cve-2024-49850
Vulnerability from cvelistv5
Published
2024-10-21 12:18
Modified
2024-12-19 09:27
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218Patch
Impacted products
Vendor Product Version
Linux Linux Version: 74753e1462e77349525daf9eb60ea21ed92d3a97
Version: 74753e1462e77349525daf9eb60ea21ed92d3a97
Version: 74753e1462e77349525daf9eb60ea21ed92d3a97
Version: 74753e1462e77349525daf9eb60ea21ed92d3a97
Version: 74753e1462e77349525daf9eb60ea21ed92d3a97
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   Linux Linux Version: 5.17
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