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Wed, 23 Sep 2026 18:29:29 +0000 (GMT) Received: from li-fc74f8cc-3279-11b2-a85c-ef5828687581.ibm.com (unknown [9.67.83.254]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 23 Sep 2026 18:29:29 +0000 (GMT) From: Srish Srinivasan To: linuxppc-dev@lists.ozlabs.org Cc: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, nayna@linux.ibm.com, gjoyce@linux.ibm.com, ritesh.list@gmail.com, sshegde@linux.ibm.com, linux-kernel@vger.kernel.org, rnsastry@linux.ibm.com, ssrish@linux.ibm.com, stable@vger.kernel.org Subject: [PATCH 06/12] pseries/plpks: clear signed update authentication buffer Date: Wed, 23 Sep 2026 23:58:10 +0530 Message-ID: <20260923182816.151451-7-ssrish@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260923182816.151451-1-ssrish@linux.ibm.com> References: <20260923182816.151451-1-ssrish@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: pTlMW5FpqqNPDc4iJtWWC8fLY4K1NgxW X-Authority-Analysis: v=2.4 cv=I43w19gg c=1 sm=1 tr=0 ts=6ab41a94 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=aIiXfJ5NXcxv1dgaZq0A:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIzMDA3MiBTYWx0ZWRfXwK3vRJxSY8s6 tS7kovMHYKcbB6+mM/XJ4ImhJWfROy2jPJfhCnLKHz7ztWgKh0d5I7PPeH/dPnY8OkHUsVigELL fLylOzd5VxNGykw1w86aI9IjnJ8ukTkjxjD0TW5P6Y+KM5OojB7xTrRYYpXKaGWU52WWgo2y8Rg ktFIbcLOx2NsLxhc29VZjjHONmZeszCS5F0ju5PIp6M1Oc7OISe8FrVcKOODZlWPraKXPdT3E9A oRMi/S+H7YrTDHZH3FFx7LHinV3CRodEA8cKEqmAjVqNVWotZg5Y0gwXZOBCEBUjJm9ugf3zdFR V8KuS/8t0W+6XM55KIrfFG7guhBUtirrhPgO+kHv+0SY5cb4PkXXQRAWPgtLmMVoDwTOhTGcvWw ijy7UlhR2r/mx63IU0x+LJW03vxJ0DnNyZv3NBp0OmgwjGL6hxGI0oSm97OTMfID4DdFAvyJsxl Tlq8f572oL1j8TWBWdA== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTIzMDA3MiBTYWx0ZWRfX3OJ01FwRDBKP GMiZYvVlO4vdGkPZox+k1U1WWNZXfHeFkh8LZ06VsTKzxLrJPBwd0VD9F4L0uok8JjEP0Rk5Fld TlgpKadrq4EAL+oryhe0VYLiX2OaWHs= X-Proofpoint-GUID: HBBs54GYQynKQnWX-v275IboKyKe_sLO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-23_06,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 adultscore=0 suspectscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609230072 The PLPKS signed update operation uses an authentication buffer that contains a password. Freeing this buffer with kfree(), without wiping the contents, can leave sensitive data in memory. Use kfree_sensitive() to wipe the buffer when freeing it. Fixes: 899d9b8fee66 ("powerpc/pseries: Implement signed update for PLPKS objects") Cc: stable@vger.kernel.org # 6.3 Signed-off-by: Srish Srinivasan Reviewed-by: Nayna Jain Tested-by: R Nageswara Sastry --- arch/powerpc/platforms/pseries/plpks.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/pseries/plpks.c b/arch/powerpc/platforms/pseries/plpks.c index 17a73a04d45b..b057e378a6b3 100644 --- a/arch/powerpc/platforms/pseries/plpks.c +++ b/arch/powerpc/platforms/pseries/plpks.c @@ -685,7 +685,7 @@ int plpks_signed_update_var(struct plpks_var *var, u64 flags) kfree(label); out: - kfree(auth); + kfree_sensitive(auth); return rc; } -- 2.52.0