Public bug reported: glibc: strstr(): Invalid result if needle crosses page on s390-z15 ifunc variant. If the specified needle crosses a page-boundary, the s390-z15 ifunc variant of strstr truncates the needle which results in invalid results.
Example: needle = "Hello" <page-boundary> "World" really used needle = "Hello" haystack = "abc HelloBug def" result = "HelloBug def" This only happens if the needle before page-boundary contains 9 or less characters. See upstream-glibc bugzilla "Bug 25226 - strstr: Invalid result if needle crosses page on s390-z15 ifunc variant." (https://sourceware.org/bugzilla/show_bug.cgi?id=25226) Fixed with upstream-glibc commit "S390: Fix handling of needles crossing a page in strstr z15 ifunc-variant. [BZ #25226]" (https://sourceware.org/git/?p=glibc.git;a=commit;h=bfdb731438206b0f70fe7afa890681155c30b419) Please backport this commit to Ubuntu 19.10, which includes glibc 2.30 Already backported to upstream-glibc-release-branch-2.30: https://sourceware.org/git/?p=glibc.git;a=commit;h=f4419b0d0181da28f18cba40068f2e75300f5020 glibc 2.31 (tentativ GA 2020-02-01) will have this fix integrated. If this version will not be picked finally, than this fix is also needed for 20.04 ** Affects: ubuntu-z-systems Importance: High Assignee: Skipper Bug Screeners (skipper-screen-team) Status: Triaged ** Affects: glibc (Ubuntu) Importance: High Assignee: Canonical Foundations Team (canonical-foundations) Status: New ** Affects: glibc (Ubuntu Eoan) Importance: Undecided Status: New ** Tags: architecture-s39064 bugnameltc-182602 severity-high targetmilestone-inin1910 ** Tags added: architecture-s39064 bugnameltc-182602 severity-high targetmilestone-inin1910 ** Changed in: ubuntu Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team) ** Package changed: ubuntu => glibc (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1854326 Title: [UBUNTU] - glibc: z15 (s390x) strstr implementation can return incorrect result if search string cross page boundary To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1854326/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
