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gh-136912: fix handling of OverflowError in hmac.digest #136917

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@picnixz picnixz commented Jul 21, 2025

@picnixz picnixz requested a review from gpshead as a code owner July 21, 2025 10:06
@picnixz picnixz force-pushed the fix/hmac/catch-overflow-error-136912 branch 5 times, most recently from 99d62fe to d0079c6 Compare July 21, 2025 10:25
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picnixz commented Jul 21, 2025

!buildbot bigmem

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit d0079c6 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F136917%2Fmerge

The command will test the builders whose names match following regular expression: bigmem

The builders matched are:

  • aarch64 Ubuntu 22.04 BigMem PR
  • AMD64 Windows11 Bigmem PR

@picnixz picnixz marked this pull request as draft July 21, 2025 14:36
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picnixz commented Jul 21, 2025

!buildbot bigmem

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit f93e1ba 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F136917%2Fmerge

The command will test the builders whose names match following regular expression: bigmem

The builders matched are:

  • aarch64 Ubuntu 22.04 BigMem PR
  • AMD64 Windows11 Bigmem PR

@picnixz picnixz marked this pull request as ready for review July 21, 2025 16:03
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picnixz commented Jul 21, 2025

!buildbot bigmem

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit df36d7d 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F136917%2Fmerge

The command will test the builders whose names match following regular expression: bigmem

The builders matched are:

  • aarch64 Ubuntu 22.04 BigMem PR
  • AMD64 Windows11 Bigmem PR

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picnixz commented Jul 21, 2025

!buildbot bigmem

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit 74239be 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F136917%2Fmerge

The command will test the builders whose names match following regular expression: bigmem

The builders matched are:

  • aarch64 Ubuntu 22.04 BigMem PR
  • AMD64 Windows11 Bigmem PR

@picnixz picnixz marked this pull request as draft July 21, 2025 17:26
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picnixz commented Jul 21, 2025

I'll rewrite this PR tomorrow to use suggestion 4.

@@ -241,13 +241,23 @@ def digest(key, msg, digest):
if _hashopenssl and isinstance(digest, (str, _functype)):
try:
return _hashopenssl.hmac_digest(key, msg, digest)
except OverflowError:
try:
return _hashopenssl.hmac_new(key, msg, digest).digest()
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@gpshead This will create a real HMAC object using OpenSSL and handles chunks in C. Alternatively, I can just catch the OverflowError directly and ignore it. The pure Python implementation already handles chunks as we just call .update() which is implemented in C as well.

@picnixz picnixz force-pushed the fix/hmac/catch-overflow-error-136912 branch 4 times, most recently from 1188f4a to 84ea348 Compare July 22, 2025 07:22
@picnixz picnixz force-pushed the fix/hmac/catch-overflow-error-136912 branch from 84ea348 to 7e01d44 Compare July 22, 2025 07:24
@picnixz picnixz force-pushed the fix/hmac/catch-overflow-error-136912 branch from 7e01d44 to 1082bd5 Compare July 22, 2025 07:24
@picnixz picnixz marked this pull request as ready for review July 22, 2025 07:25
@picnixz picnixz added needs backport to 3.14 bugs and security fixes and removed awaiting core review labels Jul 22, 2025
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picnixz commented Jul 22, 2025

!buildbot bigmem

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit 1082bd5 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F136917%2Fmerge

The command will test the builders whose names match following regular expression: bigmem

The builders matched are:

  • aarch64 Ubuntu 22.04 BigMem PR
  • AMD64 Windows11 Bigmem PR

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3 participants