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bpo-35214: Disable getc_unlocked() with MemorySanitizer. #10499

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Merged
merged 1 commit into from
Nov 13, 2018
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bpo-35214: Disable getc_unlocked() with MemorySanitizer. #10499

merged 1 commit into from
Nov 13, 2018

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@gpshead
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@gpshead gpshead commented Nov 13, 2018 •
edited by bedevere-bot
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clang's MemorySanitizer understand getc() but does not understand
getc_unlocked(). Workaround: Don't use it on msan builds.

https://bugs.python.org/issue35214
@gpshead
Disable getc_unlocked() with MemorySanitizer.
43a31f4 
clang's MemorySanitizer understand getc() but does not understand getc_unlocked(). Workaround: Don't use it on msan builds.
@gpshead gpshead self-assigned this Nov 13, 2018
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alex commented Nov 13, 2018

Is there a bug filed with MSAN (compiler-rt) for this?
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gpshead commented Nov 13, 2018

Is there a bug filed with MSAN (compiler-rt) for this?

Looking into that... Someone on our internal clang team said this (in 2015) on an internal bug that was was fixed using this workaround instead because of:

"""This can be fixed in MSan, but it may take time. The whole thing is quite messy: _unlocked IO functions access internals of FILE* in glibc headers, which means that MSan needs to catch all cases when glibc (an uninstrumented library) updates buffer pointers inside FILE and unpoison the new target region.

Disabling HAVE_GETC_UNLOCKED under #ifdef MEMORY_SANITIZER is definitely better than what we have now."""

I'm pointing them here to see if anything about that has changed (I'd assume not) while I wait for a clang compiler-rt bugzilla account to be created for me.
@gpshead gpshead merged commit e6c77d8 into python:master Nov 13, 2018
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miss-islington commented Nov 13, 2018

Thanks @gpshead for the PR 🌮🎉.. I'm working now to backport this PR to: 3.6, 3.7.
🐍🍒⛏🤖
@gpshead gpshead deleted the msan-vs-getc_unlocked branch November 13, 2018 03:47
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bedevere-bot commented Nov 13, 2018

GH-10500 is a backport of this pull request to the 3.7 branch.
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Nov 13, 2018
@gpshead @miss-islington
Disable getc_unlocked() with MemorySanitizer. (pythonGH-10499)
3fcc145 
clang's MemorySanitizer understand getc() but does not understand getc_unlocked(). Workaround: Don't use it on msan builds. (cherry picked from commit e6c77d8) Co-authored-by: Gregory P. Smith <greg@krypto.org>
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bedevere-bot commented Nov 13, 2018

GH-10501 is a backport of this pull request to the 3.6 branch.
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Nov 13, 2018
@gpshead @miss-islington
Disable getc_unlocked() with MemorySanitizer. (pythonGH-10499)
d8d997b 
clang's MemorySanitizer understand getc() but does not understand getc_unlocked(). Workaround: Don't use it on msan builds. (cherry picked from commit e6c77d8) Co-authored-by: Gregory P. Smith <greg@krypto.org>
miss-islington added a commit that referenced this pull request Nov 13, 2018
@miss-islington @gpshead
Disable getc_unlocked() with MemorySanitizer. (GH-10499)
f0b21e1 
clang's MemorySanitizer understand getc() but does not understand getc_unlocked(). Workaround: Don't use it on msan builds. (cherry picked from commit e6c77d8) Co-authored-by: Gregory P. Smith <greg@krypto.org>
miss-islington added a commit that referenced this pull request Nov 13, 2018
@miss-islington @gpshead
Disable getc_unlocked() with MemorySanitizer. (GH-10499)
41fdbaa 
clang's MemorySanitizer understand getc() but does not understand getc_unlocked(). Workaround: Don't use it on msan builds. (cherry picked from commit e6c77d8) Co-authored-by: Gregory P. Smith <greg@krypto.org>
@gpshead gpshead mentioned this pull request Aug 22, 2023
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