| Summary: |
VUL-0: CVE-2021-47567: kernel: powerpc/32: Fix hardlockup on vmap stack overflow |
| Product: |
[Novell Products] SUSE Security Incidents
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Reporter: |
SMASH SMASH <smash_bz> |
| Component: |
Incidents | Assignee: |
Security Team bot <security-team> |
| Status: |
RESOLVED
INVALID
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QA Contact: |
Security Team bot <security-team> |
| Severity: |
Normal
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| Priority: |
P3 - Medium
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CC: |
carlos.lopez, jlee, mhocko
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| Version: |
unspecified | |
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| Target Milestone: |
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| Hardware: |
Other | |
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| OS: |
Other | |
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| URL: |
https://smash.suse.de/issue/407723/
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| Whiteboard: |
CVSSv3.1:SUSE:CVE-2021-47567:4.1:(AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H) |
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Found By:
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Security Response Team
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Services Priority:
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Business Priority:
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Blocker:
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---
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Marketing QA Status:
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---
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IT Deployment:
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In the Linux kernel, the following vulnerability has been resolved: powerpc/32: Fix hardlockup on vmap stack overflow Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct") a vmap stack overflow results in a hard lockup. This is because emergency_ctx is still addressed with its virtual address allthough data MMU is not active anymore at that time. Fix it by using a physical address instead. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47567 https://www.cve.org/CVERecord?id=CVE-2021-47567 https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47567.mbox