| --- Log opened Thu May 10 00:00:40 2018 |
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| 04:22 | <&Derakon> | https://www.bleepingcomputer.com/news/security/poc-developed-for-coinhive-mining-in-excel-using-custom-javascript-functions/ |
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| 04:36 | < Mahal> | Saw that earlier |
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| 07:56 | <&[R]> | https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8154 |
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| 08:34 | < Vorntastic> | Neat |
| 09:06 | <&McMartin> | Wow, gg gcc |
| 09:06 | <&McMartin> | signed integer overflow is no longer undefined behavior in gcc 8 |
| 09:06 | <&McMartin> | It is now, unless specified otherwise, an instant program crash |
| 09:06 | <&[R]> | Wait what |
| 09:06 | <&[R]> | It was undefined before? |
| 09:06 | <&McMartin> | Yes. |
| 09:06 | <&[R]> | ... |
| 09:06 | <&McMartin> | Still is, in the standard. |
| 09:06 | <&[R]> | That does not seem like an improvement |
| 09:07 | <&McMartin> | Most implementations just generate the "obvious" assembly language code and bitmask the result as needed. |
| 09:07 | <&McMartin> | gcc 8 also now enables -fstrict-aliasing at -O2 and above, which is also fuckin' lol because it breaks all type punning save one form that is not the idiomatic one. |
| 09:08 | <&McMartin> | gentoo apparently attempted to switch to gcc 8 in its experimental branch |
| 09:08 | <&McMartin> | It... it didn't end well. |
| 09:08 | <&McMartin> | Fedora has also just shipped gcc8 stock in F28. |
| 09:09 | <&McMartin> | I have a new task wrt this emulator project I work on now, because yeah it turns out register simulation code often relies on what is now -fwrapv |
| 09:09 | <&McMartin> | Time to see how many of these flags exist in prior editions of gcc |
| 09:09 | <&McMartin> | I'm hoping I can just set -fno-strict-aliasing -fno-strict-overflow |
| 09:19 | <&McMartin> | Looks like those go back to at least gcc 5 |
| 09:19 | <&McMartin> | anyone here still running gcc 4? |
| 09:19 | <&McMartin> | If so, can you check for the existence of the following flags: |
| 09:19 | <&McMartin> | -fno-strict-overflow |
| 09:19 | <&McMartin> | -fwrapv |
| 09:19 | <&McMartin> | -fno-strict-aliasing |
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| 09:20 | <&[R]> | Uhhh |
| 09:21 | <&[R]> | gcc (GCC) 4.6.1 20110819 (prerelease) |
| 09:21 | <&McMartin> | Can you check your manpages for the existence of those flags? (The no- ones might be filed without the no-) |
| 09:22 | <&McMartin> | I'm going to have to gate using them in our config script anyway, but it'll be good to know that they stay spelled the same back a reasonable distance. |
| 09:23 | <&[R]> | # gcc -fno-strict-overflow -fwrapv -fno-strict-aliasing -o test test.c; echo $? |
| 09:23 | <&[R]> | 0 |
| 09:23 | <&McMartin> | \0/ |
| 09:24 | <&[R]> | See also the -fwrapv option. Using -fwrapv means that integer signed overflow is fully defined: it wraps. When -fwrapv is used, there is no difference between -fstrict-overflow and -fno-strict-overflow for integers. |
| 09:24 | <&[R]> | With -fwrapv certain types of overflow are permitted. For example, if the compiler gets an overflow when doing arithmetic on constants, the overflowed value can still be used with -fwrapv, but not otherwise. |
| 09:24 | <&McMartin> | Yeah |
| 09:24 | <&McMartin> | Since this project is an emulator, -fwrapv explicitly specifies the behavior we demand |
| 09:25 | <&[R]> | The -fstrict-aliasing option is enabled at levels -O2, -O3, -Os. |
| 09:25 | <&[R]> | No mention of no-strict-aliasing |
| 09:25 | <&McMartin> | That's covered in bulk by a paragraph above all the -f options, if it's formatted like it is for gcc8 |
| 09:25 | | Kindamoody[zZz] is now known as Kindamoody|afk |
| 09:26 | <&McMartin> | strict aliasing only breaks type punning. |
| 09:27 | <&[R]> | Also you can thank Arch for breaking for me having a really old version of GCC |
| 09:27 | <&McMartin> | www.eng.utah.edu/~cs5785/slides-f10/Dangerous+Optimizations.pdf has a good rundown of dangerous optimizations |
| 09:27 | <&[R]> | Actually, my Deli installs probably have GCC 4 as well |
| 09:28 | <&[R]> | But I forget how to set up the hardware to boot |
| 09:28 | <&[R]> | Ughhhh |
| 09:29 | <&McMartin> | I used to keep a Trusty Tahr VM around because one of the crossdev kits I had couldn't actually build on GCCs later than 4.x |
| 09:29 | <&[R]> | Why do people think that slides are a good way to share information |
| 09:29 | <&McMartin> | Because they needed to make them anyway, and sometimes they're the only artifact |
| 09:29 | <&McMartin> | Here, have a blog post instead. https://blog.regehr.org/archives/1307 |
| 09:30 | <&McMartin> | (It's only about aliasing, though) |
| 09:45 | <&McMartin> | It turns out that it wasn't wrapping before though |
| 09:46 | <&McMartin> | At -O2 on GCC 4.4 it was producing incorrect code |
| 09:46 | <&McMartin> | The slides work through several "delightful" examples |
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| 14:27 | <&ToxicFrog> | tfw you open a file and the first thing you see is a giant ascii-art skull occupying the entire first page of the file |
| 14:28 | <&[R]> | Nice |
| 14:29 | <&[R]> | So leaked document I guess? |
| 14:29 | <&[R]> | Some* |
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| 14:47 | <@mac> | ToxicFrog: I see you've started adding proper headers to your perl files~ |
| 14:53 | <&ToxicFrog> | [R]: internal source code |
| 14:53 | <&ToxicFrog> | mac: it's not perl, but for some of this that might actually be a step up |
| 15:01 | <@mac> | ToxicFrog: Ouch~ |
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| 20:08 | <&McMartin> | We use dragons in ours |
| 20:08 | <&McMartin> | I just labeled stanzas with /* HIC SUNT DRACONES */ |
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| 21:22 | < Teth> | So, when do people actually talk in here? |
| 21:23 | <~Vornicus> | When all the weirdos are gone. But this is IRC. So |
| 21:24 | < Teth> | Indeed. |
| 21:24 | <&[R]> | Oh hey |
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| 22:21 | <&[R]> | if ! grep '^TrustedUserCAKeys /etc/ssh/master.pub$' /etc/ssh/sshd_config; then sed -i '1s,^,TrustedUserCAKeys /etc/ssh/master.pub\n,' /etc/ssh/sshd_config ; fi |
| 22:21 | <&[R]> | Weeeee |
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| 23:33 | <&[R]> | $ ssh -i user/rstamer rstamer@10.0.10.12 cat .ssh/authorized_keys .ssh/config |
| 23:33 | <&[R]> | cat: .ssh/authorized_keys: No such file or directory |
| 23:33 | <&[R]> | cat: .ssh/config: No such file or directory |
| 23:33 | <&[R]> | Woo! |
| 23:42 | <&ToxicFrog> | huzzah |
| 23:42 | <&ToxicFrog> | Style nit: if ! fgrep -qx 'TrustedUserCAKeys /etc/ssh/master.pub' |
| 23:43 | <&[R]> | Ah thanks |
| 23:43 | <&[R]> | https://www.sweharris.org/post/2016-10-30-ssh-certs/ <-- following this BTW |
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| --- Log closed Fri May 11 00:00:42 2018 |