CVE ID:	CVE-2023-52676
Description:	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/b lob/815fb87b753055df2d9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L74 94-L7498 [2] https://github.com/torvalds/linux/blob/815fb87b753055df2d 9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L11904
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2023-52676 https://git.kernel.org/stable/c/1d38a9ee81570c4bd61f557832dead4d6f816760 https://git.kernel.org/stable/c/1d38a9ee81570c4bd61f557832dead4d6f816760 https://git.kernel.org/stable/c/ad140fc856f0b1d5e2215bcb6d0cc247a86805a2 https://git.kernel.org/stable/c/ad140fc856f0b1d5e2215bcb6d0cc247a86805a2 https://git.kernel.org/stable/c/e5ad9ecb84405637df82732ee02ad741a5f782a6 https://git.kernel.org/stable/c/e5ad9ecb84405637df82732ee02ad741a5f782a6