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b=ucJfpE/ZJn/j0gGv+xQ+IgHItN6gv1pCtnQfHuPpCky4a48FxZaWiEv43VNhut09WPR+vv +VC7qYqy4+SuC+Dg== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 30E651339F; Tue, 10 Nov 2026 12:49:32 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id nVRPAdwS82rDPAAAD6G6ig (envelope-from ); Tue, 10 Nov 2026 12:49:32 +0000 Message-ID: Date: Tue, 10 Nov 2026 13:49:31 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] nvmet-auth: reject incomplete DHCHAP messages To: =?UTF-8?B?SsOpcsOpbXkgSmVhbg==?= Cc: Christoph Hellwig , Sagi Grimberg , Chaitanya Kulkarni , linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20261102132419.2306396-2-Jeremy.Jean@oss.cyber.gouv.fr> Content-Language: en-US From: Hannes Reinecke In-Reply-To: <20261102132419.2306396-2-Jeremy.Jean@oss.cyber.gouv.fr> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-13.50 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; XM_UA_NO_VERSION(0.01)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_TLS_ALL(0.00)[]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; MID_RHS_MATCH_FROM(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_SEVEN(0.00)[7]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.de:email,suse.de:dkim,cyber.gouv.fr:email]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -13.50 X-Spam-Level: X-Rspamd-Queue-Id: 6689921EB8 On 11/2/26 2:24 PM, Jérémy Jean wrote: > Commit c9359401036e ("nvmet-auth: reject undersized AUTH_SEND > payloads") only ensures that AUTH_SEND has auth_type and auth_id > before nvmet_execute_auth_send() starts parsing the payload, but the > DHCHAP path reads t_id before it verifies message lengths. A two-byte > DHCHAP NEGOTIATE payload can therefore still trigger an OOB read that > KASAN reports as: > > BUG: KASAN: slab-out-of-bounds in nvmet_execute_auth_send > Read of size 2 at addr ffff8880030d8364 > > Require the payload to cover the minimum DHCHAP message length > before parsing it. > > Fixes: c9359401036e ("nvmet-auth: reject undersized AUTH_SEND payloads") > Cc: stable@vger.kernel.org > Signed-off-by: Jérémy Jean > --- > > Changes in v2: > - Check the minimum DHCHAP message length. > > v1 (2026-08-11 18:03:35 +0000): https://lore.kernel.org/all/20260811180335.4161138-2-Jeremy.Jean@oss.cyber.gouv.fr/ > > drivers/nvme/target/fabrics-cmd-auth.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/nvme/target/fabrics-cmd-auth.c b/drivers/nvme/target/fabrics-cmd-auth.c > index 70136f6c22e8..a15f21fc41e4 100644 > --- a/drivers/nvme/target/fabrics-cmd-auth.c > +++ b/drivers/nvme/target/fabrics-cmd-auth.c > @@ -301,7 +301,7 @@ void nvmet_execute_auth_send(struct nvmet_req *req) > nvmet_check_transfer_len(req, tl); > return; > } > - if (tl < offsetof(struct nvmf_auth_dhchap_success2_data, rsvd1)) { > + if (tl < sizeof(struct nvmf_auth_dhchap_failure_data)) { > status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR; > req->error_loc = > offsetof(struct nvmf_auth_send_command, tl); > Reviewed=by: Hannes Reinecke Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich