Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: Guard stack limits against 32bit overflow This patch promotes the arithmetic around checking stack bounds to be done in the 64-bit domain, instead of the current 32bit. The arithmetic implies adding together a 64-bit register with a int offset. The register was checked to be below 1<<29 when it was variable, but not when it was fixed. The offset either comes from an instruction (in which case it is 16 bit), from another register (in which case the caller checked it to be below 1<<29 [1]), or from the size of an argument to a kfunc (in which case it can be a u32 [2]). Between the register being inconsistently checked to be below 1<<29, and the offset being up to an u32, it appears that we were open to overflowing the `int`s which were currently used for arithmetic. [1] https://github.com/torvalds/linux/blob/815fb87b753055df2d9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L7494-L7498 [2] https://github.com/torvalds/linux/blob/815fb87b753055df2d9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L11904
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f3c4b01689d392373301e6e60d1b02c5b4020afc before ad1754f86a87fe74912fb542b23ff24ada4e3307; affected 01f810ace9ed37255f27608a0864abebccf0aab3 before 4ba97610399e83d29d1086a0827d33172539b49b; affected 01f810ace9ed37255f27608a0864abebccf0aab3 before e160b2ed94a20fa940369ebd914277f88005e70d; affected 01f810ace9ed37255f27608a0864abebccf0aab3 before ad140fc856f0b1d5e2215bcb6d0cc247a86805a2; affected 01f810ace9ed37255f27608a0864abebccf0aab3 before e5ad9ecb84405637df82732ee02ad741a5f782a6; affected 01f810ace9ed37255f27608a0864abebccf0aab3 before 1d38a9ee81570c4bd61f557832dead4d6f816760; affected d1b725ea5d104caea250427899f4e2e3ab15b4fc; affected 5.10.33 before 5.10.270; affected 5.11.17 before 5.12 |
| Linux / Linux | affected 5.12; unaffected 0 before 5.12; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.14 through 6.6.*; unaffected 6.7.2 through 6.7.*; unaffected 6.8 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ad1754f86a87fe74912fb542b23ff24ada4e3307
- https://git.kernel.org/stable/c/4ba97610399e83d29d1086a0827d33172539b49b
- https://git.kernel.org/stable/c/e160b2ed94a20fa940369ebd914277f88005e70d
- https://git.kernel.org/stable/c/ad140fc856f0b1d5e2215bcb6d0cc247a86805a2
- https://git.kernel.org/stable/c/e5ad9ecb84405637df82732ee02ad741a5f782a6
- https://git.kernel.org/stable/c/1d38a9ee81570c4bd61f557832dead4d6f816760
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.