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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. William D. Jones‏ @cr1901 24 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec @RichFelker If you enabled those checks, wouldn't those checks still be there in non-conforming code anyway? >>

      1 reply 0 retweets 0 likes
    2. William D. Jones‏ @cr1901 24 Nov 2015
      Replying to @cr1901

      @CopperheadSec @RichFelker Conforming code or not, the compiler assumes signed overflow does not happen, correct?

      1 reply 0 retweets 0 likes
    3. CopperheadOS‏ @CopperheadOS 24 Nov 2015
      Replying to @cr1901

      @cr1901 @RichFelker Yes, unless you pass -fwrapv for two's complement signed arithmetic (or -fno-strict-overflow which can be less strict).

      1 reply 0 retweets 0 likes
    4. William D. Jones‏ @cr1901 24 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec @RichFelker Ahhh, brings back memories of -mtune vs -march and -ffreestanding not actually working on hosted compilers.

      1 reply 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 24 Nov 2015
      Replying to @cr1901

      @cr1901 @RichFelker For hardening, -fwrapv works in global CFLAGS with -fno-wrapv -fsanitize=signed-integer-overflow for special cases.

      2 replies 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 24 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec @cr1901 I write to the actual language, so I don't use -fwrapv. Anything needing it is a bug in my book.

      1 reply 0 retweets 0 likes
    7. CopperheadOS‏ @CopperheadOS 24 Nov 2015
      Replying to @RichFelker

      @RichFelker @cr1901 It's a bad idea to depend on it while writing code but it works well as a distribution hardening switch.

      2 replies 0 retweets 1 like
    8. CopperheadOS‏ @CopperheadOS 24 Nov 2015
      Replying to @CopperheadOS

      @RichFelker @cr1901 Since there's a lot of bad code using incorrect signed overflow checks that can be optimized out, etc.

      1 reply 0 retweets 0 likes
    9. CopperheadOS‏ @CopperheadOS 24 Nov 2015
      Replying to @CopperheadOS

      @RichFelker @cr1901 And -fwrapv really has no performance cost in the real world. It only helps on stuff like SPEC (which it breaks!).

      2 replies 0 retweets 0 likes
    10. CopperheadOS‏ @CopperheadOS 24 Nov 2015
      Replying to @CopperheadOS

      @RichFelker @cr1901 Better to enable -fsanitize=signed-integer-overflow if you're willing to take a performance hit... but breaks too much.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 24 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec @cr1901 Anything that it "breaks" in inducing a hard crash in could have silent runaway wrong behavior on modern compilers.

      2:15 PM - 24 Nov 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 24 Nov 2015
          Replying to @RichFelker

          @CopperheadSec @cr1901 I'd rather see all this software start (controlled) crashing and get fixed. :-)

          1 reply 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS 24 Nov 2015
          Replying to @RichFelker

          @RichFelker @cr1901 Definitely, it's just a lot of work and most projects aren't responsive to those kinds of patches.

          0 replies 0 retweets 0 likes
        4. End of conversation

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