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CVE-2023-44466: libceph: harden msgr2.1 frame segment length checks · torvalds/linux@a282a2f
An issue was discovered in net/ceph/messenger_v2.c in the Linux kernel before 6.4.5. There is an integer signedness error, leading to a buffer overflow and remote code execution via HELLO or one of the AUTH frames. This occurs because of an untrusted length taken from a TCP packet in ceph_decode_32.
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libceph: harden msgr2.1 frame segment length checks
ceph_frame_desc::fd_lens is an int array. decode_preamble() thus effectively casts u32 -> int but the checks for segment lengths are written as if on unsigned values. While reading in HELLO or one of the AUTH frames (before authentication is completed), arithmetic in head_onwire_len() can get duped by negative ctrl_len and produce head_len which is less than CEPH_PREAMBLE_LEN but still positive. This would lead to a buffer overrun in prepare_read_control() as the preamble gets copied to the newly allocated buffer of size head_len.
Cc: [email protected] Fixes: cd1a677 ("libceph, ceph: implement msgr2.1 protocol (crc and secure modes)") Reported-by: Thelford Williams [email protected] Signed-off-by: Ilya Dryomov [email protected] Reviewed-by: Xiubo Li [email protected]
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