idea how long it
might be before this makes its way into a release of the package, but at
least this way it will not simply be forgotten on the mailing-list.

BTW you are welcome to create an account on salsa.debian.org if you wish
to contribute directly there.

Cheers, Phil.
--
|)| Philip Hands [+44 (0)20 8530 9560] HANDS.COM Ltd.
|-| http://www.hands.com/ http://ftp.uk.debian.org/
|(| Hugo-Klemm-Strasse 34, 21075 Hamburg, GERMANY

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Philip, thank you,

I'm sorry: I have sent this to upstream, but haven't heard anything from them. At least with a mailing list, I get feedback as to whether or not my mail was eaten by the void of the Internet. Also, if it gets into Debian, then the patches filter through to everything based on Debian.

Philip, your change to the patch looks right. Sorry, I based the patch off upstream. You do say it needs a better description, so I'm going to try to
give you a sense of what's going on.

What I think is happening is that, somewhere in the parser, "that an error occurred" is getting suppressed, and the parser continues to generate bytecode with the previous instruction incomplete, and then it tries to execute that. Sometimes, the bytecode reads an instruction while trying to read a reference. This appears to be most catastrophic in array handling. While what ought to be fixed is the code generation to not generate these erroneous references, it is easier to fix the bytecode interpreter to defend itself from them.

To begin, starting in execute.c: for change one, it has read a label number, but then walks off the list looking for it. In change two, sometimes the function number is invalid. And change three protects from the string not
being terminated. Looking at this again, if I had just added an 'else' to
"if (ch != '\\')" then I could have made a less invasive change. Also: if you want to give any of these error messages better text, or if I've broken the internationalization with them, please change them to suite your preferences. What I gave you is better than the "DANGER, WILL ROBINSON!" that I had before.

In storage.c, initializing 'v_next' is one of the things I consider a bug. Sometimes, it has a "valid" pointer in it. The next six changes are defensive error checks to ensure that the array being requested is plausible. The line "params++;" looks like a hold-over from an earlier version of the code, where the parameters were stored in an array. With the linked-list, the proper way
to advance to the next parameter is "params = params->next;", which always occurs a few lines later.

That leaves util.c. I think they were trying to save memory, at some point. Possibly: variable names are treated differently from array and function
names, and I don't see the reason for that. What happens is that the value
from lookup() is used to initialize av_name in nextarg(). Then, av_name is directly used to index v_names right above that removed "params++;" line. In this retrospective dive through the code, that may be it. The line in
storage.c could be changed, I think, but, in my opinion, it is better to move the code so that it more consistently handles all types. In addition, while
the line "if (id->v_name <= MAX_STORE)" is annoying in that it is different,
it isn't guarding against an invalid access.

Thank you again,
Thomas DiModica

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Thomas DiModica <[email protected]> writes:
...

You do say it needs a better description, so I'm going to try to
give you a sense of what's going on.

I was really saying that whoever feels competent to decide to accept the
Merge Request for the bc package ought to come up with a better
description for why they think the patch should be applied to the Debian package, but I'm sure your description will help too.

Given that the patch references this thread, I'm sure it'll be found
whenever needed.

Cheers, Phil.
--
|)| Philip Hands [+44 (0)20 8530 9560] HANDS.COM Ltd.
|-| http://www.hands.com/ http://ftp.uk.debian.org/
|(| Hugo-Klemm-Strasse 34, 21075 Hamburg, GERMANY

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On Saturday, August 6, 2022 at 01:14:05 PM MDT, Philip Hands <[email protected]> wrote:

I was really saying that whoever feels competent to decide to accept the Merge Request for the bc package ought to come up with a better
description for why they think the patch should be applied to the Debian package, but I'm sure your description will help too.

I'm sure that it ought to be applied upstream, however, I've had trouble contacting upstream. Maybe this will help with that.

Thanks again,
Thomas DiModica

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Thanks, Thomas, for the patch, and Phil for the merge request. I'll take
a look at them and will try to get them reviewed/applied upstream as
well.

Best wishes,
Ryan

--
|)|/ Ryan Kavanagh | 4E46 9519 ED67 7734 268F
|\|\ https://rak.ac | BD95 8F7B F8FC 4A11 C97A

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