nvmet-auth: zero the AUTH_RECEIVE response buffer

Overview

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

nvmet-auth: zero the AUTH_RECEIVE response buffer

nvmet_execute_auth_receive() allocates the response buffer with kmalloc() sized by the host-supplied AUTH_RECEIVE allocation length, but the DH-HMAC-CHAP builders write only a fixed-size message into it. The full allocation length is then copied to the wire by nvmet_copy_to_sgl(), so a remote initiator receives the bytes past the built message -- up to nearly a page of uninitialized slab -- during the pre-authentication handshake.

Allocate the buffer with kzalloc() so the unwritten tail is zeroed before it is sent; conforming responses are unaffected.

Affected

• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 447b668faa14710f611e714031e3739ac3ec3a4f
• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 8f6363c8d54dde95982f0ab45e77cf57ec0efd62
• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < dfcf013f77709ebdb282767edc2795a37cab5b57
• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < b26189d28442183a8b5edb754f4a6918f77ca84e
• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 2dcc9226203da7275a9c29d20007da278d73d5e9
• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 1d6837d98bf966a041af65de5f78de7409ff83bc
• Linux >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 3ddcfb013322aa37eaa7a0d344b73079c38dfa21
• Linux 6.0

Remediation

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