drbd: reject data replies with an out-of-range payload size

Overview

In the Linux kernel, the following vulnerability has been resolved:

drbd: reject data replies with an out-of-range payload size

recv_dless_read() receives a P_DATA_REPLY from a peer into the bio of an outstanding read request. The peer-supplied payload length reaches it as the signed int data_size, and two peer-controlled inputs can make it negative. With a negotiated data-integrity-alg the digest length is subtracted first, so a reply whose payload is smaller than the digest underflows data_size. With no integrity algorithm (the default) data_size is assigned from the unsigned h95/h100 wire length and drbdd() never bounds it for a payload-carrying command, so a length above INT_MAX casts it negative; this path needs no non-default feature. The bio receive loop then computes expect = min_t(int, data_size, bv_len), which is negative, and drbd_recv_all_warn(mapped, expect) receives with a size_t of SIZE_MAX into the first mapped page.

The sibling receive path read_in_block() is not affected: it uses an unsigned size and rejects it against DRBD_MAX_BIO_SIZE before receiving. Reject a data reply whose size is negative after the optional digest subtraction, covering both triggers.

Impact: a malicious or man-in-the-middle DRBD peer copies attacker-chosen bytes past a bio page in the receiver, corrupting kernel memory. A node that reads from its peer (a diskless node, or read-balancing to the peer) is exposed in the default configuration; data-integrity-alg is not required.

Affected

• Linux >= b411b3637fa71fce9cf2acf0639009500f5892fe < bca33f5442c3094511719d9db792ce3165d87e76
• Linux >= b411b3637fa71fce9cf2acf0639009500f5892fe < 741a682535deffe9ab7e5c89caf83571efbc9dd9
• Linux >= b411b3637fa71fce9cf2acf0639009500f5892fe < f14e87d7b166490bceb9603b39310e51595d05b9
• Linux >= b411b3637fa71fce9cf2acf0639009500f5892fe < f16866c62656865854106b79bcf6e4ca97a51a92
• Linux >= b411b3637fa71fce9cf2acf0639009500f5892fe < 5f59a8142000f0b8f75c432209ead73c424a745d
• Linux >= b411b3637fa71fce9cf2acf0639009500f5892fe < 38cc4867540ae8beedfe41a1a1a6ed37052c77d6
• Linux >= b411b3637fa71fce9cf2acf0639009500f5892fe < 648d4317326e6aa3f8c05cbf0fd14cc2eba6ca99
• Linux >= b411b3637fa71fce9cf2acf0639009500f5892fe < bd910a7660d280595ef94cb6d193951d855d330f
• Linux 2.6.33

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.