| Summary: |
VUL-0: CVE-2024-36489: kernel: tls: fix missing memory barrier in tls_init |
| Product: |
[Novell Products] SUSE Security Incidents
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Reporter: |
SMASH SMASH <smash_bz> |
| Component: |
Incidents | Assignee: |
Davide Benini <davide.benini> |
| Status: |
NEW
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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: |
andrea.mattiazzo, 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/411750/
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| Whiteboard: |
CVSSv3.1:SUSE:CVE-2024-36489:4.7:(AV:L/AC:H/PR:L/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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Marketing QA Status:
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IT Deployment:
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In the Linux kernel, the following vulnerability has been resolved: tls: fix missing memory barrier in tls_init In tls_init(), a write memory barrier is missing, and store-store reordering may cause NULL dereference in tls_{setsockopt,getsockopt}. CPU0 CPU1 ----- ----- // In tls_init() // In tls_ctx_create() ctx = kzalloc() ctx->sk_proto = READ_ONCE(sk->sk_prot) -(1) // In update_sk_prot() WRITE_ONCE(sk->sk_prot, tls_prots) -(2) // In sock_common_setsockopt() READ_ONCE(sk->sk_prot)->setsockopt() // In tls_{setsockopt,getsockopt}() ctx->sk_proto->setsockopt() -(3) In the above scenario, when (1) and (2) are reordered, (3) can observe the NULL value of ctx->sk_proto, causing NULL dereference. To fix it, we rely on rcu_assign_pointer() which implies the release barrier semantic. By moving rcu_assign_pointer() after ctx->sk_proto is initialized, we can ensure that ctx->sk_proto are visible when changing sk->sk_prot. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-36489 https://www.cve.org/CVERecord?id=CVE-2024-36489 https://git.kernel.org/stable/c/2c260a24cf1c4d30ea3646124f766ee46169280b https://git.kernel.org/stable/c/335c8f1566d8e44c384d16b450a18554896d4e8b https://git.kernel.org/stable/c/91e61dd7a0af660408e87372d8330ceb218be302 https://git.kernel.org/stable/c/ab67c2fd3d070a21914d0c31319d3858ab4e199c https://git.kernel.org/stable/c/d72e126e9a36d3d33889829df8fc90100bb0e071 https://git.kernel.org/stable/c/ef21007a7b581c7fe64d5a10c320880a033c837b https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-36489.mbox https://bugzilla.redhat.com/show_bug.cgi?id=2293687