CVE-2024-49850
bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos
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bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos
In the Linux kernel, the following vulnerability has been resolved: bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos In case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCAL referencing a non-existing BTF type, function bpf_core_calc_relo_insn would cause a null pointer deference. Fix this by adding a proper check upper in call stack, as malformed relocation records could be passed from user space. Simplest reproducer is a program: r0 = 0 exit With a single relocation record: .insn_off = 0, /* patch first instruction */ .type_id = 100500, /* this type id does not exist */ .access_str_off = 6, /* offset of string "0" */ .kind = BPF_CORE_TYPE_ID_LOCAL, See the link for original reproducer or next commit for a test case.
Reserved 2024-10-21 | Published 2024-10-21 | Updated 2024-12-19 | Assigner Linuxgit.kernel.org/...c/dc7ce14f00bcd50641f2110b7a32aa6552e0780f
git.kernel.org/...c/2288b54b96dcb55bedebcef3572bb8821fc5e708
git.kernel.org/...c/584cd3ff792e1edbea20b2a7df55897159b0be3e
git.kernel.org/...c/e7e9c5b2dda29067332df2a85b0141a92b41f218
git.kernel.org/...c/3d2786d65aaa954ebd3fcc033ada433e10da21c4
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