CVE-2024-56720

In the Linux kernel, the following vulnerability has been resolved:

bpf, sockmap: Several fixes to bpf_msg_pop_data

Several fixes to bpf_msg_pop_data,

1. In sk_msg_shift_left, we should put_page
2. if (len == 0), return early is better
3. pop the entire sk_msg (last == msg->sg.size) should be supported
4. Fix for the value of variable a
5. In sk_msg_shift_left, after shifting, i has already pointed to the next element. Addtional sk_msg_iter_var_next may result in BUG.

Affected Software

References

• https://git.kernel.org/stable/c/275a9f3ef8fabb0cb282a62b9e164dedba7284c5
• https://git.kernel.org/stable/c/5d609ba262475db450ba69b8e8a557bd768ac07a
• https://git.kernel.org/stable/c/785180bed9879680d8e5c5e1b54c8ae8d948f4c8
• https://git.kernel.org/stable/c/98c7ea7d11f2588e8197db042e0291e4ac8f8346
• https://git.kernel.org/stable/c/d26d977633d1d0b8bf9407278189bd0a8d973323
• https://git.kernel.org/stable/c/d3f5763b3062514a234114e97bbde74d8d702449
• https://git.kernel.org/stable/c/e1f54c61c4c9a5244eb8159dce60d248f7d97b32
• https://git.kernel.org/stable/c/f58d3aa457e77a3d9b3df2ab081dcf9950f6029f