Description
In the Linux kernel, the following vulnerability has been resolved: bpf, test_run: Subtract size of xdp_frame from allowed metadata size The xdp_frame structure takes up part of the XDP frame headroom, limiting the size of the metadata. However, in bpf_test_run, we don't take this into account, which makes it possible for userspace to supply a metadata size that is too large (taking up the entire headroom). If userspace supplies such a large metadata size in live packet mode, the xdp_update_frame_from_buff() call in xdp_test_run_init_page() call will fail, after which packet transmission proceeds with an uninitialised frame structure, leading to the usual Bad Stuff. The commit in the Fixes tag fixed a related bug where the second check in xdp_update_frame_from_buff() could fail, but did not add any additional constraints on the metadata size. Complete the fix by adding an additional check on the metadata size. Reorder the checks slightly to make the logic clearer and add a comment.
Product status
b6f1f780b3932ae497ed85e79bc8a1e513883624 (git) before e7440935063949d6f2c10f7328d960d0ff4bce90
b6f1f780b3932ae497ed85e79bc8a1e513883624 (git) before 7c81ad5e580bd8441f8a521a8d34824ce6582ae5
b6f1f780b3932ae497ed85e79bc8a1e513883624 (git) before 6447e697cfa8a43a8e491cb81bcc390d0f28f8ba
b6f1f780b3932ae497ed85e79bc8a1e513883624 (git) before 31e37f44b60679d90b9f999c91371b15291be8e0
b6f1f780b3932ae497ed85e79bc8a1e513883624 (git) before e558cca217790286e799a8baacd1610bda31b261
5.18
Any version before 5.18
6.1.161 (semver)
6.6.121 (semver)
6.12.66 (semver)
6.18.6 (semver)
6.19 (original_commit_for_fix)
References
git.kernel.org/...c/e7440935063949d6f2c10f7328d960d0ff4bce90
git.kernel.org/...c/7c81ad5e580bd8441f8a521a8d34824ce6582ae5
git.kernel.org/...c/6447e697cfa8a43a8e491cb81bcc390d0f28f8ba
git.kernel.org/...c/31e37f44b60679d90b9f999c91371b15291be8e0
git.kernel.org/...c/e558cca217790286e799a8baacd1610bda31b261