CVE-2024-42161
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD [Changes from V1: - Use a default branch in the switch statement to initialize `val'.] GCC warns that `val' may be used uninitialized in the BPF_CRE_READ_BITFIELD macro, defined in bpf_core_read.h as: [...] unsigned long long val; \ [...] \ switch (__CORE_RELO(s, field, BYTE_SIZE)) { \ case 1: val = *(const unsigned char *)p; break; \ case 2: val = *(const unsigned short *)p; break; \ case 4: val = *(const unsigned int *)p; break; \ case 8: val = *(const unsigned long long *)p; break; \ } \ [...] val; \ } \ This patch adds a default entry in the switch statement that sets `val' to zero in order to avoid the warning, and random values to be used in case __builtin_preserve_field_info returns unexpected values for BPF_FIELD_BYTE_SIZE. Tested in bpf-next master. No regressions.
How to fix
- linux linux_kernel5.10.222, 5.15.163, 6.1.98, 6.6.39, 6.9.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 5.10.222, 5.11 ≤ v < 5.15.163, 5.16 ≤ v < 6.1.98, 6.2 ≤ v < 6.6.39, 6.7 ≤ v < 6.9.9 | 5.10.222, 5.15.163, 6.1.98, 6.6.39, 6.9.9 |
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