Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix masking negation logic upon negative dst register The negation logic for the case where the off_reg is sitting in the dst register is not correct given then we cannot just invert the add to a sub or vice versa. As a fix, perform the final bitwise and-op unconditionally into AX from the off_reg, then move the pointer from the src to dst and finally use AX as the source for the original pointer arithmetic operation such that the inversion yields a correct result. The single non-AX mov in between is possible given constant blinding is retaining it as it's not an immediate based operation.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
ae03b6b1c880a03d4771257336dc3bca156dd51b to < 4d542ddb88fb2f39bf7f14caa2902f3e8d06f6baaffectedf92a819b4cbef8c9527d9797110544b2055a4b96 to < 0e2dfdc74a7f4036127356d42ea59388f153f42caffected979d63d50c0c0f7bc537bf821e056cc9fe5abd38 to < 53e0db429b37a32b8fc706d0d90eb4583ad13848affected979d63d50c0c0f7bc537bf821e056cc9fe5abd38 to < 2cfa537674cd1051a3b8111536d77d0558f33d5daffected979d63d50c0c0f7bc537bf821e056cc9fe5abd38 to < 6eba92a4d4be8feb4dc33976abac544fa99d6eccaffected979d63d50c0c0f7bc537bf821e056cc9fe5abd38 to < 7cf64d8679ca1cb20cf57d6a88bfee79a0922a66affected979d63d50c0c0f7bc537bf821e056cc9fe5abd38 to < b9b34ddbe2076ade359cd5ce7537d5ed019e9807affected078da99d449f64ca04d459cdbdcce513b64173cdaffected4.14.113 to < 4.14.233affected4.19.19 to < 4.19.190affected4.20.6 to < 4.21affected
Linux Linux
Default version status: affected
5.0affected0 to < 5.0unaffected4.14.233 to ≤ 4.14.*unaffected4.19.190 to ≤ 4.19.*unaffected5.4.117 to ≤ 5.4.*unaffected5.10.35 to ≤ 5.10.*unaffected5.11.19 to ≤ 5.11.*unaffected5.12.2 to ≤ 5.12.*unaffected5.13 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba ↗
- https://git.kernel.org/stable/c/0e2dfdc74a7f4036127356d42ea59388f153f42c ↗
- https://git.kernel.org/stable/c/53e0db429b37a32b8fc706d0d90eb4583ad13848 ↗
- https://git.kernel.org/stable/c/2cfa537674cd1051a3b8111536d77d0558f33d5d ↗
- https://git.kernel.org/stable/c/6eba92a4d4be8feb4dc33976abac544fa99d6ecc ↗
- https://git.kernel.org/stable/c/7cf64d8679ca1cb20cf57d6a88bfee79a0922a66 ↗
- https://git.kernel.org/stable/c/b9b34ddbe2076ade359cd5ce7537d5ed019e9807 ↗