Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ae03b6b1c880a03d4771257336dc3bca156dd51b before 4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba; affected f92a819b4cbef8c9527d9797110544b2055a4b96 before 0e2dfdc74a7f4036127356d42ea59388f153f42c; affected 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 before 53e0db429b37a32b8fc706d0d90eb4583ad13848; affected 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 before 2cfa537674cd1051a3b8111536d77d0558f33d5d; affected 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 before 6eba92a4d4be8feb4dc33976abac544fa99d6ecc; affected 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 before 7cf64d8679ca1cb20cf57d6a88bfee79a0922a66; affected 979d63d50c0c0f7bc537bf821e056cc9fe5abd38 before b9b34ddbe2076ade359cd5ce7537d5ed019e9807; affected 078da99d449f64ca04d459cdbdcce513b64173cd; affected 4.14.113 before 4.14.233; affected 4.19.19 before 4.19.190; affected 4.20.6 before 4.21 |
| Linux / Linux | affected 5.0; unaffected 0 before 5.0; unaffected 4.14.233 through 4.14.*; unaffected 4.19.190 through 4.19.*; unaffected 5.4.117 through 5.4.*; unaffected 5.10.35 through 5.10.*; unaffected 5.11.19 through 5.11.*; unaffected 5.12.2 through 5.12.*; unaffected 5.13 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.
- 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