CVE-2024-47703
bpf, lsm: Add check for BPF LSM return value
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bpf, lsm: Add check for BPF LSM return value
In the Linux kernel, the following vulnerability has been resolved: bpf, lsm: Add check for BPF LSM return value A bpf prog returning a positive number attached to file_alloc_security hook makes kernel panic. This happens because file system can not filter out the positive number returned by the LSM prog using IS_ERR, and misinterprets this positive number as a file pointer. Given that hook file_alloc_security never returned positive number before the introduction of BPF LSM, and other BPF LSM hooks may encounter similar issues, this patch adds LSM return value check in verifier, to ensure no unexpected value is returned.
Reserved 2024-09-30 | Published 2024-10-21 | Updated 2024-12-19 | Assigner Linuxgit.kernel.org/...c/1050727d83e70449991c29dd1cf29fe936a63da3
git.kernel.org/...c/27ca3e20fe80be85a92b10064dfeb56cb2564b1c
git.kernel.org/...c/5d99e198be279045e6ecefe220f5c52f8ce9bfd5
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