Fix Address Emission with Tag-Based KASAN Enabled

CVE-2024-50203

What is CVE-2024-50203?

A vulnerability in the Linux kernel relates to the BPF (Berkeley Packet Filter) functionality specifically in arm64 architecture. This issue arises when BPF_TRAMP_F_CALL_ORIG is enabled, leading to a potential heap buffer overflow. The flaw occurs during the size calculation phase where a bpf_tramp_image struct’s stack address is incorrectly passed, causing the emitted instructions to exceed the expected size. The vulnerability can also be triggered when certain conditions related to stack addresses occur, further amplifying the risk of data corruption and system instability. A fix is implemented by ensuring the size calculation assumes the worst case, which mitigates the risk of erroneous code generation.

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