Bug 2335896 (CVE-2024-56768) - CVE-2024-56768 kernel: bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP
Summary: CVE-2024-56768 kernel: bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP
Keywords:
Status: NEW
Alias: CVE-2024-56768
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-01-06 17:01 UTC by OSIDB Bzimport
Modified: 2025-01-06 18:32 UTC (History)
4 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2025-01-06 17:01:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP

On x86-64 calling bpf_get_smp_processor_id() in a kernel with CONFIG_SMP
disabled can trigger the following bug, as pcpu_hot is unavailable:

 [    8.471774] BUG: unable to handle page fault for address: 00000000936a290c
 [    8.471849] #PF: supervisor read access in kernel mode
 [    8.471881] #PF: error_code(0x0000) - not-present page

Fix by inlining a return 0 in the !CONFIG_SMP case.
Comment 1 Robb Gatica 2025-01-06 18:31:27 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025010657-CVE-2024-56768-c835@gregkh/T
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