Bug 815314
| Summary: | bash range expansion with large numbers causes DoS | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | ojab <bugzilla.redhat.com> |
| Component: | bash | Assignee: | Roman Rakus <rrakus> |
| Status: | CLOSED NOTABUG | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 16 | CC: | maxamillion, rrakus, tsmetana |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2012-04-23 12:53:39 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: | |||
This is expected behaviour. It was several times discussed upstream. You should use c-style for cycle in this case. |
Description of problem: I'm using bash for loops with large-number ranges like {99450..99459} and one time typo led me to {994450..99459}, which led me to unresponsive system till OOM-killer. Version-Release number of selected component (if applicable): Name : bash Arch : x86_64 Version : 4.2.24 Release : 1.fc16 Steps to Reproduce: 1. for i in {1..9999999}; do echo ${i} ; done Actual results: bash that cannot be killed via Ctrl-C/`kill` (`kill -9` works) and eats a LOT of RAM. Expected results: Expansion works or throws error (`too large number` or something like) Additional info: Also reproducible on Centos-5.8 x86_64.