nvmet-auth: zero the AUTH_RECEIVE response buffer

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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.

Fixes: db1312dd95 ("nvmet: implement basic In-Band Authentication")
Cc: stable@vger.kernel.org
Signed-off-by: Bryam Vargas <hexlabsecurity@proton.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

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Bryam Vargas 2026-07-02 03:45:14 -05:00 • committed by Keith Busch

parent 3a6d89836a

commit 3ddcfb0133

1 changed files with 1 additions and 1 deletions

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drivers/nvme/target/fabrics-cmd-auth.c

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