Bug 1126463
| Summary: | test fails when openssl is compiled with gcc-4.9.1-2.fc21.1 | ||||||
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| Product: | [Fedora] Fedora | Reporter: | Michal Toman <mtoman> | ||||
| Component: | gcc | Assignee: | Jakub Jelinek <jakub> | ||||
| Status: | CLOSED RAWHIDE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | unspecified | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 21 | CC: | jakub, law, rvokal | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | s390 | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | gcc-4.9.1-7.fc21 | Doc Type: | Bug Fix | ||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2014-09-29 16:05:53 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 467765 | ||||||
| Attachments: |
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Can you turn this into a self-contained testcase? I.e. create a short main that will populate the SHA512_CTX with some values that show the miscompilation, point it to unsigned long long array filled, call sha512_block_data_order with those arguments and after calling it e.g. compare SHA512_CTX content if it is the expected one? Thanks. Now tracked upstream as PR62025. |
Created attachment 923877 [details] sha512.i The sha512t test fails when openssl is compiled with gcc-4.9.1-2.fc21.1.s390 with -O2, while -O1 and -O0 work correctly. I have tracked the problem down to function sha512_block_data_order from file crypto/sha/sha512.c. Prefixing the function with __attribute__((optimize (0))) fixes the problem. __attribute__((noinline,noclone)) does not help - the test is still failing. The program does not crash, it just calculates a wrong result. Attaching the preprocessed source.