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Tue, 10 Nov 2026 12:14:46 +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 HuGhAbYK82onGQAAD6G6ig (envelope-from ); Tue, 10 Nov 2026 12:14:46 +0000 Message-ID: <4ff74c54-7478-4ea5-9e26-32101acd4556@suse.de> Date: Tue, 10 Nov 2026 13:14:45 +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] nvmet: synchronize DH-CHAP secret removal To: Sreeraj S Kurup , hare@kernel.org, hch@lst.de, kbusch@kernel.org, kch@nvidia.com, sagi@grimberg.me Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org References: <20261110075733.2578-1-sreekuttan2156239@gmail.com> Content-Language: en-US From: Hannes Reinecke In-Reply-To: <20261110075733.2578-1-sreekuttan2156239@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Level: X-Spamd-Result: default: False [-13.29 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; XM_UA_NO_VERSION(0.01)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; FREEMAIL_TO(0.00)[gmail.com,kernel.org,lst.de,nvidia.com,grimberg.me]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_SEVEN(0.00)[8]; FROM_HAS_DN(0.00)[]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_DN_SOME(0.00)[] X-Spam-Score: -13.29 On 11/10/26 8:57 AM, Sreeraj S Kurup wrote: > The empty-secret path in nvmet_auth_set_key() modifies and frees > host authentication secrets without holding nvmet_config_sem. > > nvmet_setup_auth() accesses these fields under the read lock, > allowing concurrent secret removal to cause a use-after-free. > > Acquire nvmet_config_sem for writing while clearing the secrets > to synchronize with authentication setup. > > Signed-off-by: Sreeraj S Kurup > --- > drivers/nvme/target/auth.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/nvme/target/auth.c b/drivers/nvme/target/auth.c > index ccba84b1344e..8fe521690ccd 100644 > --- a/drivers/nvme/target/auth.c > +++ b/drivers/nvme/target/auth.c > @@ -26,6 +26,7 @@ int nvmet_auth_set_key(struct nvmet_host *host, const char *secret, > char *dhchap_secret; > > if (!strlen(secret)) { > + down_write(&nvmet_config_sem); > if (set_ctrl) { > kfree(host->dhchap_ctrl_secret); > host->dhchap_ctrl_secret = NULL; > @@ -35,6 +36,7 @@ int nvmet_auth_set_key(struct nvmet_host *host, const char *secret, > host->dhchap_secret = NULL; > host->dhchap_key_hash = 0; > } > + up_write(&nvmet_config_sem); > return 0; > } > if (sscanf(secret, "DHHC-1:%hhd:%*s", &key_hash) != 1) 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