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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

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    Tavis Ormandy‏Verified account @taviso 27 Aug 2019
    • Report Tweet
    • Report NetzDG Violation

    Interesting, a mysterious bug report I've been struggling to track down just got solved. It turns out, 32-bit getcontext() can return failure if run inside a docker container. Apparently the cause is the default docker seccomp policy doesn't allow sigprocmask() (wtf?). 😓

    10:23 AM - 27 Aug 2019
    • 21 Retweets
    • 140 Likes
    • Charles Ellis M Evan Prasant kumar suman ♏ark Lewis Tinker Fairy mushu 👾♥λ cryptopotato DP
    7 replies 21 retweets 140 likes
      1. New conversation
      2. Rich Felker‏ @RichFelker 27 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @taviso

        Does it abort or silently fail? The latter is CVE-worthy.

        2 replies 0 retweets 7 likes
      3. Tavis Ormandy‏Verified account @taviso 27 Aug 2019
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        Replying to @RichFelker

        Silently fail. The docs say no errors defined, and my mental model was just a wrapper around pushad, etc, etc. I didn't expect it to go wrong, so tracking down the bug was a nightmare 😬

        5 replies 0 retweets 15 likes
      4. 10 more replies
      1. New conversation
      2. Omri Kurtz‏ @OmriKurtz 28 Aug 2019
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        Replying to @taviso

        Sigprocmask is deprecated, therefore denied by the seccomp policy. The 64 bit version uses the newer rt_sigprocmask.

        1 reply 0 retweets 0 likes
      3. Tavis Ormandy‏Verified account @taviso 28 Aug 2019
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        Replying to @OmriKurtz

        It may be deprecated, but it's still used by glibc. I don't think it's okay to break glibc.

        0 replies 0 retweets 4 likes
      4. End of conversation
      1. Rockj‏ @rockjodd 27 Aug 2019
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        Replying to @taviso

        Amazing all the finds you find. A really big thank you from a software user who approves of getting security patches. You're an invisible hero for a lot of users!

        0 replies 0 retweets 4 likes
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      1. Nebi Senol YILMAZ‏ @nsyilmaz 27 Aug 2019
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        Replying to @taviso

        It sounds like a silently fail, but hope there is a comment like ‘to be fixed’, otherwise it will be a real fail 🙈

        0 replies 0 retweets 1 like
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      1. Brad Geesaman‏ @bradgeesaman 27 Aug 2019
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        Replying to @taviso

        @jessfraz ☝️

        0 replies 0 retweets 1 like
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      1. Youcef Benhamid‏ @YBenhamid 27 Aug 2019
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        Replying to @taviso

        If it is not verifiable open source it may contain planted bugs on purpose.

        0 replies 0 retweets 1 like
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      1. New conversation
      2. Matthew Fernandez‏ @smattrr 27 Aug 2019
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        Replying to @taviso

        Is this a vDSO thing?https://lwn.net/Articles/795128/ …

        1 reply 0 retweets 0 likes
      3. Aleksa Sarai [see §317C(6)]‏ @lordcyphar 28 Aug 2019
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        Replying to @smattrr @taviso

        vDSOs are only really used for time-related "syscalls". Signal-related syscalls are definitely "real". Looks much more likely that the default Docker seccomp profile has a bug.

        0 replies 0 retweets 1 like
      4. End of conversation

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